Between brackets is the number of accepted species
Click on "-" to collapse/hide all child taxa
Shows the number of accepted species within the taxon
The last expanded taxon is highlighted
Click on "+" to expand/show all child taxa
Click to see the taxon details page
- Mollusca (132 851)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 013)
- Class Caudofoveata (143)
- Class Cephalopoda (1 834)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 753)
- Subclass Amphigastropoda † (396)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 670)
- Subclass Gastropoda incertae sedis (308)
- Subclass Heterobranchia (39 172)
- Infraclass "Lower Heterobranchia" (1 137)
- Infraclass Euthyneura (37 449)
- Subterclass Acteonimorpha (411)
- Subterclass Ringipleura (2 917)
- Subterclass Tectipleura (34 121)
- Superorder Acochlidiimorpha (48)
- Superorder Ascoglossa accepted as Sacoglossa
- Superorder Basommatophora accepted as Hygrophila
- Superorder Eupulmonata (25 585)
- Order Aillyida accepted as Achatinina
- Order Ellobiida (579)
- Order Gymnomorpha accepted as Systellommatophora
- Order Stylommatophora (24 782)
- Suborder Achatinina (2 912)
- Suborder Elasmognatha accepted as Succineoidei
- Suborder Helicina (21 630)
- Infraorder Arionoidei (140)
- Infraorder Clausilioidei (1 859)
- Infraorder Helicina incertae sedis (3 210)
- Infraorder Helicoidei (5 691)
- Superfamily Helicoidea Rafinesque, 1815 (5 491)
- Family Ariantidae Mörch, 1864 accepted as Ariantinae Mörch, 1864
- Family Bradybaenidae Pilsbry, 1934 (1898) accepted as Camaenidae Pilsbry, 1895
- Family Calyciidae Iredale, 1941 accepted as Hadrinae Iredale, 1937
- Family Camaenidae Pilsbry, 1895 (2 898)
- Family Canariellidae Schileyko, 1991 (56)
- Family Cepolidae Ihering, 1909 (102)
- Family Chloritidae Iredale, 1938 accepted as Hadrinae Iredale, 1937
- Family Cochlicellidae Schileyko, 1972 accepted as Cochlicellini Schileyko, 1972
- Family Cochlicellinae Schileyko, 1972 accepted as Cochlicellini Schileyko, 1972
- Family Cochlostylidae Möllendorff, 1890 accepted as Helicostylinae Ihering, 1909 (1890)
- Family Echinichidae F. G. Thompson & Naranjo-García, 2012 accepted as Echinichinae F. G. Thompson & Naranjo-García, 2012
- Family Elonidae E. Gittenberger, 1977 (63)
- Family Epiphragmophoridae Hoffmann, 1928 (72)
- Family Eulotidae Möllendorff, 1898 accepted as Bradybaenini Pilsbry, 1934 (1898)
- Family Geomitridae C. R. Boettger, 1909 (402)
- Family Helicellidae Ihering, 1909 accepted as Hygromiidae Tryon, 1866
- Family Helicidae Rafinesque, 1815 (500)
- Subfamily Ariantinae Mörch, 1864 (153)
- Subfamily Helicinae Rafinesque, 1815 (320)
- Tribe Allognathini Westerlund, 1903 (95)
- Tribe Ereminini D. T. Holyoak, G. A. Holyoak, Gómez-Moliner & Chueca, 2020 accepted as Thebini Wenz, 1923
- Tribe Helicini Rafinesque, 1815 (98)
- Genus Amanica H. Nordsieck, 2017 (1)
- Genus Aristena Psonis, Vardinoyannis & Poulakakis, 2022 (1)
- Genus Aristina Psonis, Vardinoyannis & Poulakakis, 2022 accepted as Aristena Psonis, Vardinoyannis & Poulakakis, 2022
- Genus Assyriella P. Hesse, 1909 accepted as Levantina Kobelt, 1871
- Genus Austrotachea Pfeffer, 1930 accepted as Caucasotachea C. R. Boettger, 1909
- Genus Callunea Scudder, 1882 accepted as Helix Linnaeus, 1758
- Genus Caucasotachea C. R. Boettger, 1909 (11)
- Genus Cochlea Da Costa, 1778 accepted as Helix Linnaeus, 1758
- Genus Codringtonia Kobelt, 1898 (6)
- Genus Coenatoria Held, 1838 accepted as Helix Linnaeus, 1758
- Genus Glischrus S. Studer, 1820 accepted as Helix Linnaeus, 1758
- Genus Helicites W. Martin, 1809 † accepted as Helix Linnaeus, 1758
- Genus Helicogena A. Férussac, 1821 accepted as Helix Linnaeus, 1758
- Genus Helix Linnaeus, 1758 (46)
- Subgenus Helix (Acanthinula) H. Beck, 1847 accepted as Acanthinula H. Beck, 1847
- Subgenus Helix (Acavus) Montfort, 1810 accepted as Acavus Montfort, 1810
- Subgenus Helix (Actinella) R. T. Lowe, 1852 accepted as Actinella R. T. Lowe, 1852
- Subgenus Helix (Aculeatiana) Caziot, 1910 accepted as Acanthinula H. Beck, 1847
- Subgenus Helix (Acusta) E. von Martens, 1860 accepted as Acusta E. von Martens, 1860
- Subgenus Helix (Aegaeohelix) Korábek & Hausdorf, 2023 represented as Helix Linnaeus, 1758
- Subgenus Helix (Aegista) Albers, 1850 accepted as Aegista Albers, 1850
- Subgenus Helix (Aerope) E. von Martens, 1890 accepted as Natalina Pilsbry, 1893
- Subgenus Helix (Agalma) Albers, 1860 accepted as Agalma Albers, 1860
- Subgenus Helix (Aglaja) Albers, 1850 accepted as Lysinoe H. Adams & A. Adams, 1855
- Subgenus Helix (Alabastrina) Kobelt, 1904 accepted as Loxana Pallary, 1899
- Subgenus Helix (Allognathus) Pilsbry, 1888 accepted as Allognathus Pilsbry, 1888
- Subgenus Helix (Allolaemus) Pilsbry, 1895 † accepted as Campylaea (Allolaemus) Pilsbry, 1895 †
- Subgenus Helix (Amandana) Fagot, 1891 accepted as Xerocrassa (Amandana) Fagot, 1891
- Subgenus Helix (Ammonoceras) L. Pfeiffer, 1855 accepted as Ammonoceras L. Pfeiffer, 1855
- Subgenus Helix (Ampelita) H. Beck, 1837 accepted as Ampelita H. Beck, 1837
- Subgenus Helix (Amphidoxa) Albers, 1850 accepted as Amphidoxa Albers, 1850
- Subgenus Helix (Angrandiella) Ancey, 1886 accepted as Epiphragmophora (Angrandiella) Ancey, 1886
- Subgenus Helix (Anguispira) E. S. Morse, 1864 accepted as Anguispira E. S. Morse, 1864
- Subgenus Helix (Archelix) Albers, 1850 accepted as Otala Schumacher, 1817
- Subgenus Helix (Arianta) W. Turton, 1831 accepted as Arianta W. Turton, 1831
- Subgenus Helix (Arionta) E. von Martens, 1860 accepted as Arianta W. Turton, 1831
- Subgenus Helix (Ariophanta) Des Moulins, 1829 accepted as Ariophanta Des Moulins, 1829
- Subgenus Helix (Armandia) Ancey, 1883 accepted as Armandiella Ancey, 1901
- Subgenus Helix (Aspasita) Westerlund, 1889 accepted as Aspasita Westerlund, 1889
- Subgenus Helix (Atlasica) Pallary, 1917 accepted as Loxana Pallary, 1899
- Subgenus Helix (Atopa) Albers, 1850 accepted as Corilla H. Adams & A. Adams, 1855
- Subgenus Helix (Aulacospira) Möllendorff, 1890 accepted as Aulacospira Möllendorff, 1890
- Subgenus Helix (Averellia) Ancey, 1887 accepted as Averellia Ancey, 1887
- Subgenus Helix (Axina) Albers, 1850 accepted as Anixa Pilsbry, 1895
- Subgenus Helix (Bradybaena) H. Beck, 1837 accepted as Bradybaena H. Beck, 1837
- Subgenus Helix (Brazieria) Ancey, 1887 accepted as Brazieria Ancey, 1887
- Subgenus Helix (Buliminopsis) Heude, 1890 accepted as Buliminopsis Heude, 1890
- Subgenus Helix (Bulimulus) Leach, 1814 accepted as Bulimulus Leach, 1814
- Subgenus Helix (Bulimus) Bruguière, 1789 accepted as Bulimus Bruguière, 1789
- Subgenus Helix (Caelatiana) Caziot, 1909 accepted as Trochulus Westerlund, 1886
- Subgenus Helix (Callicochlias) Agassiz, 1847 accepted as Calocochlea W. Hartmann, 1843
- Subgenus Helix (Callina) R. T. Lowe, 1855 accepted as Callina R. T. Lowe, 1855
- Subgenus Helix (Calocochlea) W. Hartmann, 1843 accepted as Calocochlea W. Hartmann, 1843
- Subgenus Helix (Camaena) Albers, 1850 accepted as Camaena Albers, 1850
- Subgenus Helix (Camaenopsis) Dollfus & Dautzenberg, 1924 † accepted as Camaenopsis Dollfus & Dautzenberg, 1924 †
- Subgenus Helix (Camena) E. von Martens, 1860 accepted as Camaena Albers, 1850
- Subgenus Helix (Campylaea) H. Beck, 1837 accepted as Campylaea H. Beck, 1837
- Subgenus Helix (Candidula) Kobelt, 1871 accepted as Candidula Kobelt, 1871
- Subgenus Helix (Cantabricana) Fagot, 1891 accepted as Pyrenaearia P. Hesse, 1921
- Subgenus Helix (Cantareus) Risso, 1826 accepted as Cantareus Risso, 1826
- Subgenus Helix (Caprinus) Montfort, 1810 accepted as Pleurodonte Fischer von Waldheim, 1807
- Subgenus Helix (Caracolina) H. Beck, 1837 accepted as Caracollina H. Beck, 1837
- Subgenus Helix (Caracolla) Albers, 1850 accepted as Caracolla Albers, 1850
- Subgenus Helix (Caracollina) H. Beck, 1837 accepted as Caracollina H. Beck, 1837
- Subgenus Helix (Caracolus) Montfort, 1810 accepted as Caracolus Montfort, 1810
- Subgenus Helix (Carascalensiana) Fagot, 1885 accepted as Pyrenaearia P. Hesse, 1921
- Subgenus Helix (Carocolla) accepted as Caracolus Montfort, 1810
- Subgenus Helix (Carthusiana) Kobelt, 1871 accepted as Monacha Fitzinger, 1833
- Subgenus Helix (Caseolus) R. T. Lowe, 1852 accepted as Caseolus R. T. Lowe, 1852
- Subgenus Helix (Cathaica) Möllendorff, 1884 accepted as Cathaica Möllendorff, 1884
- Subgenus Helix (Cemeneleana) Caziot, 1908 accepted as Monacha Fitzinger, 1833
- Subgenus Helix (Cepolis) Montfort, 1810 accepted as Cepolis Montfort, 1810
- Subgenus Helix (Charopa) E. von Martens, 1860 accepted as Charopa E. von Martens, 1860
- Subgenus Helix (Chilanodon) Westerlund, 1897 accepted as Chilanodon Westerlund, 1897
- Subgenus Helix (Chloraea) Albers, 1850 accepted as Chloraea Albers, 1850
- Subgenus Helix (Chloritis) H. Beck, 1837 accepted as Chloritis H. Beck, 1837
- Subgenus Helix (Ciliatana) Caziot, 1908 accepted as Ciliella Mousson, 1872
- Subgenus Helix (Ciliella) Mousson, 1872 accepted as Ciliella Mousson, 1872
- Subgenus Helix (Cinctelliana) Caziot, 1908 accepted as Hygromia Risso, 1826
- Subgenus Helix (Circinaria) Beck, 1837 accepted as Vallonia Risso, 1826
- Subgenus Helix (Clausilia) Draparnaud, 1805 accepted as Clausilia Draparnaud, 1805
- Subgenus Helix (Cochlicella) A. Férussac, 1821 accepted as Cochlicella A. Férussac, 1821
- Subgenus Helix (Cochlicelle) [sic] accepted as Cochlicella A. Férussac, 1821
- Subgenus Helix (Cochlichondra) Jan, 1830
- Subgenus Helix (Cochliclona) Jan, 1830 accepted as Rumina Risso, 1826
- Subgenus Helix (Cochlicopa) A. Férussac, 1821 accepted as Cochlicopa A. Férussac, 1821
- Subgenus Helix (Cochlitoma) A. Férussac, 1821 accepted as Cochlitoma A. Férussac, 1821
- Subgenus Helix (Cochlodina) A. Férussac, 1821 accepted as Cochlodina A. Férussac, 1821
- Subgenus Helix (Cochlodonta) A. Férussac, 1821 accepted as Cochlodonta A. Férussac, 1821
- Subgenus Helix (Cochlogena) A. Férussac, 1821 accepted as Bulimulus Leach, 1814
- Subgenus Helix (Cochlogibba) Jan, 1830
- Subgenus Helix (Cochlohydra) A. Férussac, 1821 accepted as Succinea Draparnaud, 1801
- Subgenus Helix (Cochlopupa) Jan, 1830 accepted as Cochlopupa Jan, 1830
- Subgenus Helix (Cochlostyla) A. Férussac, 1821 accepted as Helicostyla A. Férussac, 1821
- Subgenus Helix (Codringtonia) Kobelt, 1898 accepted as Codringtonia Kobelt, 1898
- Subgenus Helix (Coelospira) Ancey, 1886 accepted as Averellia Ancey, 1887
- Subgenus Helix (Coliolus) Tapparone Canefri, 1886 accepted as Coliolus Tapparone Canefri, 1886
- Subgenus Helix (Conulus) Fitzinger, 1833 accepted as Euconulus Reinhardt, 1883
- Subgenus Helix (Corasia) Albers, 1850 accepted as Chloraea Albers, 1850
- Subgenus Helix (Corilla) H. Adams & A. Adams, 1855 accepted as Corilla H. Adams & A. Adams, 1855
- Subgenus Helix (Cornu) Born, 1778 accepted as Cornu Born, 1778
- Subgenus Helix (Coronaria) R. T. Lowe, 1852 accepted as Geomitra Swainson, 1840
- Subgenus Helix (Coryda) Albers, 1850 accepted as Coryda Albers, 1850
- Subgenus Helix (Craspedaria) R. T. Lowe, 1852 accepted as Craspedaria R. T. Lowe, 1852
- Subgenus Helix (Crenea) Albers, 1850 accepted as Creneatachea Zilch, 1960 †
- Subgenus Helix (Cressa) Westerlund, 1889 accepted as Metafruticicola Ihering, 1892
- Subgenus Helix (Cressa) Westerlund, 1889 accepted as Metafruticicola Ihering, 1892
- Subgenus Helix (Cristigibba) Tapparone Canefri, 1883 accepted as Cristigibba Tapparone Canefri, 1883
- Subgenus Helix (Cryptaxis) R. T. Lowe, 1855 accepted as Leptaxis (Cryptaxis) R. T. Lowe, 1855
- Subgenus Helix (Cryptomphalus) Charpentier, 1837 accepted as Cornu Born, 1778
- Subgenus Helix (Crystallus) R. T. Lowe, 1855 accepted as Vitrea Fitzinger, 1833
- Subgenus Helix (Ctenoglypta) Ancey, 1904 accepted as Ctenoglypta Ancey, 1904
- Subgenus Helix (Ctenophila) Ancey, 1882 accepted as Ctenophila Ancey, 1882
- Subgenus Helix (Cunula) Pallary, 1936 accepted as Helix Linnaeus, 1758
- Subgenus Helix (Cymotropis) E. von Martens, 1860 accepted as Papuina E. von Martens, 1860
- Subgenus Helix (Cyrtochilus) F. Sandberger, 1875 † accepted as Cyrtochilus F. Sandberger, 1875 †
- Subgenus Helix (Daedalochila) H. Beck, 1837 accepted as Daedalochila H. Beck, 1837
- Subgenus Helix (Dentellaria) Schumacher, 1817 accepted as Dentellaria Schumacher, 1817
- Subgenus Helix (Dentellocaracolus) Oppenheim, 1890 † accepted as Dentellocaracolus Oppenheim, 1890 †
- Subgenus Helix (Dialeuca) Albers, 1850 accepted as Dialeuca Albers, 1850
- Subgenus Helix (Dimorphoptychia) F. Sandberger, 1871 † accepted as Dimorphoptychia F. Sandberger, 1871 †
- Subgenus Helix (Discula) R. T. Lowe, 1852 accepted as Discula R. T. Lowe, 1852
- Subgenus Helix (Discus) Albers, 1850 accepted as Videna H. Adams & A. Adams, 1855
- Subgenus Helix (Discus) Fitzinger, 1833 accepted as Discus Fitzinger, 1833
- Subgenus Helix (Dorcasia) J. E. Gray, 1838 accepted as Dorcasia J. E. Gray, 1838
- Subgenus Helix (Endodonta) Albers, 1850 accepted as Endodonta Albers, 1850
- Subgenus Helix (Epiphragmophora) Doering, 1875 accepted as Epiphragmophora Doering, 1875
- Subgenus Helix (Epistylia) Swainson, 1840 accepted as Sagda H. Beck, 1837
- Subgenus Helix (Eremina) L. Pfeiffer, 1855 accepted as Eremina L. Pfeiffer, 1855
- Subgenus Helix (Eremophila) Kobelt, 1871 accepted as Eremina L. Pfeiffer, 1855
- Subgenus Helix (Erepta) Albers, 1850 accepted as Erepta Albers, 1850
- Subgenus Helix (Erigone) Albers, 1850 accepted as Chloritis (Eustomopsis) Gude, 1906
- Subgenus Helix (Euacanthinula) Westerlund, 1889 accepted as Acanthinula H. Beck, 1847
- Subgenus Helix (Eucampylaea) Westerlund, 1876 accepted as Campylaea H. Beck, 1837
- Subgenus Helix (Euclasta) E. von Martens, 1877 accepted as Euclastaria Pilsbry, 1926
- Subgenus Helix (Eucochlias) G. Nevill, 1878 accepted as Eucochlias G. Nevill, 1878
- Subgenus Helix (Euhadra) Pilsbry, 1890 accepted as Euhadra Pilsbry, 1890
- Subgenus Helix (Eulota) W. Hartmann, 1841 accepted as Fruticicola Held, 1838
- Subgenus Helix (Eulotella) E. von Martens, 1891 accepted as Bradybaena H. Beck, 1837
- Subgenus Helix (Euomphalia) Westerlund, 1889 accepted as Euomphalia Westerlund, 1889
- Subgenus Helix (Euparypha) W. Hartmann, 1843 accepted as Theba Risso, 1826
- Subgenus Helix (Eurycampta) E. von Martens, 1860 accepted as Eurycampta E. von Martens, 1860
- Subgenus Helix (Eurycratera) H. Beck, 1837 accepted as Eurycratera H. Beck, 1837
- Subgenus Helix (Eurystoma) Albers, 1850 accepted as Trachia E. von Martens, 1860
- Subgenus Helix (Eyryomphala) Beck, 1837 accepted as Discus Fitzinger, 1833
- Subgenus Helix (Fruticicola) Held, 1838 accepted as Fruticicola Held, 1838
- Subgenus Helix (Fruticocampylaea) Kobelt, 1871 accepted as Fruticocampylaea Kobelt, 1871
- Subgenus Helix (Fruticoconus) Möllendorff, 1882 accepted as Fruticoconus Möllendorff, 1882
- Subgenus Helix (Fruticotrochus) Kobelt, 1879 accepted as Fruticotrochus Kobelt, 1879
- Subgenus Helix (Galactochilus) F. Sandberger, 1875 accepted as Polydontes (Galactochilus) F. Sandberger, 1875
- Subgenus Helix (Galaxias) Beck, 1837 accepted as Trigonephrus Pilsbry, 1905
- Subgenus Helix (Ganesella) W. T. Blanford, 1863 accepted as Ganesella W. T. Blanford, 1863
- Subgenus Helix (Gastrodonta) Albers, 1850 accepted as Gastrodonta Albers, 1850
- Subgenus Helix (Geotrochus) van Hasselt, 1823 accepted as Geotrochus van Hasselt, 1823
- Subgenus Helix (Glaphyra) Albers, 1850 accepted as Vallonia Risso, 1826
- Subgenus Helix (Glypterpes) Pilsbry, 1893 † accepted as Glypterpes Pilsbry, 1893 †
- Subgenus Helix (Glyptorhagada) Pilsbry, 1891 accepted as Glyptorhagada Pilsbry, 1890
- Subgenus Helix (Glyptostoma) Bland & W. G. Binney, 1873) accepted as Glyptostoma Bland & W. G. Binney, 1873
- Subgenus Helix (Goniodiscus) Fitzinger, 1833 accepted as Gonyodiscus Fitzinger, 1833
- Subgenus Helix (Gonostoma) Held, 1838 accepted as Helicodonta A. Férussac, 1821
- Subgenus Helix (Grandipatula) Cossmann, 1889 † accepted as Grandipatula Cossmann, 1889 †
- Subgenus Helix (Hadra) E. von Martens, 1860 accepted as Hadra E. von Martens, 1860
- Subgenus Helix (Helicella) Gray, 1847 accepted as Oxychilus Fitzinger, 1833
- Subgenus Helix (Helicella) A. Férussac, 1821 accepted as Helicella A. Férussac, 1821
- Subgenus Helix (Helicigona) A. Férussac, 1821 accepted as Helicigona A. Férussac, 1821
- Subgenus Helix (Helicodonta) A. Férussac, 1821 accepted as Helicodonta A. Férussac, 1821
- Subgenus Helix (Helicogena) A. Férussac, 1821 accepted as Helix Linnaeus, 1758
- Subgenus Helix (Helicomela) R. T. Lowe, 1855 accepted as Caseolus (Helicomela) R. T. Lowe, 1855
- Subgenus Helix (Helicophanta) A. Férussac, 1821 accepted as Helicophanta A. Férussac, 1821
- Subgenus Helix (Helicostyla) A. Férussac, 1821 accepted as Helicostyla A. Férussac, 1821
- Subgenus Helix (Heliomane) Moquin-Tandon, 1855
- Subgenus Helix (Heliomanes) [sic] accepted as Helicella A. Férussac, 1821
- Subgenus Helix (Helix) Linnaeus, 1758 represented as Helix Linnaeus, 1758
- Subgenus Helix (Helocogena) [sic] accepted as Helicogena A. Férussac, 1821
- Subgenus Helix (Hemicycla) Swainson, 1840 accepted as Hemicycla Swainson, 1840
- Subgenus Helix (Hemiplecta) Albers, 1850 accepted as Hemiplecta Albers, 1850
- Subgenus Helix (Hemistenotrema) O. Boettger, 1897 † accepted as Hemistenotrema O. Boettger, 1897 †
- Subgenus Helix (Hemitrochus) Swainson, 1840 accepted as Hemitrochus Swainson, 1840
- Subgenus Helix (Hispidana) Fagot, 1883 accepted as Trochulus Chemnitz, 1786
- Subgenus Helix (Hispidella) R. T. Lowe, 1852 accepted as Actinella (Hispidella) R. T. Lowe, 1852
- Subgenus Helix (Huttonella) Suter, 1890 accepted as Ptychodon Ancey, 1888
- Subgenus Helix (Hyalina) S. Studer, 1820 accepted as Vitrina Draparnaud, 1801
- Subgenus Helix (Hyalinia) Charpentier, 1837 accepted as Oxychilus Fitzinger, 1833
- Subgenus Helix (Hygromane) Moquin-Tandon, 1856 accepted as Hygromia Risso, 1826
- Subgenus Helix (Hygromia) Risso, 1826 accepted as Hygromia Risso, 1826
- Subgenus Helix (Hystricella) R. T. Lowe, 1855 accepted as Hystricella R. T. Lowe, 1855
- Subgenus Helix (Iberus) Montfort, 1810 accepted as Iberus Montfort, 1810
- Subgenus Helix (Irus) R. T. Lowe, 1852 accepted as Spirorbula R. T. Lowe, 1852
- Subgenus Helix (Isaurica) Kobelt, 1901 accepted as Isaurica Kobelt, 1901
- Subgenus Helix (Isognostoma) Fitzinger, 1833 accepted as Isognomostoma Fitzinger, 1833
- Subgenus Helix (Isomeria) Albers, 1850 accepted as Isomeria Albers, 1850
- Subgenus Helix (Isthmia) J. E. Gray, 1821 accepted as Vertigo (Isthmia) J. E. Gray, 1821
- Subgenus Helix (Jacosta) Gray, 1821 accepted as Xerosecta Monterosato, 1892
- Subgenus Helix (Janira) Albers, 1850 accepted as Oreobba Pilsbry, 1894
- Subgenus Helix (Janulus) R. T. Lowe, 1852 accepted as Janulus R. T. Lowe, 1852
- Subgenus Helix (Jasonella) Lindholm, 1927 accepted as Jasonella Lindholm, 1927
- Subgenus Helix (Jeanneretia) L. Pfeiffer, 1877 accepted as Jeanneretia L. Pfeiffer, 1877
- Subgenus Helix (Kaliella) W. T. Blanford, 1863 accepted as Kaliella W. T. Blanford, 1863
- Subgenus Helix (Katostoma) R. T. Lowe, 1855 accepted as Leptaxis (Katostoma) R. T. Lowe, 1855
- Subgenus Helix (Kaznakoviella) Lindholm, 1922 accepted as Kaznakoviella Lindholm, 1922
- Subgenus Helix (Labyrinthus) Beck, 1837 accepted as Labyrinthus H. Beck, 1837
- Subgenus Helix (Leiocheila) Albers, 1850 accepted as Eurycratera H. Beck, 1837
- Subgenus Helix (Lemniscia) R. T. Lowe, 1855 accepted as Lemniscia R. T. Lowe, 1855
- Subgenus Helix (Leptaxis) R. T. Lowe, 1852 accepted as Leptaxis R. T. Lowe, 1852
- Subgenus Helix (Leucochroa) H. Beck, 1837 accepted as Theba Risso, 1826
- Subgenus Helix (Levantina) Kobelt, 1871 accepted as Levantina Kobelt, 1871
- Subgenus Helix (Libera) Garrett, 1881 accepted as Libera Garrett, 1881
- Subgenus Helix (Limbatiana) Caziot, 1910 accepted as Hygromia (Riedelia) Schileyko, 1972
- Subgenus Helix (Limicolarius) Beck, 1837 accepted as Limicolaria Schumacher, 1817
- Subgenus Helix (Liochila) E. von Martens, 1860 accepted as Leiocheila Albers, 1850
- Subgenus Helix (Lucena) Hartmann, 1821 accepted as Lucena Hartmann, 1821
- Subgenus Helix (Lucerna) Swainson, 1840 accepted as Lucerna Swainson, 1840
- Subgenus Helix (Lucilla) R. T. Lowe, 1852 accepted as Lucilla R. T. Lowe, 1852
- Subgenus Helix (Lyrula) Wollaston, 1878 accepted as Monilearia (Lyrula) Wollaston, 1878
- Subgenus Helix (Lysinoe) A. Adams & H. Adams, 1855 accepted as Lysinoe H. Adams & A. Adams, 1855
- Subgenus Helix (Macrocyclis) Beck, 1837 accepted as Macrocyclis H. Beck, 1837
- Subgenus Helix (Macularia) Albers, 1850 accepted as Macularia Albers, 1850
- Subgenus Helix (Maltzanella) P. Hesse, 1917 accepted as Maltzanella P. Hesse, 1917
- Subgenus Helix (Maltzania) P. Hesse, 1908 accepted as Helix (Maltzanella) P. Hesse, 1917
- Subgenus Helix (Maoriana) Suter, 1891 accepted as Ptychodon Ancey, 1888
- Subgenus Helix (Marmorana) W. Hartmann, 1844 accepted as Marmorana W. Hartmann, 1844
- Subgenus Helix (Merope) E. von Martens, 1860 accepted as Solmotella Iredale, 1941
- Subgenus Helix (Mesodon) A. Férussac, 1821 accepted as Mesodon A. Férussac, 1821
- Subgenus Helix (Mesomphix) Rafinesque, 1819 accepted as Mesomphix Rafinesque, 1819
- Subgenus Helix (Metodontia) Möllendorff, 1886 accepted as Metodontia Möllendorff, 1886
- Subgenus Helix (Micrarionta) Ancey, 1880 accepted as Micrarionta Ancey, 1880
- Subgenus Helix (Microconus) Strebel & Pfeffer, 1879 accepted as Microconus Strebel & Pfeffer, 1879
- Subgenus Helix (Microcystis) Beck, 1838 accepted as Microcystis H. Beck, 1838
- Subgenus Helix (Micromphalia) Ancey, 1882 accepted as Micromphalia Ancey, 1882
- Subgenus Helix (Microphysa) E. von Martens, 1860 accepted as Hojeda H. B. Baker, 1926
- Subgenus Helix (Microphyura) Ancey, 1882 accepted as Microphyura Ancey, 1882
- Subgenus Helix (Mitra) Albers, 1850 accepted as Lampadia Albers, 1854
- Subgenus Helix (Moellendorffia) Ancey, 1887 accepted as Moellendorffia Ancey, 1887
- Subgenus Helix (Monacha) Fitzinger, 1833 accepted as Monacha Fitzinger, 1833
- Subgenus Helix (Monilearia) Mousson, 1872 accepted as Monilearia Mousson, 1872
- Subgenus Helix (Monomphalus) Ancey, 1882 accepted as Monomphalus Ancey, 1882
- Subgenus Helix (Mycena) Albers, 1850 accepted as Hemicycla Swainson, 1840
- Subgenus Helix (Naegelea) P. Hesse, 1918 accepted as Helix (Pelasga) P. Hesse, 1908
- Subgenus Helix (Nanina) J. E. Gray, 1834 accepted as Nanina J. E. Gray, 1834
- Subgenus Helix (Nothus) Albers, 1850 accepted as Leptinaria H. Beck, 1837
- Subgenus Helix (Numidia) Issel, 1885 accepted as Xeroplana Monterosato, 1892
- Subgenus Helix (Nummulina) Kobelt, 1871 accepted as Monacha Fitzinger, 1833
- Subgenus Helix (Obba) H. Beck, 1837 accepted as Obba H. Beck, 1837
- Subgenus Helix (Obbinula) Stache, 1889 † accepted as Obbinula Stache, 1889 †
- Subgenus Helix (Ochthephila) Beck, 1837 accepted as Trochoidea T. Brown, 1827
- Subgenus Helix (Omalonyx) A. d'Orbigny, 1838 accepted as Omalonyx A. d'Orbigny, 1838
- Subgenus Helix (Ophiogyra) Albers, 1850 accepted as Polygyratia J. E. Gray, 1847
- Subgenus Helix (Ophiospila) Ancey, 1887 accepted as Solaropsis H. Beck, 1837
- Subgenus Helix (Orsiniana) Caziot, 1910 accepted as Monacha Fitzinger, 1833
- Subgenus Helix (Otala) Schumacher, 1817 represented as Otala Schumacher, 1817
- Subgenus Helix (Pachya) Albers, 1850 accepted as Pachya Albers, 1850
- Subgenus Helix (Pachystoma) Albers, 1850 accepted as Thelidomus Swainson, 1840
- Subgenus Helix (Papuina) E. von Martens, 1860 accepted as Papuina E. von Martens, 1860
- Subgenus Helix (Parachloraea) F. Sandberger, 1873 † accepted as Parachloraea F. Sandberger, 1873 †
- Subgenus Helix (Pararhytida) Ancey, 1882 accepted as Pararhytida Ancey, 1882
- Subgenus Helix (Parthena) Albers, 1850 accepted as Parthena Albers, 1850
- Subgenus Helix (Paryphanta) Albers, 1850 accepted as Paryphanta Albers, 1850
- Subgenus Helix (Patera) Albers, 1850 accepted as Patera Albers, 1850
- Subgenus Helix (Patula) Held, 1838 accepted as Discus Fitzinger, 1833
- Subgenus Helix (Pelasga) P. Hesse, 1908 represented as Helix Linnaeus, 1758
- Subgenus Helix (Pella) E. von Martens, 1860 accepted as Trachycystis Pilsbry, 1893
- Subgenus Helix (Petasia) Beck, 1837 accepted as Perforatella Schlüter, 1838
- Subgenus Helix (Petasina) H. Beck, 1847 accepted as Petasina H. Beck, 1847
- Subgenus Helix (Phaedra) Albers, 1850 accepted as Hemitrochus Swainson, 1840
- Subgenus Helix (Phania) E. von Martens, 1860 accepted as Pyrochilus Pilsbry, 1893
- Subgenus Helix (Phasis) Albers, 1850 accepted as Phortion Preston, 1910
- Subgenus Helix (Philina) Albers, 1850 accepted as Obba H. Beck, 1837
- Subgenus Helix (Physospira) C. R. Boettger, 1914 accepted as Helix Linnaeus, 1758
- Subgenus Helix (Pileolus) R. P. Lesson, 1831 accepted as Megalacron I. Rensch, 1934
- Subgenus Helix (Pilsbrya) Ancey, 1887 accepted as Epiphragmophora (Pilsbrya) Ancey, 1887
- Subgenus Helix (Pilula) E. von Martens, 1898 accepted as Pilula E. von Martens, 1898
- Subgenus Helix (Pitys) Mörch, 1852 accepted as Pitys Mörch, 1852
- Subgenus Helix (Pitys) H. Beck, 1837
- Subgenus Helix (Placentula) R. T. Lowe, 1852 accepted as Disculella Pilsbry, 1895
- Subgenus Helix (Plagioptycha) L. Pfeiffer, 1955 accepted as Plagioptycha L. Pfeiffer, 1855
- Subgenus Helix (Planispira) H. Beck, 1837 accepted as Planispira H. Beck, 1837
- Subgenus Helix (Platystoma) Ancey, 1882 accepted as Platyrhytida T. D. A. Cockerell, 1895
- Subgenus Helix (Plebecula) R. T. Lowe, 1852 accepted as Actinella (Plebecula) R. T. Lowe, 1852
- Subgenus Helix (Plectopylis) W. H. Benson, 1860 accepted as Plectopylis W. H. Benson, 1860
- Subgenus Helix (Plectotropis) E. von Martens, 1860 accepted as Plectotropis E. von Martens, 1860
- Subgenus Helix (Pleurodonta) Albers, 1850 accepted as Pleurodonte Fischer von Waldheim, 1807
- Subgenus Helix (Poecilostola) Ancey, 1886 accepted as Pilsbrya Ancey, 1887
- Subgenus Helix (Poecilostylus) Pilsbry, 1890 accepted as Eurystyla Ancey, 1887
- Subgenus Helix (Polydontes) Montfort, 1810 accepted as Polydontes Montfort, 1810
- Subgenus Helix (Polygyra) Say, 1818 accepted as Polygyra Say, 1818
- Subgenus Helix (Polygyrella) Bland, 1869 accepted as Polygyrella Bland, 1869
- Subgenus Helix (Polymita) H. Beck, 1837 accepted as Polymita H. Beck, 1837
- Subgenus Helix (Pomatia) H. Beck, 1837 accepted as Helix Linnaeus, 1758
- Subgenus Helix (Pomatiana) Fagot, 1903 accepted as Helix Linnaeus, 1758
- Subgenus Helix (Praticolella) E. von Martens, 1892 accepted as Praticolella E. von Martens, 1892
- Subgenus Helix (Priodontura) H. Fischer, 1900 accepted as Lysinoe H. Adams & A. Adams, 1855
- Subgenus Helix (Prothelidomus) Oppenheim, 1890 † accepted as Prothelidomus Oppenheim, 1890 †
- Subgenus Helix (Psadara) K. Miller, 1878 accepted as Solaropsis (Psadara) K. Miller, 1878
- Subgenus Helix (Pseudobuliminus) Gredler, 1886 accepted as Pseudobuliminus Gredler, 1886
- Subgenus Helix (Pseudocampylaea) P. Hesse, 1884 accepted as Metafruticicola Ihering, 1892
- Subgenus Helix (Pseudomphalus) Ancey, 1882 accepted as Pseudomphalus Ancey, 1882
- Subgenus Helix (Pseudostrobilus) Oppenheim, 1892 † accepted as Pseudostrobilus Oppenheim, 1892 †
- Subgenus Helix (Pseudotachea) C. R. Boettger, 1909 accepted as Pseudotachea C. R. Boettger, 1909
- Subgenus Helix (Pseudoxerophila) Westerlund, 1879 accepted as Pseudoxerophila Westerlund, 1879
- Subgenus Helix (Pulchelliana) Caziot, 1910 accepted as Vallonia Risso, 1826
- Subgenus Helix (Pupa) Lamarck, 1801 accepted as Cerion Röding, 1798
- Subgenus Helix (Pyramidula) Fitzinger, 1833 accepted as Pyramidula Fitzinger, 1833
- Subgenus Helix (Rhagada) E. von Martens, 1860 accepted as Rhagada E. von Martens, 1860
- Subgenus Helix (Rhododerma) P. Hesse, 1918 accepted as Helix Linnaeus, 1758
- Subgenus Helix (Rhytida) Albers, 1860 accepted as Rhytida Albers, 1860
- Subgenus Helix (Rhytidopsis) Ancey, 1882 accepted as Rhytidopsis Ancey, 1882
- Subgenus Helix (Rimula) R. T. Lowe, 1852 accepted as Actinella R. T. Lowe, 1852
- Subgenus Helix (Rotula) Albers, 1850 accepted as Harmogenanina Germain, 1918
- Subgenus Helix (Sagda) H. Beck, 1837 accepted as Sagda H. Beck, 1837
- Subgenus Helix (Sagdellina) Cossmann, 1889 † accepted as Sagdellina Cossmann, 1889 †
- Subgenus Helix (Sagdinella) Mörch, 1872 accepted as Pupina Vignard, 1829
- Subgenus Helix (Satsuma) A. Adams, 1868 accepted as Satsuma A. Adams, 1868
- Subgenus Helix (Sculptaria) L. Pfeiffer, 1855 accepted as Sculptaria L. Pfeiffer, 1855
- Subgenus Helix (Sericeana) Caziot, 1910 accepted as Trochulus Chemnitz, 1786
- Subgenus Helix (Sesara) Albers, 1860 accepted as Sesara Albers, 1860
- Subgenus Helix (Sivella) W. T. Blanford, 1863 accepted as Sivella W. T. Blanford, 1863
- Subgenus Helix (Solaropsis) Beck, 1837 accepted as Solaropsis H. Beck, 1837
- Subgenus Helix (Sophina) W. H. Benson, 1859 accepted as Sophina W. H. Benson, 1859
- Subgenus Helix (Sphaerospira) Mörch, 1867 accepted as Sphaerospira Mörch, 1867
- Subgenus Helix (Spirorbula) C. T. Lowe, 1852 accepted as Spirorbula R. T. Lowe, 1852
- Subgenus Helix (Stegodera) E. von Martens, 1876 accepted as Stegodera E. von Martens, 1876
- Subgenus Helix (Stenotrema) Rafinesque, 1819 accepted as Stenotrema Rafinesque, 1819
- Subgenus Helix (Stephanoda) E. von Martens, 1860 accepted as Stephanoda E. von Martens, 1860
- Subgenus Helix (Stepsanoda) L. Pfeiffer, 1879 accepted as Stephanoda E. von Martens, 1860
- Subgenus Helix (Sterna) Albers, 1850 accepted as Elona H. Adams & A. Adams, 1855
- Subgenus Helix (Streptaxis) Gray, 1837 accepted as Streptaxis J. E. Gray, 1837
- Subgenus Helix (Strigilliana) Fagot, 1893 accepted as Euomphalia Westerlund, 1889
- Subgenus Helix (Stylodonta) De Cristofori & Jan, 1832 accepted as Stylodonta De Cristofori & Jan, 1832
- Subgenus Helix (Succinea) Draparnaud, 1801 accepted as Succinea Draparnaud, 1801
- Subgenus Helix (Sulcobasis) Tapparone Canefri, 1883 accepted as Sulcobasis Tapparone Canefri, 1883
- Subgenus Helix (Systenostoma) Bavay & Dautzenberg, 1909 accepted as Systenostoma Bavay & Dautzenberg, 1909
- Subgenus Helix (Systrophia) L. Pfeiffer, 1855 accepted as Systrophia L. Pfeiffer, 1855
- Subgenus Helix (Tachaea) [sic] accepted as Cepaea Held, 1838
- Subgenus Helix (Tachea) W. Turton, 1831 accepted as Cepaea Held, 1838
- Subgenus Helix (Tacheocampylaea) L. Pfeiffer, 1877 accepted as Tacheocampylaea L. Pfeiffer, 1877
- Subgenus Helix (Tectula) R. T. Lowe, 1852 accepted as Discula R. T. Lowe, 1852
- Subgenus Helix (Telonensiana) Caziot, 1909 accepted as Urticicola Lindholm, 1927
- Subgenus Helix (Thalassia) E. von Martens, 1860 accepted as Nitor Gude, 1911
- Subgenus Helix (Thea) Albers, 1850 accepted as Plectotropis E. von Martens, 1860
- Subgenus Helix (Theba) Risso, 1826 accepted as Theba Risso, 1826
- Subgenus Helix (Thelidomus) Swainson, 1840 accepted as Thelidomus Swainson, 1840
- Subgenus Helix (Thersites) L. Pfeiffer, 1855 accepted as Thersites L. Pfeiffer, 1855
- Subgenus Helix (Trachia) E. von Martens, 1860 accepted as Trachia E. von Martens, 1860
- Subgenus Helix (Trachycystis) Pilsbry, 1893 accepted as Trachycystis Pilsbry, 1893
- Subgenus Helix (Transiberus) Monterosato, 1894 accepted as Marmorana W. Hartmann, 1844
- Subgenus Helix (Trichia) Hartmann, 1840 accepted as Trochulus Chemnitz, 1786
- Subgenus Helix (Trichochloritis) Pilsbry, 1891 accepted as Trichochloritis Pilsbry, 1891
- Subgenus Helix (Trichodiscina) E. von Martens, 1892 accepted as Trichodiscina E. von Martens, 1892
- Subgenus Helix (Trigonostoma) Fitzinger, 1833 accepted as Helicodonta A. Férussac, 1821
- Subgenus Helix (Triodopsis) Rafinesque, 1819 accepted as Triodopsis Rafinesque, 1819
- Subgenus Helix (Trochomorpha) Albers, 1850 accepted as Trochomorpha Albers, 1850
- Subgenus Helix (Trochomorphoides) G. Nevill, 1878 accepted as Trochomorphoides G. Nevill, 1878
- Subgenus Helix (Trochonanina) Mousson, 1869 accepted as Trochonanina Mousson, 1869
- Subgenus Helix (Trochozonites) Pfeffer, 1883 accepted as Trochozonites Pfeffer, 1883
- Subgenus Helix (Turricula) H. Beck, 1837 accepted as Trochoidea T. Brown, 1827
- Subgenus Helix (Tyrrhenaria) P. Hesse, 1918 accepted as Tyrrhenaria P. Hesse, 1918
- Subgenus Helix (Ulostoma) Albers, 1850 accepted as Polygyra Say, 1818
- Subgenus Helix (Vallonia) Risso, 1826 accepted as Vallonia Risso, 1826
- Subgenus Helix (Videna) H. Adams & A. Adams, 1855 accepted as Videna H. Adams & A. Adams, 1855
- Subgenus Helix (Vortex) Beck, 1837 accepted as Helicodonta A. Férussac, 1821
- Subgenus Helix (Xanthomelon) E. von Martens, 1860 accepted as Xanthomelon E. von Martens, 1860
- Subgenus Helix (Xenothauma) Fulton, 1896 accepted as Scutalus Albers, 1850
- Subgenus Helix (Xeroleuca) Kobelt, 1877 accepted as Xeroleuca Kobelt, 1877
- Subgenus Helix (Xerophila) Held, 1838 accepted as Theba Risso, 1826
- Subgenus Helix (Xerotricha) Monterosato, 1892 accepted as Xerotricha Monterosato, 1892
- Subgenus Helix (Xesta) Albers, 1850 accepted as Xesta Albers, 1850
- Subgenus Helix (Zenobia) J. E. Gray, 1821 accepted as Monacha Fitzinger, 1833
- Subgenus Helix (Zeolia) De Gregorio, 1880 †
- Subgenus Helix (Zonites) Montfort, 1810 accepted as Zonites Montfort, 1810
- Subgenus Helix (Zurama) W. Turton, 1831 accepted as Vallonia Risso, 1826
- Species Helix abax Marie, 1870 accepted as Micromphalia abax (Marie, 1870)
- Species Helix abbadiana Bourguignat, 1883 accepted as Punctum abbadianum (Bourguignat, 1883)
- Species Helix aberrans Mousson, 1863 accepted as Xerolenta obvia (Menke, 1828)
- Species Helix aberrata Souleyet, 1852 accepted as Perrottetia aberrata (Souleyet, 1852)
- Species Helix abjecta R. T. Lowe, 1831 accepted as Caseolus abjectus (R. T. Lowe, 1831)
- Species Helix abjecta A. Gould, 1848 accepted as Neohelix divesta (A. Gould, 1851)
- Species Helix abludens Locard, 1888 accepted as Trochulus striolatus abludens (Locard, 1888)
- Species Helix abnormis Reeve, 1854 accepted as Lucerna lucerna (O. F. Müller, 1774)
- Species Helix abrettensis Fontannes, 1876 † accepted as Pseudochloritis abrettensis (Fontannes, 1876) †
- Species Helix abrochroa Crosse, 1868 accepted as Trochomorpha abrochroa (Crosse, 1868)
- Species Helix abscondita R. A. Philippi, 1855
- Species Helix absidata Locard, 1899 accepted as Xeroplexa belemensis (Servain, 1880)
- Species Helix abyssorum A. d'Orbigny, 1835 accepted as Drymaeus abyssorum (A. d'Orbigny, 1835)
- Species Helix acalles L. Pfeiffer, 1857 accepted as Euplecta acalles (L. Pfeiffer, 1857)
- Species Helix acanthinula Crosse, 1868 accepted as Acanthoptyx acanthinula (Crosse, 1868)
- Species Helix accrescens Heude, 1882 accepted as Aegista accrescens (Heude, 1882)
- Species Helix acentromphala Bourguignat, 1880 accepted as Backeljaia gigaxii (L. Pfeiffer, 1847)
- Species Helix acerra J. Lewis, 1871 accepted as Ventridens acerra (J. Lewis, 1871)
- Species Helix acerra W. H. Benson, 1859 accepted as Sarika birmana (L. Pfeiffer, 1857)
- Species Helix acetabulum Pease, 1861 accepted as Nesodiscus obolus (A. Gould, 1846)
- Species Helix achates Rossmässler, 1835 accepted as Chilostoma achates (Rossmässler, 1835)
- Species Helix achatina L. Pfeiffer, 1845 accepted as Plectopylis repercussa (A. Gould, 1856)
- Species Helix achilli Bourguignat, 1883 accepted as Lejeania isseli (Morelet, 1872)
- Species Helix acieformis Klein, 1846 † accepted as Aegopis acieformis (Klein, 1846) †
- Species Helix acies A. Férussac, 1819 accepted as Aegopis acies (A. Férussac, 1819)
- Species Helix acmella L. Pfeiffer, 1860 accepted as Papuina meta (L. Pfeiffer, 1856)
- Species Helix acompsia Bourguignat, 1863
- Species Helix acosmia Bourguignat, 1882 accepted as Candidula unifasciata acosmia (Bourguignat, 1882)
- Species Helix acris W. H. Benson, 1859 accepted as Ganesella acris (W. H. Benson, 1859)
- Species Helix acropachia Mabille, 1880 accepted as Tacheocampylaea acropachia (Mabille, 1880)
- Species Helix actinophora R. T. Lowe, 1831 accepted as Actinella (Actinella) actinophora actinophora (R. T. Lowe, 1831)
- Species Helix acuducta W. H. Benson, 1850 accepted as Euplecta acuducta (W. H. Benson, 1850)
- Species Helix aculeata O. F. Müller, 1774 accepted as Acanthinula aculeata (O. F. Müller, 1774)
- Species Helix acuminata G. B. Sowerby I, 1841 accepted as Hypselostyla acuminata (G. B. Sowerby I, 1841)
- Species Helix acuminata L. Pfeiffer, 1851
- Species Helix acuta Lamarck, 1816 accepted as Lucerna lamarckii (A. Férussac, 1821)
- Species Helix acuta O. F. Müller, 1774 accepted as Cochlicella acuta (O. F. Müller, 1774)
- Species Helix acuta Quoy & Gaimard, 1832 accepted as Papuina acuta (Quoy & Gaimard, 1832)
- Species Helix acutangula Burrow, 1815 accepted as Parthena acutangula (Burrow, 1815)
- Species Helix acutedentata W. G. Binney, 1857 accepted as Linisa acutedentata (W. G. Binney, 1857)
- Species Helix acutimargo L. Pfeiffer, 1845 accepted as Glyptobensonia acutimargo (L. Pfeiffer, 1845)
- Species Helix acutimargo Brumati, 1838 accepted as Aegopis gemonensis gemonensis (A. Férussac, 1832)
- Species Helix adamnis Dall, 1890 † accepted as Linisa adamnis (Dall, 1890) †
- Species Helix adamsii L. Pfeiffer, 1845 accepted as Philonesia filiceti (H. Beck, 1838)
- Species Helix adansoniae Morelet, 1848 accepted as Trochozonites adansoniae (Morelet, 1848)
- Species Helix adela Westerlund, 1874 accepted as Vallonia pulchella (O. F. Müller, 1774)
- Species Helix adela Angas, 1878 accepted as Leptarionta adela (Angas, 1878)
- Species Helix adelaidae L. Pfeiffer, 1857
- Species Helix adelozona Strobel, 1857 accepted as Chilostoma adelozona (Strobel, 1857)
- Species Helix adipis C. A. White, 1886 †
- Species Helix adolfi L. Pfeiffer, 1854 accepted as Xerosecta adolfi (L. Pfeiffer, 1854)
- Species Helix adoptata Mousson, 1872 accepted as Xerotricha adoptata (Mousson, 1872)
- Species Helix adornata Noulet, 1868 † accepted as Parachloraea adornata (Noulet, 1868) †
- Species Helix adusta G. B. Sowerby I, 1841 accepted as Phoenicobius adustus (G. B. Sowerby I, 1841)
- Species Helix adusta Hinds, 1845
- Species Helix adustus Hinds, 1845 accepted as Helix adusta Hinds, 1845
- Species Helix advena Rossmässler, 1842 accepted as Faustina rossmaessleri (L. Pfeiffer, 1842)
- Species Helix advena P. B. Webb & S. Berthelot, 1833 accepted as Eremina advena (P. B. Webb & S. Berthelot, 1833)
- Species Helix aecouria A. Letourneux & Bourguignat, 1887 accepted as Eobania vermiculata (O. F. Müller, 1774)
- Species Helix aegopinoides Maltzan, 1883 accepted as Oxychilus aegopinoides (Maltzan, 1883)
- Species Helix aegrotus Reeve, 1851 accepted as Chloraea aegrota (Reeve, 1851)
- Species Helix aemula L. Pfeiffer, 1852 accepted as Kosicia ambrosi (Strobel, 1852)
- Species Helix aenea Krauss, 1848 accepted as Chalcocystis aenea (Krauss, 1848)
- Species Helix aenigma Dohrn, 1875 accepted as Labyrinthus aenigma (Dohrn, 1875)
- Species Helix aequatoria L. Pfeiffer, 1860 accepted as Isomeria aequatoria (L. Pfeiffer, 1860)
- Species Helix aequatoriana Hidalgo, 1867 accepted as Isomeria aequatoriana (Hidalgo, 1867)
- Species Helix aeruginosa A. Gould, 1855 accepted as Helminthoglypta arrosa arrosa (W. G. Binney, 1858)
- Species Helix aeruginosa Reeve, 1854 accepted as Chloraea aeruginosa (Reeve, 1854)
- Species Helix aesopus Angas, 1878 accepted as Labyrinthus triplicatus (E. von Martens, 1868)
- Species Helix aestuariorum Noulet, 1857 † accepted as Cepaea subtrochoides (A. d'Orbigny, 1852) †
- Species Helix aethyops M. Bielz, 1851 accepted as Arianta aethyops (M. Bielz, 1851)
- Species Helix aetnaea Benoit, 1857 accepted as Xerotricha conspurcata (Draparnaud, 1801)
- Species Helix affinis Thomä, 1845 † accepted as Cyrtochilus expansilabris (F. Sandberger, 1858) †
- Species Helix afra Gmelin, 1791 accepted as Pedipes pedipes (Bruguière, 1789)
- Species Helix afra L. Pfeiffer, 1859 accepted as Trachycystis tollini (W. H. Benson, 1856)
- Species Helix africae A. D. Brown, 1865 accepted as Chilocystis africae (A. D. Brown, 1865)
- Species Helix agardhi Pallary, 1899 accepted as Ponentina ponsonbyana (Pilsbry, 1895)
- Species Helix aggerivaga Mabille, 1880 accepted as Cornu aspersum (O. F. Müller, 1774)
- Species Helix aggiei Heimburg, 1890 accepted as Crystallopsis hunteri (J. C. Cox, 1872)
- Species Helix aginensis Noulet, 1854 † accepted as Parachloraea oxystoma (Thomä, 1845) †
- Species Helix aginnica Locard, 1882 accepted as Cernuella aginnica (Locard, 1882)
- Species Helix aglaia L. Pfeiffer, 1855 accepted as Helix aglaja Reeve, 1854
- Species Helix aglaja Reeve, 1854 accepted as Everettia aglaja (Reeve, 1854)
- Species Helix aglaometa Mabille, 1882 accepted as Cernuella virgata (Da Costa, 1778)
- Species Helix agnocheilus E. A. Smith, 1892 accepted as Canefriula azonata (Hedley, 1891)
- Species Helix agreabilis Kobelt, 1878
- Species Helix ahmarina Bourguignat, 1884 accepted as Otala lactea (O. F. Müller, 1774)
- Species Helix ahmedi Pallary, 1899
- Species Helix aidae Pallary, 1899
- Species Helix aigenensis Tausch, 1886 † accepted as Pseudostrobilus aigenensis (Tausch, 1886) †
- Species Helix ajax L. Pfeiffer, 1861 accepted as Helix polillensis L. Pfeiffer, 1861
- Species Helix akowtongensis Theobald, 1859 accepted as Plectotropis akowtongensis (Theobald, 1859)
- Species Helix alabaster Rang, 1831 accepted as Lignus alabaster (Rang, 1831)
- Species Helix alabastra Bourguignat, 1884 accepted as Otala xanthodon (Anton, 1838)
- Species Helix alabastrites Michaud, 1833 accepted as Loxana alabastrites (Michaud, 1833)
- Species Helix alata L. Pfeiffer, 1856 accepted as Tropidoptera alata (L. Pfeiffer, 1856)
- Species Helix alauda A. Férussac, 1821 accepted as Coryda alauda (A. Férussac, 1821)
- Species Helix alba Bouillet, 1835 †
- Species Helix albaiensis G. B. Sowerby I, 1841 accepted as Calocochlea albaiensis (G. B. Sowerby I, 1841)
- Species Helix albanensis J. C. Cox, 1868 accepted as Pernagera albanensis (J. C. Cox, 1868)
- Species Helix albanica Rossmässler, 1836 accepted as Paraegopis albanicus (Rossmässler, 1836)
- Species Helix albata Fagot, 1879
- Species Helix albella Linnaeus, 1758 accepted as Theba pisana (O. F. Müller, 1774)
- Species Helix albersi L. Pfeiffer, 1849 accepted as Helicostyla jonasi (L. Pfeiffer, 1846)
- Species Helix albersiana L. Pfeiffer, 1853 accepted as Plagioptycha albersiana (L. Pfeiffer, 1853)
- Species Helix alberti Kobelt, 1883
- Species Helix albescens Rossmässler, 1839
- Species Helix albicans L. Pfeiffer, 1850 accepted as Stauroglypta anthoniana (C. B. Adams, 1849)
- Species Helix albicans Gmelin, 1791 accepted as Omphiscola glabra (O. F. Müller, 1774)
- Species Helix albicostis L. Pfeiffer, 1860 accepted as Trachia albicostis (L. Pfeiffer, 1860)
- Species Helix albidens W. H. Benson, 1853 accepted as Erepta stylodon (L. Pfeiffer, 1842)
- Species Helix albigensis Noulet, 1854 † accepted as Parachloraea albigensis (Noulet, 1854) †
- Species Helix albizonata Dohrn, 1858 accepted as Euplecta albizonata (Dohrn, 1858)
- Species Helix albocincta A. Gould, 1851 accepted as Praticolella griseola (L. Pfeiffer, 1841)
- Species Helix albocincta L. Pfeiffer, 1846 accepted as Videna albocincta (L. Pfeiffer, 1846)
- Species Helix albolabris Say, 1817 accepted as Neohelix albolabris albolabris (Say, 1817)
- Species Helix albolineata A. Gould, 1857 accepted as Praticolella griseola (L. Pfeiffer, 1841)
- Species Helix albozonata A. Gould, 1857 accepted as Praticolella griseola (L. Pfeiffer, 1841)
- Species Helix albula Le Guillou, 1842 accepted as Papuina vitrea (A. Férussac, 1821)
- Species Helix albula Studer, 1820
- Species Helix albulana Servain, 1889
- Species Helix albumenoidea J. C. Cox, 1868 accepted as Echonitor albumenoideus (J. C. Cox, 1868)
- Species Helix alcarazana Rossmässler, 1854 accepted as Iberus alonensis (A. Férussac, 1821)
- Species Helix alexandri Forbes, 1852 accepted as Helenoconcha polyodon (G. B. Sowerby I, 1844)
- Species Helix alexandri (Gray, 1838) accepted as Dorcasia alexandri J. E. Gray, 1838
- Species Helix alfredi J. C. Cox, 1871 accepted as Megalacron alfredi (J. C. Cox, 1871)
- Species Helix algira Linnaeus, 1758 accepted as Zonites algirus (Linnaeus, 1758)
- Species Helix algiroides Reuss, 1849 † accepted as Miozonites algiroides (Reuss, 1849) †
- Species Helix alicurensis Benoit, 1857 accepted as Oxychilus alicurensis (Benoit, 1857)
- Species Helix aliena d'Ailly, 1910 accepted as Halolimnohelix aliena (d'Ailly, 1910)
- Species Helix aliena L. Pfeiffer, 1841
- Species Helix alienus d'Ailly, 1910 accepted as Helix aliena d'Ailly, 1910
- Species Helix alinae Pallary, 1899
- Species Helix allasteri J. C. Cox, 1873 accepted as Crystallopsis hunteri (J. C. Cox, 1872)
- Species Helix allecta J. C. Cox, 1870 accepted as Sinployea allecta (J. C. Cox, 1870)
- Species Helix alleniana Paiva, 1866 accepted as Discula polymorpha alleniana (Paiva, 1866)
- Species Helix alleryana Crosse, 1869
- Species Helix alliaria J. S. Miller, 1822 accepted as Oxychilus alliarius (J. S. Miller, 1822)
- Species Helix alligans C. B. Adams, 1850 accepted as Sagda alligans (C. B. Adams, 1850)
- Species Helix alloiodes Thomä, 1845 † accepted as Palaeotachea alloiodes (Thomä, 1845) †
- Species Helix allporti Legrand, 1871 accepted as Mulathena fordei (Brazier, 1871)
- Species Helix alluvionum Servain, 1880 accepted as Cernuella virgata (Da Costa, 1778)
- Species Helix alonensis A. Férussac, 1821 accepted as Iberus alonensis (A. Férussac, 1821)
- Species Helix alpestris Rossmässler, 1837 accepted as Arianta arbustorum alpicola (A. Férussac, 1821)
- Species Helix alpha L. Pfeiffer, 1853 accepted as Aeschrodomus stipulata (Reeve, 1852)
- Species Helix alphonsi Deshayes, 1870 accepted as Sinicola alphonsi (Deshayes, 1870)
- Species Helix alpillensis Roman, 1924 †
- Species Helix alpina Ménétries, 1832 accepted as Caucasigena eichwaldi armeniaca (L. Pfeiffer, 1846)
- Species Helix alpina Michaud, 1831 accepted as Delphinatia fontenillii alpina (Michaud, 1831)
- Species Helix alsia Bourguignat, 1863 accepted as Schileykiella alsia (Bourguignat, 1863)
- Species Helix alsiella Pallary, 1899
- Species Helix alsophila R. A. Philippi, 1867 accepted as Epiphragmophora alsophila (R. A. Philippi, 1867)
- Species Helix alta Pease, 1868 accepted as Mendana rectangula (L. Pfeiffer, 1846)
- Species Helix altenana Kickx, 1830 accepted as Euomphalia strigella (Draparnaud, 1801)
- Species Helix alternata Say, 1817 accepted as Anguispira alternata (Say, 1817)
- Species Helix alticola d'Ailly, 1910 accepted as Haplohelix alticola (d'Ailly, 1910)
- Species Helix altispira "Meek" †
- Species Helix altispira E. von Martens, 1892 accepted as Leptarionta altispira (E. von Martens, 1892)
- Species Helix alvarezii A. d'Orbigny, 1835 accepted as Clessinia alvarezii (A. d'Orbigny, 1835)
- Species Helix alveare L. Pfeiffer, 1862 accepted as Sagda alveare (L. Pfeiffer, 1862)
- Species Helix alveolus Gassies, 1882 accepted as Andrefrancia alveolus (Gassies, 1882)
- Species Helix alveolus Heude, 1890
- Species Helix alveus F. Sandberger, 1875 † accepted as Agalactochilus inflexus (Zieten, 1832) †
- Species Helix alveus C. B. Adams, 1850 accepted as Stauroglypta alveus (C. B. Adams, 1850)
- Species Helix amabilis C. B. Adams, 1850 accepted as Dentellaria amabilis (C. B. Adams, 1850)
- Species Helix amaliae Kobelt, 1875 accepted as Euhadra amaliae (Kobelt, 1875)
- Species Helix amaliae Kobelt, 1876
- Species Helix amancaezensis Hidalgo, 1869 accepted as Rotadiscus amancaezensis (Hidalgo, 1869)
- Species Helix amanda Rossmässler, 1838 accepted as Cernuella amanda (Rossmässler, 1838)
- Species Helix amarula Linnaeus, 1758 accepted as Thiara amarula (Linnaeus, 1758)
- Species Helix amazonica Reeve, 1854 accepted as Solaropsis amazonica (Reeve, 1854)
- Species Helix amberti Michaud, 1855 † accepted as Apula amberti (Michaud, 1855) †
- Species Helix ambidotina Bourguignat, 1881 † accepted as Tropidomphalus (Pseudochloritis) dicroceri (Bourguignat, 1881) †
- Species Helix ambigua Linnaeus, 1758 accepted as Fossarus ambiguus (Linnaeus, 1758)
- Species Helix ambigua Mousson, 1859 accepted as Helix borealis Mousson, 1859
- Species Helix ambigua C. B. Adams, 1849 accepted as Hyalosagda similis (C. B. Adams, 1849)
- Species Helix amblasmodon Mabille, 1883
- Species Helix amblytropis F. Sandberger, 1872 † accepted as Dentellocaracolus amblytropis (F. Sandberger, 1872) †
- Species Helix ambrosi Strobel, 1852 accepted as Kosicia ambrosi (Strobel, 1852)
- Species Helix ambusta Ancey, 1884
- Species Helix amicta Reeve, 1851 accepted as Calocochlea amicta (Reeve, 1851)
- Species Helix amictella Mabille, 1889 accepted as Camaena choboensis (Mabille, 1889)
- Species Helix ammiralis L. Pfeiffer, 1857 accepted as Satsuma ammiralis (L. Pfeiffer, 1857)
- Species Helix ammonia Deshayes, 1850 accepted as Ariophanta ammonia (Deshayes, 1850)
- Species Helix ammoniformis A. d'Orbigny, 1835 accepted as Drepanostomella ammoniformis (A. d'Orbigny, 1835)
- Species Helix ammonis Strobel, 1857 accepted as Cernuella neglecta (Draparnaud, 1805)
- Species Helix ammonitoides Brazier, 1871 accepted as Ammoniropa vigens (Legrand, 1871)
- Species Helix ammonitoides Reeve, 1854 accepted as Nautiliropa omicron (L. Pfeiffer, 1852)
- Species Helix ammonoceras Reeve, 1854 accepted as Happia ammonoceras (Reeve, 1854)
- Species Helix amoena L. Pfeiffer, 1845 accepted as Chloraea amoena (L. Pfeiffer, 1845)
- Species Helix amori Hidalgo, 1867 accepted as Solaropsis gibboni (L. Pfeiffer, 1846)
- Species Helix amphibulima L. Pfeiffer, 1847 accepted as Embertoniphanta amphibulima (L. Pfeiffer, 1847)
- Species Helix amphicora Mabille, 1888 accepted as Camaena amphicora (Mabille, 1888)
- Species Helix ampla L. Pfeiffer, 1866 accepted as Praticolella ampla (L. Pfeiffer, 1866)
- Species Helix amplecta L. Pfeiffer & Gundlach, 1860
- Species Helix ampulla W. H. Benson, 1850 accepted as Indrella ampulla (W. H. Benson, 1850)
- Species Helix ampullacea Linnaeus, 1758 accepted as Pila ampullacea (Linnaeus, 1758)
- Species Helix amurensis Gerstfeldt, 1859 accepted as Zoogenetes harpa (Say, 1824)
- Species Helix anacardium Dohrn, 1879 accepted as Phoenicobius anacardium (Dohrn, 1879)
- Species Helix anachoreta W. G. Binney, 1857 accepted as Helminthoglypta nickliniana anachoreta (W. G. Binney, 1858)
- Species Helix anaglyptica Reeve, 1852 accepted as Plebecula anaglyptica (Reeve, 1852)
- Species Helix anax W. H. Benson, 1865 accepted as Corilla anax (W. H. Benson, 1865)
- Species Helix anceps Strubell, 1895 accepted as Sulcobasis meraca (Iredale, 1941)
- Species Helix anceyi Möllendorff, 1889 accepted as Laeocathaica anceyi (Möllendorff, 1889)
- Species Helix anconostoma R. T. Lowe, 1831 accepted as Lauria cylindracea (Da Costa, 1778)
- Species Helix anctostoma E. von Martens, 1874
- Species Helix ancylochila Crosse, 1868
- Species Helix andalusica Kobelt, 1882 accepted as Backeljaia gigaxii (L. Pfeiffer, 1847)
- Species Helix andersoni W. T. Blanford, 1869 accepted as Hunyadiscus andersoni (W. T. Blanford, 1869)
- Species Helix andersoni J. C. Cox, 1872 accepted as Brigaladra volgiola (Iredale, 1933)
- Species Helix andicola L. Pfeiffer, 1846 accepted as Solaropsis andicola (L. Pfeiffer, 1846)
- Species Helix andicola R. A. Philippi, 1866
- Species Helix andromache L. Pfeiffer, 1861 accepted as Helix polillensis L. Pfeiffer, 1861
- Species Helix angasiana Newcomb, 1862 accepted as Quirosena bougainvillei (L. Pfeiffer, 1860)
- Species Helix angasiana L. Pfeiffer, 1862 accepted as Sinumelon godfreyi Iredale, 1933
- Species Helix angelica L. Pfeiffer, 1856 accepted as Bensonies angelica (L. Pfeiffer, 1856)
- Species Helix angigyra Rossmässler, 1834 accepted as Helicodonta angigyra (Rossmässler, 1834)
- Species Helix angistoma A. Férussac, 1821 accepted as Caracolus carinatus (Röding, 1798)
- Species Helix angorensis Germain, 1936 accepted as Xeropicta krynickii (Krynicki, 1833)
- Species Helix angrandi Morelet, 1863 accepted as Epiphragmophora angrandi (Morelet, 1863)
- Species Helix anguicula Hupé, 1853 accepted as Solaropsis anguicula (Hupé, 1853)
- Species Helix anguiculus Reeve, 1852 accepted as Cavellia anguicula (Reeve, 1852)
- Species Helix anguina A. Gould, 1847 accepted as Plectopylis anguina (A. Gould, 1847)
- Species Helix angularis A. Férussac, 1821 accepted as Caldwellia angularis (A. Férussac, 1821)
- Species Helix angulata Rackett, 1821 accepted as Helisoma anceps (Menke, 1830)
- Species Helix angulosa Moricand, 1836 accepted as Leiostracus perlucidus (Spix, 1827)
- Species Helix angustata A. Férussac, 1822 accepted as Hispaniolana angustata (A. Férussac, 1822)
- Species Helix angusticollis E. von Martens, 1875 accepted as Stegodera angusticollis (E. von Martens, 1875)
- Species Helix angustispira C. B. Adams, 1849 accepted as Microsagda angustispira (C. B. Adams, 1849)
- Species Helix ankae Korabek & Hausdorf, 2023
- Species Helix anna (O. Semper, 1862) accepted as Calocochlea festiva (Donovan, 1825)
- Species Helix annae J. Lewis, 1871 accepted as Ventridens acerra (J. Lewis, 1871)
- Species Helix annae O. Semper, 1862 accepted as Calocochlea festiva (Donovan, 1825)
- Species Helix annamitica Crosse & P. Fischer, 1863
- Species Helix annatonensis Reeve, 1854 accepted as Macrocycloides annatonensis (Reeve, 1854)
- Species Helix annulata Case, 1847 accepted as Striatura (Pseudohyalina) exigua (W. Stimpson, 1850)
- Species Helix annulata G. B. Sowerby I, 1841 accepted as Pachysphaera annulata (G. B. Sowerby I, 1841)
- Species Helix annulifera Reeve, 1852 accepted as Labyrinthus subplanatus sipunculatus (Forbes, 1850)
- Species Helix anomala L. Pfeiffer, 1849 accepted as Dentellaria anomala (L. Pfeiffer, 1849)
- Species Helix anomia Heude, 1890
- Species Helix anozona E. von Martens, 1864
- Species Helix ansorinus Theobald, 1866
- Species Helix antelata J. C. Cox, 1870 accepted as Liardetia samoensis (Mousson, 1865)
- Species Helix anthesi Kobelt, 1904 accepted as Helix pomacella Mousson, 1854
- Species Helix anthoniana C. B. Adams, 1849 accepted as Stauroglypta anthoniana (C. B. Adams, 1849)
- Species Helix anthracophila Stache, 1871 † accepted as Obbinula anthracophila (Stache, 1871) †
- Species Helix antialba Petterd, 1879 accepted as Geminoropa antialba (Petterd, 1879)
- Species Helix antiochiensis Kobelt, 1896
- Species Helix antipoda Hombron & Jacquinot, 1841 accepted as Thalassohelix antipoda (Hombron & Jacquinot, 1841)
- Species Helix antiqua A. Adams & Reeve, 1850 accepted as Papuina antiqua (A. Adams & Reeve, 1850)
- Species Helix antiqua Tausch, 1886 †
- Species Helix antoni Rosen, 1914
- Species Helix antonii L. Pfeiffer, 1842
- Species Helix antonini Michaud, 1862 † accepted as Acanthinula antonini (Michaud, 1862) †
- Species Helix antrorsa L. Pfeiffer, 1855 accepted as Cymotropis antrorsa (L. Pfeiffer, 1855)
- Species Helix aorangi Suter, 1890 accepted as Huonodon microundulatum (Suter, 1890)
- Species Helix apennina Stabile, 1864 accepted as Cepaea nemoralis etrusca (Rossmässler, 1835)
- Species Helix aperta Born, 1778 accepted as Cantareus apertus (Born, 1778)
- Species Helix apex C. B. Adams, 1849 accepted as Helicodiscus apex (C. B. Adams, 1849)
- Species Helix apexfulva Dixon, 1789 accepted as Achatinella apexfulva (Dixon, 1789)
- Species Helix aphaea A. Letourneux, 1870
- Species Helix aphrodite L. Pfeiffer, 1859 accepted as Crystallopsis aphrodite (L. Pfeiffer, 1859)
- Species Helix apia Hombron & Jacquinot, 1847 accepted as Trochomorpha apia (Hombron & Jacquinot, 1847)
- Species Helix apicina Lamarck, 1822 accepted as Xerotricha apicina (Lamarck, 1822)
- Species Helix apiculus L. Pfeiffer, 1849 accepted as Trochoidea cumiae (Calcara, 1847)
- Species Helix apollinis E. von Martens, 1882 accepted as Archaica apollinis (E. von Martens, 1882)
- Species Helix apollo L. Pfeiffer, 1860 accepted as Polydontes apollo (L. Pfeiffer, 1860)
- Species Helix aporina Castro, 1887 accepted as Ponentina ponentina (Morelet, 1845)
- Species Helix appeliusi O. Boettger, 1883 accepted as Helix (Fruticocampylaea) narzanensis var. appeliusi O. Boettger, 1883
- Species Helix appendiculata Reeve, 1854 accepted as Figuladra appendiculata (Reeve, 1854)
- Species Helix applanata Möllendorff, 1884 accepted as Plectotropis applanata (Möllendorff, 1884)
- Species Helix appressa Say, 1821 accepted as Patera appressa (Say, 1821)
- Species Helix approximata Le Guillou, 1842 accepted as Trochomorpha approximata (Le Guillou, 1842)
- Species Helix aprica Krauss, 1848 accepted as Chilocystis aprica (Krauss, 1848)
- Species Helix aprutiana Fagot, 1884
- Species Helix apuanica Mabille, 1881 accepted as Monacha cantiana (Montagu, 1803)
- Species Helix aquensis de Serres, 1829 †
- Species Helix arabica Forsskål, 1775 accepted as Euryptyxis labiosa (O. F. Müller, 1774)
- Species Helix arabica Terver, 1839
- Species Helix arabophila Pallary, 1898
- Species Helix arachne Morelet, 1877 accepted as Psichion arachne (Morelet, 1877)
- Species Helix aradasii Pirajno, 1842 accepted as Cernuella aradasii (Pirajno, 1842)
- Species Helix aranea L. Pfeiffer, 1871 accepted as Gittenbergia sororcula (Benoit, 1859)
- Species Helix araneaetela Heude, 1885
- Species Helix arangiana Poey, 1854 accepted as Caracolus marginella (Gmelin, 1791)
- Species Helix arata G. B. Sowerby I, 1841 accepted as Phoenicobius aratus (G. B. Sowerby I, 1841)
- Species Helix arborea Say, 1817 accepted as Zonitoides arboreus (Say, 1817)
- Species Helix arboreoides C. B. Adams, 1845 accepted as Hyalosagda arboreoides (C. B. Adams, 1845)
- Species Helix arboretorum Valenciennes, 1846 accepted as Helminthoglypta nickliniana nickliniana (I. Lea, 1838)
- Species Helix arboreus Say, 1817 accepted as Helix arborea Say, 1817
- Species Helix arbusticola Deshayes, 1870 accepted as Coccoglypta arbusticola (Deshayes, 1870)
- Species Helix arbustorum Linnaeus, 1758 accepted as Arianta arbustorum (Linnaeus, 1758)
- Species Helix arcadica L. Pfeiffer, 1853 accepted as Thiessea arcadica (L. Pfeiffer, 1853)
- Species Helix arcasiana Crosse & Debeaux, 1863 accepted as Karaftohelix arcasiana (Crosse & Debeaux, 1863)
- Species Helix arceutkophila Mabille, 1881 accepted as Xerocrassa geyeri (Soós, 1926)
- Species Helix archimedea Benoit, 1859
- Species Helix arctispira L. Pfeiffer, 1846
- Species Helix arctistria L. Pfeiffer, 1865 accepted as Eurycampta arctistria (L. Pfeiffer, 1865)
- Species Helix arcuata L. Pfeiffer, 1847 accepted as Vitrinoconus cyathus (L. Pfeiffer, 1846)
- Species Helix ardens Ancey, 1884
- Species Helix ardesa Mabille, 1881 accepted as Monacha cantiana (Montagu, 1803)
- Species Helix ardouini Deshayes, 1832 accepted as Papuina lituus (R. P. Lesson, 1831)
- Species Helix ardua J. C. Cox, 1870 accepted as Liardetia samoensis (Mousson, 1865)
- Species Helix arecibensis L. Pfeiffer, 1856 accepted as Caracolus marginella (Gmelin, 1791)
- Species Helix arenaria Olivi, 1792 accepted as Monacha cartusiana (O. F. Müller, 1774)
- Species Helix arenarum Bourguignat, 1863
- Species Helix arenicola Tate, 1878 accepted as Paralaoma morti (J. C. Cox, 1864)
- Species Helix arenosa Krynicki, 1836 accepted as Helicopsis filimargo (Krynicki, 1833)
- Species Helix areolata L. Pfeiffer, 1845 accepted as Xerarionta areolata (L. Pfeiffer, 1845)
- Species Helix arfakiensis Tapparone Canefri, 1886 accepted as Coliolus arfakiensis (Tapparone Canefri, 1886)
- Species Helix arganica Servain, 1880 accepted as Zarateana arganica (Servain, 1880)
- Species Helix argentea Reeve, 1852 accepted as Harmogenanina argentea (Reeve, 1852)
- Species Helix argentellei Kobelt, 1872 accepted as Josephinella argentellei (Kobelt, 1872)
- Species Helix argentina Holmberg, 1909 accepted as Epiphragmophora argentina (Holmberg, 1909)
- Species Helix argilacea A. Férussac, 1821 accepted as Parachloritis argilacea (A. Férussac, 1821)
- Species Helix argillacea [sic] accepted as Parachloritis argilacea (A. Férussac, 1821)
- Species Helix argonautarum Lindholm, 1922 accepted as Monacha mingrelica (P. Hesse, 1918)
- Species Helix argonautula P. B. Webb & S. Berthelot, 1833
- Species Helix arguineguinensis Seddon & Aparicio, 1998 accepted as Monilearia arguineguinensis (Seddon & Aparicio, 1998)
- Species Helix arguta L. Pfeiffer, 1857 accepted as Elaphroconcha bataviana (L. Pfeiffer, 1842)
- Species Helix ariadnae L. Pfeiffer, 1849 accepted as Linisa ariadnae (L. Pfeiffer, 1849)
- Species Helix aridorum J. C. Cox, 1866 accepted as Neveritis aridorum (J. C. Cox, 1866)
- Species Helix arietina Rossmässler, 1846 accepted as Theba pisana arietina (Rossmässler, 1846)
- Species Helix arigonis A. Schmidt, 1853 accepted as Xerosecta arigonis (A. Schmidt, 1853)
- Species Helix aristata Krynicki, 1836 accepted as Euomphalia aristata (Krynicki, 1836)
- Species Helix armeniaca L. Pfeiffer, 1846 accepted as Caucasigena eichwaldi armeniaca (L. Pfeiffer, 1846)
- Species Helix armida L. Pfeiffer, 1853 accepted as Vitrinula biangulata armida (L. Pfeiffer, 1853)
- Species Helix armitageana R. T. Lowe, 1852 accepted as Actinella armitageana (R. T. Lowe, 1852)
- Species Helix armoricensis Cossmann, 1902 † accepted as Acanthinula armoricensis (Cossmann, 1902) †
- Species Helix arneggensis F. Sandberger, 1875 † accepted as Loganiopharynx arneggensis (F. Sandberger, 1875) †
- Species Helix arnoldii Thomä, 1845 † accepted as Tropidomphalus arnoldii (Thomä, 1845) †
- Species Helix arnotti W. H. Benson, 1864 accepted as Microkerkus arnotti (W. H. Benson, 1864)
- Species Helix arnoudii Michaud, 1837 † accepted as Dimorphoptychia arnoudii (Michaud, 1837) †
- Species Helix arnusiaca Fagot, 1884 accepted as Cernuella cisalpina (Rossmässler, 1837)
- Species Helix arrosa W. G. Binney, 1858 accepted as Helminthoglypta arrosa arrosa (W. G. Binney, 1858)
- Species Helix arrouxi Bourguignat, 1863 accepted as Microxeromagna lowei (Potiez & Michaud, 1838)
- Species Helix arrowensis Le Guillou, 1842 accepted as Dendrotrochus arrowensis (Le Guillou, 1842)
- Species Helix artensis Souverbie, 1859 accepted as Orpiella artensis (Souverbie, 1859)
- Species Helix arthuriana J. C. Cox, 1873 accepted as Sphaerospira arthuriana (J. C. Cox, 1873)
- Species Helix artificiosa W. H. Benson, 1856 accepted as Glyptaulax artificiosa (W. H. Benson, 1856)
- Species Helix arundinetorum Heude, 1882
- Species Helix arvernensis Deshayes, 1863 † accepted as Palaeotachea moroguesi (Brongniart, 1810) †
- Species Helix arx W. H. Benson, 1859 accepted as Sitala arx (W. H. Benson, 1859)
- Species Helix asemnis Bourguignat, 1860
- Species Helix aspera Gmelin, 1791 accepted as Mieniplotia scabra (O. F. Müller, 1774)
- Species Helix aspera A. Férussac, 1821 accepted as Thelidomus aspera (A. Férussac, 1821)
- Species Helix aspera Grateloup, 1828 † accepted as Aegopis subdepressus (A. d'Orbigny, 1852) †
- Species Helix asperella L. Pfeiffer, 1846 accepted as Trachia asperella (L. Pfeiffer, 1846)
- Species Helix aspersa O. F. Müller, 1774 accepted as Cornu aspersum (O. F. Müller, 1774)
- Species Helix asperula Deshayes, 1832 † accepted as Megalotachea turonensis (Deshayes, 1832) †
- Species Helix aspides W. H. Benson, 1863 accepted as Tanychlamys aspides (W. H. Benson, 1863)
- Species Helix aspirans W. T. Blanford & H. F. Blanford, 1861 accepted as Kaliella aspirans (W. T. Blanford & H. F. Blanford, 1861)
- Species Helix assimilans J. C. Cox, 1864 accepted as Annabellia assimilans (J. C. Cox, 1864)
- Species Helix assimilaris Gredler, 1878 accepted as Bradybaena similaris assimilaris (Gredler, 1878)
- Species Helix associata Rossmässler, 1835 accepted as Faustina faustina (Rossmässler, 1835)
- Species Helix asteia Bourguignat, 1863
- Species Helix astenia Mabille, 1880
- Species Helix asteriscus E. S. Morse, 1857 accepted as Planogyra asteriscus (E. S. Morse, 1857)
- Species Helix asthena Bourguignat, 1881 † accepted as Leucochroopsis asthena (Bourguignat, 1881) †
- Species Helix astierii A. d'Orbigny, 1850 †
- Species Helix astur Souverbie, 1860 accepted as Platyrhytida astur (Souverbie, 1860)
- Species Helix atacta L. Pfeiffer, 1862
- Species Helix atavus L. Pfeiffer, 1859 accepted as Dentellaria atavus (L. Pfeiffer, 1859)
- Species Helix ataxiaca Fagot, 1883 accepted as Trochulus ataxiacus (Fagot, 1883)
- Species Helix atkinsoni Theobald, 1859 accepted as Planispira atkinsoni (Theobald, 1859)
- Species Helix atlantica Morelet & Drouët, 1857 accepted as Oxychilus atlanticus (Morelet & Drouët, 1857)
- Species Helix atlantidea Morelet, 1873 accepted as Leptaxis atlantidea (Morelet, 1873)
- Species Helix atopa Bourguignat, 1881 † accepted as Cepaea eversa larteti (de Boissy, 1840) †
- Species Helix atrata Reeve, 1852 accepted as Isomeria triodonta (A. d'Orbigny, 1835)
- Species Helix atrata L. Pfeiffer, 1854 accepted as Isomeria jacksoni Solem, 1966
- Species Helix atrocincta Bourguignat, 1883 accepted as Helix lucorum Linnaeus, 1758
- Species Helix atrofusca L. Pfeiffer, 1861 accepted as Planispira atrofusca (L. Pfeiffer, 1861)
- Species Helix atrofusca Albers, 1860 accepted as Hemiplecta densa (A. Adams & Reeve, 1850)
- Species Helix atrolabiata Krynicki, 1833 accepted as Caucasotachea atrolabiata (Krynicki, 1833)
- Species Helix atropos Deshayes, 1840 accepted as Ampelita atropos (Deshayes, 1840)
- Species Helix atrorubra R. P. Lesson, 1831
- Species Helix attegia W. H. Benson, 1859 accepted as Sitala attegia (W. H. Benson, 1859)
- Species Helix attonis L. Pfeiffer, 1840 accepted as Zonitoides arboreus (Say, 1817)
- Species Helix auberi [sic] accepted as Helix auberii A. d'Orbigny, 1841
- Species Helix auberii A. d'Orbigny, 1841
- Species Helix aubryana Heude, 1882 accepted as Aegista aubryana (Heude, 1882)
- Species Helix aucapitainiana Bourguignat, 1863
- Species Helix aucklandica Le Guillou, 1842 accepted as Thalassohelix antipoda (Hombron & Jacquinot, 1841)
- Species Helix audebardi Reeve, 1854 accepted as Hispaniolana audebardi (Reeve, 1854)
- Species Helix audouinii A. d'Orbigny, 1835 accepted as Epiphragmophora audouinii (A. d'Orbigny, 1835)
- Species Helix augusta Albers, 1854 accepted as Calocochlea augusta (Albers, 1854)
- Species Helix aulacophora Ancey, 1890 accepted as Phaulocystis aulacophora (Ancey, 1890)
- Species Helix aulacospira L. Pfeiffer, 1846 accepted as Ptychorhytida aulacospira (L. Pfeiffer, 1846)
- Species Helix aulica Reeve, 1852 accepted as Xesta aulica (Reeve, 1852)
- Species Helix aulopis W. H. Benson, 1863 accepted as Tanychlamys aulopis (W. H. Benson, 1863)
- Species Helix aurata G. B. Sowerby I, 1841 accepted as Pfeifferia aurata (G. B. Sowerby I, 1841)
- Species Helix aurea Dillwyn, 1817 accepted as Amphidromus perversus var. aureus (Dillwyn, 1817)
- Species Helix aurea Rosen, 1911 accepted as Circassina frutis veselyi (Frankenberger, 1919)
- Species Helix aureliana Deshayes, 1863 † accepted as Megalotachea turonensis (Deshayes, 1832) †
- Species Helix auricoma A. Férussac, 1821 accepted as Zachrysia auricoma (A. Férussac, 1821)
- Species Helix auricularia Linnaeus, 1758 accepted as Radix auricularia (Linnaeus, 1758)
- Species Helix auriculata Swainson, 1820 accepted as Obba listeri auriculata (Swainson, 1820)
- Species Helix auriculata (Say, 1818) accepted as Daedalochila auriculata (Say, 1818)
- Species Helix auriculina Petit de la Saussaye, 1840 accepted as Labyrinthus leprieurii (Petit de la Saussaye, 1840)
- Species Helix auridens Rang, 1834 accepted as Pleurodonte auridens (Rang, 1834)
- Species Helix auriformis Bland, 1859 accepted as Daedalochila auriformis (Bland, 1859)
- Species Helix auris Reeve, 1854
- Species Helix aurisbovinus A. Férussac, 1821 accepted as Placostylus fibratus fibratus (Martyn, 1784)
- Species Helix auriscaprina A. Férussac, 1821 accepted as Plekocheilus glaber (Gmelin, 1791)
- Species Helix aurismalchi O. F. Müller, 1774 accepted as Placostylus fibratus fibratus (Martyn, 1784)
- Species Helix aurismuris S. Moricand, 1838 accepted as Cochlorina aurismuris (S. Moricand, 1838)
- Species Helix aurita E. von Martens, 1864
- Species Helix aurora L. Pfeiffer, 1863 accepted as Papuina aurora (L. Pfeiffer, 1863)
- Species Helix australis A. Férussac, 1821 accepted as Austrosuccinea australis (A. Férussac, 1821)
- Species Helix austriaca Menke, 1828 accepted as Caucasotachea vindobonensis (C. Pfeiffer, 1828)
- Species Helix austrinus Legrand, 1871 accepted as Mulathena fordei (Brazier, 1871)
- Species Helix avellanea A. Férussac, 1821 accepted as Coryda alauda (A. Férussac, 1821)
- Species Helix avidorum J. C. Cox, 1868
- Species Helix avus Reeve, 1852 accepted as Mesanella avus (Reeve, 1852)
- Species Helix ayresiana Newcomb, 1861 accepted as Helminthoglypta ayresiana (Newcomb, 1861)
- Species Helix aziospudasta Filhol, 1877 † accepted as Pseudoleptaxis aziospudasta (Filhol, 1877) †
- Species Helix azorica Albers, 1852 accepted as Leptaxis azorica (Albers, 1852)
- Species Helix babel A. Férussac, 1832 accepted as Limicolaria flammea (O. F. Müller, 1774)
- Species Helix babondubii L. Pfeiffer, 1842
- Species Helix bacca L. Pfeiffer, 1866 accepted as Satsuma bacca (L. Pfeiffer, 1866)
- Species Helix baconi W. H. Benson, 1850 accepted as Euplecta baconi (W. H. Benson, 1850)
- Species Helix bacterionides A. d'Orbigny, 1835 accepted as Obeliscus bacterionides (A. d'Orbigny, 1835)
- Species Helix bactriana T. Hutton, 1849 accepted as Hesseola bactriana (T. Hutton, 1849)
- Species Helix bactricola Guppy, 1868 accepted as Radioconus bactricolus (Guppy, 1868)
- Species Helix badia A. Férussac, 1832 accepted as Pleurodonte guadeloupensis (Pilsbry, 1889)
- Species Helix badia Gmelin, 1791
- Species Helix baetica Rossmässler, 1854 accepted as Sphincterochila baetica (Rossmässler, 1854)
- Species Helix baezensis Hidalgo, 1869 accepted as Happia baezensis (Hidalgo, 1869)
- Species Helix bahamensis L. Pfeiffer, 1845
- Species Helix bailloni Kobelt, 1888 accepted as Alabastrina (Guilia) bailloni (Kobelt, 1888)
- Species Helix bainbridgii L. Pfeiffer, 1845 accepted as Lucerna bainbridgii (L. Pfeiffer, 1845)
- Species Helix bajadera L. Pfeiffer, 1850 accepted as Ariophanta ammonia (Deshayes, 1850)
- Species Helix bakonicus Halaváts, 1902 † accepted as Megalotachea neumayri (Brusina, 1878) †
- Species Helix bala Brazier, 1878 accepted as Steorra bala (Brazier, 1878)
- Species Helix baladensis Souverbie, 1863 accepted as Platyrhytida baladensis (Souverbie, 1863)
- Species Helix balansai Morlet, 1886 accepted as Trachia balansai (Morlet, 1886)
- Species Helix balasteriana I. Lea, 1840 accepted as Dyakia janus (H. Beck, 1837)
- Species Helix balcanica L. Pfeiffer, 1853 accepted as Cattania balcanica (L. Pfeiffer, 1853)
- Species Helix balearica Rossmässler, 1838 accepted as Iberellus balearicus (Rossmässler, 1838)
- Species Helix balestieriana I. Lea, 1841 accepted as Helix balasteriana I. Lea, 1840
- Species Helix balmei Potiez & Michaud, 1838 accepted as Pleurodiscus balmei (Potiez & Michaud, 1838)
- Species Helix balstoni Angas, 1877 accepted as Kalidos balstoni (Angas, 1877)
- Species Helix balteata G. B. Sowerby I, 1841 accepted as Pachysphaera balteata (G. B. Sowerby I, 1841)
- Species Helix balteata Pollonera, 1892 accepted as Cernuella cisalpina (Rossmässler, 1837)
- Species Helix balthica Linnaeus, 1758 accepted as Ampullaceana balthica (Linnaeus, 1758)
- Species Helix banatica Rossmässler, 1838 accepted as Drobacia banatica (Rossmässler, 1838)
- Species Helix banneri L. Pfeiffer, 1863 accepted as Chloritisanax banneri (L. Pfeiffer, 1863)
- Species Helix bantamensis E. A. Smith, 1887 accepted as Ganesella bantamensis (E. A. Smith, 1887)
- Species Helix baphica Mabille, 1888 accepted as Aegista baphica (Mabille, 1888)
- Species Helix baracoensis L. Pfeiffer, 1856 accepted as Zachrysia baracoensis (L. Pfeiffer, 1856)
- Species Helix barbadensis Lamarck, 1822 accepted as Pleurodonte isabella (A. Férussac, 1822)
- Species Helix barbara Linnaeus, 1758 accepted as Cochlicella barbara (Linnaeus, 1758)
- Species Helix barbatula Reeve, 1852 accepted as Pulchridomus barbatula (Reeve, 1852)
- Species Helix barbella Servain, 1880 accepted as Oestophora barbella (Servain, 1880)
- Species Helix barbeyana De Stefani, 1891 †
- Species Helix barbigera Redfield, 1856 accepted as Stenotrema barbigerum (Redfield, 1856)
- Species Helix barbosella Heude, 1882 accepted as Plectotropis barbosella (Heude, 1882)
- Species Helix barbozae Paiva, 1866 accepted as Discula calcigena barbozae (Paiva, 1866)
- Species Helix barbula Rossmässler, 1838 accepted as Oestophora barbula (Rossmässler, 1838)
- Species Helix barceloi Hidalgo, 1878 accepted as Xerocrassa barceloi (Hidalgo, 1878)
- Species Helix barcinensis Bourguignat, 1868 accepted as Xerotricha madritensis (Rambur, 1868)
- Species Helix barcinensis Bourguignat, 1864 accepted as Xerotricha madritensis (Rambur, 1868)
- Species Helix barcinonensis Chia, 1886 accepted as Xerotricha barcinensis (Bourguignat, 1868)
- Species Helix barclayana L. Pfeiffer, 1847
- Species Helix barclayi W. H. Benson, 1850 accepted as Louisia barclayi (W. H. Benson, 1850)
- Species Helix baria Ancey, 1884
- Species Helix barkasi Liardet, 1876
- Species Helix barnaclei E. A. Smith, 1877 accepted as Megalacron alfredi (J. C. Cox, 1871)
- Species Helix barneyana Westerlund, 1888
- Species Helix barrakporensis Reeve, 1852 accepted as Kaliella barrakporensis (Reeve, 1852)
- Species Helix barrandii Deshayes, 1863 † accepted as Cepaea moroguesi (Brongniart, 1810) †
- Species Helix barrenensis Petterd, 1879 accepted as Insularopa barrenensis (Petterd, 1879)
- Species Helix barreri Bourguignat, 1881 † accepted as Praeoestophorella barreri (Bourguignat, 1881) †
- Species Helix bartayresii Noulet, 1854 †
- Species Helix basalis Pilsbry, 1890 accepted as Marilynessa yulei (Forbes, 1852)
- Species Helix bascauda W. H. Benson, 1859 accepted as Rahula bascauda (W. H. Benson, 1859)
- Species Helix basidens Mousson, 1873 accepted as Isomeria basidens (Mousson, 1873)
- Species Helix basidentata L. Pfeiffer, 1857 accepted as Obba basidentata (L. Pfeiffer, 1857)
- Species Helix basilessa W. H. Benson, 1865 accepted as Ariophanta basilessa (W. H. Benson, 1865)
- Species Helix basileus W. H. Benson, 1861 accepted as Ariophanta basileus (W. H. Benson, 1861)
- Species Helix basiodon Morelet, 1866 accepted as Fanulena insculpta (L. Pfeiffer, 1846)
- Species Helix baskervillei L. Pfeiffer, 1850 accepted as Cryptomastix devia (A. Gould, 1846)
- Species Helix batanica A. Adams & Reeve, 1850 accepted as Pancala batanica (A. Adams & Reeve, 1850)
- Species Helix batanica Reeve, 1851 accepted as Helicostyla volubilis (Reeve, 1851)
- Species Helix bataviana L. Pfeiffer, 1842 accepted as Elaphroconcha bataviana (L. Pfeiffer, 1842)
- Species Helix batchianensis L. Pfeiffer, 1861
- Species Helix batesii L. Pfeiffer, 1860
- Species Helix bathmophora Mabille, 1887 accepted as Camaena gabriellae (Dautzenberg & d'Hammonville, 1887)
- Species Helix bathmophorella Mabille, 1889 accepted as Camaena choboensis (Mabille, 1889)
- Species Helix bathycampa Mabille, 1883 accepted as Hemicycla sarcostoma (P. B. Webb & S. Berthelot, 1833)
- Species Helix bathyclera Mabille, 1883
- Species Helix bathycoma Mabille, 1882 accepted as Hemicycla ethelema (Mabille, 1882)
- Species Helix bathyomphala L. Pfeiffer, 1848 accepted as Candidula spadae (Calcara, 1845)
- Species Helix bathytera Blanc, 1879 accepted as Pseudoxerophila bathytera (Blanc, 1879)
- Species Helix baudoni Petit de la Saussaye, 1853 accepted as Zophos baudoni (Petit de la Saussaye, 1853)
- Species Helix bavayi Crosse & Marie, 1868 accepted as Monomphalus bavayi (Crosse & Marie, 1868)
- Species Helix bayamensis L. Pfeiffer, 1854 accepted as Zachrysia bayamensis (L. Pfeiffer, 1854)
- Species Helix bazini Crosse, 1874 accepted as Andrefrancia bazini (Crosse, 1874)
- Species Helix beatricis Tapparone Canefri, 1883 accepted as Sulcobasis beatricis (Tapparone Canefri, 1883)
- Species Helix beatrix Angas, 1876 accepted as Papuina meta (L. Pfeiffer, 1856)
- Species Helix beaumieri Mousson, 1873 accepted as Loxana beaumieri (Mousson, 1874)
- Species Helix beaumontii Matheron, 1843 † accepted as Helix aquensis de Serres, 1829 †
- Species Helix bebias Brazier, 1878 accepted as Steorra cookensis (Brazier, 1875)
- Species Helix becasis Rambur, 1868 accepted as Montserratina becasis (Rambur, 1868)
- Species Helix beckiana L. Pfeiffer, 1842 accepted as Trochomorpha beckiana (L. Pfeiffer, 1842)
- Species Helix beddomae Brazier, 1878 accepted as Gnarosophia bellendenkerensis (Brazier, 1875)
- Species Helix beddomeae Hanley, 1876 accepted as Corilla beddomeae (Hanley, 1876)
- Species Helix belangeri Deshayes, 1832 accepted as Ariophanta belangeri (Deshayes, 1832)
- Species Helix belcheri L. Pfeiffer, 1846
- Species Helix belemensis Servain, 1880 accepted as Xeroplexa belemensis (Servain, 1880)
- Species Helix belgrandi Bourguignat, 1869 † accepted as Perforatella bidentata (Gmelin, 1791)
- Species Helix bella Reeve, 1854
- Species Helix bellardii Mousson, 1854 accepted as Levantina bellardi (Mousson, 1854)
- Species Helix bellendenkerensis Brazier, 1875 accepted as Gnarosophia bellendenkerensis (Brazier, 1875)
- Species Helix bellengenensis Brazier, 1871 accepted as Austrochloritis bellengerensis (J. C. Cox, 1871)
- Species Helix bellengerensis J. C. Cox, 1871 accepted as Austrochloritis bellengerensis (J. C. Cox, 1871)
- Species Helix belli J. C. Cox, 1864 accepted as Macrophallikoropa belli (J. C. Cox, 1864)
- Species Helix bellula E. von Martens, 1892 accepted as Trochozonites bellulus (E. von Martens, 1892)
- Species Helix belmorei J. C. Cox, 1872 accepted as Trochomorpha belmorei (J. C. Cox, 1872)
- Species Helix bembicodes L. Pfeiffer, 1851 accepted as Helicobulinus bembicodes (L. Pfeiffer, 1851)
- Species Helix benigna L. Pfeiffer, 1863 accepted as Trochomorpha benigna (L. Pfeiffer, 1863)
- Species Helix bennetti Brazier, 1872 accepted as Pallidelix bennetti (Brazier, 1872)
- Species Helix bensoni von dem Busch, 1842 accepted as Chloritis delibrata (W. H. Benson, 1836)
- Species Helix beraudi Gassies, 1858 accepted as Ptychorhytida beraudi (Gassies, 1858)
- Species Helix berbruggeriana A. Letourneux, 1870
- Species Helix berendti L. Pfeiffer, 1861 accepted as Pycnogyra berendti (L. Pfeiffer, 1861)
- Species Helix berlierei Crosse, 1875 accepted as Andrefrancia berlierei (Crosse, 1875)
- Species Helix berlieri Morelet, 1857 accepted as Xeromunda berlieri (Morelet, 1857)
- Species Helix bermudensis L. Pfeiffer, 1845 accepted as Poecilozonites bermudensis (L. Pfeiffer, 1845)
- Species Helix bernardii Michaud, 1862 † accepted as Protodrepanostoma bernardii (Michaud, 1862) †
- Species Helix berthelini Deshayes, 1863 † accepted as Grandipatula berthelini (Deshayes, 1863) †
- Species Helix berthelotii A. d'Orbigny, 1836 accepted as Canariella berthelotii berthelotii (A. d'Orbigny, 1836)
- Species Helix bertholdiana L. Pfeiffer, 1852 accepted as Keraea bertholdiana (L. Pfeiffer, 1852)
- Species Helix bertiniana Tapparone Canefri, 1880 accepted as Ganesella bertiniana (Tapparone Canefri, 1880)
- Species Helix berytensis (L. Pfeiffer, 1841) accepted as Metafruticicola berytensis (L. Pfeiffer, 1841)
- Species Helix besckei Dunker, 1847 accepted as Happia (Prohappia) besckei (Dunker, 1847)
- Species Helix bestii W. H. Baily, 1858 † accepted as Helix duboisii W. H. Baily, 1858 †
- Species Helix beta L. Pfeiffer, 1853 accepted as Pulchridomus barbatulus [sic]
- Species Helix bethencourtiana Shuttleworth, 1852 accepted as Hemicycla bethencourtiana (Shuttleworth, 1852)
- Species Helix bevani Hedley, 1891 accepted as Claudettea bevani (Hedley, 1891)
- Species Helix bewsheriana Morelet, 1875 accepted as Dancea bewsheriana (Morelet, 1875)
- Species Helix beyrichi Deshayes, 1863 † accepted as Cepaea beyrichi (Deshayes, 1863) †
- Species Helix bianconii Deshayes, 1870 accepted as Discus pauper (A. Gould, 1859)
- Species Helix biangulata L. Pfeiffer, 1844 accepted as Vitrinula biangulata (L. Pfeiffer, 1844)
- Species Helix bicallosa L. Pfeiffer, 1853 accepted as Chilanodon bicallosa (L. Pfeiffer, 1853)
- Species Helix bicallosula Heude, 1886
- Species Helix bicarinata G. B. Sowerby I, 1824 accepted as Hystricella bicarinata (G. B. Sowerby I, 1824)
- Species Helix biciliata L. Pfeiffer, 1855 accepted as Ruthvenia biciliata (L. Pfeiffer, 1855)
- Species Helix bicincta Menke, 1830 accepted as Jeanneretia bicincta (Menke, 1830)
- Species Helix bicincta L. Pfeiffer, 1841 accepted as Leptarionta bicincta (L. Pfeiffer, 1841)
- Species Helix bicincta Benoit, 1843
- Species Helix biconcava L. Pfeiffer, 1853 accepted as Helix biconcava Reeve, 1852
- Species Helix biconcava Heude, 1882 accepted as Amphicoelina biconcava (Heude, 1882)
- Species Helix biconcava Reeve, 1852 accepted as Cavellia biconcava (Reeve, 1852)
- Species Helix biconvexa E. von Martens, 1864
- Species Helix bicostata L. Pfeiffer, 1846 accepted as Ventridens gularis (Say, 1821)
- Species Helix bicruris L. Pfeiffer, 1857 accepted as Linisa bicruris (L. Pfeiffer, 1857)
- Species Helix bidentalis Lamarck, 1822 accepted as Hemicycla bidentalis (Lamarck, 1822)
- Species Helix bidentata Gmelin, 1791 accepted as Perforatella bidentata (Gmelin, 1791)
- Species Helix bidenticulata W. H. Benson, 1852 accepted as Philalanka bidenticulata (W. H. Benson, 1852)
- Species Helix bidwilli Reeve, 1853 accepted as Papuexul bidwilli (Reeve, 1853)
- Species Helix bielzi E. A. Bielz, 1860 accepted as Edentiella bielzi (E. A. Bielz, 1860)
- Species Helix bifasciata Pulteney, 1799 accepted as Cochlicella acuta (O. F. Müller, 1774)
- Species Helix bifasciata (Burrow, 1815) accepted as Oxychona bifasciata (Burrow, 1815)
- Species Helix biforis Heude, 1885 accepted as Sinicola biforis (Heude, 1885)
- Species Helix bifoveata W. H. Benson, 1856 accepted as Chloritis bifoveata (W. H. Benson, 1856)
- Species Helix bifurcata sensu Reeve, 1852 accepted as Labyrinthus leprieurii (Petit de la Saussaye, 1840)
- Species Helix bifurcata Deshayes, 1838 accepted as Labyrinthus bifurcatus (Deshayes, 1838)
- Species Helix bigonia A. Férussac, 1823 accepted as Obba bigonia (A. Férussac, 1823)
- Species Helix bigoti Crosse, 1867 accepted as Macrochlamys renitens (Morelet, 1861)
- Species Helix bilabiata Olivi, 1792
- Species Helix bilamellata L. Pfeiffer, 1845 accepted as Pitys pagodiformis (E. A. Smith, 1892)
- Species Helix bilamellata G. B. Sowerby I, 1844 accepted as Helenodiscus bilamellatus (G. B. Sowerby I, 1844)
- Species Helix bilineata L. Pfeiffer, 1846 accepted as Mesomphix bilineatus (L. Pfeiffer, 1846)
- Species Helix bilirata W. T. Blanford & H. F. Blanford, 1861 accepted as Philalanka bilirata (W. T. Blanford & H. F. Blanford, 1861)
- Species Helix billeheusti Crosse & P. Fischer, 1864 accepted as Sitala billeheusti (Crosse & P. Fischer, 1864)
- Species Helix billiana Heude, 1882 accepted as Coccoglypta billiana (Heude, 1882)
- Species Helix bimaensis (Mousson, 1849) accepted as Asperitas bimaensis (Mousson, 1849)
- Species Helix binaria L. Pfeiffer, 1856 accepted as Endodonta binaria (L. Pfeiffer, 1856)
- Species Helix binaria E. von Martens, 1900 accepted as Fuellebornia sesquicincta (E. von Martens, 1900)
- Species Helix binisalemi L. M. Vidal, 1917 †
- Species Helix binneyana Pilsbry, 1899 accepted as Patera binneyana (Pilsbry, 1899)
- Species Helix binneyana L. Pfeiffer, 1847 accepted as Stephanoda binneyana (L. Pfeiffer, 1847)
- Species Helix binominata Tryon, 1887 accepted as Cryptomastix mullani hemphilli (W. G. Binney, 1886)
- Species Helix bintuanensis Hidalgo, 1890 accepted as Phoenicobius campanulus bintuanensis (Hidalgo, 1890)
- Species Helix biocheana Crosse, 1870 accepted as Helix (Geotrochus) hermione Angas, 1870
- Species Helix biomphala L. Pfeiffer, 1863 accepted as Chloritis biomphala (L. Pfeiffer, 1863)
- Species Helix bipartita A. Férussac, 1823 accepted as Hadra bipartita (A. Férussac, 1823)
- Species Helix bipartita Locard, 1899 accepted as Xerosecta promissa (Westerlund, 1892)
- Species Helix birmana L. Pfeiffer, 1857 accepted as Sarika birmana (L. Pfeiffer, 1857)
- Species Helix biscalpta Heude, 1885 accepted as Trichelix biscalpta (Heude, 1885)
- Species Helix bischoffensis Petterd, 1879 accepted as Bischoffena bischoffensis (Petterd, 1879)
- Species Helix bisculpta W. H. Benson, 1851 accepted as Trachycystis bisculpta (W. H. Benson, 1851)
- Species Helix bisulcata L. Pfeiffer, 1853
- Species Helix bitaeniata J. C. Cox, 1868 accepted as Sinumelon bitaeniatum (J. C. Cox, 1868)
- Species Helix bituberculata Reeve, 1852 accepted as Isomeria bituberculata (Reeve, 1852)
- Species Helix bituminosa Mabille, 1883 accepted as Hemicycla psathyra bituminosa (Mabille, 1883)
- Species Helix bizona Gredler, 1884
- Species Helix bizonalis Deshayes, 1850 accepted as Caracolus bizonalis (Deshayes, 1850)
- Species Helix bizonalis Grateloup, 1840 accepted as Coryda alauda (A. Férussac, 1821)
- Species Helix blackmani J. C. Cox, 1868 accepted as Calvigenia blackmani (J. C. Cox, 1868)
- Species Helix blainvillei Le Guillou, 1842 accepted as Papuina blainvillei (Le Guillou, 1842)
- Species Helix blainvilliana I. Lea, 1840 accepted as Hemiglypta blainvilliana (I. Lea, 1840)
- Species Helix blakeana Newcomb, 1865 accepted as Karaftohelix blakeana (Newcomb, 1865)
- Species Helix blakeana Tate, 1870 accepted as Chanomphalus tatei (Pilsbry, 1904)
- Species Helix blakei Kobelt, 1879 accepted as Ainohelix editha (A. Adams, 1868)
- Species Helix blanda J. C. Cox, 1873 accepted as Helix (Geotrochus) adonis Angas, 1870
- Species Helix blandiana C. B. Adams, 1850 accepted as Dialeuca blandiana (C. B. Adams, 1850)
- Species Helix blandingiana I. Lea, 1840 accepted as Gonaxis monrovia (Rang, 1831)
- Species Helix blanfordi Theobald, 1859 accepted as Oxytesta blanfordi (Theobald, 1859)
- Species Helix blasi Servain, 1880 accepted as Cernuella virgata (Da Costa, 1778)
- Species Helix bleicheri Paladilhe, 1875 accepted as Otala lactea (O. F. Müller, 1774)
- Species Helix blomfieldi J. C. Cox, 1864 accepted as Sphaerospira blomfieldi (J. C. Cox, 1864)
- Species Helix boa Hupé, 1857 accepted as Helix pellisboae Hupé, 1853
- Species Helix bocageana Crosse, 1864 accepted as Bradybaena bocageana (Crosse, 1864)
- Species Helix bocconiana Benoit, 1859 accepted as Lauria cylindracea (Da Costa, 1778)
- Species Helix bocourti Morelet, 1875 accepted as Sarika bocourti (Morelet, 1875)
- Species Helix bofilliana Fagot, 1884 accepted as Montserratina bofilliana (Fagot, 1884)
- Species Helix boghariensis Debeaux, 1857 accepted as Eobania constantina (E. Forbes, 1838)
- Species Helix bogotensis Reeve, 1854 accepted as Labyrinthus otostomus bogotensis (Reeve, 1854)
- Species Helix boholensis L. Pfeiffer, 1846 accepted as Vitrinula boholensis (L. Pfeiffer, 1846)
- Species Helix boissieri Charpentier, 1847 accepted as Sphincterochila zonata zonata (Bourguignat, 1853)
- Species Helix boissieri S. Moricand, 1846 accepted as Simpulopsis boissieri (S. Moricand, 1846)
- Species Helix boissyi Terver, 1839
- Species Helix boivinii Petit de la Saussaye, 1841 accepted as Megalacron boivini (Petit de la Saussaye, 1841)
- Species Helix bolenensis Locard, 1882 accepted as Helicella bolenensis (Locard, 1882)
- Species Helix bolivari Royo Gómez, 1922 † accepted as Iberus bolivari (Royo Gómez, 1922) †
- Species Helix bolivarii A. d'Orbigny, 1835 accepted as Drymaeus bolivarii (A. d'Orbigny, 1835)
- Species Helix bollei Albers, 1854 accepted as Leptaxis bollei (Albers, 1854)
- Species Helix bolus W. H. Benson, 1856 accepted as Helix (Dorcasia) bolus W. H. Benson, 1856
- Species Helix bombax W. H. Benson, 1859 accepted as Haploptychius bombax (W. H. Benson, 1859)
- Species Helix bombayana Grateloup, 1840 accepted as Ariophanta bombayana (Grateloup, 1840)
- Species Helix bombycina Reeve, 1854 accepted as Tasmaphena sinclairi (L. Pfeiffer, 1845)
- Species Helix bombycina L. Pfeiffer, 1855 accepted as Helix bombycina Reeve, 1854
- Species Helix bonduelliana Bourguignat, 1863 accepted as Eobania vermiculata (O. F. Müller, 1774)
- Species Helix bononiensis De Stefani, 1883 accepted as Cernuella neglecta (Draparnaud, 1805)
- Species Helix bonplandii Lamarck, 1822
- Species Helix boothiana L. Pfeiffer, 1839 accepted as Hojeda boothiana (L. Pfeiffer, 1839)
- Species Helix borbonica Deshayes, 1863 accepted as Bradybaena similaris (A. Férussac, 1822)
- Species Helix borealis Mousson, 1859
- Species Helix borellii Paravicini, 1894
- Species Helix bornii Pfeiffer, 1846 accepted as Caracolus marginella (Gmelin, 1791)
- Species Helix boryana Morelet, 1875 accepted as Caldwellia angularis (A. Férussac, 1821)
- Species Helix boscae Hidalgo, 1869 accepted as Suboestophora boscae (Hidalgo, 1869)
- Species Helix bosciana A. Férussac, 1832 accepted as Oxychona bosciana (A. Férussac, 1832)
- Species Helix boskovichi Dainelli, 1901 †
- Species Helix botterii L. Pfeiffer, 1853 accepted as Vitrea botterii (L. Pfeiffer, 1853)
- Species Helix bottinii Sacco, 1884 † accepted as Schlickumia bottinii (Sacco, 1884) †
- Species Helix boubetiana de Serres, 1844 † accepted as Galactochiloides nemoralites (Boubée, 1831) †
- Species Helix boucardi Angas, 1878 accepted as Leptarionta costaricensis (L. Pfeiffer, 1856)
- Species Helix boucheporni Noulet, 1868 †
- Species Helix boucheriana Mortillet, 1863 †
- Species Helix bougainvillei L. Pfeiffer, 1860 accepted as Quirosena bougainvillei (L. Pfeiffer, 1860)
- Species Helix bouilletii de Boissy, 1840 † accepted as Pachycarocollina bouilletii (de Boissy, 1840) †
- Species Helix bounoboena A. d'Orbigny, 1835 accepted as Scolodonta bounobaena (A. d'Orbigny, 1835)
- Species Helix bourailensis Gassies, 1872 accepted as Andrefrancia bourailensis (Gassies, 1872)
- Species Helix bourcieri Reeve, 1852 accepted as Isomeria bourcieri (Reeve, 1852)
- Species Helix bourguignati L. Pfeiffer, 1857
- Species Helix bouvieri Morelet, 1873 accepted as Keraea gorgonarum (Dohrn, 1869)
- Species Helix bouyei Crosse & P. Fischer, 1863 accepted as Sesara bouyei (Crosse & P. Fischer, 1863)
- Species Helix boxalli G. B. Sowerby III, 1888
- Species Helix boyeri Noulet, 1868 † accepted as Parachloraea albigensis (Noulet, 1854) †
- Species Helix boyerii P. Fischer & Bernardi, 1857 accepted as Megalacron boyerii (P. Fischer & Bernardi, 1857)
- Species Helix brachyodon G. B. Sowerby I, 1841 accepted as Phoenicobius brachyodon (G. B. Sowerby I, 1841)
- Species Helix brachysoma A. d'Orbigny, 1835 accepted as Drymaeus brachysoma (A. d'Orbigny, 1835)
- Species Helix bracteola A. Férussac, 1821 accepted as Lacteoluna selenina (A. Gould, 1848)
- Species Helix brandtii Kobelt, 1875 accepted as Euhadra brandtii (Kobelt, 1875)
- Species Helix brardiana Reeve, 1852 accepted as Bradybaena similaris (A. Férussac, 1822)
- Species Helix brasiliana Deshayes, 1832 accepted as Solaropsis brasiliana (Deshayes, 1832)
- Species Helix braunii Thomä, 1845 † accepted as Galactochiloides braunii (Thomä, 1845) †
- Species Helix brazierae Brazier, 1876 accepted as Canefriula brazierae (Brazier, 1876)
- Species Helix brazieri J. C. Cox, 1868 accepted as Elsothera brazieri (J. C. Cox, 1868)
- Species Helix brenchleyi Angas, 1879 accepted as Papuina walleri (Brazier, 1883)
- Species Helix brenskei O. Boettger, 1883 accepted as Josephinella brenskei (O. Boettger, 1883)
- Species Helix brephoides A. d'Orbigny, 1835 accepted as Scholvienia brephoides (A. d'Orbigny, 1835)
- Species Helix brevibarbis L. Pfeiffer, 1859 accepted as Plectotropis brevibarbis (L. Pfeiffer, 1859)
- Species Helix brevidens G. B. Sowerby I, 1841 accepted as Dentichloritis brevidens (G. B. Sowerby I, 1841)
- Species Helix brevieri Bourguignat, 1884 accepted as Otala xanthodon (Anton, 1838)
- Species Helix brevipes Draparnaud, 1805 accepted as Daudebardia brevipes (Draparnaud, 1805)
- Species Helix brevipila L. Pfeiffer, 1849 accepted as Austrochloritis brevipila (L. Pfeiffer, 1849)
- Species Helix brevis C. B. Adams, 1849 accepted as Happiella brevis (C. B. Adams, 1849)
- Species Helix breviseta L. Pfeiffer, 1862 accepted as Trichochloritis breviseta (L. Pfeiffer, 1862)
- Species Helix breweri Newcomb, 1864 accepted as Zonitoides arboreus (Say, 1817)
- Species Helix briatextensis Noulet, 1868 †
- Species Helix bridgesii Newcomb, 1861 accepted as Helminthoglypta nickliniana bridgesii (Newcomb, 1861)
- Species Helix bridwilli Reeve, 1853 accepted as Papuexul bidwilli (Reeve, 1853)
- Species Helix brjanskii Rosen, 1914 accepted as Teberdinia flavolimbata (O. Boettger, 1883)
- Species Helix broadbenti Brazier, 1877 accepted as Kendallena broadbenti (Brazier, 1877)
- Species Helix brocchii F. Sandberger, 1872 † accepted as Mesodontopsis chaixii (Michaud, 1855) †
- Species Helix brocchii Jickeli, 1874
- Species Helix brocheri L. Pfeiffer, 1846 accepted as Polymita brocheri (L. Pfeiffer, 1856)
- Species Helix broderipi [sic] accepted as Chloraea broderipii (L. Pfeiffer, 1842)
- Species Helix broderipii L. Pfeiffer, 1842 accepted as Chloraea broderipii (L. Pfeiffer, 1842)
- Species Helix brodiei Brazier, 1872 accepted as Papuina brodiei (Brazier, 1872)
- Species Helix brongniarti Deshayes, 1863 † accepted as Cepaea moroguesi (Brongniart, 1810) †
- Species Helix bronni L. Pfeiffer, 1846 accepted as Dentellaria bronni (L. Pfeiffer, 1846)
- Species Helix brookei A. Adams & Reeve, 1850 accepted as Exrhysota brookei (A. Adams & Reeve, 1850)
- Species Helix brotii Bonnet, 1864
- Species Helix broughami Angas, 1875 accepted as Cupedora broughami (Angas, 1875)
- Species Helix browneana L. Pfeiffer, 1862 accepted as Dentellaria tridentina (A. Férussac, 1832)
- Species Helix browningii W. H. Benson, 1864 accepted as Lyrocystis prionacis (W. H. Benson, 1864)
- Species Helix brucei Jickeli, 1874 accepted as Punctum brucei (Jickeli, 1874)
- Species Helix bruguieriana L. Pfeiffer, 1845 accepted as Anixa bruguieriana (L. Pfeiffer, 1845)
- Species Helix brumalis Morelet & Drouët, 1857 accepted as Oxychilus volutella (L. Pfeiffer, 1856)
- Species Helix brumeriensis Forbes, 1851 accepted as Letitia brumeriensis (Forbes, 1851)
- Species Helix brundusiana Fagot, 1884 accepted as Cernuella cisalpina (Rossmässler, 1837)
- Species Helix bruneri Ancey, 1881 accepted as Oreohelix haydeni bruneri (Ancey, 1881)
- Species Helix bruniana Gassies, 1872
- Species Helix brunnea Anton, 1838 accepted as Hiona glandula (H. Beck, 1838)
- Species Helix brunnea G. B. Sowerby I, 1841 accepted as Calocochlea melanocheila (Grateloup, 1840)
- Species Helix brunonia R. M. Johnston, 1888 accepted as Chloritobadistes victoriae (J. C. Cox, 1868)
- Species Helix brunonis Kobelt, 1894 accepted as Pyrochilus brunonis (Kobelt, 1894)
- Species Helix brusinae Dainelli, 1901 †
- Species Helix bryani L. Pfeiffer, 1862
- Species Helix bryophila R. A. Philippi, 1855 accepted as Radiodiscus bryophila (R. A. Philippi, 1855)
- Species Helix buccinella Reeve, 1852 accepted as Cavellia buccinella (Reeve, 1852)
- Species Helix bucculenta A. Gould, 1848 accepted as Mesodon thyroidus (Say, 1817)
- Species Helix bucheti Mabille, 1898 accepted as Xerotricha apicina (Lamarck, 1822)
- Species Helix buchii Dubois de Montpéreux, 1840
- Species Helix buddiana C. B. Adams, 1851 accepted as Zaphysema buddianum (C. B. Adams, 1851)
- Species Helix buffoniana L. Pfeiffer, 1845 accepted as Humboldtiana buffoniana (L. Pfeiffer, 1845)
- Species Helix bukobae E. von Martens, 1895 accepted as Halolimnohelix bukobae (E. von Martens, 1895)
- Species Helix bulacanensis Hidalgo, 1888 accepted as Obba bulacanensis (Hidalgo, 1888)
- Species Helix bulbina Deshayes, 1850 accepted as Allogona profunda (Say, 1821)
- Species Helix bulbulus F. Sandberger, 1873 † accepted as Pseudoleptaxis bulbulus (F. Sandberger, 1873) †
- Species Helix bulbulus L. Pfeiffer, 1853 accepted as Tricheulota bulbulus (L. Pfeiffer, 1853)
- Species Helix bulbus Mousson, 1849 accepted as Helix bulbulus L. Pfeiffer, 1853
- Species Helix buliminoides Heude, 1882 accepted as Pseudobuliminus buliminoides (Heude, 1882)
- Species Helix buliminus Heude, 1882 accepted as Pseudobuliminus buliminus (Heude, 1882)
- Species Helix bulla L. Pfeiffer, 1843 accepted as Lamarckiella bulla (L. Pfeiffer, 1843)
- Species Helix bullacea Reeve, 1854 accepted as Terrycarlessia bullacea (Reeve, 1854)
- Species Helix bullaoides Donovan, 1803 accepted as Physa fontinalis (Linnaeus, 1758)
- Species Helix bullula W. H. Benson, 1838 accepted as Kaliella bullula (W. H. Benson, 1838)
- Species Helix bulverii W. Wood, 1828 accepted as Callina bulverii (W. Wood, 1828)
- Species Helix bursatella A. Gould, 1846 accepted as Libera bursatella (A. Gould, 1846)
- Species Helix burtini Deshayes, 1874 accepted as Acusta ravida burtini (Deshayes, 1874)
- Species Helix busbyii J. E. Gray, 1840 accepted as Paryphanta busbyi (J. E. Gray, 1840)
- Species Helix buschi L. Pfeiffer, 1846 accepted as Helicostyla buschi (L. Pfeiffer, 1846)
- Species Helix bussacona Castro, 1887 accepted as Plagyrona placida (Shuttleworth, 1852)
- Species Helix bustoi Hidalgo, 1887 accepted as Obba bustoi (Hidalgo, 1887)
- Species Helix butleri L. Pfeiffer, 1842 accepted as Orthostylus butleri (L. Pfeiffer, 1842)
- Species Helix buttoni Petterd, 1879 accepted as Helicarion cuvieri A. Férussac, 1821
- Species Helix butumbiana E. von Martens, 1895 accepted as Prositala butumbiana (E. von Martens, 1895)
- Species Helix buvignieri Deshayes, 1874 accepted as Pliocathaica buvignieri (Deshayes, 1874)
- Species Helix buvinieri Michaud, 1841 accepted as Oestophorella buvinieri (Michaud, 1841)
- Species Helix buxina Heude, 1886
- Species Helix byronii W. Wood, 1828 accepted as Achatinella byronii (W. Wood, 1828)
- Species Helix cabriti Gassies, 1863 accepted as Diplomphalus cabriti (Gassies, 1863)
- Species Helix cacopera Mabille, 1883
- Species Helix cacoplasta Mabille, 1882 accepted as Hemicycla glyceia (Mabille, 1882)
- Species Helix cactorum A. d'Orbigny, 1835 accepted as Bostryx hennahi (J. E. Gray, 1828)
- Species Helix cacuminifera W. H. Benson, 1850 accepted as Euplecta cacuminifera (W. H. Benson, 1850)
- Species Helix caduca L. Pfeiffer, 1846 †
- Species Helix caducior Reeve, 1851 accepted as Lamarckiella stolephora caducior (Reeve, 1851)
- Species Helix cadurcensis Noulet, 1854 † accepted as Parachloraea albigensis (Noulet, 1854) †
- Species Helix caeca Guppy, 1868 accepted as Pupisoma dioscoricola (C. B. Adams, 1845)
- Species Helix caecilia L. Pfeiffer, 1855
- Species Helix caecoides Tate, 1870 accepted as Lyroconus caecoides (Tate, 1870)
- Species Helix caelatura A. Férussac, 1821
- Species Helix caerulans C. Pfeiffer, 1828 accepted as Vidovicia caerulans (C. Pfeiffer, 1828)
- Species Helix caerulescens Gmelin, 1791 † accepted as Hydrobia caerulescens (Gmelin, 1791) †
- Species Helix caesareana Mousson, 1854 accepted as Levantina caesareana (Mousson, 1854)
- Species Helix cafra A. Férussac, 1821 accepted as Natalina cafra (A. Férussac, 1821)
- Species Helix cailleti Crosse, 1864 accepted as Pommerhelix monacha (L. Pfeiffer, 1859)
- Species Helix cailliaudi Deshayes, 1839 accepted as Calocochlea cailliaudi (Deshayes, 1839)
- Species Helix cairensis Mayer-Eymar, 1889 † accepted as Leucochroa cairensis (Mayer-Eymar, 1889) †
- Species Helix calabarica L. Pfeiffer, 1857 accepted as Trochonanina calabarica (L. Pfeiffer, 1857)
- Species Helix calabrica Westerlund, 1876
- Species Helix calamechroa Jonas, 1843 accepted as Saphtia calamechroa (Jonas, 1843)
- Species Helix calathoides R. T. Lowe, 1863 accepted as Atlantica calathoides (R. T. Lowe, 1863)
- Species Helix calathus R. T. Lowe, 1852 accepted as Janulus calathus R. T. Lowe, 1852
- Species Helix calcar E. von Martens, 1864 accepted as Obba calcar (E. von Martens, 1864)
- Species Helix calcarata Benoit, 1862 accepted as Trochoidea spratti (L. Pfeiffer, 1846)
- Species Helix calcarea L. Pfeiffer, 1849 accepted as Theba pisana pisana (O. F. Müller, 1774)
- Species Helix calcarea Born, 1778 accepted as Neobeliscus calcareus (Born, 1778)
- Species Helix calcarina Ancey, 1884
- Species Helix calculosa A. Gould, 1852 accepted as Coneuplecta calculosa (A. Gould, 1852)
- Species Helix calculus Heude, 1885 accepted as Helix lithina Heude, 1885
- Species Helix calculus L. Pfeiffer, 1854
- Species Helix caldeirarum Morelet & Drouët, 1857 accepted as Leptaxis caldeirarum (Morelet & Drouët, 1857)
- Species Helix caldwelli W. H. Benson, 1859 accepted as Ctenophila caldwelli (W. H. Benson, 1859)
- Species Helix caledonica Crosse, 1868 accepted as Micromphalia caledonica (Crosse, 1868)
- Species Helix calias W. H. Benson, 1859 accepted as Sophina calias (W. H. Benson, 1859)
- Species Helix californiensis I. Lea, 1838 accepted as Helminthoglypta californiensis (I. Lea, 1838)
- Species Helix caliginosa A. Adams & Reeve, 1850 accepted as Satsuma caliginosa (A. Adams & Reeve, 1850)
- Species Helix callestha Berenguier, 1884 accepted as Candidula unifasciata acosmia (Bourguignat, 1882)
- Species Helix callifera L. Pfeiffer, 1850 accepted as Hiona callifera (L. Pfeiffer, 1850)
- Species Helix calligera Dubois de Montpéreux, 1840 accepted as Caucasotachea atrolabiata calligera (Dubois de Montpéreux, 1840)
- Species Helix calliope Crosse, 1869 accepted as Andrefrancia calliope (Crosse, 1869)
- Species Helix calliostoma A. Adams & Reeve, 1948 accepted as Theba subdentata helicella (W. Wood, 1828)
- Species Helix callipona Mabille, 1882 accepted as Hemicycla bidentalis (Lamarck, 1822)
- Species Helix callisona Locard, 1899 accepted as Candidula olisippensis (Servain, 1880)
- Species Helix callizona Crosse, 1871 accepted as Euhadra callizona (Crosse, 1871)
- Species Helix callosa Anton, 1838
- Species Helix calomorpha Jonas, 1839
- Species Helix calpeana Morelet, 1854 accepted as Oestophora calpeana (Morelet, 1854)
- Species Helix calpis W. H. Benson, 1859 accepted as Streptaulus blanfordi W. H. Benson, 1857
- Species Helix calva A. Gould, 1846 accepted as Nanina casca A. Gould, 1852
- Species Helix calva R. T. Lowe, 1831 accepted as Caseolus calvus (R. T. Lowe, 1831)
- Species Helix calymma Schmacker & O. Boettger, 1894
- Species Helix calypso L. Pfeiffer, 1862 accepted as Ampelita calypso (L. Pfeiffer, 1862)
- Species Helix calypso Benoit, 1859 accepted as Marmorana globularis eugeniae (L. Pfeiffer, 1853)
- Species Helix calyptogyra Filhol, 1877 † accepted as Eurystrophe filholi (Bourguignat, 1874) †
- Species Helix cambojiensis Reeve, 1860 accepted as Bertia cambojiensis (Reeve, 1860)
- Species Helix camelina Bourguignat, 1852 accepted as Oxychilus camelinus (Bourguignat, 1852)
- Species Helix camelus L. Pfeiffer, 1855 accepted as Obba camelus (L. Pfeiffer, 1855)
- Species Helix camerani Lessona, 1880 accepted as Falkneria camerani (Lessona, 1880)
- Species Helix camerunensis d'Ailly, 1896
- Species Helix campanea Bourguignat, 1881 † accepted as Hemicycla asperula leymerieana (Noulet, 1854) †
- Species Helix campanula L. Pfeiffer, 1845 accepted as Phoenicobius campanulus (L. Pfeiffer, 1845)
- Species Helix campanyonii Rossmässler, 1839 accepted as Iberellus campanyonii (Rossmässler, 1839)
- Species Helix campbellica Filhol, 1880 accepted as Taguahelix campbellica (Filhol, 1880)
- Species Helix campbellii J. E. Gray, 1834 accepted as Advena campbellii (J. E. Gray, 1834)
- Species Helix campelica Mabille, 1886
- Species Helix campesina L. Pfeiffer, 1846 accepted as Iberus campesinus (L. Pfeiffer, 1846)
- Species Helix camura W. H. Benson, 1859 accepted as Macrochlamys camura (W. H. Benson, 1859)
- Species Helix canalifera Anton, 1838 accepted as Lindholmiola corcyrensis (Rossmässler, 1838)
- Species Helix canalis (Montagu, 1803) accepted as Lacuna vincta (Montagu, 1803)
- Species Helix canariensis Mousson, 1872 accepted as Cernuella virgata (Da Costa, 1778)
- Species Helix candaharica L. Pfeiffer, 1846 accepted as Xeropicta candaharica (L. Pfeiffer, 1846)
- Species Helix candeloti Crosse & Marie, 1868 accepted as Ptychorhytida candeloti (Crosse & Marie, 1868)
- Species Helix candescens C. B. Adams, 1850 accepted as Dentellaria candescens (C. B. Adams, 1850)
- Species Helix candicans L. Pfeiffer, 1841 accepted as Xerolenta obvia obvia (Menke, 1828)
- Species Helix candidissima Draparnaud, 1801 accepted as Sphincterochila candidissima (Draparnaud, 1801)
- Species Helix candiduloides Greppin, 1855 † accepted as Leucochroopsis kleinii (Klein, 1846) †
- Species Helix candidum S. Moricand, 1841
- Species Helix candiota L. Pfeiffer, 1849 accepted as Xeromunda candiota (L. Pfeiffer, 1849)
- Species Helix candisata L. Pfeiffer, 1846 accepted as Caseolus abjectus candisatus (L. Pfeiffer, 1846)
- Species Helix canescens A. Adams & Reeve, 1850 accepted as Xerarionta levis canescens (A. Adams & Reeve, 1850)
- Species Helix canina Ancey, 1888
- Species Helix canini Benoit, 1843 accepted as Oxychilus canini (Benoit, 1843)
- Species Helix canovarii Tapparone Canefri, 1883 accepted as Papuina canovarii (Tapparone Canefri, 1883)
- Species Helix canovasiana Servain, 1880 accepted as Cernuella virgata (Da Costa, 1778)
- Species Helix cantabrica Hidalgo, 1873 accepted as Pyrenaearia cantabrica (Hidalgo, 1873)
- Species Helix canthensis Beyrich, 1854 † accepted as Drobacia banatica (Rossmässler, 1838)
- Species Helix cantiana Montagu, 1803 accepted as Monacha (Monacha) cantiana (Montagu, 1803)
- Species Helix cantianiformis Ancey, 1884 accepted as Theba (Theba) cantiana (Montagu, 1803)
- Species Helix cantoriana W. H. Benson, 1861 accepted as Videna cantoriana (W. H. Benson, 1861)
- Species Helix capensis L. Pfeiffer, 1841 accepted as Xerocystis capensis (L. Pfeiffer, 1841)
- Species Helix caperata Montagu, 1803 accepted as Candidula intersecta (Poiret, 1801)
- Species Helix capessens W. H. Benson, 1856 accepted as Sesara infrendens (A. Gould, 1843)
- Species Helix capgrandi Noulet, 1854 † accepted as Tropidomphalus capgrandi (Noulet, 1854) †
- Species Helix capillacea A. Férussac, 1832 accepted as Austrorhytida capillacea (A. Férussac, 1832)
- Species Helix capillacea L. Pfeiffer, 1842 accepted as Mesomphix cupreus (Rafinesque, 1831)
- Species Helix capillata Pease, 1866 accepted as Nesophila capillata (Pease, 1866)
- Species Helix capitanea Reeve, 1854 accepted as Asperitas trochus (O. F. Müller, 1774)
- Species Helix capitium W. H. Benson, 1848 accepted as Ganesella capitium (W. H. Benson, 1848)
- Species Helix capnodes W. G. Binney, 1857 accepted as Mesomphix capnodes (W. G. Binney, 1857)
- Species Helix capsella A. Gould, 1851 accepted as Paravitrea capsella (A. Gould, 1851)
- Species Helix capsula W. H. Benson, 1864 accepted as Sheldonia capsula (W. H. Benson, 1864)
- Species Helix capucinus A. Férussac, 1835 accepted as Sphaerospira fraseri (J. E. Gray, 1833)
- Species Helix caputspinulae Reeve, 1852 accepted as Paralaoma caputspinulae (Reeve, 1852)
- Species Helix cara C. B. Adams, 1849 accepted as Dentellaria cara (C. B. Adams, 1849)
- Species Helix carabinata A. Férussac, 1821 accepted as Corilla carabinata (A. Férussac, 1821)
- Species Helix carascalensis Michaud, 1831 accepted as Pyrenaearia carascalensis (Michaud, 1831)
- Species Helix carascaloides Bourguignat, 1855 accepted as Monacha carascaloides (Bourguignat, 1855)
- Species Helix carascalopsis Fagot, 1884 accepted as Pyrenaearia carascalopsis (Fagot, 1884)
- Species Helix carbonaria L. Pfeiffer, 1842 accepted as Anixa carbonaria (L. Pfeiffer, 1842)
- Species Helix carcharias L. Pfeiffer, 1864 accepted as Plectorhagada carcharias (L. Pfeiffer, 1864)
- Species Helix carcusiaca Mabille, 1881 accepted as Xeroplexa intersecta (Poiret, 1801)
- Species Helix cardiobola Mabille, 1882 † accepted as Hemicycla cardiobola (Mabille, 1882) †
- Species Helix cardiostoma Kobelt, 1879 accepted as Satsuma cardiostoma (Kobelt, 1879)
- Species Helix cardonae Hidalgo, 1867 accepted as Xerocrassa nyeli (Mittre, 1842)
- Species Helix caribaea Weinland, 1862 accepted as Hemitrochus gallopavonis (L. Pfeiffer, 1842)
- Species Helix carica J. R. Roth, 1839 accepted as Zonites caricus (J. R. Roth, 1839)
- Species Helix carinata Hombron & Jacquinot, 1841 accepted as Papuina juttingae Mienis, 1993
- Species Helix carinata Link, 1807
- Species Helix carinulata Klein, 1853 † accepted as Leucochroopsis kleinii (Klein, 1846) †
- Species Helix cariosa Olivier, 1804 accepted as Sphincterochila cariosa (Olivier, 1804)
- Species Helix cariosula Michaud, 1833 accepted as Sphincterochila cariosula (Michaud, 1833)
- Species Helix carmeliensis L. Pfeiffer, 1861
- Species Helix carmelita A. Férussac, 1821 accepted as Lucerna mora (J. E. Gray, 1833)
- Species Helix carmelita Tristram, 1865 accepted as Monacha crispulata (Mousson, 1861)
- Species Helix carneola Reeve, 1854
- Species Helix carnicolor L. Pfeiffer, 1841 accepted as Hemitrochus varians (Menke, 1829)
- Species Helix carocolla Linnaeus, 1758 accepted as Caracolus carocolla (Linnaeus, 1758)
- Species Helix caroli Dohrn & Heynemann, 1862 accepted as Xerocrassa caroli (Dohrn & Heynemann, 1862)
- Species Helix caroliniensis I. Lea, 1831 accepted as Xolotrema caroliniense (I. Lea, 1831)
- Species Helix carolus Deshayes, 1861 accepted as Helicobulinus carolus (Deshayes, 1861)
- Species Helix caroni Deshayes, 1832 accepted as Trochoidea caroni (Deshayes, 1832)
- Species Helix carotii Paulucci, 1882 accepted as Tacheocampylaea carotii (Paulucci, 1882)
- Species Helix carpalima Mabille, 1889
- Species Helix carpenteri Newcomb, 1861 accepted as Helminthoglypta carpenteri (Newcomb, 1861)
- Species Helix carpenteriana Bland, 1860 accepted as Polygyra cereolus (Megerle von Mühlfeld, 1818)
- Species Helix carryensis A. d'Orbigny, 1852 † accepted as Megalotachea turonensis (Deshayes, 1832) †
- Species Helix carseolana [sic] accepted as Marmorana signata carsoliana (A. Férussac, 1821)
- Species Helix carsoliana A. Férussac, 1821 accepted as Marmorana signata carsoliana (A. Férussac, 1821)
- Species Helix carta Mabille, 1882 † accepted as Hemicycla saulcyi carta (Mabille, 1882) †
- Species Helix cartaxensis Roman, 1907 † accepted as Theba cartaxensis (Roman, 1907) †
- Species Helix cartereti E. A. Smith, 1884 accepted as Hemiplecta cartereti (E. A. Smith, 1884)
- Species Helix carteriensis Quoy & Gaimard, 1832 accepted as Partula grisea R. P. Lesson, 1831
- Species Helix carthaginiensis Rossmässler, 1853 accepted as Iberus carthaginiensis (Rossmässler, 1853)
- Species Helix carthusiana [sic] accepted as Monacha cartusiana (O. F. Müller, 1774)
- Species Helix cartusiana O. F. Müller, 1774 accepted as Monacha cartusiana (O. F. Müller, 1774)
- Species Helix caruanae Kobelt, 1888 accepted as Cernuella caruanae (Kobelt, 1888)
- Species Helix caseus L. Pfeiffer, 1860 accepted as Chloritis caseus (L. Pfeiffer, 1860)
- Species Helix caspari Möllendorff, 1884 accepted as Euhadra caspari (Möllendorff, 1884)
- Species Helix cassida R. T. Lowe, 1831 accepted as Leiostyla cassida (R. T. Lowe, 1831)
- Species Helix cassidula W. H. Benson, 1859 accepted as Burmochlamys cassidula (W. H. Benson, 1859)
- Species Helix cassiquiensis L. Pfeiffer, 1853 accepted as Habroconus cassiquiensis (L. Pfeiffer, 1853)
- Species Helix casta L. Pfeiffer, 1849 accepted as Chloraea casta (L. Pfeiffer, 1849)
- Species Helix castanea Swainson, 1840 accepted as Cochlostyla frater (A. Férussac, 1821)
- Species Helix castanea Olivier, 1801 accepted as Helix lucorum Linnaeus, 1758
- Species Helix castelnaudii Deville & Hupé, 1850 accepted as Solaropsis castelnaudii (Deville & Hupé, 1850)
- Species Helix castertana Bourguignat, 1887 accepted as Cernuella cisalpina (Rossmässler, 1837)
- Species Helix castor Theobald, 1858 accepted as Oxytesta castor (Theobald, 1858)
- Species Helix castra W. H. Benson, 1852 accepted as Sivella castra (W. H. Benson, 1852)
- Species Helix castrensis L. Pfeiffer, 1857 accepted as Polydontes castrensis (L. Pfeiffer, 1857)
- Species Helix castroiana Servain, 1880 accepted as Cernuella virgata (Da Costa, 1778)
- Species Helix catagonia Bourguignat, 1881 † accepted as Hemicycla asperula leymerieana (Noulet, 1854) †
- Species Helix catantostoma F. Sandberger, 1872 † accepted as Apula catantostoma (F. Sandberger, 1872) †
- Species Helix catarella Mabille, 1884
- Species Helix catenifera Reeve, 1852 accepted as Solaropsis catenifera (Reeve, 1852)
- Species Helix cathcartae Reeve, 1854 accepted as Videnoida cathcartae (Reeve, 1854)
- Species Helix catinus W. H. Benson, 1859 accepted as Plectopylis cyclaspis (W. H. Benson, 1859)
- Species Helix catinus L. Pfeiffer, 1857
- Species Helix caucasica L. Pfeiffer, 1846
- Species Helix cauisa W. H. Benson, 1859 accepted as Burmochlamys cauisa (W. H. Benson, 1859)
- Species Helix causia W. H. Benson, 1859 accepted as Tanychlamys causia (W. H. Benson, 1859)
- Species Helix cavata Mousson, 1854 accepted as Helix engaddensis Bourguignat, 1852
- Species Helix cavernula Hombron & Jacquinot, 1847 accepted as Libera cavernula (Hombron & Jacquinot, 1847)
- Species Helix cavernula L. Pfeiffer, 1853 accepted as Libera streptaxon (Reeve, 1852)
- Species Helix cavimargo E. von Martens, 1879 accepted as Fruticicola cavimargo (E. von Martens, 1879)
- Species Helix cayennensis L. Pfeiffer, 1842 accepted as Systrophiella cayennensis (L. Pfeiffer, 1842)
- Species Helix cazenavetti Fischer & Bernardi, 1857 accepted as Ampelita lancula (A. Férussac, 1821)
- Species Helix cecillei R. A. Philippi, 1849 accepted as Euhadra cecillei (R. A. Philippi, 1849)
- Species Helix cedretorum Gassies, 1858
- Species Helix cellaria O. F. Müller, 1774 accepted as Oxychilus cellarius (O. F. Müller, 1774)
- Species Helix celtica Bourguignat, 1869 †
- Species Helix cenchridium Cossmann, 1902 † accepted as Acanthinula cenchridium (Cossmann, 1902) †
- Species Helix cenestinensis Crosse & Debeaux, 1869 accepted as Marmorana serpentina (A. Férussac, 1821)
- Species Helix cenomanensis Repelin, 1902 †
- Species Helix cepa O. F. Müller, 1774 accepted as Cepolis cepa (O. F. Müller, 1774)
- Species Helix cephalaeditana Giannuzzi-Savelli, Sparacio & Oliva, 1986 accepted as Cornu cephalaeditana (Giannuzzi-Savelli, Sparacio & Oliva, 1986)
- Species Helix cepoides I. Lea, 1840 accepted as Pachya cepoides (I. Lea, 1840)
- Species Helix ceralis J. C. Cox, 1873 accepted as Trochomorpha meleagris (L. Pfeiffer, 1855)
- Species Helix ceramensis L. Pfeiffer, 1861 accepted as Chloritis ceramensis (L. Pfeiffer, 1861)
- Species Helix ceraria W. H. Benson, 1853 accepted as Cryptozona ceraria (W. H. Benson, 1853)
- Species Helix cerata J. C. Cox, 1868 accepted as Bentosites coxi (Crosse, 1866)
- Species Helix ceratina Shuttleworth, 1843
- Species Helix ceratodes L. Pfeiffer, 1846 accepted as Pseudhelicarion ceratodes (L. Pfeiffer, 1846)
- Species Helix ceratomma L. Pfeiffer, 1855 accepted as Levantina ceratomma (L. Pfeiffer, 1855)
- Species Helix cerea L. Pfeiffer, 1851 accepted as Helix cosmia L. Pfeiffer, 1852
- Species Helix cerea J. C. Cox, 1864 accepted as Bentosites coxi (Crosse, 1866)
- Species Helix cerea A. Gould, 1850 accepted as Nanina cerea (A. Gould, 1850)
- Species Helix cerealis Crosse, 1868 accepted as Monomphalus cerealis (Crosse, 1868)
- Species Helix cereoflava M. Bielz, 1851 accepted as Helicopsis cereoflava (M. Bielz, 1851)
- Species Helix cereolus Megerle von Mühlfeld, 1818 accepted as Polygyra cereolus (Megerle von Mühlfeld, 1818)
- Species Helix ceres Reeve, 1853 accepted as Phoenicobius ceres (Reeve, 1853)
- Species Helix cerigottana O. Boettger, 1894 accepted as Metafruticicola redtenbacheri (L. Pfeiffer, 1856)
- Species Helix cerina Morelet, 1877 accepted as Eurystyla cerina (Morelet, 1877)
- Species Helix cerinoideus J. G. Anthony, 1865 accepted as Ventridens cerinoideus (J. G. Anthony, 1865)
- Species Helix cernua E. von Martens, 1889 accepted as Dorcasia cernua (E. von Martens, 1889)
- Species Helix ceroconus L. Pfeiffer, 1864 accepted as Trochomorpha ceroconus (L. Pfeiffer, 1864)
- Species Helix ceroides L. Pfeiffer, 1853
- Species Helix ceromatica Morelet, 1881 accepted as Tanychlamys ceromatica (Morelet, 1881)
- Species Helix ceryx W. H. Benson, 1859 accepted as Trochomorpha ceryx (W. H. Benson, 1859)
- Species Helix cespitum Draparnaud, 1801 accepted as Xerosecta cespitum (Draparnaud, 1801)
- Species Helix cestus W. H. Benson, 1836 accepted as Bradybaena cestus (W. H. Benson, 1836)
- Species Helix ceylanica L. Pfeiffer, 1850 accepted as Ariophanta bistrialis var. ceylanica (L. Pfeiffer, 1850)
- Species Helix chadiana Pallary, 1899
- Species Helix chaignoni Locard, 1883 † accepted as Helicigona chaignoni (Locard, 1883) †
- Species Helix chaixi [sic] † accepted as Mesodontopsis chaixii (Michaud, 1855) †
- Species Helix chaixii Michaud, 1855 † accepted as Mesodontopsis chaixii (Michaud, 1855) †
- Species Helix chalcidica E. von Martens, 1876
- Species Helix chalicophila A. d'Orbigny, 1835 accepted as Scolodonta chalicophila (A. d'Orbigny, 1835)
- Species Helix chamaeleon L. Pfeiffer, 1868 accepted as Arianta chamaeleon chamaeleon (L. Pfeiffer, 1868)
- Species Helix chamissoi L. Pfeiffer, 1855 accepted as Philonesia chamissoi (L. Pfeiffer, 1855)
- Species Helix chancei J. C. Cox, 1870 accepted as Papustyla chancei (J. C. Cox, 1870)
- Species Helix chapmani J. C. Cox, 1879 accepted as Letitia chapmani (J. C. Cox, 1879)
- Species Helix charpentieri Scholtz, 1843 accepted as Faustina faustina (Rossmässler, 1835)
- Species Helix charpentieri Reeve, 1854 accepted as Corilla adamsi Gude, 1914
- Species Helix charybdis W. H. Benson, 1856 accepted as Cyclocystis charybdis (W. H. Benson, 1856)
- Species Helix charybdis Mörch, 1852 accepted as Polygyratia polygyrata (Born, 1778)
- Species Helix chastellii A. Férussac, 1832 accepted as Kalidos chastellii (A. Férussac, 1832)
- Species Helix cheikliensis Zilch, 1952 accepted as Helix fathallae Nägele, 1901
- Species Helix cheilostropha A. d'Orbigny, 1835 accepted as Systrophia cheilostropha (A. d'Orbigny, 1835)
- Species Helix cheiri R. P. Lesson, 1831
- Species Helix chelonitis Crosse, 1868 accepted as Rhytidopsis chelonitis (Crosse, 1868)
- Species Helix chemnitziana L. Pfeiffer, 1845 accepted as Lucerna chemnitziana (L. Pfeiffer, 1845)
- Species Helix chemnitziana A. Férussac, 1821 accepted as Apoma chemnitzianum (A. Férussac, 1821)
- Species Helix chenui L. Pfeiffer, 1847 accepted as Cryptozona chenui (L. Pfeiffer, 1847)
- Species Helix cherifiana Pallary, 1899
- Species Helix cherrieri Bavay, 1908 accepted as Neocepolis merarcha (Mabille, 1888)
- Species Helix chersa Mabille, 1882 accepted as Hemicycla plicaria (Lamarck, 1816)
- Species Helix chersina Say, 1821 accepted as Euconulus chersinus (Say, 1821)
- Species Helix chertieri Deshayes, 1863 † accepted as Grandipatula chertieri (Deshayes, 1863) †
- Species Helix chevalierii Souleyet, 1842 accepted as Hemiplecta chevalieri (Souleyet, 1842)
- Species Helix chevallieri Cossmann, 1886 † accepted as Sagdellina chevallieri (Cossmann, 1886) †
- Species Helix chiae Fagot, 1886 accepted as Xerocrassa chiae (Fagot, 1886)
- Species Helix chiapensis L. Pfeiffer, 1856 accepted as Polygyra chiapensis (L. Pfeiffer, 1856)
- Species Helix chilhoweensis J. Lewis, 1871 accepted as Appalachina chilhoweensis (J. Lewis, 1871)
- Species Helix chimmoi L. Pfeiffer, 1857 accepted as Charopa chimmoi (L. Pfeiffer, 1857)
- Species Helix chinensis R. A. Philippi, 1845 accepted as Aegista chinensis (R. A. Philippi, 1845)
- Species Helix chionodiscus L. Pfeiffer, 1857
- Species Helix chittyana C. B. Adams, 1849 accepted as Dentellaria tridentina (A. Férussac, 1832)
- Species Helix chloritoides Pilsbry, 1891 accepted as Nannochloritis chloritoides (Pilsbry, 1891)
- Species Helix chlorochroa G. B. Sowerby I, 1841 accepted as Calocochlea chlorochroa (G. B. Sowerby I, 1841)
- Species Helix chloroplax W. H. Benson, 1865 accepted as Khasiella chloroplax (W. H. Benson, 1865)
- Species Helix chlorotica L. Pfeiffer, 1852 accepted as Zonites chloroticus (L. Pfeiffer, 1852)
- Species Helix chlorozona Grateloup, 1840 accepted as Ampelita chlorozona (Grateloup, 1840)
- Species Helix chnoodia Bourguignat, 1863 accepted as Schileykiella sordulenta (Morelet, 1851)
- Species Helix choboensis Mabille, 1889 accepted as Camaena choboensis (Mabille, 1889)
- Species Helix choinix W. H. Benson, 1861 accepted as Tanychlamys choinix (W. H. Benson, 1861)
- Species Helix choiseulensis Brazier, 1872 accepted as Papuina mendana choiseulensis (Brazier, 1872)
- Species Helix chordata L. Pfeiffer, 1861 accepted as Phenacohelix pilula (Reeve, 1852)
- Species Helix chottica Ancey, 1882
- Species Helix choukoutienensis Ping, 1929 † accepted as Zonitoides choukoutienensis (Ping, 1929) †
- Species Helix chriacorum T. D. A. Cockerell, 1914 †
- Species Helix christinae H. Adams, 1870 accepted as Laeocathaica christinae (H. Adams, 1870)
- Species Helix christolii Matheron, 1843 † accepted as Megalotachea christolii (Matheron, 1843) †
- Species Helix christophori Rosen, 1911 accepted as Fruticocampylaea christophori (Rosen, 1911)
- Species Helix christyi Bland, 1860 accepted as Fumonelix christyi (Bland, 1860)
- Species Helix chrysocheilus G. B. Sowerby I, 1841 accepted as Calocochlea chrysocheila (G. B. Sowerby I, 1841)
- Species Helix chrysomela L. Pfeiffer, 1846 † accepted as Leptaxis (Leptaxis) chrysomela (L. Pfeiffer, 1846) †
- Species Helix chrysosticta Morelet, 1867 accepted as Thapsia chrysosticta (Morelet, 1867)
- Species Helix chytrophora Mabille, 1887 accepted as Tonkinospira chytrophora (Mabille, 1887)
- Species Helix cicatrica Anton, 1838
- Species Helix cicatricosa O. F. Müller, 1774 accepted as Camaena cicatricosa (O. F. Müller, 1774)
- Species Helix cicercula L. Pfeiffer, 1848 accepted as Praticolella griseola (L. Pfeiffer, 1841)
- Species Helix cicercula A. Gould, 1846 accepted as Philonesia cicercula (A. Gould, 1846)
- Species Helix cidaris Lamarck, 1822 accepted as Asperitas trochus (O. F. Müller, 1774)
- Species Helix ciliata W. Hartmann, 1821 accepted as Ciliella ciliata (W. Hartmann, 1821)
- Species Helix ciliosa L. Pfeiffer, 1859
- Species Helix cimex Reeve, 1854
- Species Helix cincinniformis G. B. Sowerby I, 1841 accepted as Hypselostyla cincinniformis (G. B. Sowerby I, 1841)
- Species Helix cincinnus G. B. Sowerby I, 1841 accepted as Hypselostyla cincinna (G. B. Sowerby I, 1841)
- Species Helix cincta O. F. Müller, 1774
- Species Helix cincta I. Lea, 1834 accepted as Eurycampta arctistria (L. Pfeiffer, 1865)
- Species Helix cinctella Draparnaud, 1801 accepted as Hygromia cinctella (Draparnaud, 1801)
- Species Helix cinctites de Serres, 1844 †
- Species Helix cineracea Hombron & Jacquinot, 1841 accepted as Dendrotrochus cineraceus (Hombron & Jacquinot, 1841)
- Species Helix cinerascens L. Pfeiffer, 1845 accepted as Helicobulinus cinerascens (L. Pfeiffer, 1845)
- Species Helix cingalensis W. H. Benson, 1860 accepted as Euplecta semidecussata (Reeve, 1852)
- Species Helix cingulata S. Studer, 1820 accepted as Chilostoma cingulatum (S. Studer, 1820)
- Species Helix cingulella Rossmässler, 1837 accepted as Faustina cingulella (Rossmässler, 1837)
- Species Helix cingulina Strobel, 1844 accepted as Chilostoma colubrinum preslii (Rossmässler, 1836)
- Species Helix cinnamomeolineata S. Moricand, 1841 accepted as Leiostracus cinnamomeolineatus (S. Moricand, 1841)
- Species Helix circassica Mousson, 1863 accepted as Circassina frutis circassica (Mousson, 1863)
- Species Helix circe Reeve, 1853 accepted as Calocochlea zonifera circe (Reeve, 1853)
- Species Helix circinnata S. Studer, 1820
- Species Helix circulus L. Pfeiffer, 1846 accepted as Bradybaena circulus (L. Pfeiffer, 1846)
- Species Helix circumcarinata Stearns, 1879 accepted as Monadenia circumcarinata (Stearns, 1879)
- Species Helix circumcincta J. C. Cox, 1868 accepted as Nitor circumcinctus (J. C. Cox, 1868)
- Species Helix circumdata A. Férussac, 1821 accepted as Chloritis circumdata (A. Férussac, 1821)
- Species Helix circumdata Anton, 1838 accepted as Trochomorpha typus H. B. Baker, 1941
- Species Helix circumfilaris Morelet, 1879 accepted as Sitala circumfilaris (Morelet, 1879)
- Species Helix circumfirmata Redfield, 1853 accepted as Poecilozonites circumfirmatus (Redfield, 1853)
- Species Helix circumlineata L. Pfeiffer, 1846 accepted as Gyralina circumlineata (L. Pfeiffer, 1846)
- Species Helix circumornata A. Férussac, 1821 accepted as Coryda circumornata (A. Férussac, 1821)
- Species Helix circumplexa Deshayes, 1839 accepted as Systrophiella circumplexa (Deshayes, 1839)
- Species Helix circumsessa Shuttleworth, 1852 accepted as Retinella circumsessa (Shuttleworth, 1852)
- Species Helix cirsiiphila Mabille, 1883
- Species Helix cirtae Terver, 1839 accepted as Eobania constantina (E. Forbes, 1838)
- Species Helix cirumornata [sic] accepted as Coryda circumornata (A. Férussac, 1821)
- Species Helix cisalpina Rossmässler, 1837 accepted as Cernuella cisalpina (Rossmässler, 1837)
- Species Helix cisternasi Hidalgo, 1883 accepted as Xerocrassa cisternasi (Hidalgo, 1883)
- Species Helix cistorum Morelet, 1845 accepted as Helicella cistorum (Morelet, 1845)
- Species Helix citrina Linnaeus, 1758 accepted as Xesta citrina (Linnaeus, 1758)
- Species Helix citrinula L. Pfeiffer, 1859 accepted as Faustina faustina (Rossmässler, 1835)
- Species Helix clara Held, 1838 accepted as Oxychilus clarus (Held, 1838)
- Species Helix clarencensis J. C. Cox, 1865 accepted as Helix subrugata Reeve, 1852
- Species Helix clarkii I. Lea, 1858 accepted as Patera clarkii clarkii (I. Lea, 1858)
- Species Helix claromphalos Deville & Hupé, 1850 accepted as Epiphragmophora claromphalos (Deville & Hupé, 1850)
- Species Helix clathratula L. Pfeiffer, 1850 accepted as Ruthvenia clathratula (L. Pfeiffer, 1850)
- Species Helix clausa A. Férussac, 1821 accepted as Inflectarius inflectus (Say, 1821)
- Species Helix clausomphalos Deville & Hupé, 1850 accepted as Epiphragmophora clausomphalos (Deville & Hupé, 1850)
- Species Helix claustralis Menke, 1828 accepted as Monacha claustralis (Menke, 1828)
- Species Helix clausus Say, 1821 accepted as Mesodon clausus (Say, 1821)
- Species Helix clavulus Quoy & Gaimard, 1832 accepted as Helix goodallii J. S. Miller, 1822
- Species Helix clayi Liardet, 1876 accepted as Liardetia striolata (Pease, 1861)
- Species Helix clessini Uličný, 1885 accepted as Plicuteria lubomirskii (Ślósarski, 1881)
- Species Helix climacterica W. H. Benson, 1836 accepted as Khasiella climacterica (W. H. Benson, 1836)
- Species Helix clopica Mabille, 1888 represented as Camaena gabriellae gabriellae (Dautzenberg & d'Hammonville, 1887)
- Species Helix clotho Deshayes, 1850 accepted as Ampelita clotho (Deshayes, 1850)
- Species Helix coactiliata Deshayes, 1839 accepted as Averellia coactiliata (Deshayes, 1839)
- Species Helix coadunata Rossmässler, 1838 accepted as Petasina leucozona (C. Pfeiffer, 1828)
- Species Helix coagulata L. Pfeiffer, 1856
- Species Helix coagulum E. von Martens, 1889 accepted as Dorcasia coagulum (E. von Martens, 1889)
- Species Helix coarctata Klein, 1853 † accepted as Apula coarctata (Klein, 1853) †
- Species Helix coarctata L. Pfeiffer, 1849 accepted as Libera streptaxon (Reeve, 1852)
- Species Helix coarctata Deshayes, 1850 accepted as Sphaerospira fraseri (J. E. Gray, 1833)
- Species Helix coccinea Gmelin, 1791 accepted as Littoraria coccinea (Gmelin, 1791)
- Species Helix coccomelos G. B. Sowerby I, 1841 accepted as Calocochlea coccomelos (G. B. Sowerby I, 1841)
- Species Helix cochinchinensis L. Pfeiffer, 1862 accepted as Bradybaena cochinchinensis (L. Pfeiffer, 1862)
- Species Helix cochlidium J. C. Cox, 1868 accepted as Egilomen cochlidium (J. C. Cox, 1868)
- Species Helix cocquii Brongniart, 1810 † accepted as Parachloraea cocquii (Brongniart, 1810) †
- Species Helix codia Bourguignat, 1860 accepted as Candidula codia (Bourguignat, 1860)
- Species Helix codonodes L. Pfeiffer, 1847 accepted as Oreobba codonodes (L. Pfeiffer, 1847)
- Species Helix codopsis Servain, 1880 accepted as Candidula codia (Bourguignat, 1860)
- Species Helix codringtonii J. E. Gray, 1834 accepted as Codringtonia codringtonii (J. E. Gray, 1834)
- Species Helix coelata Vallot, 1801 accepted as Helicopsis striata (O. F. Müller, 1774)
- Species Helix coelomphala Locard, 1888 accepted as Trochulus coelomphala (Locard, 1888)
- Species Helix coementitia Shuttleworth, 1852 accepted as Monilearia caementitia (Shuttleworth, 1852)
- Species Helix coespitum A. Villa & G. B. Villa, 1841 accepted as Xerosecta cespitum (Draparnaud, 1801)
- Species Helix coffea L. Pfeiffer, 1855 accepted as Asperitas coffea (L. Pfeiffer, 1855)
- Species Helix coffreana S. Moricand, 1841 accepted as Happia coffreana (S. Moricand, 1841)
- Species Helix cognata A. Férussac, 1821 accepted as Thelidomus cognata (A. Férussac, 1821)
- Species Helix coguiensis Crosse, 1872 accepted as Ptychorhytida testudinaria (Gassies, 1859)
- Species Helix coiguecana R. A. Philippi, 1855
- Species Helix coimbricensis Castro, 1887
- Species Helix collaris L. Pfeiffer, 1867 accepted as Sculptaria collaris (L. Pfeiffer, 1867)
- Species Helix collaris A. Férussac, 1821 accepted as Brachypodella collaris (A. Férussac, 1832)
- Species Helix collingii E. A. Smith, 1893 accepted as Setobaudinia collingii (E. A. Smith, 1893)
- Species Helix collis Mousson, 1881 accepted as Planispira zonaria (Linnaeus, 1767)
- Species Helix collisi Brazier, 1877 accepted as Laomavix collisi (Brazier, 1877)
- Species Helix collodes G. B. Sowerby I, 1841 accepted as Helicostyla collodes (G. B. Sowerby I, 1841)
- Species Helix collongeoni Michaud, 1855 † accepted as Macrozonites collongeoni (Michaud, 1855) †
- Species Helix collyrula Reeve, 1852 accepted as Neophenacohelix giveni (Cumber, 1961)
- Species Helix colona E. von Martens, 1878 accepted as Rhagada colona (E. von Martens, 1878)
- Species Helix colorata A. Braun, 1851 † accepted as Palaeotachea subsulcosa (Thomä, 1845) †
- Species Helix colorata Mousson, 1849 accepted as Asperitas colorata (Mousson, 1849)
- Species Helix colossea L. Pfeiffer, 1852 accepted as Helicobulinus grandis (L. Pfeiffer, 1845)
- Species Helix colosseana Fagot, 1884 accepted as Cernuella cisalpina (Rossmässler, 1837)
- Species Helix colubrina Perry, 1811 accepted as Solaropsis undata ([Lightfoot], 1786)
- Species Helix colubrina De Cristofori & Jan, 1832 accepted as Chilostoma cingulatum colubrinum (De Cristofori & Jan, 1832)
- Species Helix columbaria G. B. Sowerby I, 1841 accepted as Obba columbaria (G. B. Sowerby I, 1841)
- Species Helix columbiana I. Lea, 1838 accepted as Vespericola columbiana (I. Lea, 1838)
- Species Helix columellaris L. Pfeiffer, 1849 accepted as Thapsia columellaris (L. Pfeiffer, 1849)
- Species Helix columellata C. B. Adams, 1850 accepted as Zaphysema columellatum (C. B. Adams, 1850)
- Species Helix columnae Kobelt, 1889 accepted as Helix (Gonostoma) columnae Kobelt, 1889
- Species Helix comaliana Bourguignat, 1882 accepted as Eremina desertella (Jickeli, 1872)
- Species Helix comatula F. Sandberger, 1871 † accepted as Pseudoleptaxis comatula (F. Sandberger, 1871) †
- Species Helix combesiana Bourguignat, 1883 accepted as Urguessella pilifera (E. von Martens, 1869)
- Species Helix comboides A. d'Orbigny, 1835 accepted as Streptartemon comboides (A. d'Orbigny, 1835)
- Species Helix combusta Ancey, 1884
- Species Helix comendadori Servain, 1880 accepted as Xerosecta reboudiana (Bourguignat, 1863)
- Species Helix comephora Bourguignat, 1858 accepted as Josephinella comephora (Bourguignat, 1858)
- Species Helix comes Poey, 1858 accepted as Cysticopsis comes (Poey, 1858)
- Species Helix communis Benoit, 1857
- Species Helix commutanda Ancey, 1888 accepted as Cryptomastix harfordiana (W. G. Binney, 1886)
- Species Helix comnena Retowski, 1889 accepted as Cernuella cisalpina (Rossmässler, 1837)
- Species Helix comorensis Morelet, 1881 accepted as Xesta comorensis (Morelet, 1881)
- Species Helix complanata Linnaeus, 1758 accepted as Hippeutis complanatus (Linnaeus, 1758)
- Species Helix compluviata J. C. Cox, 1872 accepted as Orpiella compluviata (J. C. Cox, 1872)
- Species Helix compressa Rossmässler, 1836 accepted as Aegopis compressus (Rossmässler, 1836)
- Species Helix compressivoluta Reeve, 1852 accepted as Flammoconcha compressivoluta (Reeve, 1852)
- Species Helix compsopleura Bourguignat, 1883 accepted as Chilostoma colubrinum colubrinum (De Cristofori & Jan, 1832)
- Species Helix comriei H. Adams & Angas, 1876 accepted as Letitia brumeriensis comriei (H. Adams & Angas, 1876)
- Species Helix comta L. Pfeiffer, 1857 accepted as Hemitrochus comtus (L. Pfeiffer, 1857)
- Species Helix concamerata W. Wood, 1828 accepted as Gonidomus concamerata (W. Wood, 1828)
- Species Helix concava Say, 1821 accepted as Haplotrema concavum (Say, 1821)
- Species Helix concavospira Reeve, 1854 accepted as Euplecta concavospira (Reeve, 1854)
- Species Helix concentrica Le Guillou, 1842 accepted as Diastole tongana (Quoy & Gaimard, 1832)
- Species Helix concinna Jeffreys, 1830 accepted as Trochulus hispidus (Linnaeus, 1758)
- Species Helix concinna G. B. Sowerby I, 1841 accepted as Hypselostyla concinna (G. B. Sowerby I, 1841)
- Species Helix concinna R. T. Lowe, 1861
- Species Helix concisa A. Férussac, 1823 accepted as Chloritis concisa (A. Férussac, 1823)
- Species Helix concolor Lamarck, 1819 accepted as Zophos concolor (Lamarck, 1819)
- Species Helix condoriana Crosse & P. Fischer, 1863 accepted as Bellatrachia condoriana (Crosse & P. Fischer, 1863)
- Species Helix conella L. Pfeiffer, 1861 accepted as Laoma mariae (J. E. Gray, 1843)
- Species Helix conemenosi O. Boettger, 1885 accepted as Josephinella conemenosi (O. Boettger, 1885)
- Species Helix conferta L. Pfeiffer, 1857 accepted as Rhyssotopsis conferta (L. Pfeiffer, 1857)
- Species Helix confinis Gassies, 1875 accepted as Andrefrancia confinis (Gassies, 1875)
- Species Helix conformis A. Férussac, 1821 accepted as Crystallopsis conformis (A. Férussac, 1821)
- Species Helix confucii Hilber, 1883 accepted as Cathaica orithyia confucii (Hilber, 1883)
- Species Helix confusa L. Pfeiffer, 1855 accepted as Strangesta confusa (L. Pfeiffer, 1855)
- Species Helix confusa Benoit, 1857 accepted as Campylaea planospira (Lamarck, 1822)
- Species Helix congrua Pease, 1868 accepted as Trochomorpha contigua Pease, 1871
- Species Helix congrua L. Pfeiffer, 1858
- Species Helix conicoides Metcalfe, 1852 accepted as Geotrochus conicoides (Metcalfe, 1852)
- Species Helix connectens C. B. Adams, 1850 accepted as Sagda connectens (C. B. Adams, 1850)
- Species Helix connivens L. Pfeiffer, 1850 accepted as Bradybaena circulus circulus (L. Pfeiffer, 1846)
- Species Helix conoidalis A. Adams & Reeve, 1850
- Species Helix conoidea Draparnaud, 1801 accepted as Cochlicella conoidea (Draparnaud, 1801)
- Species Helix conoidea J. C. Cox, 1864 accepted as Hedleyoconcha delta (L. Pfeiffer, 1857)
- Species Helix conomphala L. Pfeiffer, 1853
- Species Helix conopsis Morelet, 1876 accepted as Xeroleuca conopsis (Morelet, 1876)
- Species Helix conospira L. Pfeiffer, 1851 accepted as Trishoplita conospira (L. Pfeiffer, 1851)
- Species Helix conradti E. von Martens, 1895 accepted as Halolimnohelix conradti (E. von Martens, 1895)
- Species Helix conrauxiana Heude, 1885
- Species Helix consanguinea Deshayes, 1850 accepted as Ampelita consanguinea (Deshayes, 1850)
- Species Helix consanguinea C. B. Adams, 1851 accepted as Dentellaria candescens (C. B. Adams, 1850)
- Species Helix conscendens J. C. Cox, 1866 accepted as Posorites conscendens (J. C. Cox, 1866)
- Species Helix consepta W. H. Benson, 1860 accepted as Sarika consepta (W. H. Benson, 1860)
- Species Helix consimilis Pease, 1868 accepted as Mautodontha (Garrettoconcha) consimilis (Pease, 1868)
- Species Helix consobrina A. Férussac, 1822 accepted as Hemicycla consobrina (A. Férussac, 1822)
- Species Helix consona Rossmässler, 1839 accepted as Monacha consona (Rossmässler, 1839)
- Species Helix conspectum Bland, 1865 accepted as Paralaoma servilis (Shuttleworth, 1852)
- Species Helix conspersula L. Pfeiffer, 1846 accepted as Dialeuca conspersula (L. Pfeiffer, 1846)
- Species Helix conspurcata Draparnaud, 1801 accepted as Xerotricha conspurcata (Draparnaud, 1801)
- Species Helix conspurcatella Morelet, 1851 accepted as Thysanophora conspurcatella (Morelet, 1851)
- Species Helix constantina E. Forbes, 1838 accepted as Massylaea constantina (E. Forbes, 1838)
- Species Helix constantinae Bourguignat, 1863 accepted as Eobania constantina (E. Forbes, 1838)
- Species Helix constatior Weinland, 1880 accepted as Hemitrochus constatior (Weinland, 1880)
- Species Helix constricta L. Pfeiffer, 1845 accepted as Chloraea restricta (L. Pfeiffer, 1854)
- Species Helix constricta Boubée, 1836 accepted as Trissexodon constrictus (Boubée, 1836)
- Species Helix constrictelabiata K. Miller, 1907 † accepted as Loganiopharynx constrictelabiatus (K. Miller, 1907) †
- Species Helix constrictor Hupé, 1853 accepted as Solaropsis constrictor (Hupé, 1853)
- Species Helix consul Reeve, 1854
- Species Helix contermina L. Pfeiffer, 1847 accepted as Xerosecta contermina (L. Pfeiffer, 1848)
- Species Helix continua Reeve, 1854 accepted as Isomeria continua (Reeve, 1854)
- Species Helix contorta Linnaeus, 1758 accepted as Bathyomphalus contortus (Linnaeus, 1758)
- Species Helix contorta A. Férussac, 1825 accepted as Cookeconcha contorta (A. Férussac, 1825)
- Species Helix contorta Rossmässler, 1838 accepted as Lindholmiola corcyrensis (Rossmässler, 1838)
- Species Helix contorta Krynicki, 1836 accepted as Vitrea contortula (Krynicki, 1837)
- Species Helix contorta Held, 1837 accepted as Vitrea diaphana (S. Studer, 1820)
- Species Helix contortaplicata Gmelin, 1791
- Species Helix contracta W. H. Benson, 1864 accepted as Trachia contracta (W. H. Benson, 1864)
- Species Helix contractiva Mabille, 1889 accepted as Aegistohadra contractiva (Mabille, 1889)
- Species Helix contraria O. F. Müller, 1774 accepted as Amphidromus contrarius (O. F. Müller, 1774)
- Species Helix contrarius O. F. Müller, 1774 accepted as Amphidromus contrarius (O. F. Müller, 1774)
- Species Helix contusulus A. Férussac, 1827 accepted as Hypselartemon contusulus (A. Férussac, 1827)
- Species Helix conula Pease, 1861 accepted as Diastole conula (Pease, 1861)
- Species Helix conulifera Locard, 1894 † accepted as Trochulus plebeius (Draparnaud, 1805)
- Species Helix conulina E. von Martens, 1867 accepted as Trishoplita conulina (E. von Martens, 1867)
- Species Helix conulus E. von Martens, 1864
- Species Helix conus L. Pfeiffer, 1841 accepted as Geotrochus conus (L. Pfeiffer, 1841)
- Species Helix conus R. A. Philippi, 1842 accepted as Geotrochus conus (L. Pfeiffer, 1841)
- Species Helix convallata W. H. Benson, 1856 accepted as Taphrospira convallata (W. H. Benson, 1856)
- Species Helix convexa Deshayes, 1830 accepted as Euchemotrema fraternum fraternum (Say, 1824)
- Species Helix convexa Reeve, 1852 accepted as Bensonies convexa (Reeve, 1852)
- Species Helix convexiuscula L. Pfeiffer, 1855 accepted as Euplecta layardi (Reeve, 1852)
- Species Helix convicta J. C. Cox, 1870 accepted as Rhagada convicta (J. C. Cox, 1870)
- Species Helix cookensis Brazier, 1875 accepted as Steorra cookensis (Brazier, 1875)
- Species Helix cookiana Gmelin, 1791 accepted as Sagda cookiana (Gmelin, 1791)
- Species Helix cooperi W. G. Binney, 1858 accepted as Oreohelix strigosa cooperi (W. G. Binney, 1858)
- Species Helix copei Wetherby, 1878 accepted as Triodopsis vultuosa (A. Gould, 1848)
- Species Helix coquandi Morelet, 1854 accepted as Pseudotachea liturata (L. Pfeiffer, 1853)
- Species Helix coquandiana Matheron, 1843 † accepted as Parachloraea lapicidites (Boubée, 1831) †
- Species Helix cora A. d'Orbigny, 1835 accepted as Neopetraeus cora (A. d'Orbigny, 1835)
- Species Helix coracis Kobelt, 1893
- Species Helix coraliolabris E. A. Smith, 1887 accepted as Letitia chapmani (J. C. Cox, 1879)
- Species Helix corallina Chemnitz, 1795 accepted as Scalenostoma subulatum (Broderip, 1832)
- Species Helix corax L. Pfeiffer, 1857 accepted as Turcozonites corax (L. Pfeiffer, 1857)
- Species Helix corcyrensis Rossmässler, 1838 accepted as Lindholmiola corcyrensis (Rossmässler, 1838)
- Species Helix cordovana L. Pfeiffer, 1857 accepted as Trichodiscina cordovana (L. Pfeiffer, 1857)
- Species Helix corduensis Noulet, 1854 † accepted as Pseudoleptaxis corduensis (Noulet, 1854) †
- Species Helix coreanica A. Adams & Reeve, 1850
- Species Helix coriacea Pallas, 1788 accepted as Velutina coriacea (Pallas, 1788)
- Species Helix coriacea F. Sandberger, 1870 † accepted as Dentellocaracolus damnatus (Brongniart, 1823) †
- Species Helix coriaria L. Pfeiffer, 1847 accepted as Sauroconcha gulosa (A. Gould, 1846)
- Species Helix corisopitensis Deshayes, 1832 accepted as Elona quimperiana (Blainville, 1821)
- Species Helix cornea Linnaeus, 1758 accepted as Planorbarius corneus (Linnaeus, 1758)
- Species Helix cornea Draparnaud, 1801
- Species Helix corneafulva L. Pfeiffer, 1861 accepted as Oxychilus cellarius (O. F. Müller, 1774)
- Species Helix corneola Clessin, 1874
- Species Helix corneovirens L. Pfeiffer, 1851 accepted as Sauroconcha corneovirens (L. Pfeiffer, 1851)
- Species Helix corniculum Reeve, 1852 accepted as Mocella eta (L. Pfeiffer, 1853)
- Species Helix corniculum Hombron & Jacquinot, 1847 accepted as Cristigibba corniculum (Hombron & Jacquinot, 1847)
- Species Helix cornuarietis Linnaeus, 1758 accepted as Marisa cornuarietis (Linnaeus, 1758)
- Species Helix cornugigantea A. Férussac, 1821 accepted as Helicophanta vesicalis (Lamarck, 1822)
- Species Helix cornumilitare Linnaeus, 1758 accepted as Pyrochilus cornumilitare (Linnaeus, 1758)
- Species Helix cornuvenatorium Gmelin, 1791 accepted as Crossopoma cornuvenatorium (Gmelin, 1791)
- Species Helix coronadoi Hidalgo, 1868 accepted as Calocochlea coronadoi (Hidalgo, 1868)
- Species Helix coronata Deshayes, 1850 accepted as Serratorotula juliformis (R. T. Lowe, 1852)
- Species Helix coronata Studer, 1789 accepted as Sphyradium doliolum (Bruguière, 1792)
- Species Helix coronula R. T. Lowe, 1852 † accepted as Craspedaria coronula (R. T. Lowe, 1852) †
- Species Helix corrugata L. Pfeiffer, 1847 accepted as Leptaxis groviana (A. Férussac, 1832)
- Species Helix corrupta Bogachev, 1936 †
- Species Helix corsica Shuttleworth, 1843 accepted as Cyrnotheba corsica (Shuttleworth, 1843)
- Species Helix corticaria R. A. Philippi, 1855 accepted as Radiodiscus corticaria (R. A. Philippi, 1855)
- Species Helix corticicola J. C. Cox, 1866 accepted as Ngairea corticicola (J. C. Cox, 1866)
- Species Helix corusca Morelet, 1877 accepted as Tanychlamys corusca (Morelet, 1877)
- Species Helix corvus Gmelin, 1791 accepted as Stagnicola corvus (Gmelin, 1791)
- Species Helix corymbus Crosse, 1874 accepted as Rhytidopsis corymbus (Crosse, 1874)
- Species Helix corys W. H. Benson, 1859 accepted as Rahula corys (W. H. Benson, 1859)
- Species Helix cosmia L. Pfeiffer, 1852 accepted as Lyrocystis cosmia (L. Pfeiffer, 1852)
- Species Helix cossmanni Bédé, 1904 †
- Species Helix costae Benoit, 1857 accepted as Cornu mazzullii (De Cristofori & Jan, 1832)
- Species Helix costaricensis L. Pfeiffer, 1856 accepted as Leptarionta costaricensis (L. Pfeiffer, 1856)
- Species Helix costata O. F. Müller, 1774 accepted as Vallonia costata (O. F. Müller, 1774)
- Species Helix costellata A. d'Orbigny, 1835 accepted as Zilchogyra costellata (A. d'Orbigny, 1835)
- Species Helix costulata J. C. Cox, 1864 accepted as Helix saturni J. C. Cox, 1864
- Species Helix costulata A. Férussac, 1821 accepted as Bulimus inflatus Lamarck, 1822
- Species Helix costulata Brancsik, 1897 accepted as Semifruticicola serbica A. J. Wagner, 1914
- Species Helix costulatostriata Greppin, 1855 † accepted as Discus costulatostriatus (Greppin, 1855) †
- Species Helix costulifera Reeve, 1854 accepted as Andrefrancia costulifera (Reeve, 1854)
- Species Helix costulosa L. Pfeiffer, 1853 accepted as Rectartemon costulosus (L. Pfeiffer, 1853)
- Species Helix cotiellae Fagot, 1906 accepted as Pyrenaearia cotiellae (Fagot, 1906)
- Species Helix cotteri Roman, 1907 † accepted as Megalotachea cotteri (Roman, 1907) †
- Species Helix cottyi Morelet, 1864 accepted as Xeropicta cottyi (Morelet, 1864)
- Species Helix cotyledonis W. H. Benson, 1850 accepted as Sheldonia cotyledonis (W. H. Benson, 1850)
- Species Helix couloni Shuttleworth, 1852 accepted as Polygyra couloni (Shuttleworth, 1852)
- Species Helix coxenae Brazier, 1875 accepted as Spurlingia dunkiensis (Forbes, 1852)
- Species Helix coxeni J. C. Cox, 1871 accepted as Gloreugenia coxeni (J. C. Cox, 1871)
- Species Helix coxi Crosse, 1866 accepted as Bentosites coxi (Crosse, 1866)
- Species Helix cramauxensis Noulet, 1868 † accepted as Parachloraea adornata (Noulet, 1868) †
- Species Helix crassa L. Pfeiffer, 1850 accepted as Codringtonia neocrassa Zilch, 1952
- Species Helix crassicostata W. H. Benson, 1848 accepted as Trachia crassicostata (W. H. Benson, 1848)
- Species Helix crassidens Reeve, 1854
- Species Helix crassilabris L. Pfeiffer, 1847 accepted as Edentiella leucozona leucozona (C. Pfeiffer, 1828)
- Species Helix crassilabris L. Pfeiffer, 1859
- Species Helix crassula R. A. Philippi, 1844 accepted as Chloritis crassula (R. A. Philippi, 1844)
- Species Helix crebriflammea Reeve, 1852 accepted as Flammulina crebriflammea (Reeve, 1852)
- Species Helix crebriflammis L. Pfeiffer, 1853 accepted as Flammulina crebriflammea (Reeve, 1852)
- Species Helix crebristriata Newcomb, 1864 accepted as Xerarionta intercisa (W. G. Binney, 1857)
- Species Helix creedi J. C. Cox, 1868 accepted as Arnemelassa creedi (J. C. Cox, 1868)
- Species Helix cremata Heude, 1882 accepted as Bradybaena cremata (Heude, 1882)
- Species Helix cremnophila Charpentier, 1847 accepted as Xerocrassa eremophila (L. Pfeiffer, 1853)
- Species Helix crenata Gmelin, 1791 accepted as Amphibola crenata (Gmelin, 1791)
- Species Helix crenella Montagu, 1803 accepted as Vallonia costata (O. F. Müller, 1774)
- Species Helix crenimargo L. Pfeiffer, 1848 accepted as Kalitinaia crenimargo (L. Pfeiffer, 1848)
- Species Helix crenophila L. Pfeiffer, 1857 accepted as Monacha crenophila (L. Pfeiffer, 1857)
- Species Helix crenulata Olivier, 1804 accepted as Helix ptychodia Bourguignat, 1864
- Species Helix crepidostoma F. Sandberger, 1872 † accepted as Palaeotachea subsulcosa (Thomä, 1845) †
- Species Helix cressida A. Gould, 1846 accepted as Trochomorpha cressida (A. Gould, 1846)
- Species Helix cretacea Tausch, 1886 † accepted as Schwardtina cretacea (Tausch, 1886) †
- Species Helix cretata Broderip, 1841 accepted as Trachystyla cryptica cretata (Broderip, 1841)
- Species Helix cretica L. Pfeiffer, 1841 accepted as Helix (Helicella) cretica L. Pfeiffer, 1841
- Species Helix creveauxiana Ancey, 1890 accepted as Labyrinthus creveauxianus (Ancey, 1890)
- Species Helix crinigera W. H. Benson, 1850 accepted as Thysanota crinigera (W. H. Benson, 1850)
- Species Helix crinita Strobel, 1854 accepted as Liburnica crinita (Strobel, 1854)
- Species Helix crispata A. Férussac, 1821 accepted as Polydontes crispatus (A. Férussac, 1821)
- Species Helix crispolanata Wollaston, 1878 accepted as Xerotricha crispolanata (Wollaston, 1878)
- Species Helix crispulata Mousson, 1861 accepted as Monacha crispulata (Mousson, 1861)
- Species Helix croatica A. Férussac, 1832 accepted as Aegopis croaticus (A. Férussac, 1832)
- Species Helix crocea Gmelin, 1791 accepted as Neopupina crocea (Gmelin, 1791)
- Species Helix croftoni J. C. Cox, 1872 accepted as Bentosites coxi (Crosse, 1866)
- Species Helix crombezi Locard, 1882 accepted as Corneola crombezi (Locard, 1882)
- Species Helix cromyodes L. Pfeiffer, 1843 accepted as Calocochlea cromyodes (L. Pfeiffer, 1843)
- Species Helix cronkhitei Newcomb, 1865 accepted as Discus whitneyi (Newcomb, 1864)
- Species Helix crossei L. Pfeiffer, 1862 accepted as Phuphania crossei (L. Pfeiffer, 1862)
- Species Helix crotali J. C. Cox, 1864 accepted as Expocystis rusticus (L. Pfeiffer, 1852)
- Species Helix crouanii Le Guillou, 1842
- Species Helix crucibulum L. Pfeiffer, 1857
- Species Helix crusta Dall, 1890 † accepted as Cepolis (Plagioptycha) crusta (Dall, 1890) †
- Species Helix crustulum J. C. Cox, 1873 accepted as Trochomorpha crustulum (J. C. Cox, 1873)
- Species Helix cruzyi Bourguignat, 1855
- Species Helix crypsidoma Mabille, 1882 accepted as Hemicycla saulcyi (A. d'Orbigny, 1839)
- Species Helix crypta L. Pfeiffer, 1868 accepted as Aegopis acies (A. Férussac, 1819)
- Species Helix cryptica Broderip, 1841 accepted as Trachystyla cryptica (Broderip, 1841)
- Species Helix cryptoportica A. Gould, 1846 accepted as Philonesia cryptoportica (A. Gould, 1846)
- Species Helix crystallina O. F. Müller, 1774 accepted as Vitrea crystallina (O. F. Müller, 1774)
- Species Helix cubensis L. Pfeiffer, 1840 accepted as Cysticopsis cubensis (L. Pfeiffer, 1840)
- Species Helix cucullus E. von Martens, 1875 accepted as Trochoidea cucullus (E. von Martens, 1875)
- Species Helix culmi Fagot, 1888 accepted as Xerotricha barcinensis (Bourguignat, 1868)
- Species Helix culminea A. d'Orbigny, 1835 accepted as Bocourtia culminea (A. d'Orbigny, 1835)
- Species Helix cultrata A. Gould, 1846 accepted as Hiona cultrata (A. Gould, 1846)
- Species Helix cumiae Calcara, 1847 accepted as Trochoidea cumiae (Calcara, 1847)
- Species Helix cumingii L. Pfeiffer, 1842 accepted as Anixa cumingii (L. Pfeiffer, 1842)
- Species Helix cumulus Reeve, 1854
- Species Helix cunninghami J. E. Gray, 1834 accepted as Pedinogyra hayii (J. E. Gray, 1833)
- Species Helix cupaniana Calcara, 1842 accepted as Xerotricha conspurcata (Draparnaud, 1801)
- Species Helix cupanii Calcara, 1842 accepted as Xerotricha conspurcata (Draparnaud, 1801)
- Species Helix cuprea J. C. Cox, 1868 accepted as Luinodiscus cupreus (J. C. Cox, 1868)
- Species Helix cureti Nicolas, 1891 †
- Species Helix curta G. B. Sowerby I, 1841 accepted as Helicostyla curta (G. B. Sowerby I, 1841)
- Species Helix curtisiana L. Pfeiffer, 1864 accepted as Figuladra lessoni (L. Pfeiffer, 1846)
- Species Helix curvidens Reeve, 1854
- Species Helix curvilabrum A. Adams & Reeve, 1850 accepted as Chloraea curvilabra (A. Adams & Reeve, 1850)
- Species Helix cuticula Shuttleworth, 1852 accepted as Guerrina cuticula (Shuttleworth, 1852)
- Species Helix cutteri L. Pfeiffer, 1856
- Species Helix cuvieriana I. Lea, 1840 accepted as Hemiglypta cuvieriana (I. Lea, 1840)
- Species Helix cuyana L. Pfeiffer, 1867 accepted as Bostryx cuyanus (L. Pfeiffer, 1867)
- Species Helix cuzcana R. A. Philippi, 1869 accepted as Happia cuzcana (R. A. Philippi, 1869)
- Species Helix cyanostoma Mabille, 1884 accepted as Ampelita calypso (L. Pfeiffer, 1862)
- Species Helix cyathellus L. Pfeiffer, 1846 accepted as Vitrinoconus cyathellus (L. Pfeiffer, 1846)
- Species Helix cyathus L. Pfeiffer, 1846 accepted as Vitrinoconus cyathus (L. Pfeiffer, 1846)
- Species Helix cyclaria Morelet, 1875 accepted as Propilula cyclaria (Morelet, 1875)
- Species Helix cyclaspis W. H. Benson, 1859 accepted as Plectopylis cyclaspis (W. H. Benson, 1859)
- Species Helix cyclodon A. d'Orbigny, 1836
- Species Helix cyclolabris Deshayes, 1840 accepted as Thiessea cyclolabris (Deshayes, 1840)
- Species Helix cycloplax W. H. Benson, 1852 accepted as Oxytesta cycloplax (W. H. Benson, 1852)
- Species Helix cyclostoma Menke, 1830 accepted as Disculella madeirensis madeirensis (W. Wood, 1828)
- Species Helix cyclostomata Le Guillou, 1842 accepted as Trachiopsis strangulata (Hombron & Jacquinot, 1841)
- Species Helix cyclostomoides L. Pfeiffer, 1840 accepted as Vitrinella cyclostomoides (L. Pfeiffer, 1840)
- Species Helix cyclostomoides Mousson, 1854 accepted as Cernuella aradasii (Pirajno, 1842)
- Species Helix cyclostomopsis I. Lea, 1834
- Species Helix cyclostrema W. H. Benson, 1863 accepted as Chloritis cyclostrema (W. H. Benson, 1863)
- Species Helix cyclotrema W. H. Benson, 1863
- Species Helix cygneus W. H. Benson, 1853 accepted as Luinodiscus cygneus (W. H. Benson, 1853)
- Species Helix cyix W. H. Benson, 1860 accepted as Ariophanta bistrialis (H. Beck, 1837)
- Species Helix cymatium L. Pfeiffer, 1856 accepted as Hemiplecta cymatium (L. Pfeiffer, 1856)
- Species Helix cymatodes L. Pfeiffer, 1852 accepted as Isomeria cymatodes (L. Pfeiffer, 1852)
- Species Helix cymatopleura Mabille, 1883 accepted as Leptaxis groviana (A. Férussac, 1832)
- Species Helix cymbalum Morelet, 1849 accepted as Mesomphix euryomphala (L. Pfeiffer, 1845)
- Species Helix cymodoce Crosse, 1869 accepted as Chloraea cymodoce (Crosse, 1869)
- Species Helix cyparissias L. Pfeiffer, 1847 accepted as Xeropicta krynickii (Krynicki, 1833)
- Species Helix cypreophila W. G. Binney & Bland, 1869 accepted as Helminthoglypta cypreophila cypreophila (W. G. Binney & Bland, 1869)
- Species Helix cypria L. Pfeiffer, 1847 accepted as Oxychilus cyprius (L. Pfeiffer, 1847)
- Species Helix cypsele L. Pfeiffer, 1849 accepted as Streptaxis cypsele (L. Pfeiffer, 1849)
- Species Helix cyrenaica E. von Martens, 1883
- Species Helix cyrene Crosse, 1869 accepted as Dendrotrochus cineraceus (Hombron & Jacquinot, 1841)
- Species Helix cyrniaca Dutailly, 1867 accepted as Tacheocampylaea cyrniaca (Dutailly, 1867)
- Species Helix cyrtolena Bourguignat, 1860 accepted as Helix borealis Mousson, 1859
- Species Helix cyrtopleura L. Pfeiffer, 1862 accepted as Pleuroxia cyrtopleura (L. Pfeiffer, 1862)
- Species Helix cysis W. H. Benson, 1852 accepted as Ariophanta cysis (W. H. Benson, 1852)
- Species Helix dacoronae A. Letourneux, 1884 accepted as Maltzanella godetiana (Kobelt, 1878)
- Species Helix daedalea A. Gould, 1846 accepted as Mautodontha daedalea (A. Gould, 1846)
- Species Helix daghestana Kobelt, 1877 accepted as Fruticocampylaea daghestana (Kobelt, 1877)
- Species Helix daghoba W. T. Blanford & H. F. Blanford, 1861 accepted as Philalanka daghoba (W. T. Blanford & H. F. Blanford, 1861)
- Species Helix dalbertisi Brazier, 1876 accepted as Paratrochus dalbertisi (Brazier, 1876)
- Species Helix dalmatina Dainelli, 1901 †
- Species Helix damahoyi L. Pfeiffer, 1857 accepted as Calocochlea damahoyi (L. Pfeiffer, 1857)
- Species Helix damascenus A. Gould, 1856 accepted as Helix pandorae Forbes, 1850
- Species Helix damnata Brongniart, 1823 † accepted as Dentellocaracolus damnatus (Brongniart, 1823) †
- Species Helix danae L. Pfeiffer, 1863 accepted as Phuphania crossei (L. Pfeiffer, 1862)
- Species Helix dandenongensis Petterd, 1879 accepted as Meredithena dandenongensis (Petterd, 1879)
- Species Helix dantei Bourguignat, 1882
- Species Helix danubialis Clessin, 1874 accepted as Trochulus striolatus danubialis (Clessin, 1874)
- Species Helix darchiacii de Boissy, 1840 † accepted as Parachloraea darchiacii (de Boissy, 1840) †
- Species Helix darnaudi L. Pfeiffer, 1857 accepted as Lejeania darnaudi (L. Pfeiffer, 1857)
- Species Helix darondeauii Souleyet, 1842 accepted as Hemiplecta darondeauii (Souleyet, 1842)
- Species Helix dasilepida Mabille, 1881 accepted as Caucasocressa dasilepida (Mabille, 1881)
- Species Helix dasypleura Bourguignat, 1881 † accepted as Gonyodiscus (Gonyodiscus) pleuradra (Bourguignat, 1881) †
- Species Helix davidi Deshayes, 1870 accepted as Armandiella davidi (Deshayes, 1870)
- Species Helix davidiana Bourguignat, 1864 accepted as Xerocrassa davidiana (Bourguignat, 1864)
- Species Helix dealbata Broderip, 1841 accepted as Chloraea broderipii (L. Pfeiffer, 1842)
- Species Helix dealbata Say, 1821 accepted as Rabdotus dealbatus (Say, 1821)
- Species Helix dealbatus Say, 1821 accepted as Rabdotus dealbatus dealbatus (Say, 1821)
- Species Helix deana Berthier, 1884 accepted as Xerocrassa geyeri (Soós, 1926)
- Species Helix debauxii Noulet, 1854 †
- Species Helix debeauxi Bourguignat, 1863 accepted as Plagyrona debeauxiana (Bourguignat, 1863)
- Species Helix debeauxiana Bourguignat, 1863 accepted as Plagyrona debeauxiana (Bourguignat, 1863)
- Species Helix decagyra R. A. Philippi, 1869 accepted as Happia decagyra (R. A. Philippi, 1869)
- Species Helix decidua L. Pfeiffer, 1857
- Species Helix decipiens G. B. Sowerby I, 1841 accepted as Calocochlea decipiens (G. B. Sowerby I, 1841)
- Species Helix declivis F. Sandberger, 1870 † accepted as Dentellocaracolus declivis (F. Sandberger, 1870) †
- Species Helix decollata Linnaeus, 1758 accepted as Rumina decollata (Linnaeus, 1758)
- Species Helix decora Mousson, 1854 accepted as Metafruticicola sublecta (Maltzan, 1884)
- Species Helix decora A. Adams & Reeve, 1850 accepted as Cochlodryas decora (A. Adams & Reeve, 1850)
- Species Helix decorata A. Férussac, 1821 accepted as Helicostyla decorata (A. Férussac, 1821)
- Species Helix decorata L. Pfeiffer, 1846
- Species Helix decreta Gassies, 1871 accepted as Andrefrancia decreta (Gassies, 1871)
- Species Helix dectica Mabille, 1888 accepted as Bradybaena dectica (Mabille, 1888)
- Species Helix decussata Montagu, 1803 accepted as Zebinella decussata (Montagu, 1803)
- Species Helix decussatula Pease, 1866 accepted as Cookeconcha decussatulus (Pease, 1866)
- Species Helix defectiva Locard, 1899 accepted as Candidula olisippensis (Servain, 1880)
- Species Helix deferiana Bourguignat, 1882 accepted as Xeroplexa intersecta (Poiret, 1801)
- Species Helix deflexa Souleyet, 1852 accepted as Haploptychius deflexus (Souleyet, 1852)
- Species Helix deflexa A. Braun, 1851 † accepted as Palaeotachea alloiodes (Thomä, 1845) †
- Species Helix deflexa L. Pfeiffer, 1845
- Species Helix defrancii Deshayes, 1863 † accepted as Cepaea moroguesi (Brongniart, 1810) †
- Species Helix defuncta Mabille, 1883 accepted as Idiomela subplicata (G. B. Sowerby I, 1824)
- Species Helix degenerans (Mousson, 1873) accepted as Leucochroa degenerans Mousson, 1874
- Species Helix dehiscens Westerlund, 1889 accepted as Helix pachya Bourguignat, 1860
- Species Helix dehnei Rossmässler, 1846 accepted as Theba subdentata dehnei (Rossmässler, 1846)
- Species Helix deidamia Angas, 1870 accepted as Papuina meta (L. Pfeiffer, 1856)
- Species Helix dejeana Heude, 1882 accepted as Laeocathaica dejeana (Heude, 1882)
- Species Helix dejecta Petit de la Saussaye, 1842 accepted as Helix dejecta S. Moricand, 1836
- Species Helix dejecta S. Moricand, 1836 accepted as Odontartemon dejectus (S. Moricand, 1836)
- Species Helix dejecta Rossmässler, 1838 accepted as Helix arenosa Krynicki, 1836
- Species Helix delabris Mousson, 1863 accepted as Caucasocressa joannis (Mortillet, 1854)
- Species Helix delacouri Mabille, 1880
- Species Helix delaminata C. B. Adams, 1851 accepted as Sagda delaminata (C. B. Adams, 1851)
- Species Helix delavayana Heude, 1885
- Species Helix delessertiana Le Guillou, 1842 accepted as Torresitrachia torresiana (Hombron & Jacquinot, 1841)
- Species Helix delibratus W. H. Benson, 1836 accepted as Bouchetcamaena delibrata (W. H. Benson, 1836)
- Species Helix deliciosa L. Pfeiffer, 1863 accepted as Burmochloritis deliciosa (L. Pfeiffer, 1863)
- Species Helix delphinensis Fontannes, 1876 † accepted as Megalotachea delphinensis (Fontannes, 1876) †
- Species Helix delphinula R. T. Lowe, 1831 † accepted as Craspedaria delphinula (R. T. Lowe, 1831) †
- Species Helix delphinuloides R. T. Lowe, 1860 accepted as Craspedaria delphinuloides (R. T. Lowe, 1860)
- Species Helix delta L. Pfeiffer, 1857 accepted as Hedleyoconcha delta (L. Pfeiffer, 1857)
- Species Helix demissus A. Binney, 1843 accepted as Ventridens demissus (A. Binney, 1843)
- Species Helix demolita Heude, 1885
- Species Helix denainvilliersi de Boissy, 1839 †
- Species Helix denatale L. Pfeiffer, 1856 accepted as Oxychilus denatale (L. Pfeiffer, 1856)
- Species Helix dendrobia Crosse, 1868 accepted as Coneuplecta calculosa (A. Gould, 1852)
- Species Helix dendrophila Mabille, 1883 accepted as Cernuella virgata (Da Costa, 1778)
- Species Helix dennisoni L. Pfeiffer, 1853 accepted as Coryda alauda dennisoni (L. Pfeiffer, 1853)
- Species Helix denotata A. Férussac, 1823 accepted as Xolotrema denotatum (A. Férussac, 1823)
- Species Helix densa A. Adams & Reeve, 1850 accepted as Hemiplecta densa (A. Adams & Reeve, 1850)
- Species Helix densipapillata F. Sandberger, 1862 † accepted as Galactochiloides densipapillata (F. Sandberger, 1862) †
- Species Helix denticulata J. C. Jay, 1839 accepted as Calocochlea denticulata (J. C. Jay, 1839)
- Species Helix dentiens A. Férussac, 1822 accepted as Pleurodonte dentiens (A. Férussac, 1822)
- Species Helix dentifera A. Binney, 1837 accepted as Neohelix dentifera (A. Binney, 1837)
- Species Helix dentiferus
- Species Helix dentrecasteauxi E. A. Smith, 1884 accepted as Chloritis dentrecasteauxi (E. A. Smith, 1884)
- Species Helix dentrita [sic] accepted as Helix detrita Montagu, 1803
- Species Helix dentula Quenstedt, 1867 † accepted as Palaeotachea dentula (Quenstedt, 1867) †
- Species Helix denudata Reuss, 1849 † accepted as Aegopinella denudata (Reuss, 1849) †
- Species Helix denudata Rossmässler, 1836 accepted as Liburnica denudata (Rossmässler, 1836)
- Species Helix depereti Locard, 1890 † accepted as Cornu aspersum (O. F. Müller, 1774)
- Species Helix depilata Draparnaud, 1801 accepted as Edentiella (Edentiella) edentula (Draparnaud, 1805)
- Species Helix deplanata Thomä, 1845 † accepted as Oxychilus deplanatus (Thomä, 1845) †
- Species Helix deplanata Westerlund, 1902
- Species Helix deplanchesi Gassies, 1870 accepted as Ptychorhytida aulacospira (L. Pfeiffer, 1846)
- Species Helix depressa Montagu, 1803 accepted as Skeneopsis planorbis (O. Fabricius, 1780)
- Species Helix depressa Eichwald, 1830 † accepted as Helicodiscus roemeri (Andreae, 1902) †
- Species Helix depressa Grateloup, 1828 † accepted as Aegopis subdepressus (A. d'Orbigny, 1852) †
- Species Helix depressa C. B. Adams, 1845 accepted as Aerotrochus perdepressa perdepressa (C. B. Adams, 1849)
- Species Helix depressa Bouillet, 1835 †
- Species Helix depressa Zieten, 1832 †
- Species Helix depressiformis Pease, 1865 accepted as Trochomorpha swainsoni (L. Pfeiffer, 1846)
- Species Helix depressissima Sacco, 1884 † accepted as Retinella depressissima (Sacco, 1884) †
- Species Helix depressus A. Adams, 1868 accepted as Discus depressus (A. Adams, 1868)
- Species Helix depsta J. C. Cox, 1870
- Species Helix derbentina Krynicki, 1836 accepted as Xeropicta derbentina (Krynicki, 1836)
- Species Helix derbesiana Crosse, 1875 accepted as Andrefrancia derbesiana (Crosse, 1875)
- Species Helix dermatina Shuttleworth, 1854 accepted as Levicepolis dermatina (Shuttleworth, 1854)
- Species Helix derogata Rossmässler, 1854 accepted as Xerocrassa derogata (Rossmässler, 1854)
- Species Helix desertella Jickeli, 1872 accepted as Eremina desertella (Jickeli, 1872)
- Species Helix desertorum Forsskål, 1775 accepted as Eremina desertorum (Forsskål, 1775)
- Species Helix desfontanea Morelet, 1851 accepted as Helix raymondii Saint-Simon, 1848
- Species Helix desgrazii Hombron & Jacquinot, 1847
- Species Helix deshayesii Anton, 1838
- Species Helix desidens Rang, 1834 accepted as Discolepis desidens (Rang, 1834)
- Species Helix desiderata L. Pfeiffer, 1858 accepted as Odontosagda desiderata (L. Pfeiffer, 1858)
- Species Helix desmarestina Brongniart, 1810 † accepted as Strobilops desmarestinus (Brongniart, 1810) †
- Species Helix desmoulinsii Farines, 1834 accepted as Corneola desmoulinsii (Farines, 1834)
- Species Helix desoudiniana Crosse, 1862 † accepted as Otala desoudiniana (Crosse, 1862) †
- Species Helix despecta G. B. Sowerby I, 1839 accepted as Acusta despecta (G. B. Sowerby I, 1839)
- Species Helix despicta Locard, 1899
- Species Helix despreauxii A. d'Orbigny, 1839 accepted as Obelus despreauxii (A. d'Orbigny, 1839)
- Species Helix destituta L. Pfeiffer, 1853 accepted as Candidula spadae (Calcara, 1845)
- Species Helix detecta A. Férussac, 1827 accepted as Harmogenanina detecta (A. Férussac, 1827)
- Species Helix detrita O. F. Müller, 1774 accepted as Zebrina detrita (O. F. Müller, 1774)
- Species Helix detrita Montagu, 1803 accepted as Bulimulus guadalupensis (Bruguière, 1789)
- Species Helix deucalionis Eichwald, 1829 †
- Species Helix deupesii Noulet, 1854 † accepted as Monacha (Monacha) deupesii (Noulet, 1854) †
- Species Helix devauxii Debeaux, 1863
- Species Helix devexa Reuss, 1861 † accepted as Apula devexa (Reuss, 1861) †
- Species Helix devia A. Gould, 1846 accepted as Cryptomastix devia (A. Gould, 1846)
- Species Helix dhericourtiana Bourguignat, 1885 accepted as Lejeania dhericourtiana (Bourguignat, 1885)
- Species Helix diabloensis J. G. Cooper, 1869 accepted as Helminthoglypta diabloensis (J. G. Cooper, 1869)
- Species Helix dianae L. Pfeiffer, 1856 accepted as Pseudohelenoconcha dianae (L. Pfeiffer, 1856)
- Species Helix diaphana I. Lea, 1834
- Species Helix diaphana Lamarck, 1822 accepted as Cepolis boriquenae H. B. Baker, 1940
- Species Helix diaphana Krynicki, 1833 accepted as Oxychilus diaphanellus (Krynicki, 1836)
- Species Helix diarti Cossmann, 1907 † accepted as Coneulota diarti (Cossmann, 1907) †
- Species Helix dibotrion E. A. Bielz, 1860 accepted as Perforatella dibothrion (E. A. Bielz, 1860)
- Species Helix dicaela Morelet, 1865 accepted as Polypylis hemisphaerula (W. H. Benson, 1842)
- Species Helix dichroa L. Pfeiffer, 1846
- Species Helix dichrozona E. von Martens, 1885 accepted as Fruticicola dichrozona (E. von Martens, 1885)
- Species Helix dicroceri Bourguignat, 1881 † accepted as Tropidomphalus (Pseudochloritis) dicroceri (Bourguignat, 1881) †
- Species Helix dictaea E. von Martens, 1889 accepted as Metafruticicola dictaea (E. von Martens, 1889)
- Species Helix dictyodes L. Pfeiffer, 1847 accepted as Pararhytida dictyodes (L. Pfeiffer, 1847)
- Species Helix dictyonina Euthyme, 1885 accepted as Pararhytida mouensis (Crosse, 1868)
- Species Helix diemenensis J. C. Cox, 1868 accepted as Thryasona diemenensis (J. C. Cox, 1868)
- Species Helix diensis Maltzan, 1883 accepted as Xerocrassa diensis (Maltzan, 1883)
- Species Helix dierama L. Pfeiffer, 1846
- Species Helix diespiter Dall, 1890 † accepted as Pleurodontites diespiter (Dall, 1890) †
- Species Helix difficilis Reeve, 1854 accepted as Chloraea difficilis (Reeve, 1854)
- Species Helix digueti Mabille, 1895 accepted as Greggelix indigena (Mabille, 1895)
- Species Helix dilatata L. Pfeiffer, 1845 accepted as Lissembryon dilatatus (L. Pfeiffer, 1845)
- Species Helix dillwyniana L. Pfeiffer, 1853 accepted as Eremina dillwyniana (L. Pfeiffer, 1853)
- Species Helix diluta L. Pfeiffer, 1842 accepted as Epiphragmophora diluta (L. Pfeiffer, 1842)
- Species Helix diluvii A. Braun, 1847 †
- Species Helix dimera Jonas, 1846 accepted as Helicostyla dimera (Jonas, 1846)
- Species Helix dimidiata De Cristofori & Jan, 1832
- Species Helix diminuta C. B. Adams, 1849 accepted as Strialuna sincera (C. B. Adams, 1845)
- Species Helix dimorpha Reeve, 1852 accepted as Allodiscus dimorphus (Reeve, 1852)
- Species Helix dimorpha L. Pfeiffer, 1853 accepted as Allodiscus dimorphus (Reeve, 1852)
- Species Helix diniensis Rambur, 1868
- Species Helix diodonstoma Bourguignat, 1862 accepted as Glischrus (Helix) holosericea S. Studer, 1820
- Species Helix diodonta Say, 1824 accepted as Appalachina sayana (Pilsbry & Ferriss, 1906)
- Species Helix diodontina Heude, 1885 accepted as Eostrobilops diodontina (Heude, 1885)
- Species Helix diomedes Brazier, 1877 accepted as Letitia diomedes (Brazier, 1877)
- Species Helix dionaea Deshayes, 1850 accepted as Trachystyla cryptica dionaea (Deshayes, 1850)
- Species Helix dioscoricola C. B. Adams, 1845 accepted as Pupisoma dioscoricola (C. B. Adams, 1845)
- Species Helix diplodon W. H. Benson, 1859 accepted as Sesara diplodon (W. H. Benson, 1859)
- Species Helix diptyx O. Boettger, 1869 † accepted as Eostrobilops diptyx (O. Boettger, 1869) †
- Species Helix direpta Dall, 1890 † accepted as Cepolis direpta (Dall, 1890) †
- Species Helix dirphica E. von Martens, 1876 accepted as Monacha dirphica (E. von Martens, 1876)
- Species Helix discerpta Deshayes, 1863 † accepted as Grandipatula discerpta (Deshayes, 1863) †
- Species Helix discobolus Shuttleworth, 1852 accepted as Canariella discobolus (Shuttleworth, 1852)
- Species Helix discoides R. P. Lesson, 1831
- Species Helix discolor A. Férussac, 1821 accepted as Pleurodonte discolor (A. Férussac, 1821)
- Species Helix discordialis Deshayes, 1839 accepted as Chloritis discordialis (Deshayes, 1839)
- Species Helix discors Petterd, 1902 accepted as Paralaoma caputspinulae (Reeve, 1852)
- Species Helix discrepans L. Pfeiffer, 1863 accepted as Poecilozonites circumfirmatus (Redfield, 1853)
- Species Helix discrepans Tiberi, 1878 accepted as Cernuella neglecta (Draparnaud, 1805)
- Species Helix disculus A. Braun, 1851 † accepted as Discus disculus (A. Braun, 1851) †
- Species Helix disculus L. Pfeiffer, 1850 accepted as Hiona exaequata (A. Gould, 1846)
- Species Helix discus Thomä, 1845 † accepted as Archaegopis discus (Thomä, 1845) †
- Species Helix discus Deshayes, 1850 accepted as Obba parmula (Broderip, 1841)
- Species Helix disparilis Deshayes, 1863 † accepted as Janulus disparilis (Deshayes, 1863) †
- Species Helix disparilis Ancey, 1898
- Species Helix dispersa Gassies, 1863 accepted as Andrefrancia dispersa (Gassies, 1863)
- Species Helix dissidens Deshayes, 1850 accepted as Haplotrema concavum (Say, 1821)
- Species Helix dissimilis A. d'Orbigny, 1835 accepted as Stephanoda dissimilis (A. d'Orbigny, 1835)
- Species Helix dissita Deshayes, 1850 accepted as Hispaniolana dissita (Deshayes, 1850)
- Species Helix distans Pease, 1866 accepted as Nesophila distans (Pease, 1866)
- Species Helix distans E. von Martens, 1876 accepted as Josephinella subzonata distans (E. von Martens, 1876)
- Species Helix distensa Mousson, 1872 accepted as Hemicycla distensa (Mousson, 1872)
- Species Helix distincta L. Pfeiffer, 1850 accepted as Hemiplecta distincta (L. Pfeiffer, 1850)
- Species Helix distorta Jonas, 1843 accepted as Lamelliger distorta (Jonas, 1843)
- Species Helix diulfensis Jaeckel, 1954 accepted as Levantina djulfensis (Dubois de Montpéreux, 1840)
- Species Helix divesta A. Gould, 1851 accepted as Neohelix divesta (A. Gould, 1851)
- Species Helix divionensis J. Martin, 1866 † accepted as Plebecula divionensis (J. Martin, 1866) †
- Species Helix divisa Forbes, 1851 accepted as Zagmena divisa (Forbes, 1851)
- Species Helix djulfensis Dubois de Montpéreux, 1840 accepted as Levantina djulfensis (Dubois de Montpéreux, 1840)
- Species Helix dobrudschae Kobelt, 1877 accepted as Xerolenta obvia (Menke, 1828)
- Species Helix doderleiniana Monterosato, 1869 † accepted as Campylaea (Allolaemus) doderleiniana (Monterosato, 1869) †
- Species Helix dohrni Paulucci, 1882 accepted as Xerosecta dohrni (Paulucci, 1882)
- Species Helix dolata L. Pfeiffer, 1841 accepted as Dentellaria pachygastra (J. E. Gray, 1834)
- Species Helix doliolum L. Pfeiffer, 1846 accepted as Kaliella doliolum (L. Pfeiffer, 1846)
- Species Helix doliolum Gredler, 1886 accepted as Pseudobuliminus doliolum (Gredler, 1886)
- Species Helix domestica Strøm, 1765 accepted as Vitrina pellucida (O. F. Müller, 1774)
- Species Helix dometi Denainvilliers, 1875 † accepted as Klikia dometi (Denainvilliers, 1875) †
- Species Helix dominicensis L. Pfeiffer, 1850 accepted as Hispaniolana dominicensis (L. Pfeiffer, 1850)
- Species Helix dorbignyana Matheron, 1843 † accepted as Megalotachea turonensis (Deshayes, 1832) †
- Species Helix doriae Dohrn, 1881 accepted as Mesanella monochroa doriae (Dohrn, 1881)
- Species Helix dormiens Benoit, 1859
- Species Helix dormitans Heude, 1882 accepted as Ganesella dormitans (Heude, 1882)
- Species Helix dormitoris (Kobelt, 1898)
- Species Helix dorri Wattebled, 1886 accepted as Kaliella dorri (Wattebled, 1886)
- Species Helix doufourii Grateloup, 1840
- Species Helix doumeti Bourguignat, 1876 accepted as Xeroplana doumeti (Bourguignat, 1876)
- Species Helix downieana Bland, 1861 accepted as Inflectarius downieanus (Bland, 1861)
- Species Helix dragorichi L. Pfeiffer, 1868
- Species Helix draparnaldi H. Beck, 1837 accepted as Oxychilus draparnaudi (H. Beck, 1837)
- Species Helix draparnaldi Cuvier, 1816 accepted as Phenacolimax major (A. Férussac, 1807)
- Species Helix draparnaudi Sheppard, 1823 accepted as Gyraulus (Gyraulus) draparnaudi (Sheppard, 1823)
- Species Helix dravica Servain, 1889
- Species Helix draxleri Kobelt, 1879 accepted as Monacha rothii (L. Pfeiffer, 1841)
- Species Helix drepanensis L. Pfeiffer, 1857 accepted as Marmorana muralis drepanensis (L. Pfeiffer, 1857)
- Species Helix dringi L. Pfeiffer, 1846 accepted as Rhagada dringi (L. Pfeiffer, 1846)
- Species Helix drouetiana Morelet, 1860 accepted as Leptaxis drouetiana (Morelet, 1860)
- Species Helix drouetii de Boissy, 1839 † accepted as Archaeoxesta drouetii (de Boissy, 1839) †
- Species Helix drunasiana Locard, 1894 accepted as Trochulus hispidus (Linnaeus, 1758)
- Species Helix dryanderensis J. C. Cox, 1872 accepted as Offachloritis dryanderensis (J. C. Cox, 1872)
- Species Helix dryope Broderip, 1841 accepted as Chloraea dryope (Broderip, 1841)
- Species Helix dschulfensii Dubois, 1857 accepted as Levantina djulfensis (Dubois de Montpéreux, 1840)
- Species Helix dschulfensii Bourguignat, 1857 accepted as Helix djulfensis Dubois de Montpéreux, 1840
- Species Helix dubia Deshayes, 1824 †
- Species Helix dubia Clessin, 1874
- Species Helix dubia J. W. Taylor, 1880
- Species Helix dubiosa L. Pfeiffer, 1846 accepted as Helicostyla dubiosa (L. Pfeiffer, 1846)
- Species Helix duboisii W. H. Baily, 1858 †
- Species Helix duclosiana A. Férussac, 1822 accepted as Plagioptycha duclosiana (A. Férussac, 1822)
- Species Helix ducrosti Locard, 1883 † accepted as Frechenia ducrosti (Locard, 1883) †
- Species Helix ductilis L. Pfeiffer, 1857
- Species Helix dufrenoyii Matheron, 1843 † accepted as Leucochroopsis dufrenoyii (Matheron, 1843) †
- Species Helix duiensis Westerlund, 1897 accepted as Karaftohelix duiensis (Westerlund, 1897)
- Species Helix dumasi de Boissy, 1848 † accepted as Acanthinula dumasi (de Boissy, 1848) †
- Species Helix dumesniliana Bourguignat, 1869 †
- Species Helix dumeticola W. H. Benson, 1851 accepted as Nata dumeticola (W. H. Benson, 1851)
- Species Helix dumivaga Morelet, 1880 accepted as Xerotricha conspurcata (Draparnaud, 1801)
- Species Helix dumonti L. Pfeiffer, 1846 accepted as Phengus dumonti (L. Pfeiffer, 1846)
- Species Helix dumonti Mortillet, 1853
- Species Helix dumortieriana Crosse, 1862 † accepted as Otala jobaeana dumortieriana (Crosse, 1862) †
- Species Helix dunkeri Reeve, 1852 accepted as Labyrinthus dunkeri (Reeve, 1852)
- Species Helix dunkiensis Forbes, 1852 accepted as Spurlingia dunkiensis (Forbes, 1852)
- Species Helix dunniae J. E. Gray, 1840 accepted as Amborhytida dunniae (J. E. Gray, 1840)
- Species Helix dupetithouarsi Deshayes, 1839 accepted as Helminthoglypta dupetithouarsi (Deshayes, 1839)
- Species Helix duplocincta E. von Martens, 1879 accepted as Ponsadenia duplocincta (E. von Martens, 1879)
- Species Helix duponti Morelet, 1866 accepted as Plegma duponti (Morelet, 1866)
- Species Helix duporti Bavay & Dautzenberg, 1909 accepted as Neotrachia duporti (Bavay & Dautzenberg, 1909)
- Species Helix dupotetiana Terver, 1839
- Species Helix dupuyana L. Pfeiffer, 1851 accepted as Thersites novaehollandiae (J. E. Gray, 1834)
- Species Helix dura L. Pfeiffer, 1864 accepted as Hemiplecta dura (L. Pfeiffer, 1864)
- Species Helix duralensis J. C. Cox, 1868 accepted as Pommerhelix duralensis (J. C. Cox, 1868)
- Species Helix duranti Newcomb, 1864 accepted as Haplotrema duranti (Newcomb, 1864)
- Species Helix durbani F. E. Edwards, 1852 † accepted as Archygromia durbani (F. E. Edwards, 1852) †
- Species Helix durieui L. Pfeiffer, 1848 accepted as Xeromunda durieui (L. Pfeiffer, 1848)
- Species Helix duroi Hidalgo, 1886 accepted as Eremina duroi (Hidalgo, 1886)
- Species Helix durvillii Hombron & Jacquinot, 1841 accepted as Xanthomelon durvillii (Hombron & Jacquinot, 1841)
- Species Helix duvalii Petit de la Saussaye, 1844 accepted as Ampelita duvalii (Petit de la Saussaye, 1844)
- Species Helix duvalii Michaud, 1862 † accepted as Eostrobilops duvalii (Michaud, 1862) †
- Species Helix duvauxii Deshayes, 1832 † accepted as Megalotachea turonensis (Deshayes, 1832) †
- Species Helix dyeri Petterd, 1879 accepted as Prolesophanta dyeri (Petterd, 1879)
- Species Helix dysoni Shuttleworth, 1852 accepted as Polygyra dysoni (Shuttleworth, 1852)
- Species Helix eastlakeana Möllendorff, 1882 accepted as Moellendorffia eastlakeana (Möllendorff, 1882)
- Species Helix eburnea Megerle von Mühlfeld, 1824 accepted as Melanella eburnea (Megerle von Mühlfeld, 1824)
- Species Helix ebusitana Hidalgo, 1869 accepted as Xerocrassa ebusitana (Hidalgo, 1869)
- Species Helix echinophora Deshayes, 1850 accepted as Helicophanta echinophora (Deshayes, 1850)
- Species Helix eddystonensis Reeve, 1854 accepted as Papuina eddystonensis (Reeve, 1854)
- Species Helix edentula Draparnaud, 1805 accepted as Edentiella edentula (Draparnaud, 1805)
- Species Helix edetanorum Servain, 1880 accepted as Cernuella virgata (Da Costa, 1778)
- Species Helix edgariana W. H. Benson, 1853 accepted as Ratnadvipia edgariana (W. H. Benson, 1853)
- Species Helix edulis Monterosato, 1892
- Species Helix edvardsi Bland, 1858 accepted as Stenotrema edvardsi (Bland, 1858)
- Species Helix edwardsi J. C. Cox, 1868 accepted as Xanthomelon jannellei (Le Guillou, 1842)
- Species Helix edwardsi Deshayes, 1863 † accepted as Hartmutix edwardsi (Deshayes, 1863) †
- Species Helix efferata Mousson, 1872 accepted as Hemicycla efferata (Mousson, 1872)
- Species Helix effusa L. Pfeiffer, 1866 accepted as Suavitas monteplatonis Pilsbry, 1931
- Species Helix egena Say, 1825 accepted as Euconulus fulvus egenus (Say, 1825)
- Species Helix egenula Morelet, 1848 accepted as Trochozonites egenulus (Morelet, 1848)
- Species Helix egesta J. E. Gray, 1850 accepted as Egestula egesta (J. E. Gray, 1850)
- Species Helix egregia Deshayes, 1850
- Species Helix ehingensis Klein, 1846 † accepted as Galactochiloides ehingensis (Klein, 1846) †
- Species Helix eichwaldi L. Pfeiffer, 1846 accepted as Caucasigena eichwaldi (L. Pfeiffer, 1846)
- Species Helix ekongensis Angas, 1877 accepted as Kalidos ekongensis (Angas, 1877)
- Species Helix elachystoma E. von Martens, 1878 accepted as Rhagada elachystoma (E. von Martens, 1878)
- Species Helix elaphra Mabille, 1883
- Species Helix elata Rossmässler, 1837 accepted as Trochoidea caroni (Deshayes, 1832)
- Species Helix electrina A. Gould, 1841 accepted as Perpolita electrina (Gould, 1841)
- Species Helix electrina Hombron & Jacquinot, 1847
- Species Helix elegans Gmelin, 1791 accepted as Trochoidea elegans (Gmelin, 1791)
- Species Helix elegantissima L. Pfeiffer, 1849 accepted as Plectotropis elegantissima (L. Pfeiffer, 1849)
- Species Helix elegantula L. Pfeiffer, 1867 accepted as Chanomphalus pilsbryi (H. B. Baker, 1922)
- Species Helix elevata Say, 1821 accepted as Mesodon elevatus (Say, 1821)
- Species Helix elevata A. d'Orbigny, 1835 accepted as Helix paraguayana L. Pfeiffer, 1842
- Species Helix elisula Locard, 1894 † accepted as Trochulus hispidus (Linnaeus, 1758)
- Species Helix elliotti Redfield, 1858 accepted as Zonitoides elliotti (Redfield, 1858)
- Species Helix ellipsostoma Reeve, 1854 accepted as Labyrinthus ellipsostomus (Reeve, 1854)
- Species Helix elliptica T. Brown, 1818 accepted as Vitrina pellucida (O. F. Müller, 1774)
- Species Helix elongata Röding, 1798 accepted as Mesembrinus elongatus (Röding, 1798)
- Species Helix elongata Razoumowsky, 1789
- Species Helix embritha Mabille, 1882 accepted as Hemicycla saulcyi (A. d'Orbigny, 1839)
- Species Helix emiliana Reeve, 1852 accepted as Euplecta emiliana (Reeve, 1852)
- Species Helix eminens Westerlund, 1888
- Species Helix emma L. Pfeiffer, 1863 accepted as Ganesella emma (L. Pfeiffer, 1863)
- Species Helix emmae Pallary, 1899
- Species Helix emoriens Gredler, 1881 accepted as Sinicola emoriens (Gredler, 1881)
- Species Helix empeda Mabille, 1882 accepted as Hemicycla glasiana (Shuttleworth, 1852)
- Species Helix endoptycha E. von Martens, 1864 accepted as Vulnus endoptycha (E. von Martens, 1864)
- Species Helix engaddensis Bourguignat, 1852
- Species Helix engonata Shuttleworth, 1852 accepted as Canaridiscus engonatus (Shuttleworth, 1852)
- Species Helix enica Letourneux & Bourguignat, 1887 accepted as Xeroplana enica (Letourneux & Bourguignat, 1887)
- Species Helix entela Bourguignat, 1881 † accepted as Cepaea eversa larteti (de Boissy, 1840) †
- Species Helix entodonta L. Pfeiffer, 1859 accepted as Zilchistrophia entodonta (L. Pfeiffer, 1859)
- Species Helix entomostoma Hombron & Jacquinot, 1841 accepted as Entomostoma entomostoma (Hombron & Jacquinot, 1841)
- Species Helix eoa Crosse, 1868 accepted as Euhadra eoa (Crosse, 1868)
- Species Helix ephamilla E. A. Smith, 1895 accepted as Disteustoma ephamilla (E. A. Smith, 1895)
- Species Helix ephedrophila Mabille, 1883 accepted as Hemicycla consobrina (A. Férussac, 1822)
- Species Helix ephora Mabille, 1882 accepted as Hemicycla consobrina (A. Férussac, 1822)
- Species Helix epidermia Anton, 1838
- Species Helix epistyliulum C. B. Adams, 1849 accepted as Microsagda epistyliulum (C. B. Adams, 1849)
- Species Helix epistylium O. F. Müller, 1774 accepted as Sagda epistylium (O. F. Müller, 1774)
- Species Helix epixantha L. Pfeiffer, 1850 accepted as Bradybaena similaris (A. Férussac, 1822)
- Species Helix epsilon L. Pfeiffer, 1853 accepted as Paralaoma servilis (Shuttleworth, 1852)
- Species Helix equestrata J. Moricand, 1858 accepted as Isomeria equestrata (J. Moricand, 1858)
- Species Helix equitum Bourguignat, 1876 accepted as Helix asemnis Bourguignat, 1860
- Species Helix ercica Benoit, 1859 accepted as Morlina glabra ercica (Benoit, 1859)
- Species Helix erdelii J. R. Roth, 1839 accepted as Pleurodiscus balmei (Potiez & Michaud, 1838)
- Species Helix erecta Mousson, 1873 accepted as Labyrinthus subplanatus erectus (Mousson, 1873)
- Species Helix eremophila L. Pfeiffer, 1853 accepted as Xerocrassa eremophila (L. Pfeiffer, 1853)
- Species Helix ergilensis Galland, 1885
- Species Helix ericetorum O. F. Müller, 1774 accepted as Helicella itala itala (Linnaeus, 1758)
- Species Helix erinaceus L. Pfeiffer, 1861 accepted as Helix eustoma L. Pfeiffer, 1857
- Species Helix erkelii Kobelt, 1878 accepted as Xerocrassa erkelii (Kobelt, 1878)
- Species Helix erronea Albers, 1853 accepted as Corilla erronea (Albers, 1853)
- Species Helix erubescens R. T. Lowe, 1831 accepted as Leptaxis simia (A. Férussac, 1832)
- Species Helix erubescens Solander, 1786 accepted as Strophocheilus pudicus (O. F. Müller, 1774)
- Species Helix erycina Gistel, 1848
- Species Helix erythromorpha Mabille, 1884
- Species Helix erythronixia Kobelt, 1876 accepted as Theba subdentata dehnei (Rossmässler, 1846)
- Species Helix erythrostoma Beck, 1837 accepted as Theba subdentata helicella (W. Wood, 1828)
- Species Helix esau Gredler, 1887 accepted as Ganesella esau (Gredler, 1887)
- Species Helix escheriana Bourguignat, 1864 accepted as Levantina escheriana (Bourguignat, 1864)
- Species Helix escherichi O. Boettger, 1898 accepted as Maltzanella escherichi (O. Boettger, 1898)
- Species Helix escoffierae Fontannes, 1880 † accepted as Apula escoffierae (Fontannes, 1880) †
- Species Helix espiloca Bland, 1860 accepted as Daedalochila postelliana (Bland, 1859)
- Species Helix esserana Fagot, 1887 accepted as Pyrenaearia carascalopsis esserana (Fagot, 1888)
- Species Helix estella A. d'Orbigny, 1835 accepted as Epiphragmophora estella (A. d'Orbigny, 1835)
- Species Helix eta L. Pfeiffer, 1853 accepted as Mocella eta (L. Pfeiffer, 1853)
- Species Helix ethelema Mabille, 1882 accepted as Hemicycla ethelema (Mabille, 1882)
- Species Helix etheridgei Brazier, 1877 accepted as Bentosites etheridgei (Brazier, 1877)
- Species Helix etrusca Rossmässler, 1835 accepted as Cepaea nemoralis etrusca (Rossmässler, 1835)
- Species Helix eucalypta Mabille, 1883 accepted as Hemicycla ethelema (Mabille, 1882)
- Species Helix eucharis Deshayes, 1850 accepted as Kalidos eucharis (Deshayes, 1850)
- Species Helix euchroes L. Pfeiffer, 1854
- Species Helix euchromia Bourguignat, 1857
- Species Helix eucineta Bourguignat, 1857 accepted as Codringtonia eucineta (Bourguignat, 1857)
- Species Helix euclasta Shuttleworth, 1854 accepted as Euclastaria musicola euclasta (Shuttleworth, 1854)
- Species Helix euclastolena Mabille, 1880
- Species Helix eudeli Deshayes, 1863 accepted as Louisia barclayi (W. H. Benson, 1850)
- Species Helix euetha Cafici, 1884
- Species Helix eugenia L. Pfeiffer, 1853 accepted as Marmorana globularis eugeniae (L. Pfeiffer, 1853)
- Species Helix euglypha Reuss, 1849 † accepted as Discus euglyphus (Reuss, 1849) †
- Species Helix euglypha Locard, 1899 accepted as Xerosecta promissa (Westerlund, 1892)
- Species Helix euglypholena Bourguignat, 1881 † accepted as Hemicycla asperula leymerieana (Noulet, 1854) †
- Species Helix eumenes Westerlund, 1883 accepted as Trishoplita eumenes (Westerlund, 1883)
- Species Helix eumicron Deshayes, 1863 †
- Species Helix euomphalus W. T. Blanford & H. F. Blanford, 1861 accepted as Pyramidula euomphalus (W. T. Blanford & H. F. Blanford, 1861)
- Species Helix eupaecilia Bourguignat, 1857
- Species Helix eurabdolena Mabille, 1883
- Species Helix eurabdota Fontannes, 1884 †
- Species Helix eurydice A. Gould, 1846 accepted as Trochomorpha eurydice (A. Gould, 1846)
- Species Helix euryomphala L. Pfeiffer, 1845 accepted as Mesomphix euryomphala (L. Pfeiffer, 1845)
- Species Helix eusarcosoma Servain, 1884 accepted as Helix pomatia Linnaeus, 1758
- Species Helix euspira Reeve, 1854 accepted as Happia euspira (Reeve, 1854)
- Species Helix eustoma L. Pfeiffer, 1857 accepted as Chloritis (Eustomopsis) eustoma (L. Pfeiffer, 1857)
- Species Helix eustrongyla Bourguignat, 1868 † accepted as Cernuella eustrongyla (Bourguignat, 1868) †
- Species Helix euterpe L. Pfeiffer, 1861 accepted as Tanychlamys euterpe (L. Pfeiffer, 1861)
- Species Helix eutrapela Bourguignat, 1881 † accepted as Hemicycla asperula leymerieana (Noulet, 1854) †
- Species Helix eutropis L. Pfeiffer, 1861 accepted as Canariella eutropis (L. Pfeiffer, 1861)
- Species Helix eva Reeve, 1853 accepted as Dendrotrochus eva (Reeve, 1853)
- Species Helix evansi Meek & Hayden, 1860 †
- Species Helix evanstonensis C. A. White, 1878 † accepted as Helicina evanstonensis (C. A. White, 1878) †
- Species Helix everetti H. Adams, 1873
- Species Helix evergasta Mabille, 1882 accepted as Hemicycla pouchet (A. Férussac, 1821)
- Species Helix evergeta Mabille, 1882
- Species Helix everia Mabille, 1882 accepted as Canariella everia (Mabille, 1882)
- Species Helix eversa Deshayes, 1851 † accepted as Palaeotachea turonensis (Deshayes, 1832) †
- Species Helix exacta L. Pfeiffer, 1863
- Species Helix exaequata A. Gould, 1846 accepted as Hiona exaequata (A. Gould, 1846)
- Species Helix exaereta Bourguignat, 1881 † accepted as Cepaea eversa larteti (de Boissy, 1840) †
- Species Helix exagitans J. C. Cox, 1870 accepted as Cryptocharopa exagitans (J. C. Cox, 1870)
- Species Helix exaltata L. Pfeiffer, 1855 accepted as Trochomorpha exaltata (L. Pfeiffer, 1855)
- Species Helix exanimata Mabille, 1883
- Species Helix exarata L. Pfeiffer, 1857 accepted as Helminthoglypta exarata (L. Pfeiffer, 1857)
- Species Helix excavata Alder, 1830 accepted as Zonitoides excavatus (Alder, 1830)
- Species Helix excavata Hombron & Jacquinot, 1841
- Species Helix excellens L. Pfeiffer, 1853 accepted as Caracolus excellens (L. Pfeiffer, 1853)
- Species Helix excentrica L. Pfeiffer, 1845 accepted as Vitrinula excentrica (L. Pfeiffer, 1845)
- Species Helix exceptiuncula A. Férussac, 1823 accepted as Planispira exceptiuncula (A. Férussac, 1823)
- Species Helix excisa Reeve, 1854 accepted as Hirtudiscus excisa (Reeve, 1854)
- Species Helix exclusa Quoy & Gaimard, 1825 accepted as Trochomorpha exclusa (Quoy & Gaimard, 1825)
- Species Helix excoriata E. von Martens, 1883 accepted as Ampelita sepulcralis (A. Férussac, 1821)
- Species Helix exigua W. Stimpson, 1850 accepted as Striatura (Pseudohyalina) exigua (W. Stimpson, 1850)
- Species Helix exigua R. A. Philippi, 1855 accepted as Radiodiscus exiguus (R. A. Philippi, 1855)
- Species Helix exilis Gmelin, 1791 accepted as Bulimulus guadalupensis (Bruguière, 1789)
- Species Helix exilis O. F. Müller, 1774 accepted as Ariophanta exilis (O. F. Müller, 1774)
- Species Helix eximia L. Pfeiffer, 1844 accepted as Lysinoe eximia (L. Pfeiffer, 1844)
- Species Helix exocarpi J. C. Cox, 1868 accepted as Pommerhelix exocarpi (J. C. Cox, 1868)
- Species Helix exochia Bourguignat, 1881 † accepted as Cepaea eversa larteti (de Boissy, 1840) †
- Species Helix exoleta A. Gould, 1851 accepted as Mesodon zaletus (A. Binney, 1837)
- Species Helix exoptata Tate, 1882
- Species Helix exornata Deshayes, 1850
- Species Helix expansa L. Pfeiffer, 1861 accepted as Cristigibba expansa (L. Pfeiffer, 1861)
- Species Helix expansa Clessin, 1874
- Species Helix expansilabris F. Sandberger, 1858 † accepted as Cyrtochilus expansilabris (F. Sandberger, 1858) †
- Species Helix expedenta Locard, 1899 accepted as Xeroplexa intersecta (Poiret, 1801)
- Species Helix expeditionis J. C. Cox, 1868 accepted as Galadistes expeditionis (J. C. Cox, 1868)
- Species Helix explanata O. F. Müller, 1774 accepted as Xerosecta explanata (O. F. Müller, 1774)
- Species Helix explanata Quoy & Gaimard, 1832
- Species Helix expolita Deshayes, 1850
- Species Helix exquisita Deshayes, 1850
- Species Helix exserta L. Pfeiffer, 1856
- Species Helix exstincta Rambur, 1862 † accepted as Pseudochloritis incrassata exstincta (Rambur, 1862) †
- Species Helix extensa O. F. Müller, 1774 accepted as Crystallopsis extensa (O. F. Müller, 1774)
- Species Helix extincta [sic] † accepted as Pseudochloritis incrassata exstincta (Rambur, 1862) †
- Species Helix extrema Westerlund, 1898 accepted as Vallonia pulchella (O. F. Müller, 1774)
- Species Helix extricanda Tapparone Canefri, 1883
- Species Helix exul Theobald, 1864 accepted as Tanychlamys exul (Theobald, 1864)
- Species Helix eydouxi Hidalgo, 1887 accepted as Chloraea eydouxi (Hidalgo, 1887)
- Species Helix eygalierensis Roman, 1899 † accepted as Monacha (Monacha) eygalierensis (Roman, 1899) †
- Species Helix eyrei H. Adams & Angas, 1876 accepted as Lacustrelix eyrei (H. Adams & Angas, 1876)
- Species Helix faba Gmelin, 1791 accepted as Partula faba (Gmelin, 1791)
- Species Helix faberiana Möllendorff, 1888 accepted as Moellendorffiella faberiana (Möllendorff, 1888)
- Species Helix fabrefacta Pease, 1865 accepted as Nesodiscus fabrefactus (Pease, 1865)
- Species Helix fabrei F. Sandberger, 1873 † accepted as Pseudoleptaxis fabrei (F. Sandberger, 1873) †
- Species Helix facilis F. Sandberger, 1875 † accepted as Cepaea facilis (F. Sandberger, 1875) †
- Species Helix faciola Draparnaud, 1801 accepted as Helix fasciola Draparnaud, 1801
- Species Helix facta Newcomb, 1864 accepted as Micrarionta facta (Newcomb, 1864)
- Species Helix fallaciosa A. Férussac, 1832 accepted as Trachia fallaciosa (A. Férussac, 1832)
- Species Helix fallax Say, 1825 accepted as Triodopsis fallax (Say, 1825)
- Species Helix fallax Melleville, 1843 † accepted as Phacozonites luna (Michaud, 1837) †
- Species Helix fanulus L. Pfeiffer, 1856 accepted as Gulella fanulus (L. Pfeiffer, 1856)
- Species Helix faradensis L. Pfeiffer, 1861
- Species Helix farquhari Melvill & Ponsonby, 1892 accepted as Phaulocystis farquhari (Melvill & Ponsonby, 1892)
- Species Helix farrisi L. Pfeiffer, 1859 accepted as Pilsbrya farrisi (L. Pfeiffer, 1859)
- Species Helix fasciata J. Adams, 1800 accepted as Lacuna parva (da Costa, 1778)
- Species Helix fascicularis Gmelin, 1791 accepted as Valvata piscinalis (O. F. Müller, 1774)
- Species Helix fasciola Draparnaud, 1801 accepted as Cathaica fasciola (Draparnaud, 1801)
- Species Helix fasciolata Spix, 1827 accepted as Asolene crassa (Swainson, 1823)
- Species Helix fasciolata R. P. Lesson, 1831 accepted as Planispira zonaria (Linnaeus, 1767)
- Species Helix fastigiata T. Hutton, 1838 accepted as Kaliella fastigiata (T. Hutton, 1838)
- Species Helix fastosa Albers, 1854 accepted as Acavus haemastoma (Linnaeus, 1758)
- Species Helix fathallae Nägele, 1901
- Species Helix fatigata J. C. Cox, 1873 accepted as Trochomorpha fatigata (J. C. Cox, 1873)
- Species Helix fatua L. Pfeiffer, 1857 sensu F. W. Hutton, 1882 accepted as Phrixgnathus celia F. W. Hutton, 1883
- Species Helix fatua L. Pfeiffer, 1857 accepted as Therasiella celinde (J. E. Gray, 1850)
- Species Helix faunus R. A. Philippi, 1851 accepted as Isomeria faunus (R. A. Philippi, 1851)
- Species Helix faunus Broderip, 1841 accepted as Helicostyla faunus (Broderip, 1841)
- Species Helix fausta R. T. Lowe, 1831 accepted as Actinella fausta (R. T. Lowe, 1831)
- Species Helix faustina Rossmässler, 1835 accepted as Faustina faustina (Rossmässler, 1835)
- Species Helix febigeri Bland, 1866 accepted as Polygyra cereolus (Megerle von Mühlfeld, 1818)
- Species Helix febrilis W. T. Blanford & H. F. Blanford, 1861 accepted as Philalanka febrilis (W. T. Blanford & H. F. Blanford, 1861)
- Species Helix fedtschenkoi E. von Martens, 1874 accepted as Fruticicola fedtschenkoi (E. von Martens, 1874)
- Species Helix feisthamelii Hupé, 1853 accepted as Solaropsis feisthamelii (Hupé, 1853)
- Species Helix feneriffensis H. Adams & Angas, 1876 accepted as Kalidos feneriffensis (H. Adams & Angas, 1876)
- Species Helix fenestrata G. B. Sowerby I, 1841 accepted as Pachysphaera fenestrata (G. B. Sowerby I, 1841)
- Species Helix fenestrata J. C. Cox, 1866 accepted as Hedleyoconcha delta (L. Pfeiffer, 1857)
- Species Helix feralis Hemphill, 1901 accepted as Micrarionta feralis (Hemphill, 1901)
- Species Helix ferculum Deshayes, 1863 † accepted as Discus ferculum (Deshayes, 1863) †
- Species Helix ferensis [sic] † accepted as Helix ferrensis de Serres, 1851 †
- Species Helix fernandezi Hidalgo, 1890 accepted as Ganesella fernandezi (Hidalgo, 1890)
- Species Helix fernshawensis Petterd, 1879 accepted as Mulathena fordei (Brazier, 1871)
- Species Helix feroeli Servain, 1889 accepted as Arianta arbustorum (Linnaeus, 1758)
- Species Helix ferrantii Deshayes, 1824 † accepted as Discus ferrantii (Deshayes, 1824) †
- Species Helix ferrensis de Serres, 1851 †
- Species Helix ferretiana Bourguignat, 1883 accepted as Urguessella ferretiana (Bourguignat, 1883)
- Species Helix ferrieziana Crosse, 1868 accepted as Ptychorhytida ferrieziana (Crosse, 1868)
- Species Helix ferruginea I. Lea, 1840 accepted as Calocochlea cailliaudi (Deshayes, 1839)
- Species Helix ferussaci De Cristofori & Jan, 1832
- Species Helix festiva Donovan, 1825 accepted as Calocochlea festiva (Donovan, 1825)
- Species Helix ficta Pease, 1865 accepted as Nesodiscus fictus (Pease, 1865)
- Species Helix fidelis J. E. Gray, 1834 accepted as Monadenia fidelis (J. E. Gray, 1834)
- Species Helix fiesolensis Fagot, 1884
- Species Helix figulina Rossmässler, 1839
- Species Helix filaris L. Pfeiffer, 1845
- Species Helix filholi Bourguignat, 1874 † accepted as Eurystrophe filholi (Bourguignat, 1874) †
- Species Helix filia Mousson, 1861 accepted as Sphincterochila zonata filia (Mousson, 1861)
- Species Helix filicina L. Pfeiffer, 1841 accepted as Edentiella filicina (L. Pfeiffer, 1841)
- Species Helix filicosta L. Pfeiffer, 1845
- Species Helix filicum Krynicki, 1836 accepted as Oxychilus (Longiphallus) filicum (Krynicki, 1836)
- Species Helix filiola Deshayes, 1850 accepted as Ouagapia gradata (A. Gould, 1846)
- Species Helix filippina Heude, 1882 accepted as Laeocathaica filippina (Heude, 1882)
- Species Helix filocincta L. Pfeiffer, 1846 accepted as Inozonites filocinctus (L. Pfeiffer, 1846)
- Species Helix filosa Deshayes, 1850
- Species Helix fimbriata Bourguignat, 1852 accepted as Sphincterochila fimbriata (Bourguignat, 1852)
- Species Helix fimbriosa E. von Martens, 1875 accepted as Sinicola fimbriosa (E. von Martens, 1875)
- Species Helix finitima Morelet, 1876 accepted as Xerosecta finitima (Morelet, 1876)
- Species Helix finitimus Locard, 1899 accepted as Cernuella virgata (Da Costa, 1778)
- Species Helix fischeri Gassies, 1857 accepted as Rhytida inaequalis (Reeve, 1854)
- Species Helix flammata A. Férussac, 1821
- Species Helix flammea O. F. Müller, 1774 accepted as Limicolaria flammea (O. F. Müller, 1774)
- Species Helix flammigera L. Pfeiffer, 1854 accepted as Flammulina zebra (Le Guillou, 1842)
- Species Helix flattersiana Ancey, 1882
- Species Helix flava Eichwald, 1830 † accepted as Oxychilus flavus (Eichwald, 1830) †
- Species Helix flava Terver, 1839
- Species Helix flaveola E. von Martens, 1864
- Species Helix flaveola Kaleniczenko, 1853 accepted as Diplobursa flaveola (Kaleniczenko, 1853)
- Species Helix flavescens L. Pfeiffer, 1848 accepted as Praticolella flavescens (L. Pfeiffer, 1848)
- Species Helix flavida Rossmässler, 1839 accepted as Pleurodiscus balmei (Potiez & Michaud, 1838)
- Species Helix flavidula E. von Martens, 1867 accepted as Planispira flavidula (E. von Martens, 1867)
- Species Helix flavocincta Megerle von Mühlfeld, 1824 accepted as Eulima glabra (da Costa, 1778)
- Species Helix fleurati Bourguignat, 1868 accepted as Eobania vermiculata (O. F. Müller, 1774)
- Species Helix flexilabris L. Pfeiffer, 1856 accepted as Papuina flexilabris (L. Pfeiffer, 1856)
- Species Helix flexuosa L. Pfeiffer, 1855 accepted as Chloritis flexuosa (L. Pfeiffer, 1855)
- Species Helix flocculus Morelet, 1858 accepted as Punctum pygmaeum (Draparnaud, 1801)
- Species Helix flora L. Pfeiffer, 1850 accepted as Mesomphix flora (L. Pfeiffer, 1850)
- Species Helix flora Reeve, 1852 accepted as Happia flora (Reeve, 1852)
- Species Helix florentiae Kobelt, 1882 accepted as Xerotricha vatonniana (Bourguignat, 1867)
- Species Helix florentina Fagot, 1884
- Species Helix florida G. B. Sowerby I, 1841 accepted as Cochlodryas florida (G. B. Sowerby I, 1841)
- Species Helix florulifera Reeve, 1852 accepted as Daedalochila uvulifera (Shuttleworth, 1852)
- Species Helix flosculus J. C. Cox, 1866 accepted as Advena stoddartii flosculus (J. C. Cox, 1866)
- Species Helix fluctuata C. B. Adams, 1849 accepted as Lucerna chemnitziana (L. Pfeiffer, 1845)
- Species Helix fodiens L. Pfeiffer, 1844 accepted as Bradybaena fodiens (L. Pfeiffer, 1844)
- Species Helix foetens (S. Studer, 1820) accepted as Chilostoma zonatum foetens (S. Studer, 1820)
- Species Helix foetida T. Brown, 1827 accepted as Oxychilus alliarius (J. S. Miller, 1822)
- Species Helix folini Morelet, 1848 accepted as Trochozonites folini (Morelet, 1848)
- Species Helix folliculum Schröter, 1784 accepted as Ferussacia folliculum (Schröter, 1784)
- Species Helix fontana Lightfoot, 1786 accepted as Hippeutis complanatus (Linnaeus, 1758)
- Species Helix fontani Noulet, 1854 †
- Species Helix fontenillii Michaud, 1829 accepted as Delphinatia fontenillii (Michaud, 1829)
- Species Helix fontinalis Donovan, 1804 accepted as Stagnicola palustris (O. F. Müller, 1774)
- Species Helix forabilis W. H. Benson, 1859 accepted as Sophina forabilis (W. H. Benson, 1859)
- Species Helix forbesii J. C. Cox, 1864 accepted as Bentosites coxi (Crosse, 1866)
- Species Helix forbesii L. Pfeiffer, 1845
- Species Helix fordei Brazier, 1871 accepted as Mulathena fordei (Brazier, 1871)
- Species Helix foremaniana C. B. Adams, 1850 accepted as Sagda foremaniana (C. B. Adams, 1850)
- Species Helix forensis Wollaston, 1878 accepted as Leptaxis wollastoni forensis (Wollaston, 1878)
- Species Helix formosa W. Wood, 1828 accepted as Helicostyla mirabilis (A. Férussac, 1821)
- Species Helix formosensis L. Pfeiffer, 1866 accepted as Satsuma formosensis (L. Pfeiffer, 1866)
- Species Helix fornicata A. Gould, 1846
- Species Helix forrestiana Angas, 1875
- Species Helix forsteriana Reeve, 1852 accepted as Zyghelix forsteriana (Reeve, 1852)
- Species Helix fortis C. B. Adams, 1850 accepted as Dentellaria okeniana (L. Pfeiffer, 1845)
- Species Helix fortunata Shuttleworth, 1852 accepted as Canariella berthelotii berthelotii (A. d'Orbigny, 1836)
- Species Helix fortunei L. Pfeiffer, 1850 accepted as Bradybaena fortunei (L. Pfeiffer, 1850)
- Species Helix fortunei Heude, 1882
- Species Helix fossaria Montagu, 1803 accepted as Galba truncatula (O. F. Müller, 1774)
- Species Helix foullioyi Le Guillou, 1845 accepted as Hemiglyptopsis fouillioyi (Le Guillou, 1845)
- Species Helix fouquei A. Letourneux, 1884
- Species Helix fouresi Morlet, 1886 accepted as Trichochloritis fouresi (Morlet, 1886)
- Species Helix fourousi Bourguignat, 1863 accepted as Metafruticicola berytensis (L. Pfeiffer, 1841)
- Species Helix foveata Reeve, 1854
- Species Helix fragilis Linnaeus, 1758 accepted as Lymnaea fragilis (Linnaeus, 1758)
- Species Helix fragilis G. B. Sowerby I, 1841 accepted as Leytia leytensis (L. Pfeiffer, 1846)
- Species Helix fragilis L. Pfeiffer, 1839 accepted as Euclastaria debilis (L. Pfeiffer, 1856)
- Species Helix franciscanorum Gredler, 1886 accepted as Trichochloritis hungerfordiana franciscanorum (Gredler, 1886)
- Species Helix franklandiensis Forbes, 1852 accepted as Murphitella franklandiensis (Forbes, 1852)
- Species Helix frappieri Deshayes, 1863 accepted as Louisia barclayi (W. H. Benson, 1850)
- Species Helix fraseri J. E. Gray, 1833 accepted as Sphaerospira fraseri (J. E. Gray, 1833)
- Species Helix frater Dohrn & Heynemann, 1862 accepted as Xerocrassa frater (Dohrn & Heynemann, 1862)
- Species Helix fratercula Pease, 1867 accepted as Libera fratercula (Pease, 1867)
- Species Helix fraterna Say, 1824 accepted as Euchemotrema fraternum fraternum (Say, 1824)
- Species Helix fratisiana Letourneux & Bourguignat, 1887 accepted as Sabessebia zitanica (Letourneux & Bourguignat, 1887)
- Species Helix frauenfeldi Zelebor, 1867 accepted as Videna frauenfeldi (Zelebor, 1867)
- Species Helix frequens Mousson, 1859 accepted as Monacha frequens (Mousson, 1859)
- Species Helix freytagi Maltzan, 1883 accepted as Metafruticicola nicosiana (Mousson, 1854)
- Species Helix friabilis W. G. Binney, 1857 accepted as Mesomphix friabilis (W. G. Binney, 1857)
- Species Helix fricki L. Pfeiffer, 1858 accepted as Endodonta fricki (L. Pfeiffer, 1858)
- Species Helix frickii [sic] accepted as Helix fricki L. Pfeiffer, 1858
- Species Helix friedeliana E. von Martens, 1864 accepted as Aegista friedeliana (E. von Martens, 1864)
- Species Helix friesiana Möllendorff, 1884 accepted as Satsuma friesiana (Möllendorff, 1884)
- Species Helix frigida De Cristofori & Jan, 1832 accepted as Chilostoma frigidum (De Cristofori & Jan, 1832)
- Species Helix frilleyi Crosse & Debeaux, 1863 accepted as Acusta ravida frilleyi (Crosse & Debeaux, 1863)
- Species Helix fringilla L. Pfeiffer, 1855 accepted as Papuina fringilla (L. Pfeiffer, 1855)
- Species Helix fritillata W. H. Benson, 1863
- Species Helix fritschi Mousson, 1872 accepted as Hemicycla fritschi (Mousson, 1872)
- Species Helix frivaldskyana Rossmässler, 1842 accepted as Balcanodiscus frivaldskyanus (Rossmässler, 1842)
- Species Helix frivaldszkyi Calcara, 1846 accepted as Helix philibinensis Rossmässler, 1839
- Species Helix frivola Pease, 1866 accepted as Kusaiea frivola (Pease, 1866)
- Species Helix frizaci Noulet, 1854 † accepted as Parachloraea lapicidites (Boubée, 1831) †
- Species Helix frontonensis Noulet, 1857 † accepted as Parachloraea frontonensis (Noulet, 1857) †
- Species Helix fruticum O. F. Müller, 1774 accepted as Fruticicola fruticum (O. F. Müller, 1774)
- Species Helix fucata L. Pfeiffer, 1853 accepted as Posorites fucata (L. Pfeiffer, 1853)
- Species Helix fuchsi Gredler, 1878 accepted as Bradybaena fuchsi (Gredler, 1878)
- Species Helix fuchsi Halaváts, 1902 † accepted as Vallonia lepida (Reuss, 1849) †
- Species Helix fuchsi De Stefani, 1880 † accepted as Canariella theodori (De Stefani, 1880) †
- Species Helix fuelleborni E. von Martens, 1900 accepted as Halolimnohelix fuelleborni (E. von Martens, 1900)
- Species Helix fulgens G. B. Sowerby I, 1841 accepted as Helicostyla fulgens (G. B. Sowerby I, 1841)
- Species Helix fulgidus J. Adams, 1797 accepted as Eatonina fulgida (J. Adams, 1797)
- Species Helix fulgurata G. B. Sowerby I, 1839 accepted as Ampelita fulgurata (G. B. Sowerby I, 1839)
- Species Helix fulica Röding, 1798 accepted as Achatina fulica Bowdich, 1822
- Species Helix fuliginea L. Pfeiffer, 1841 accepted as Pleurodonte nigrescens (W. Wood, 1828)
- Species Helix fuliginosa A. Binney, 1841 accepted as Mesomphix cupreus (Rafinesque, 1831)
- Species Helix fulva O. F. Müller, 1774 accepted as Euconulus fulvus fulvus (O. F. Müller, 1774)
- Species Helix fulvida L. Pfeiffer, 1842 accepted as Hemiglypta fulvida (L. Pfeiffer, 1842)
- Species Helix fulvoidea Morelet, 1851 accepted as Guppya fulvoidea (Morelet, 1851)
- Species Helix funcki L. Pfeiffer, 1847 accepted as Rectartemon funcki (L. Pfeiffer, 1848)
- Species Helix funebris Morelet, 1877 accepted as Ampelita funebris (Morelet, 1877)
- Species Helix funerea J. C. Cox, 1868 accepted as Elsothera funerea (J. C. Cox, 1868)
- Species Helix funiculata Reeve, 1854 accepted as Hadra funiculata (Reeve, 1854)
- Species Helix furcillata Hupé, 1853 accepted as Labyrinthus furcillatus (Hupé, 1853)
- Species Helix furneauxensis Petterd, 1879 accepted as Laomavix collisi (Brazier, 1877)
- Species Helix furtiva Heude, 1885 accepted as Aegista furtiva (Heude, 1885)
- Species Helix fusca Montagu, 1803 accepted as Acicula fusca (Montagu, 1803)
- Species Helix fuscata Born, 1778 accepted as Neoradina fuscata (Born, 1778)
- Species Helix fuscocincta C. B. Adams, 1849 accepted as Dialeuca conspersula fuscocincta (C. B. Adams, 1849)
- Species Helix fuscolabiata Poey, 1858 accepted as Hemitrochus fuscolabiatus (Poey, 1858)
- Species Helix fuscolabris C. B. Adams, 1850 accepted as Lucerna lucerna (O. F. Müller, 1774)
- Species Helix fuscolutea Grateloup, 1840 accepted as Kalidos fuscoluteus (Grateloup, 1840)
- Species Helix fuscosa Rossmässler, 1838 accepted as Oxychilus (Oxychilus) fuscosus (Rossmässler, 1838)
- Species Helix fuscozonata R. H. Beddome, 1889 accepted as Aaadonta fuscozonata (R. H. Beddome, 1889)
- Species Helix fuscula C. B. Adams, 1849 accepted as Lyroconus fusculus (C. B. Adams, 1849)
- Species Helix fusiformis Rang, 1831 accepted as Moricandia fusiformis (Rang, 1831)
- Species Helix fusoides A. d'Orbigny, 1835 accepted as Drymaeus fusoides (A. d'Orbigny, 1835)
- Species Helix gabata A. Gould, 1843 accepted as Chloritis gabata (A. Gould, 1843)
- Species Helix gabbii Newcomb, 1864 accepted as Micrarionta gabbii (Newcomb, 1864)
- Species Helix gabriellae Dautzenberg & d'Hammonville, 1887 accepted as Camaena gabriellae (Dautzenberg & d'Hammonville, 1887)
- Species Helix gadensis Petterd, 1879 accepted as Gadoropa gadensis (Petterd, 1879)
- Species Helix gagriensis Rosen, 1911 accepted as Oscarboettgeria euages (O. Boettger, 1883)
- Species Helix gaimardi Deshayes, 1831 accepted as Chloritis gaymardi (Deshayes, 1831)
- Species Helix galactites Lamarck, 1822 accepted as Helicostyla mirabilis (A. Férussac, 1821)
- Species Helix galactostoma L. Pfeiffer, 1849 accepted as Ampelita galactostoma (L. Pfeiffer, 1849)
- Species Helix galactostomella Mabille, 1886 accepted as Ampelita calypso (L. Pfeiffer, 1862)
- Species Helix galdarica Mabille, 1883 accepted as Hemicycla psathyra temperata (Mousson, 1872)
- Species Helix galea W. H. Benson, 1859 accepted as Sesara galea (W. H. Benson, 1859)
- Species Helix galera Heude, 1890 accepted as Bradybaena galera (Heude, 1890)
- Species Helix galerus W. H. Benson, 1856 accepted as Sivella galerus (W. H. Benson, 1856)
- Species Helix galinieriana Bourguignat, 1883 accepted as Urguessella galinieriana (Bourguignat, 1883)
- Species Helix gallaeciana Castro, 1887
- Species Helix gallinula L. Pfeiffer, 1844 accepted as Obba gallinula (L. Pfeiffer, 1844)
- Species Helix gallopavonis L. Pfeiffer, 1842 accepted as Hemitrochus gallopavonis (L. Pfeiffer, 1842)
- Species Helix galloprovincialis Matheron, 1843 † accepted as Helix aquensis de Serres, 1829 †
- Species Helix gamma L. Pfeiffer, 1853 accepted as Cavellia buccinella (Reeve, 1852)
- Species Helix ganoda Mabille, 1882 accepted as Canaridiscus ganodus (Mabille, 1882)
- Species Helix ganoma Reeve, 1854 accepted as Cryptozona juliana (Gray, 1834)
- Species Helix gardeneri L. Pfeiffer, 1848 accepted as Euplecta gardeneri (L. Pfeiffer, 1848)
- Species Helix garthii Tate, 1882 accepted as Pillomena meraca (J. C. Cox & Hedley, 1912)
- Species Helix gartneriana Reeve, 1852 accepted as Noctepuna poiretiana (Reeve, 1852)
- Species Helix gaskoini Reeve, 1854 accepted as Caracolus gaskoini (Reeve, 1854)
- Species Helix gaspardiana Paladilhe, 1873 † accepted as Schlickumia gaspardiana (Paladilhe, 1873) †
- Species Helix gassiesi L. Pfeiffer, 1861 accepted as Hebridelos gassiesi (L. Pfeiffer, 1861)
- Species Helix gassiesi Noulet, 1854 †
- Species Helix gaudefroyi Mabille, 1880
- Species Helix gaudens Mabille, 1884 accepted as Ampelita gaudens (Mabille, 1884)
- Species Helix gaudiella Mabille, 1886
- Species Helix gaudryi A. d'Orbigny, 1839 accepted as Hemicycla gaudryi (A. d'Orbigny, 1839)
- Species Helix gaudryopsis Mabille, 1883
- Species Helix gaussoini Tryon, 1866 accepted as Zaphysema gaussoini (Tryon, 1866)
- Species Helix gawleri Brazier, 1872 accepted as Emmalena gawleri (Brazier, 1872)
- Species Helix gaymardi Deshayes, 1831 accepted as Chloritis gaymardi (Deshayes, 1831)
- Species Helix gaymardii Matheron, 1843 † accepted as Cepaea gaymardii (Matheron, 1843) †
- Species Helix gelata J. C. Cox, 1873 accepted as Papuina gelata (J. C. Cox, 1873)
- Species Helix gemina L. Pfeiffer, 1842 accepted as Hemiplecta humphreysiana (I. Lea, 1840)
- Species Helix gemina Philippi, 1842 accepted as Hemiplecta humphreysiana (I. Lea, 1840)
- Species Helix geminata Mousson, 1857 accepted as Theba geminata (Mousson, 1857)
- Species Helix gemma L. Pfeiffer, 1849 accepted as Pseudhelicarion gemma (L. Pfeiffer, 1849)
- Species Helix gemonensis A. Férussac, 1832 accepted as Aegopis gemonensis (A. Férussac, 1832)
- Species Helix generalis L. Pfeiffer, 1855 accepted as Calocochlea generalis (L. Pfeiffer, 1855)
- Species Helix genezarethana Mousson, 1861 accepted as Metafruticicola genezarethana (Mousson, 1861)
- Species Helix geniculata F. Sandberger, 1872 † accepted as Megalotachea sylvestrina (Schlotheim, 1820) †
- Species Helix gentilsiana Crosse, 1870 accepted as Monomphalus gentilsianus (Crosse, 1870)
- Species Helix genulabris E. von Martens, 1861 accepted as Bradybaena similaris (A. Férussac, 1822)
- Species Helix georgiana Quoy & Gaimard, 1832 accepted as Occirhenea georgiana (Quoy & Gaimard, 1832)
- Species Helix gerlachi Möllendorff
- Species Helix germaini R. A. Philippi, 1855
- Species Helix germana A. Gould, 1851 accepted as Cryptomastix germana (A. Gould, 1851)
- Species Helix gerrardi E. A. Smith, 1883 accepted as Sulcobasis rehsei (E. von Martens, 1883)
- Species Helix gerstfeldtii W. Dybowski, 1901 accepted as Chilanodon gerstfeldti (W. Dybowski, 1901)
- Species Helix gervaisii Dubrueil, 1867 accepted as Ryssota gervaisii (Dubrueil, 1867)
- Species Helix geryvillensis Bourguignat, 1862 †
- Species Helix geslini de Boissy, 1848 † accepted as Acanthinula geslini (de Boissy, 1848) †
- Species Helix gestroi Tapparone Canefri, 1883 accepted as Canefriula gestroi (Tapparone Canefri, 1883)
- Species Helix ghiesbreghti Nyst, 1841 accepted as Lysinoe ghiesbreghti (Nyst, 1841)
- Species Helix gibberula Burrow, 1815 accepted as Tomigerus gibberulus (Burrow, 1815)
- Species Helix gibboni L. Pfeiffer, 1846 accepted as Solaropsis gibboni (L. Pfeiffer, 1846)
- Species Helix gibbosula Deshayes, 1850
- Species Helix gibbosula Hombron & Jacquinot, 1847
- Species Helix gibilmanica Servain, 1880 accepted as Xerotricha vatonniana (Bourguignat, 1867)
- Species Helix giengensis Klein, 1846 † accepted as Klikia giengensis (Klein, 1846) †
- Species Helix gigantea Scopoli, 1786 accepted as Hispaniolana gigantea (Scopoli, 1786)
- Species Helix gigas L. Pfeiffer, 1850
- Species Helix gigaxii L. Pfeiffer, 1847 accepted as Backeljaia gigaxii (L. Pfeiffer, 1847)
- Species Helix gilberti L. Pfeiffer, 1846 accepted as Ponderconcha gilberti (L. Pfeiffer, 1846)
- Species Helix gilvus A. Férussac, 1821 accepted as Hemitrochus gilvus (A. Férussac, 1821)
- Species Helix giraudeliana Heude, 1882
- Species Helix girondica Noulet, 1854 † accepted as Palaeotachea moroguesi (Brongniart, 1810) †
- Species Helix girva Frivaldszky, 1835 accepted as Lindholmiola girva (Frivaldsky, 1835)
- Species Helix giuliae Bourguignat, 1876 accepted as Helix cincta O. F. Müller, 1774
- Species Helix gjalskii Brusina, 1902 †
- Species Helix glabella Draparnaud, 1801 accepted as Urticicola glabellus (Draparnaud, 1801)
- Species Helix glaberrima Benoit, 1859 accepted as Morlina glabra ercica (Benoit, 1859)
- Species Helix glaberrima Reeve, 1854
- Species Helix glabra Rossmässler, 1835 accepted as Morlina glabra (Rossmässler, 1835)
- Species Helix glabrata Megerle von Mühlfeld, 1824 accepted as Pisinna glabrata (Megerle von Mühlfeld, 1824)
- Species Helix glabriuscula L. Pfeiffer, 1853 accepted as Phrixgnathus glabriusculus (Reeve, 1852)
- Species Helix glabriuscula Reeve, 1852 accepted as Phrixgnathus glabriusculus (Reeve, 1852)
- Species Helix glandula H. Beck, 1838 accepted as Hiona glandula (H. Beck, 1838)
- Species Helix glanvilliana Ancey, 1890 accepted as Trachycystis glanvilliana (Ancey, 1890)
- Species Helix glaphyra Say, 1817 accepted as Oxychilus cellarius (O. F. Müller, 1774)
- Species Helix glasiana Shuttleworth, 1852 accepted as Hemicycla glasiana (Shuttleworth, 1852)
- Species Helix glauca Linnaeus, 1758 accepted as Pomacea glauca (Linnaeus, 1758)
- Species Helix glauca L. Pfeiffer, 1846 accepted as Tanychlamys glauca (L. Pfeiffer, 1846)
- Species Helix glischra Letourneux & Bourguignat, 1887 accepted as Schileykiella sordulenta (Morelet, 1851)
- Species Helix globosus J. Sowerby, 1817 † accepted as Megalocochlea pseudoglobosa (A. d'Orbigny, 1850) †
- Species Helix globula Kaleniczenko, 1853 accepted as Stenomphalia selecta (Klika, 1894)
- Species Helix globula Krynicki, 1838
- Species Helix globula I. Lea, 1834
- Species Helix globularis R. A. Philippi, 1836 accepted as Marmorana globularis (R. A. Philippi, 1836)
- Species Helix globuloidea Terver, 1839
- Species Helix globulosa Zieten, 1832 † accepted as Palaeotachea subsulcosa (Thomä, 1845) †
- Species Helix globulus O. F. Müller, 1774 accepted as Trigonephrus globulus (O. F. Müller, 1774)
- Species Helix glockeri Quenstedt, 1884 † accepted as Viviparus glockeri (Quenstedt, 1884) †
- Species Helix glomerosa Godwin-Austen, 1883
- Species Helix gloriosa L. Pfeiffer, 1856 accepted as Helicophanta gloriosa (L. Pfeiffer, 1856)
- Species Helix glutinosa Metcalfe, 1852 accepted as Vitrinula glutinosa (Metcalfe, 1852)
- Species Helix glyceia Mabille, 1882 accepted as Hemicycla glyceia (Mabille, 1882)
- Species Helix gmeliniana L. Pfeiffer, 1845 accepted as Chloraea gmeliniana (L. Pfeiffer, 1845)
- Species Helix godarti Michaud, 1855 † accepted as Prosoosia godarti (Michaud, 1855) †
- Species Helix goderdziana Mumladze, Tarkhnishvili & Pokryszko, 2008 accepted as Helix buchii Dubois de Montpéreux, 1840
- Species Helix godetiana Kobelt, 1878
- Species Helix goldfussii Thomä, 1845 † accepted as Omphalosagda goldfussii (Thomä, 1845) †
- Species Helix gomerae Wollaston, 1878 accepted as Canariella gomerae (Wollaston, 1878)
- Species Helix gomerensis Morelet, 1864 accepted as Hemicycla gomerensis (Morelet, 1864)
- Species Helix gomesiana Paiva, 1866 accepted as Discula calcigena gomesiana (Paiva, 1866)
- Species Helix goniochila L. Pfeiffer, 1862 accepted as Landouria ptychostyla (E. von Martens, 1860)
- Species Helix goniomphala Reeve, 1854 accepted as Trochomorpha kuesteri (L. Pfeiffer, 1845)
- Species Helix gonzalezi Azpeitia, 1925 accepted as Xerotricha gonzalezi (Azpeitia, 1925)
- Species Helix goodallii J. S. Miller, 1822 accepted as Opeas hannense (Rang, 1831)
- Species Helix goodwinii E. A. Smith, 1876 accepted as Trishoplita goodwinii (E. A. Smith, 1876)
- Species Helix gordoniae W. H. Benson, 1863 accepted as Hemiplecta gordoniae (W. H. Benson, 1863)
- Species Helix gossei L. Pfeiffer, 1846 accepted as Dialeuca subconica (C. B. Adams, 1845)
- Species Helix gothica Linnaeus, 1758
- Species Helix goudotiana L. Pfeiffer, 1845 accepted as Embertoniphanta oviformis (Grateloup, 1840)
- Species Helix gougeti Terver, 1839
- Species Helix goulardiana Crosse, 1870 accepted as Platyrhytida goulardiana (Crosse, 1870)
- Species Helix gouldi L. Pfeiffer, 1846 accepted as Ganesella gouldi (L. Pfeiffer, 1846)
- Species Helix grabhami Wollaston, 1878 accepted as Geomitra grabhami (Wollaston, 1878)
- Species Helix gracilis Poey, 1865 accepted as Hojeda gracilis (Poey, 1865)
- Species Helix gracilis Quoy & Gaimard, 1825 accepted as Laminella sanguinea (Newcomb, 1854)
- Species Helix gradata A. Gould, 1846 accepted as Ouagapia gradata (A. Gould, 1846)
- Species Helix gradata L. Pfeiffer, 1847 accepted as Coneuplecta scalarina (L. Pfeiffer, 1852)
- Species Helix gradiscanensis Fagot, 1884
- Species Helix graellsiana L. Pfeiffer, 1848 accepted as Allognathus graellsianus (L. Pfeiffer, 1848)
- Species Helix graftonensis J. C. Cox, 1864 accepted as Helix subrugata Reeve, 1852
- Species Helix graminicola C. B. Adams, 1849 accepted as Hemitrochus graminicola (C. B. Adams, 1849)
- Species Helix graminum Heude, 1882
- Species Helix granatelli Bivona, 1839 accepted as Acanthinula aculeata (O. F. Müller, 1774)
- Species Helix grandidieri Crosse & P. Fischer, 1875 accepted as Helicophanta goudotiana (L. Pfeiffer, 1845)
- Species Helix grandis L. Pfeiffer, 1845 accepted as Helicobulinus grandis (L. Pfeiffer, 1845)
- Species Helix granifera J. E. Gray, 1834 accepted as Dentellaria perplexa (A. Férussac, 1832)
- Species Helix grannonensis Bourguignat in Servain, 1880 accepted as Cernuella virgata (Da Costa, 1778)
- Species Helix granomalleata Wollaston, 1878 accepted as Hemicycla granomalleata (Wollaston, 1878)
- Species Helix granosa W. Wood, 1828 accepted as Thelidomus aspera (A. Férussac, 1821)
- Species Helix granostriata Mousson, 1857 accepted as Monilearia granostriata (Mousson, 1857)
- Species Helix granti L. Pfeiffer, 1866 accepted as Aegista granti (L. Pfeiffer, 1865)
- Species Helix granulata Quoy & Gaimard, 1832 accepted as Albersia granulata (Quoy & Gaimard, 1832)
- Species Helix granulata J. R. Roth, 1839 accepted as Metafruticicola berytensis (L. Pfeiffer, 1841)
- Species Helix granulata Alder, 1830 accepted as Ashfordia granulata (Alder, 1830)
- Species Helix granulifera Möllendorff, 1888 accepted as Euhadra granulifera (Möllendorff, 1888)
- Species Helix granulosa Deshayes, 1850 accepted as Ampelita granulosa (Deshayes, 1850)
- Species Helix granum L. Pfeiffer, 1857 accepted as Granallodiscus granum (L. Pfeiffer, 1857)
- Species Helix granum (Strebel & Pfeffer, 1879) accepted as Thysanophora granum (Strebel & Pfeffer, 1879)
- Species Helix graphicotera Bourguignat, 1856 accepted as Metafruticicola noverca (L. Pfeiffer, 1853)
- Species Helix grasseti Mousson, 1872 accepted as Theba grasseti (Mousson, 1872)
- Species Helix gratianopolitana Rambur, 1869 accepted as Fruticicola hispida (Linnaeus, 1758)
- Species Helix gratiosa J. C. Cox, 1871 accepted as Bentosites gavisa Iredale, 1933
- Species Helix gravida Quoy & Gaimard, 1825 accepted as Laminella gravida (Quoy & Gaimard, 1825)
- Species Helix gravida Mousson, 1872 accepted as Helix sarcostoma P. B. Webb & S. Berthelot, 1833
- Species Helix grayana L. Pfeiffer, 1842 accepted as Helix marginata O. F. Müller, 1774
- Species Helix grayi L. Pfeiffer, 1847 accepted as Sauroconcha grayi (L. Pfeiffer, 1847)
- Species Helix greenhilli J. C. Cox, 1866 accepted as Pallidelix greenhilli (J. C. Cox, 1866)
- Species Helix greenwoodi J. E. Gray, 1850 accepted as Rhytida greenwoodi (J. E. Gray, 1850)
- Species Helix gregaria Rossmässler, 1839 accepted as Monacha gregaria (Rossmässler, 1839)
- Species Helix grelloisii Bourguignat, 1857 accepted as Metafruticicola redtenbacheri (L. Pfeiffer, 1856)
- Species Helix grenvillei Brazier, 1876 accepted as Thysanota grenvillei (Brazier, 1876)
- Species Helix grevillei L. Pfeiffer, 1857 accepted as Acavus grevillei (L. Pfeiffer, 1857)
- Species Helix grevillei L. Pfeiffer, 1856 accepted as Acavus superbus (L. Pfeiffer, 1850)
- Species Helix griffithi L. Pfeiffer, 1846
- Species Helix grisea Linnaeus, 1758 accepted as Helix lucorum Linnaeus, 1758
- Species Helix griseola L. Pfeiffer, 1841 accepted as Praticolella griseola (L. Pfeiffer, 1841)
- Species Helix grossularia L. Pfeiffer, 1861
- Species Helix gruneri L. Pfeiffer, 1845 accepted as Chloritis gruneri (L. Pfeiffer, 1845)
- Species Helix guadalcanarensis J. C. Cox, 1872 accepted as Papuina guadalcanarensis (J. C. Cox, 1872)
- Species Helix gualinoi Michaud, 1855 † accepted as Megalotachea gualinoi (Michaud, 1855) †
- Species Helix gualtierana Linnaeus, 1758 accepted as Iberus gualtieranus (Linnaeus, 1758)
- Species Helix guamartemes Grasset, 1857 accepted as Hemicycla guamartemes (Grasset, 1857)
- Species Helix guanensis Poey, 1858 accepted as Zachrysia guanensis (Poey, 1858)
- Species Helix guantanamensis Poey, 1858 accepted as Zachrysia guantanamensis (Poey, 1858)
- Species Helix guarani A. d'Orbigny, 1835 accepted as Bahiensis guarani (A. d'Orbigny, 1835)
- Species Helix guatemalensis Crosse & P. Fischer, 1872 accepted as Lyroconus caecoides (Tate, 1870)
- Species Helix guayaquilensis Reeve, 1852 accepted as Scolodonta guayaquilensis (Reeve, 1852)
- Species Helix gueinzii L. Pfeiffer, 1857 accepted as Epiphragmophora gueinzii (L. Pfeiffer, 1857)
- Species Helix guerini L. Pfeiffer, 1842 accepted as Thysanota guerini (L. Pfeiffer, 1842)
- Species Helix guerini Anton, 1838
- Species Helix gueriniana R. T. Lowe, 1852 accepted as Atlantica gueriniana (R. T. Lowe, 1852)
- Species Helix guestieriana Crosse, 1868 accepted as Helicophanta guestieriana (Crosse, 1868)
- Species Helix guillaini Petit de la Saussaye, 1850 accepted as Ampelita lancula (A. Férussac, 1821)
- Species Helix guillarmodi Shuttleworth, 1852 accepted as Leptarionta guillarmodi (Shuttleworth, 1852)
- Species Helix guimeti Bourguignat, 1876 accepted as Xeropicta guimeti (Bourguignat, 1876)
- Species Helix guinaria L. Pfeiffer, 1861
- Species Helix guiraoana L. Pfeiffer, 1853 accepted as Iberus guiraoanus (L. Pfeiffer, 1853)
- Species Helix gularis Say, 1821 accepted as Ventridens gularis (Say, 1821)
- Species Helix gulosa A. Gould, 1846 accepted as Sauroconcha gulosa (A. Gould, 1846)
- Species Helix gummata G. B. Sowerby I, 1841 accepted as Hemitrichia (Atrichoconcha) gummata (G. B. Sowerby I, 1841)
- Species Helix gundlachii L. Pfeiffer, 1840 accepted as Guppya gundlachii (L. Pfeiffer, 1840)
- Species Helix gunnii L. Pfeiffer, 1850 accepted as Rhytida greenwoodi (J. E. Gray, 1850)
- Species Helix gussoneana L. Pfeiffer, 1848
- Species Helix gutierrezi Poey, 1854 accepted as Caracolus marginella (Gmelin, 1791)
- Species Helix guttata Le Guillou, 1842 accepted as Planispira zebra (L. Pfeiffer, 1850)
- Species Helix guttata Olivier, 1804 accepted as Levantina spiriplana (Olivier, 1801)
- Species Helix guttula L. Pfeiffer, 1853 accepted as Lamprocystis guttula (L. Pfeiffer, 1853)
- Species Helix gypsacea L. Pfeiffer, 1850 accepted as Asperitas trochus (O. F. Müller, 1774)
- Species Helix gyrella Morelet, 1863 accepted as Happia gyrella (Morelet, 1863)
- Species Helix gyria J. R. Roth, 1839 accepted as Lindholmiola gyria (J. R. Roth, 1839)
- Species Helix gyrina Gassies, 1859 accepted as Andrefrancia dispersa (Gassies, 1863)
- Species Helix gyrina Deshayes, 1850 accepted as Oxychona gyrina (Deshayes, 1850)
- Species Helix gyrioxia Bourguignat, 1862 † accepted as Ciliella gyrioxia (Bourguignat, 1862) †
- Species Helix gyroides L. Pfeiffer, 1871 accepted as Xeropicta derbentina (Krynicki, 1836)
- Species Helix gyroplatys Dohrn, 1882
- Species Helix gyrorbis Klein, 1846 † accepted as Janulus gyrorbis (Klein, 1846) †
- Species Helix gyrostoma A. Férussac, 1821 accepted as Gyrostomella (Gyrostomella) gyrostoma (A. Férussac, 1821)
- Species Helix gysseriana L. Pfeiffer, 1865
- Species Helix haberhaueri Sturany, 1897 accepted as Cattania haberhaueri (Sturany, 1897)
- Species Helix haemastoma Linnaeus, 1758 accepted as Acavus haemastoma (Linnaeus, 1758)
- Species Helix haematozona Heude, 1882 accepted as Camaena haematozona (Heude, 1882)
- Species Helix haematragus Born, 1778 accepted as Acavus haemastoma (Linnaeus, 1758)
- Species Helix haesendonckii Nyst, 1845 † accepted as Cepaea haesendonckii (Nyst, 1845) †
- Species Helix haesitans Heude, 1888
- Species Helix hahni Mabille, 1887 accepted as Camaena hahni (Mabille, 1887)
- Species Helix haidingeri Reuss, 1849 † accepted as Miozonites algiroides (Reuss, 1849) †
- Species Helix hainesi L. Pfeiffer, 1856 accepted as Sarika hainesi (L. Pfeiffer, 1856)
- Species Helix haitensis Weinland & E. von Martens, 1859 accepted as Helix monodonta I. Lea, 1834
- Species Helix halata (Mousson, 1849) accepted as Asperitas trochus (O. F. Müller, 1774)
- Species Helix haldemaniana L. Pfeiffer, 1845 accepted as Hyalosagda arboreoides (C. B. Adams, 1845)
- Species Helix haliotoidea Linnaeus, 1758 accepted as Sinum haliotoideum (Linnaeus, 1758)
- Species Helix halli Legrand, 1871 accepted as Gratilaoma halli (Legrand, 1871)
- Species Helix halmyris Mabille, 1869 accepted as Marmorana serpentina (A. Férussac, 1821)
- Species Helix hamacenica Bourguignat, 1883 accepted as Helicella hamacenica (Bourguignat, 1883)
- Species Helix hamilcaris Kobelt, 1877 accepted as Cernuella virgata (Da Costa, 1778)
- Species Helix hamiltoni J. C. Cox, 1868 accepted as Stenacapha hamiltoni (J. C. Cox, 1868)
- Species Helix hammonis Strøm, 1765 accepted as Perpolita hammonis (Strøm, 1765)
- Species Helix hamudae Kobelt, 1886
- Species Helix hamyi Westerlund, 1888 accepted as Xeropicta krynickii (Krynicki, 1833)
- Species Helix hanleyi L. Pfeiffer, 1845 accepted as Chloraea hanleyi (L. Pfeiffer, 1845)
- Species Helix hannensis Rang, 1831 accepted as Opeas hannense (Rang, 1831)
- Species Helix hanni Brazier, 1876 accepted as Steorra mourilyani (Brazier, 1875)
- Species Helix hapa Hombron & Jacquinot, 1847 accepted as Mendana rectangula (L. Pfeiffer, 1846)
- Species Helix hardouini de Morgan, 1885 accepted as Trachia hardouini (de Morgan, 1885)
- Species Helix harfordiana (J. G. Cooper, 1870) accepted as Polygyroidea harfordiana (J. G. Cooper, 1870)
- Species Helix harfordii Broderip, 1841 accepted as Calocochlea harfordii (Broderip, 1841)
- Species Helix hariola W. H. Benson, 1856 accepted as Ganesella hariola (W. H. Benson, 1856)
- Species Helix harmonica Mousson, 1872 accepted as Hemicycla maugeana (Shuttleworth, 1852)
- Species Helix harpa Say, 1824 accepted as Zoogenetes harpa (Say, 1824)
- Species Helix harriettae J. C. Cox, 1868 accepted as Austrorhytida harriettae (J. C. Cox, 1868)
- Species Helix hartmanni L. Pfeiffer, 1846 accepted as Trochomorpha hartmanni (L. Pfeiffer, 1846)
- Species Helix hartungi Albers, 1852 accepted as Caseolus hartungi (Albers, 1852)
- Species Helix hartvigiana L. Pfeiffer, 1861 accepted as Phortion hartvigianum (L. Pfeiffer, 1861)
- Species Helix hartwegi L. Pfeiffer, 1846 accepted as Isomeria hartwegi (L. Pfeiffer, 1846)
- Species Helix haruspica Dall, 1890 † accepted as Pleurodontites haruspica (Dall, 1890) †
- Species Helix hauffeni F. J. Schmidt, 1855 accepted as Spelaeodiscus hauffeni (F. J. Schmidt, 1855)
- Species Helix haughtoni W. H. Benson, 1863 accepted as Rhyssotopsis conferta (L. Pfeiffer, 1857)
- Species Helix haveri Michelotti, 1847 † accepted as Tropidomphalus (Pseudochloritis) haveri (Michelotti, 1847) †
- Species Helix haydeni Gabb, 1869 accepted as Oreohelix haydeni (Gabb, 1869)
- Species Helix hayii J. E. Gray, 1833 accepted as Pedinogyra hayii (J. E. Gray, 1833)
- Species Helix hazardi Bland, 1858 accepted as Daedalochila plicata (Say, 1821)
- Species Helix headonensis F. E. Edwards, 1852 † accepted as Strobilops headonensis (F. E. Edwards, 1852) †
- Species Helix hebe Deshayes, 1850 accepted as Coryda alauda (A. Férussac, 1821)
- Species Helix heberti Deshayes, 1863 † accepted as Ochthephila (Caseolus) heberti (Deshayes, 1863) †
- Species Helix heckeliana Crosse, 1872 accepted as Monomphalus rossiterianus (Crosse, 1871)
- Species Helix hector L. Pfeiffer, 1861 accepted as Helix polillensis L. Pfeiffer, 1861
- Species Helix hectori Suter, 1890 accepted as Huonodon hectori (Suter, 1890)
- Species Helix hedeia Mabille, 1882 † accepted as Hemicycla hedeia (Mabille, 1883) †
- Species Helix hedenborgi L. Pfeiffer, 1846 accepted as Monacha nummus (Ehrenberg, 1831)
- Species Helix hedleyi E. A. Smith, 1892 accepted as Papuina hedleyi (E. A. Smith, 1892)
- Species Helix hedonica Mabille, 1882 accepted as Hemicycla bidentalis (Lamarck, 1822)
- Species Helix hedybia Mabille, 1882 accepted as Hemicycla hedybia (Mabille, 1882)
- Species Helix heldiana L. Pfeiffer, 1853 accepted as Phrixgnathus erigone (J. E. Gray, 1850)
- Species Helix heldreichi L. Pfeiffer, 1846 accepted as Thiessea heldreichi (L. Pfeiffer, 1846)
- Species Helix helena Quoy & Gaimard, 1832 accepted as Chilonopsis helena (Quoy & Gaimard, 1832)
- Species Helix helenensis Forbes, 1852 accepted as Helenoconcha polyodon (G. B. Sowerby I, 1844)
- Species Helix helferi W. H. Benson, 1860 accepted as Chloritis helferi (W. H. Benson, 1860)
- Species Helix heliaca A. d'Orbigny, 1835 accepted as Solaropsis heliaca (A. d'Orbigny, 1835)
- Species Helix helicarion Voigt, 1834 accepted as Stanisicarion freycineti (A. Férussac, 1821)
- Species Helix helice Legrand, 1871 accepted as Mulathena fordei (Brazier, 1871)
- Species Helix helicella W. Wood, 1828 accepted as Theba subdentata helicella (W. Wood, 1828)
- Species Helix helicinoides Mousson, 1849 accepted as Chloritis helicinoides (Mousson, 1849)
- Species Helix helicinoides Hombron & Jacquinot, 1847 accepted as Dendrotrochus helicinoides (Hombron & Jacquinot, 1847)
- Species Helix helicophantoides L. Pfeiffer, 1846
- Species Helix helictomphala L. Pfeiffer, 1856 accepted as Polygyra yucatanea (Morelet, 1849)
- Species Helix helicycloides A. d'Orbigny, 1835 accepted as Systrophia helicycloides (A. d'Orbigny, 1835)
- Species Helix heligmoida A. d'Orbigny, 1835 accepted as Systrophia heligmoida (A. d'Orbigny, 1835)
- Species Helix helmii G. B. Sowerby I, 1838
- Species Helix heloica A. d'Orbigny, 1835
- Species Helix helva J. C. Cox, 1870 accepted as Reticharopa helva (J. C. Cox, 1870)
- Species Helix helvacea R. A. Philippi, 1845 accepted as Acusta ravida (W. H. Benson, 1842)
- Species Helix helvola L. Pfeiffer, 1853 accepted as Fruticicola helvola (L. Pfeiffer, 1853)
- Species Helix helygaia Mabille, 1882 accepted as Hemicycla bidentalis (Lamarck, 1822)
- Species Helix hemiopta W. H. Benson, 1863 accepted as Chloritis hemiopta (W. H. Benson, 1863)
- Species Helix hemipleuris Möllendorff, 1885 accepted as Metodontia houaiensis hemipleuris (Möllendorff, 1885)
- Species Helix hemipsorica Morelet, 1852 accepted as Pseudopolita hemipsorica (Morelet, 1852)
- Species Helix hemisphaerica Michaud, 1837 † accepted as Grandipatula hemisphaerica (Michaud, 1837) †
- Species Helix hemisphaerion L. Pfeiffer, 1851 accepted as Calocochlea hemisphaerion (L. Pfeiffer, 1851)
- Species Helix hemonica Thiesse, 1884 accepted as Josephinella hemonica (Thiesse, 1884)
- Species Helix hemphillii Newcomb, 1869 accepted as Oreohelix hemphillii (Newcomb, 1869)
- Species Helix hemprichii Ehrenberg, 1831 accepted as Eremina desertorum (Forsskål, 1775)
- Species Helix henrici Tournouër, 1882 †
- Species Helix henriquesi Castro, 1887
- Species Helix henryana Petterd, 1879 accepted as Laomavix collisi (Brazier, 1877)
- Species Helix henschei L. Pfeiffer, 1867 accepted as Trochomorpha henschei (L. Pfeiffer, 1867)
- Species Helix hepatica Reeve, 1851 accepted as Lamarckiella hepatica (Reeve, 1851)
- Species Helix hepatizon A. Gould, 1845 accepted as Rhysotina hepatizon (A. Gould, 1845)
- Species Helix herbicola Mousson, 1872 accepted as Cernuella virgata (Da Costa, 1778)
- Species Helix herbini Bourguignat, 1883 accepted as Urguessella herbini (Bourguignat, 1883)
- Species Helix herklotsi E. von Martens, 1861 accepted as Euhadra herklotsi (E. von Martens, 1861)
- Species Helix hermanni L. Pfeiffer, 1866 accepted as Rotadiscus hermanni (L. Pfeiffer, 1866)
- Species Helix hermione Angas, 1870 accepted as Papuina hermione (Angas, 1870)
- Species Helix heroica L. Pfeiffer, 1855 accepted as Obba papilla (O. F. Müller, 1774)
- Species Helix herpestes Heude, 1885
- Species Helix herza Mabille, 1889
- Species Helix herziana Möllendorff, 1888 accepted as Trichochloritis herziana (Möllendorff, 1888)
- Species Helix hesperarche T. D. A. Cockerell, 1914 † accepted as Hodopoeus hesperarche (T. D. A. Cockerell, 1914) †
- Species Helix hesperidum Morelet, 1880 accepted as Trochoidea hesperidum (Morelet, 1880)
- Species Helix hetaera L. Pfeiffer, 1860 accepted as Zyghelix forsteriana (Reeve, 1852)
- Species Helix heteroclites Lamarck, 1822 accepted as Lucerna lucerna (O. F. Müller, 1774)
- Species Helix hettneriana E. von Martens, 1897 accepted as Epiphragmophora claromphalos (Deville & Hupé, 1850)
- Species Helix heynemanni L. Pfeiffer, 1862 accepted as Libera heynemanni (L. Pfeiffer, 1862)
- Species Helix hians L. Pfeiffer, 1846
- Species Helix hiberna Benoit, 1859
- Species Helix hidalgoiana Crosse, 1864 accepted as Trochomorpha hidalgoiana (Crosse, 1864)
- Species Helix hidalgonis Doering, 1877 accepted as Epiphragmophora trenquelleonis (L. Pfeiffer, 1850)
- Species Helix hierapetrana Maltzan, 1887 accepted as Pseudoxerophila bathytera (Blanc, 1879)
- Species Helix hiericontina Westerlund, 1888
- Species Helix hieroglyphicula Michaud, 1833 accepted as Otala hieroglyphicula (Michaud, 1833)
- Species Helix hierophanta Mabille, 1882 accepted as Theba geminata (Mousson, 1857)
- Species Helix hierosolyma Mousson, 1854 accepted as Levantina lithophaga (Conrad, 1852)
- Species Helix hierosolymitana Bourguignat, 1852 accepted as Pyramidula rupestris (Draparnaud, 1801)
- Species Helix hierroensis Grasset, 1857 accepted as Hemicycla maugeana (Shuttleworth, 1852)
- Species Helix hildagoiana Crosse, 1864 accepted as Trochomorpha zenobia (L. Pfeiffer, 1864)
- Species Helix hilgendorfi Kobelt, 1879 accepted as Trishoplita hilgendorfi (Kobelt, 1879)
- Species Helix hillebrandi Newcomb, 1864 accepted as Monadenia mormonum hillebrandi (Newcomb, 1864)
- Species Helix hillei L. Pfeiffer, 1871 accepted as Odontosagda hillei (L. Pfeiffer, 1871)
- Species Helix hilli Brazier, 1875 accepted as Steorra mourilyani (Brazier, 1875)
- Species Helix hillyeriana Paulucci, 1882 accepted as Xerosecta dohrni (Paulucci, 1882)
- Species Helix himalana I. Lea, 1834 accepted as Ariophanta himalana (I. Lea, 1834)
- Species Helix himalayana I. Lea, 1834 accepted as Helix himalana I. Lea, 1834
- Species Helix hindsi L. Pfeiffer, 1846 accepted as Linisa hindsi (L. Pfeiffer, 1846)
- Species Helix hipparionum Ping, 1929 † accepted as Vallonia hipparionum (Ping, 1929) †
- Species Helix hippocrepis L. Pfeiffer, 1848 accepted as Daedalochila hippocrepis (L. Pfeiffer, 1848)
- Species Helix hipponensis Morelet, 1858 accepted as Trochoidea hipponensis (Morelet, 1858)
- Species Helix hirsuta Say, 1817 accepted as Stenotrema hirsutum (Say, 1817)
- Species Helix hirta Menke, 1828 accepted as Campylaea hirta (Menke, 1828)
- Species Helix hispalina Servain, 1880 accepted as Backeljaia gigaxii (L. Pfeiffer, 1847)
- Species Helix hispana Linnaeus, 1758
- Species Helix hispanica Rossmässler, 1838 accepted as Allognathus balearicus (Rossmässler, 1838)
- Species Helix hispida Linnaeus, 1758 accepted as Trochulus hispidus (Linnaeus, 1758)
- Species Helix hispidellina Locard, 1894 † accepted as Trochulus hispidus (Linnaeus, 1758)
- Species Helix hitachi Ijima, 1891 accepted as Euhadra brandtii brandtii (Kobelt, 1875)
- Species Helix hixsoni Brazier, 1877 accepted as Canefriula hixsoni (Brazier, 1877)
- Species Helix hjalmarsoni L. Pfeiffer, 1858 accepted as Cysticopsis hjalmarsoni (L. Pfeiffer, 1858)
- Species Helix hobarti J. C. Cox, 1868 accepted as Paralaoma hobarti (Cox, 1868)
- Species Helix hochheimensis O. Boettger, 1897 † accepted as Omphalosagda hochheimensis (O. Boettger, 1897) †
- Species Helix hochstetteri L. Pfeiffer, 1861 accepted as Powelliphanta hochstetteri (L. Pfeiffer, 1861)
- Species Helix hodgsoni W. H. Benson, 1859 accepted as Tanychlamys hodgsoni (W. H. Benson, 1859)
- Species Helix hoffmanni Rossmässler, 1836 accepted as Liburnica hoffmanni (Rossmässler, 1836)
- Species Helix hogoleuensis Le Guillou, 1845 accepted as Trukrhysa pachystoma (Hombron & Jacquinot, 1841)
- Species Helix hollandi C. B. Adams, 1849 accepted as Hyalosagda hollandi (C. B. Adams, 1849)
- Species Helix hololoma Möllendorff, 1887 accepted as Aulacospira hololoma (Möllendorff, 1887)
- Species Helix holotricha O. Boettger, 1884 accepted as Dioscuria holotricha (O. Boettger, 1884)
- Species Helix homalospira Morelet, 1883 accepted as Psichion homalospira (Morelet, 1883)
- Species Helix hombresi Fontannes, 1884 † accepted as Parachloraea hombresi (Fontannes, 1884) †
- Species Helix hombroni L. Pfeiffer, 1857 accepted as Chloritis quercina hombroni (L. Pfeiffer, 1857)
- Species Helix homeyeri Dohrn & Heynemann, 1862 accepted as Xerocrassa homeyeri (Dohrn & Heynemann, 1862)
- Species Helix hondana Reeve, 1854
- Species Helix honesta A. Gould, 1846 accepted as Sakiella honesta (A. Gould, 1846)
- Species Helix hongkongensis Deshayes, 1874 accepted as Bradybaena similaris hongkongensis (Deshayes, 1874)
- Species Helix hookeri Reeve, 1854 accepted as Notodiscus hookeri (Reeve, 1854)
- Species Helix hookeriana Petterd, 1879 accepted as Groveiana hookeriana (Petterd, 1879)
- Species Helix hopetonensis Shuttleworth, 1852 accepted as Triodopsis hopetonensis (Shuttleworth, 1852)
- Species Helix horderi G. B. Sowerby III, 1890 accepted as Papustyla horderi (G. B. Sowerby III, 1890)
- Species Helix horiomphala L. Pfeiffer, 1854 accepted as Videnoida horiomphala (L. Pfeiffer, 1854)
- Species Helix horizontalis L. Pfeiffer, 1845 accepted as Obba horizontalis (L. Pfeiffer, 1845)
- Species Helix hornii Gabb, 1866 accepted as Setidiscus hornii (Gabb, 1866)
- Species Helix horrida L. Pfeiffer, 1863 accepted as Trichelix horrida (L. Pfeiffer, 1863)
- Species Helix horripila Morelet & Drouët, 1857 accepted as Moreletina horripila (Morelet & Drouët, 1857)
- Species Helix horripilosella Heude, 1885
- Species Helix hortensis O. F. Müller, 1774 accepted as Cepaea hortensis (O. F. Müller, 1774)
- Species Helix hortulana Thomä, 1845 † accepted as Palaeotachea hortulana (Thomä, 1845) †
- Species Helix hospitans Rossmässler, 1836 accepted as Marmorana serpentina hospitans (Rossmässler, 1836)
- Species Helix hottentota Melvill & Ponsonby, 1891 accepted as Paralaoma hottentota (Melvill & Ponsonby, 1891)
- Species Helix houaiensis Crosse, 1882 accepted as Metodontia huaiensis (Crosse, 1882)
- Species Helix hova Angas, 1877 accepted as Ampelita hova (Angas, 1877)
- Species Helix howeinsulae J. C. Cox, 1873 accepted as Epiglypta howeinsulae (J. C. Cox, 1873)
- Species Helix huaheinensis L. Pfeiffer, 1853 accepted as Nesodiscus huaheinensis (L. Pfeiffer, 1853)
- Species Helix huanucensis R. A. Philippi, 1867 accepted as Epiphragmophora huanucensis (R. A. Philippi, 1867)
- Species Helix hubbardi A. D. Brown, 1861 accepted as Discostrobilops hubbardi (A. D. Brown, 1861)
- Species Helix huberiana Heude, 1882 accepted as Acusta redfieldi (Reeve, 1852)
- Species Helix hudsoniae W. H. Benson, 1864 accepted as Sheldonia hudsoniae (W. H. Benson, 1864)
- Species Helix hueensis Wattebled, 1886 accepted as Pupisoma hueense (Wattebled, 1886)
- Species Helix huegeli L. Pfeiffer, 1846 accepted as Chloraea bifasciata huegeli (L. Pfeiffer, 1846)
- Species Helix huetiana Benoit, 1857
- Species Helix hugonis L. Pfeiffer, 1864 accepted as Dyakia hugonis (L. Pfeiffer, 1864)
- Species Helix humberti Brot, 1864 accepted as Corilla humberti (Brot, 1864)
- Species Helix humboldtiana L. Pfeiffer, 1841 accepted as Humboldtiana humboldtiana (L. Pfeiffer, 1841)
- Species Helix humilis W. H. Benson, 1838 accepted as Pyramidula humilis (W. H. Benson, 1838)
- Species Helix humphreysiana I. Lea, 1840 accepted as Hemiplecta humphreysiana (I. Lea, 1840)
- Species Helix hungerfordiana Möllendorff, 1884 accepted as Yakuchloritis hungerfordianus (Möllendorff, 1884)
- Species Helix hunteri J. C. Cox, 1872 accepted as Crystallopsis hunteri (J. C. Cox, 1872)
- Species Helix hupeana Gredler, 1886 accepted as Aegista hupeana (Gredler, 1886)
- Species Helix hupensis Gredler, 1887 accepted as Plectotropis hupensis (Gredler, 1885)
- Species Helix huttonii L. Pfeiffer, 1842 accepted as Landouria huttonii (L. Pfeiffer, 1842)
- Species Helix hyalina Le Guillou, 1842
- Species Helix hyba W. H. Benson, 1861 accepted as Khasiella hyba (W. H. Benson, 1861)
- Species Helix hydatina Rossmässler, 1838 accepted as Mediterranea hydatina (Rossmässler, 1838)
- Species Helix hydrophana G. B. Sowerby I, 1841 accepted as Orthostylus metaformis (A. Férussac, 1821)
- Species Helix hydrophyla Miles, 1861 accepted as Zonitoides nitidus (O. F. Müller, 1774)
- Species Helix hydruntina Kobelt, 1883 accepted as Cernuella hydruntina (Kobelt, 1883)
- Species Helix hygrohylaea A. d'Orbigny, 1835 accepted as Drymaeus hygrohylaeus (A. d'Orbigny, 1835)
- Species Helix hylephila A. d'Orbigny, 1835 accepted as Streptaxis hylephilus (A. d'Orbigny, 1835)
- Species Helix hylonomia Bourguignat, 1882
- Species Helix hymetti Mousson, 1854 accepted as Thiessea hymetti (Mousson, 1854)
- Species Helix hypaeana Bourguignat in Locard, 1882 accepted as Xerotricha apicina (Lamarck, 1822)
- Species Helix hyperbolica F. Sandberger, 1870 † accepted as Dentellocaracolus hyperbolica (F. Sandberger, 1870) †
- Species Helix hyphasma Reeve, 1854 accepted as Euplecta hyphasma (Reeve, 1854)
- Species Helix hypolepta Shuttelworth, 1854 accepted as Hojeda hypolepta (Shuttleworth, 1854)
- Species Helix hypophloea R. A. Philippi, 1855 accepted as Radiodiscus hypophloea (R. A. Philippi, 1855)
- Species Helix hypopolea Reeve, 1852 accepted as Phacussa hypopolea (Reeve, 1852)
- Species Helix hypopolia L. Pfeiffer, 1853 accepted as Phacussa hypopolea (Reeve, 1852)
- Species Helix hyptiocyclos W. H. Benson, 1863 accepted as Sivella hyptiocyclos (W. H. Benson, 1863)
- Species Helix hystricella L. Pfeiffer, 1859 accepted as Cookeconcha hystricella (L. Pfeiffer, 1859)
- Species Helix hystrix L. Pfeiffer, 1846 accepted as Cookeconcha hystrix (L. Pfeiffer, 1846)
- Species Helix hystrix J. C. Cox, 1868 accepted as Mussonena spinei (J. C. Cox, 1868)
- Species Helix iae Pallary, 1899
- Species Helix iberica Rambur, 1869 accepted as Helicella iberica (Rambur, 1869)
- Species Helix ibrahimi Bourguignat, 1884 accepted as Otala lactea (O. F. Müller, 1774)
- Species Helix ibuensis L. Pfeiffer, 1846 accepted as Trochozonites ibuensis (L. Pfeiffer, 1846)
- Species Helix ichthyomma Held, 1837
- Species Helix idahoensis Newcomb, 1866 accepted as Oreohelix idahoensis (Newcomb, 1866)
- Species Helix ide J. E. Gray, 1850 accepted as Suteria ide (J. E. Gray, 1850)
- Species Helix idia Issel, 1885 accepted as Xeroplana idia (Issel, 1885)
- Species Helix idiophya Florence, 1886 accepted as Candidula unifasciata acosmia (Bourguignat, 1882)
- Species Helix idiotrypa Mabille, 1882 accepted as Hemicycla consobrina (A. Férussac, 1822)
- Species Helix idryta Mabille, 1882 accepted as Hemicycla bidentalis (Lamarck, 1822)
- Species Helix ierensis Guppy, 1868 accepted as Thysanophora plagioptycha (Shuttleworth, 1854)
- Species Helix ignava L. Pfeiffer, 1855
- Species Helix ignescens L. Pfeiffer, 1861 accepted as Nanina ignescens (L. Pfeiffer, 1861)
- Species Helix igniflua Reeve, 1852 accepted as Thalassohelix igniflua (Reeve, 1852)
- Species Helix ignobilis G. B. Sowerby I, 1841 accepted as Cochlodryas ignobilis (G. B. Sowerby I, 1841)
- Species Helix ignota Mabille, 1865 accepted as Xeroplexa intersecta (Poiret, 1801)
- Species Helix illusa Servain, 1889
- Species Helix illustris L. Pfeiffer, 1863 accepted as Camaena illustris (L. Pfeiffer, 1863)
- Species Helix illuviosa G. Nevill, 1880 accepted as Xerotricha conspurcata (Draparnaud, 1801)
- Species Helix illyrica Stabile, 1864 accepted as Campylaea illyrica (Stabile, 1864)
- Species Helix iloconensis G. B. Sowerby I, 1841 accepted as Pachysphaera iloconensis (G. B. Sowerby I, 1841)
- Species Helix imbricata A. Braun, 1851 † accepted as Helix discus Thomä, 1845 †
- Species Helix immaculata A. Adams & Reeve, 1850 accepted as Satsuma largillierti (L. Pfeiffer, 1849)
- Species Helix immersa L. Pfeiffer, 1858
- Species Helix immunda C. B. Adams, 1849 accepted as Corneosagda immunda (C. B. Adams, 1849)
- Species Helix impatiens Heude, 1885 accepted as Bradybaena impatiens (Heude, 1885)
- Species Helix imperfecta Deshayes, 1863 accepted as Caldwellia imperfecta (Deshayes, 1863)
- Species Helix impexa Reeve, 1852 accepted as Expocystis rustica (L. Pfeiffer, 1852)
- Species Helix impressa Blainville, 1821 accepted as Cepolis cepa (O. F. Müller, 1774)
- Species Helix improbata Mousson, 1861 accepted as Xerocrassa langloisiana (Bourguignat, 1853)
- Species Helix improvisa Heude, 1885
- Species Helix impugnata Mousson, 1857 accepted as Theba impugnata (Mousson, 1857)
- Species Helix impura L. Pfeiffer, 1866 accepted as Thysanophora impura (L. Pfeiffer, 1866)
- Species Helix imula Locard, 1899 accepted as Xeroplexa intersecta (Poiret, 1801)
- Species Helix inaequalis Reeve, 1854 accepted as Rhytida inaequalis (Reeve, 1854)
- Species Helix inaguensis Weinland, 1880 accepted as Hojeda inaguensis (Weinland, 1880)
- Species Helix inca A. d'Orbigny, 1835 accepted as Thaumastus inca (A. d'Orbigny, 1835)
- Species Helix incarnata O. F. Müller, 1774 accepted as Perforatella incarnata (O. F. Müller, 1774)
- Species Helix incarum R. A. Philippi, 1869 accepted as Solaropsis incarum (R. A. Philippi, 1869)
- Species Helix incei L. Pfeiffer, 1846 accepted as Figuladra incei (L. Pfeiffer, 1846)
- Species Helix incerta Draparnaud, 1805 accepted as Retinella incerta (Draparnaud, 1805)
- Species Helix incerta A. Férussac, 1823 accepted as Pleurodonte incerta (A. Férussac, 1823)
- Species Helix inchoata Morelet, 1845 accepted as Portugala inchoata (Morelet, 1845)
- Species Helix incisa L. Pfeiffer, 1866 accepted as Glyphyalinia barbadensis R. Chase & D. G. Robinson, 2001
- Species Helix incisa Gmelin, 1791
- Species Helix incisogranulata Mousson, 1872 accepted as Hemicycla incisogranulata (Mousson, 1872)
- Species Helix inclara Morelet, 1889 accepted as Trachycystis inclara (Morelet, 1889)
- Species Helix inclinata L. Pfeiffer, 1864 accepted as Zagmena inclinata (L. Pfeiffer, 1864)
- Species Helix incompta G. B. Sowerby I, 1841 accepted as Hypselostyla incompta (G. B. Sowerby I, 1841)
- Species Helix inconspicua Forbes, 1852 accepted as Expocystis rusticus (L. Pfeiffer, 1852)
- Species Helix inconspicua C. B. Adams, 1849 accepted as Microsagda inconspicua (C. B. Adams, 1849)
- Species Helix incrassata Klein, 1853 † accepted as Pseudochloritis incrassata (Klein, 1853) †
- Species Helix increscens Thomä, 1845 † accepted as Archaeozonites increscens (Thomä, 1845) †
- Species Helix incrustata Poey, 1852 accepted as Thysanophora incrustata (Poey, 1852)
- Species Helix indecorata A. Gould, 1850 accepted as Thapsia indecorata (A. Gould, 1850)
- Species Helix indentata Say, 1822 accepted as Glyphyalinia indentata (Say, 1822)
- Species Helix indica L. Pfeiffer, 1846 accepted as Euplecta indica (L. Pfeiffer, 1846)
- Species Helix indifferens Mousson, 1872 accepted as Hemicycla maugeana (Shuttleworth, 1852)
- Species Helix indigena Mabille, 1895 accepted as Greggelix indigena (Mabille, 1895)
- Species Helix indistincta A. Férussac, 1821 accepted as Plagioptycha indistincta (A. Férussac, 1821)
- Species Helix indusiata L. Pfeiffer, 1871 accepted as Helicostyla indusiata (L. Pfeiffer, 1871)
- Species Helix induta Tate, 1878 accepted as Cupedora evandaleana (L. Pfeiffer, 1864)
- Species Helix induta L. Pfeiffer, 1846 accepted as Elaphroconcha bataviana (L. Pfeiffer, 1842)
- Species Helix inermis Morelet, 1864 accepted as Gonaxis inermis (Morelet, 1864)
- Species Helix inesilla Mabille, 1889 accepted as Camaena choboensis (Mabille, 1889)
- Species Helix infans Reeve, 1854 accepted as Tanychlamys infans (Reeve, 1854)
- Species Helix infans L. Pfeiffer, 1855 accepted as Macrochlamys infans (Reeve, 1854)
- Species Helix infecta Reeve, 1852 accepted as Fectola infecta (Reeve, 1852)
- Species Helix infecta L. Pfeiffer, 1857
- Species Helix inflata Kobelt, 1876 accepted as Pseudotrizona inflata (Kobelt, 1876)
- Species Helix inflata Gmelin, 1791 accepted as Galba truncatula (O. F. Müller, 1774)
- Species Helix inflecta L. Pfeiffer, 1858 accepted as Anguispira alternata (Say, 1817)
- Species Helix inflecta Say, 1821 accepted as Inflectarius inflectus (Say, 1821)
- Species Helix inflexa Zieten, 1832 † accepted as Agalactochilus inflexus (Zieten, 1832) †
- Species Helix informis Mousson, 1869 accepted as Sphaerospira informis (Mousson, 1869)
- Species Helix infortunata Bland, 1854 accepted as Proserpinula infortunata (Bland, 1854)
- Species Helix infracta E. von Martens, 1896 accepted as Planispira infracta (E. von Martens, 1896)
- Species Helix infrafusca E. von Martens, 1900 accepted as Halolimnohelix infrafusca (E. von Martens, 1900)
- Species Helix infrastriata E. A. Smith, 1884 accepted as Trochonanina infrastriata (E. A. Smith, 1884)
- Species Helix infrendens A. Gould, 1843 accepted as Sesara infrendens (A. Gould, 1843)
- Species Helix infudibulus Hombron & Jacquinot, 1841 accepted as Tuimalila infudibulus (Hombron & Jacquinot, 1841)
- Species Helix infula W. H. Benson, 1848 accepted as Sitala infula (W. H. Benson, 1848)
- Species Helix infumata A. Gould, 1855 accepted as Monadenia infumata infumata (A. Gould, 1855)
- Species Helix infundibuliformis A. d'Orbigny, 1835 accepted as Gibbulina infundibuliformis (A. d'Orbigny, 1835)
- Species Helix infundibulum Valenciennes, 1846 accepted as Helicophanta falconeri J. E. Gray, 1834
- Species Helix infundibulum Hombron & Jacquinot, 1841 accepted as Endodonta (Flammulina) infundibulum (Hombron & Jacquinot, 1841)
- Species Helix infuscata Albers, 1854 accepted as Calocochlea infuscata (Albers, 1854)
- Species Helix ingallsiana P. Fischer, 1877 accepted as Mesodon clausus (Say, 1821)
- Species Helix ingens C. B. Adams, 1850 accepted as Lucerna lamarckii (A. Férussac, 1821)
- Species Helix ingersollii Bland, 1875 accepted as Microphysula ingersollii (Bland, 1875)
- Species Helix ingloria Heude, 1890
- Species Helix ingoi Cafici, 1884
- Species Helix ingrami Blanford, 1876
- Species Helix ingrami Hanley & Theobald, 1874 accepted as Sesara ingrami (Hanley & Theobald, 1874)
- Species Helix initialis Heude, 1882 accepted as Aegista accrescens initialis (Heude, 1882)
- Species Helix injussa W. T. Blanford & H. F. Blanford, 1861 accepted as Sitala injussa (W. T. Blanford & H. F. Blanford, 1861)
- Species Helix innominata Heude, 1885 accepted as Pseudiberus innominatus (Heude, 1885)
- Species Helix innominata Gray, 1825 accepted as Caseolus innominatus (J. E. Gray, 1825)
- Species Helix inopinata Deshayes, 1870 accepted as Trichocathaica inopinata (Deshayes, 1870)
- Species Helix inops Morelet, 1889 accepted as Helix inclara Morelet, 1889
- Species Helix inops Mousson, 1872 accepted as Monilearia inops (Mousson, 1872)
- Species Helix inornata Say, 1822 accepted as Mesomphix inornatus (Say, 1822)
- Species Helix inquieta Dohrn, 1889 accepted as Chloritis inquieta (Dohrn, 1889)
- Species Helix inquinata L. Pfeiffer, 1842 accepted as Asperitas inquinata (L. Pfeiffer, 1842)
- Species Helix inquinata von dem Busch, 1842 accepted as Asperitas inquinata (L. Pfeiffer, 1842)
- Species Helix insculpta L. Pfeiffer, 1846 accepted as Fanulena insculpta (L. Pfeiffer, 1846)
- Species Helix insignis Zieten, 1832 † accepted as Joossia insignis (Zieten, 1832) †
- Species Helix insignis A. d'Orbigny, 1835 accepted as Systrophia insignis (A. d'Orbigny, 1835)
- Species Helix insititia Shuttleworth, 1854 accepted as Caracolus insititia (Shuttleworth, 1854)
- Species Helix insoleta Westerlund, 1889 accepted as Helix insolita Rossmässler, 1838
- Species Helix insolita Rossmässler, 1838 accepted as Liburnica insolita (Rossmässler, 1838)
- Species Helix instabilis Rossmässler, 1838 accepted as Helicopsis instabilis (Rossmässler, 1838)
- Species Helix instricta E. von Martens, 1864
- Species Helix instrumosa Dall, 1890 † accepted as Cepolis instrumosa (Dall, 1890) †
- Species Helix insueta Noulet, 1868 †
- Species Helix insularis Crosse & Debeaux, 1869 accepted as Tacheocampylaea insularis (Crosse & Debeaux, 1869)
- Species Helix intaminata A. Gould, 1852 accepted as Chloraea intaminata (A. Gould, 1852)
- Species Helix intercarinata Mighels, 1845 accepted as Cookeconcha intercarinata (Mighels, 1845)
- Species Helix intercisa W. G. Binney, 1857 accepted as Xerarionta intercisa (W. G. Binney, 1857)
- Species Helix intermedia C. Pfeiffer, 1828 accepted as Kosicia intermedia (C. Pfeiffer, 1828)
- Species Helix intermedia Grateloup, 1828 † accepted as Leucochroopsis grateloupi (Wenz, 1919) †
- Species Helix intermissa Westerlund, 1897 accepted as Helix albescens Rossmässler, 1839
- Species Helix interna Say, 1821 accepted as Gastrodonta interna (Say, 1821)
- Species Helix interrupta W. H. Benson, 1834 accepted as Ariophanta himalana (I. Lea, 1834)
- Species Helix interrupta O. F. Müller, 1774 accepted as Amphidromus perversus (Linnaeus, 1758)
- Species Helix intersecta Poiret, 1801 accepted as Xeroplexa intersecta (Poiret, 1801)
- Species Helix intertextus A. Binney, 1840 accepted as Ventridens intertextus (A. Binney, 1840)
- Species Helix intincta Shuttleworth, 1852 accepted as Chloraea sphaerion (G. B. Sowerby I, 1841)
- Species Helix intorta G. B. Sowerby I, 1841 accepted as Chloraea intorta (G. B. Sowerby I, 1841)
- Species Helix intricata Noulet, 1854 † accepted as Palaeoxestina serpentinites (Boubée, 1831) †
- Species Helix introferens Bland, 1860 accepted as Triodopsis fallax (Say, 1825)
- Species Helix intumescens E. von Martens, 1867 accepted as Landouria intumescens (E. von Martens, 1867)
- Species Helix intusplicata L. Pfeiffer, 1851 accepted as Codringtonia intusplicata (L. Pfeiffer, 1851)
- Species Helix inutilis Mousson, 1872 accepted as Hemicycla inutilis (Mousson, 1872)
- Species Helix invalida C. B. Adams, 1850 accepted as Dentellaria invalida (C. B. Adams, 1850)
- Species Helix invecta Mabille, 1895 accepted as Greggelix loehrii (Gabb, 1868)
- Species Helix invernicata Mousson, 1872 accepted as Hemicycla invernicata (Mousson, 1872)
- Species Helix inversa O. F. Müller, 1774 accepted as Amphidromus inversus (O. F. Müller, 1774)
- Species Helix inversa Westerlund, 1888
- Species Helix inversicolor A. Férussac, 1822 accepted as Pachystyla bicolor (Lamarck, 1822)
- Species Helix invia Heude, 1885 accepted as Sicradiscus invius (Heude, 1885)
- Species Helix involuta Thomä, 1845 † accepted as Protodrepanostoma involutum (Thomä, 1845) †
- Species Helix involuta L. Pfeiffer, 1845 accepted as Guestieria powisiana (L. Pfeiffer, 1848)
- Species Helix involutaeformis Sinzov, 1875 † accepted as Helicodonta involutaeformis (Sinzov, 1875) †
- Species Helix involvulus O. F. Müller, 1774 accepted as Cyclophorus involvulus (O. F. Müller, 1774)
- Species Helix iota L. Pfeiffer, 1853 accepted as Phenacohelix pilula (Reeve, 1852)
- Species Helix irosinensis Hidalgo, 1887 accepted as Chloraea irosinensis (Hidalgo, 1887)
- Species Helix isaaci Nobre, 1905
- Species Helix isabella A. Férussac, 1821
- Species Helix isabella Hombron & Jacquinot, 1841
- Species Helix isabellensis Souverbie, 1863 accepted as Crystallopsis lactiflua (L. Pfeiffer, 1861)
- Species Helix isabellina Reeve, 1854 accepted as Euplecta isabellina (Reeve, 1854)
- Species Helix isarica Locard, 1882 accepted as Urticicola isaricus (Locard, 1882)
- Species Helix ischnia Mabille, 1880
- Species Helix isilensis L. Pfeiffer, 1853 accepted as Marmorana serpentina isilensis (L. Pfeiffer, 1848)
- Species Helix isis L. Pfeiffer, 1860 accepted as Discoconcha isis (L. Pfeiffer, 1860)
- Species Helix isodon Reeve, 1853 accepted as Labyrinthus isodon (Reeve, 1853)
- Species Helix isognomostomos Schröter, 1784 accepted as Isognomostoma isognomostomos (Schröter, 1784)
- Species Helix isseli Morelet, 1872 accepted as Lejeania isseli (Morelet, 1872)
- Species Helix istera Bourguignat, 1887 accepted as Xerotricha apicina (Lamarck, 1822)
- Species Helix itala Linnaeus, 1758 accepted as Helicella itala (Linnaeus, 1758)
- Species Helix italica De Stefani, 1876 † accepted as Eobania vermicularia (Michelotti, 1840) †
- Species Helix iuloidea Forbes, 1852 accepted as Whitcochlea iuloidea (Forbes, 1852)
- Species Helix iurensis Münster, 1844 †
- Species Helix jacksoniensis J. E. Gray, 1834 accepted as Brevisentis jacksoniensis (J. E. Gray, 1834)
- Species Helix jacksonii Bland, 1866 accepted as Daedalochila jacksonii (Bland, 1866)
- Species Helix jacob Gredler, 1887
- Species Helix jacobensis C. B. Adams, 1851 accepted as Dialeuca conspersula platystyla (L. Pfeiffer, 1850)
- Species Helix jacquematana Mabille, 1883
- Species Helix jacquinoti L. Pfeiffer, 1849 accepted as Libera jacquinoti (L. Pfeiffer, 1849)
- Species Helix jaculata Mabille, 1887 accepted as Camaena gabriellae (Dautzenberg & d'Hammonville, 1887)
- Species Helix jamaicensis Gmelin, 1791 accepted as Eurycratera jamaicensis (Gmelin, 1791)
- Species Helix janeirensis L. Pfeiffer, 1852 accepted as Smenodonta janeirensis (L. Pfeiffer, 1852)
- Species Helix jannellei Le Guillou, 1842 accepted as Xanthomelon jannellei (Le Guillou, 1842)
- Species Helix janthina Linnaeus, 1758 accepted as Janthina janthina (Linnaeus, 1758)
- Species Helix janthina Forsskål, 1775 accepted as Janthina janthina (Linnaeus, 1758)
- Species Helix janthina Mabille, 1883
- Species Helix janthinoides Noulet, 1868 † accepted as Eurystrophe olla (de Serres, 1844) †
- Species Helix janus C. B. Adams, 1841 accepted as Perpolita electrina (Gould, 1841)
- Species Helix japonica L. Pfeiffer, 1847 accepted as Satsuma japonica (L. Pfeiffer, 1847)
- Species Helix jasonis Mayer, 1856 †
- Species Helix jasonis Mousson, 1861 accepted as Jasonella mingrelica (P. Hesse, 1918)
- Species Helix jaspidea L. Pfeiffer, 1859 accepted as Epiphragmophora jaspidea (L. Pfeiffer, 1859)
- Species Helix jaudenesi Arango, 1876
- Species Helix javacensis A. Férussac, 1821 accepted as Elaphroconcha javacensis (A. Férussac, 1821)
- Species Helix jayana C. B. Adams, 1845 accepted as Sagda jayana (C. B. Adams, 1845)
- Species Helix jeannotiana Terver, 1839
- Species Helix jebusitica J. R. Roth, 1855 accepted as Eopolita protensa jebusitica (J. R. Roth, 1855)
- Species Helix jeffreysiana L. Pfeiffer, 1853 accepted as Delos jeffreysiana (Reeve, 1852)
- Species Helix jeffreysiana Reeve, 1852 accepted as Delos jeffreysiana (Reeve, 1852)
- Species Helix jejuna Say, 1821 accepted as Praticolella jejuna (Say, 1821)
- Species Helix jenisoniana Gistel, 1848
- Species Helix jenynsi L. Pfeiffer, 1846 accepted as Sitala jenynsi (L. Pfeiffer, 1846)
- Species Helix jervisensis Quoy & Gaimard, 1832 accepted as Sauroconcha jervisensis (Quoy & Gaimard, 1832)
- Species Helix jeschaui Kobelt, 1878 accepted as Mengoana jeschaui (Kobelt, 1878)
- Species Helix joannis Mortillet, 1854 accepted as Caucasocressa joannis (Mortillet, 1854)
- Species Helix jobaeana Crosse, 1861 † accepted as Otala jobaeana (Crosse, 1861) †
- Species Helix johannis Poey, 1858 accepted as Daedalochila poeyi (Aguayo & Jaume, 1947)
- Species Helix johnii Holten, 1802 accepted as Recluzia johnii (Holten, 1802)
- Species Helix johnstonei Brazier, 1875 accepted as Steorra mourilyani (Brazier, 1875)
- Species Helix jonasi L. Pfeiffer, 1846 accepted as Helicostyla jonasi (L. Pfeiffer, 1846)
- Species Helix joossii K. Miller, 1907 † accepted as Klikia joossii (K. Miller, 1907) †
- Species Helix joppensis A. Schmidt, 1855 accepted as Xeropicta krynickii (Krynicki, 1833)
- Species Helix josephinae A. Férussac, 1832 accepted as Pleurodonte josephinae (A. Férussac, 1832)
- Species Helix jourdani Michaud, 1862 † accepted as Retinella (Lyrodiscus) jourdani (Michaud, 1862) †
- Species Helix jourdyi Morlet, 1886 accepted as Bradybaena jourdyi (Morlet, 1886)
- Species Helix jucarensis Revilla & Quintero, 1958 †
- Species Helix jucunda L. Pfeiffer, 1864 accepted as Everettia jucunda (L. Pfeiffer, 1864)
- Species Helix jugosa Mighels, 1845 accepted as Cookeconcha jugosus (Mighels, 1845)
- Species Helix juilleti Terver, 1839 accepted as Otala juilleti (Terver, 1839)
- Species Helix julia A. Férussac, 1821 accepted as Lucerna lucerna (O. F. Müller, 1774)
- Species Helix juliana Poey, 1853 accepted as Coryda alauda (A. Férussac, 1821)
- Species Helix juliformis R. T. Lowe, 1852 accepted as Serratorotula juliformis (R. T. Lowe, 1852)
- Species Helix juloidea Reeve, 1854 accepted as Whitcochlea iuloidea (Forbes, 1852)
- Species Helix jungermanniae Petterd, 1879 accepted as Pasmaditta jungermanniae (Petterd, 1879)
- Species Helix jungermanniarum R. A. Philippi, 1855
- Species Helix jungneri d'Ailly, 1896
- Species Helix juno L. Pfeiffer, 1850 accepted as Isomeria juno (L. Pfeiffer, 1850)
- Species Helix justi L. Pfeiffer, 1858
- Species Helix justini Mabille, 1883 accepted as Hemicycla bidentalis bidentalis (Lamarck, 1822)
- Species Helix kabyliana Gassies, 1858
- Species Helix kadolskyi Neubauer & Harzhauser, 2023 †
- Species Helix kalganensis Möllendorff, 1874 accepted as Cathaica subrugosa kalganensis (Möllendorff, 1874)
- Species Helix kalmitana A. Braun, 1851 † accepted as Praeoestophorella phacodes (Thomä, 1845) †
- Species Helix kanabensis C. A. White, 1876 † accepted as Kanabohelix kanabensis (C. A. White, 1876) †
- Species Helix kanakina Gassies, 1866 accepted as Ptychorhytida kanakina (Gassies, 1866)
- Species Helix kannariae Petterd, 1879 accepted as Kannaropa subrugosa (Legrand, 1871)
- Species Helix kappa L. Pfeiffer, 1853 accepted as Neophenacohelix giveni (Cumber, 1961)
- Species Helix karewia E. von Martens, 1892 accepted as Haplohelix karewia (E. von Martens, 1892)
- Species Helix katauensis Tapparone Canefri, 1883 accepted as Rhynchotrochus strabo (Brazier, 1876)
- Species Helix kawaiensis L. Pfeiffer, 1855 accepted as Helix kawaiensis Reeve, 1854
- Species Helix kawaiensis Reeve, 1854 accepted as Hawaiia minuscula (A. Binney, 1841)
- Species Helix kazouiniana (Pallary, 1939)
- Species Helix kellettii Forbes, 1850 accepted as Xerarionta kellettii (Forbes, 1850)
- Species Helix kempseyensis J. C. Cox, 1872 accepted as Iotula microcosmos (J. C. Cox, 1868)
- Species Helix keppelli Reeve, 1854 accepted as Orpiella keppelli (Reeve, 1854)
- Species Helix keratina Heude, 1890
- Species Helix keraudrenii Hombron & Jacquinot, 1841
- Species Helix kermadecensis (E. A. Smith, 1873) accepted as Kermarion kermadecensis (E. A. Smith, 1873)
- Species Helix kermandeci L. Pfeiffer, 1857 accepted as Kieconcha kermandeci (L. Pfeiffer, 1857)
- Species Helix kermorvani Collard des Cherres, 1830 accepted as Elona quimperiana (Blainville, 1821)
- Species Helix kershawi Petterd, 1879 accepted as Bonhamaropa kershawi (Petterd, 1879)
- Species Helix kiangsiensis E. von Martens, 1875 accepted as Bradybaena kiangsinensis (E. von Martens, 1875)
- Species Helix kiangsinensis E. von Martens, 1875 accepted as Mastigeulota kiangsinensis (E. von Martens, 1875)
- Species Helix kierulfi Mörch, 1850 accepted as Trochomorpha kierulfi (Mörch, 1850)
- Species Helix kiesneri Le Guillou, 1842
- Species Helix kilimae E. von Martens, 1895 accepted as Haplohelix kilimae (E. von Martens, 1895)
- Species Helix kingi L. Pfeiffer, 1846
- Species Helix kleciachi L. Pfeiffer, 1871 accepted as Liburnica kleciachi (L. Pfeiffer, 1871)
- Species Helix kleinii Klein, 1846 † accepted as Leucochroopsis kleinii (Klein, 1846) †
- Species Helix knitteli Servain, 1889
- Species Helix knysnaensis L. Pfeiffer, 1846 accepted as Afrorhytida knysnaensis (L. Pfeiffer, 1846)
- Species Helix kobeltiana L. Pfeiffer, 1871
- Species Helix kobiensis O. Boettger, 1883 accepted as Fruticocampylaea kobensis (O. Boettger, 1883)
- Species Helix kochi L. Pfeiffer, 1846 accepted as Anguispira kochi (L. Pfeiffer, 1846)
- Species Helix kolaschinensis Kobelt, 1898 accepted as Helix dormitoris (Kobelt, 1898)
- Species Helix koleensis Bourguignat, 1862 † accepted as Cernuella koleensis (Bourguignat, 1862) †
- Species Helix kollari L. Pfeiffer, 1856 accepted as Kollarix kollari (L. Pfeiffer, 1856)
- Species Helix kompsa Mabille, 1883 accepted as Canaridiscus kompsus (Mabille, 1883)
- Species Helix kopnodes W. G. Binney, 1857 accepted as Mesomphix capnodes (W. G. Binney, 1857)
- Species Helix koraegaelia Bourguignat, 1882 accepted as Cantareus koraegaelius (Bourguignat, 1882)
- Species Helix koreana L. Pfeiffer, 1850 accepted as Fruticicola koreana (L. Pfeiffer, 1850)
- Species Helix kotschyi L. Pfeiffer, 1846
- Species Helix koutoumensis Gassies, 1871 accepted as Andrefrancia ostiolum (Crosse, 1870)
- Species Helix kraussi L. Pfeiffer, 1846 accepted as Afrorhytida kraussi (L. Pfeiffer, 1846)
- Species Helix kreffti J. C. Cox, 1864 accepted as Pravonitor kreffti (J. C. Cox, 1864)
- Species Helix kreglingeri Kobelt, 1876 accepted as Metafruticicola pellita (A. Férussac, 1832)
- Species Helix kreitneri Hilber, 1883 † accepted as Cathaica kreitneri (Hilber, 1883) †
- Species Helix krejcii Wenz, 1926 †
- Species Helix krynickii Krynicki, 1833 accepted as Xeropicta krynickii (Krynicki, 1833)
- Species Helix kuangtunensis Gredler, 1881
- Species Helix kuehni L. Pfeiffer, 1872 accepted as Solaropsis nubeculata (Deshayes, 1831)
- Species Helix kuesteri L. Pfeiffer, 1845 accepted as Trochomorpha kuesteri (L. Pfeiffer, 1845)
- Species Helix kurdistana L. Pfeiffer, 1861 accepted as Levantina kurdistana (L. Pfeiffer, 1861)
- Species Helix kurri L. Pfeiffer, 1848 accepted as Planispira kurri (L. Pfeiffer, 1848)
- Species Helix kutschigi L. Pfeiffer, 1865
- Species Helix labassetieri de Morgan, 1920 † accepted as Eostrobilops labassetieri (de Morgan, 1920) †
- Species Helix labiata L. Pfeiffer, 1845 accepted as Bensonies monticola (W. H. Benson, 1838)
- Species Helix labilis A. Gould, 1859 accepted as Trochochlamys labilis (A. Gould, 1859)
- Species Helix labillardierei E. A. Smith, 1884 accepted as Trochonanina helicinoides labillardierei (E. A. Smith, 1884)
- Species Helix labiosa Montagu, 1803 accepted as Rissoa membranacea (J. Adams, 1800)
- Species Helix labiosa A. Gould, 1846 accepted as Vespericola columbiana (I. Lea, 1838)
- Species Helix labiosa O. F. Müller, 1774 accepted as Euryptyxis labiosa (O. F. Müller, 1774)
- Species Helix labiosa Locard, 1899 accepted as Ponentina ponentina (Morelet, 1845)
- Species Helix labium A. Férussac, 1832 accepted as Papuina labium (A. Férussac, 1832)
- Species Helix labium L. Pfeiffer, 1848 accepted as Papuina pseudolabium (L. Pfeiffer, 1868)
- Species Helix labrella Lamarck, 1822 accepted as Ampelita sepulcralis (A. Férussac, 1821)
- Species Helix labrosa Bland, 1862 accepted as Stenotrema labrosum (Bland, 1862)
- Species Helix labuanensis L. Pfeiffer, 1864 accepted as Geotrochus labuanensis (L. Pfeiffer, 1864)
- Species Helix labyrinthica Say, 1817 accepted as Strobilops labyrinthicus (Say, 1817)
- Species Helix labyrinthicula Michaud, 1855 † accepted as Strobilops labyrinthiculus (Michaud, 1855) †
- Species Helix labyrinthus Chemnitz, 1795 accepted as Labyrinthus otis ([Lightfoot], 1786)
- Species Helix labyrinthus Lamarck, 1792 accepted as Labyrinthus plicatus (Born, 1778)
- Species Helix lacera Reeve, 1854 accepted as Orthostylus lacerus (Reeve, 1854)
- Species Helix lacerdai Nobre, 1905
- Species Helix lacertarum Bourguignat, 1863 accepted as Xerocrassa (Xerocrassa) lacertara (Bourguignat, 1863)
- Species Helix lachesis Deshayes, 1850 accepted as Ampelita lachesis (Deshayes, 1850)
- Species Helix laciniata Heude, 1882 accepted as Plectotropis trichotropis laciniata (Heude, 1882)
- Species Helix laciniosa Heude, 1885 accepted as Helix laciniosula Heude, 1885
- Species Helix laciniosula Heude, 1885 accepted as Plectotropis laciniosula (Heude, 1885)
- Species Helix lactea O. F. Müller, 1774 accepted as Otala lactea (O. F. Müller, 1774)
- Species Helix lacteolata E. A. Smith, 1887 accepted as Canefriula lacteolata (E. A. Smith, 1887)
- Species Helix lactiflua L. Pfeiffer, 1861 accepted as Crystallopsis lactiflua (L. Pfeiffer, 1861)
- Species Helix lacuna Montagu, 1803 accepted as Lacuna parva (da Costa, 1778)
- Species Helix lacunosa A. d'Orbigny, 1835 accepted as Megalobulimus lacunosus (A. d'Orbigny, 1835)
- Species Helix laesa Reeve, 1854
- Species Helix laeta A. Gould, 1859 accepted as Ezohelix gainesi (Pilsbry, 1900)
- Species Helix laeta Reeve, 1854
- Species Helix laeva O. F. Müller, 1774 accepted as Amphidromus laevus (O. F. Müller, 1774)
- Species Helix laevigata Linnaeus, 1767 accepted as Velutina laevigata (Linnaeus, 1767)
- Species Helix laevigata A. Férussac, 1821 accepted as Mesomphix vulgatus H. B. Baker, 1933
- Species Helix laevipes O. F. Müller, 1774 accepted as Ariophanta laevipes (O. F. Müller, 1774)
- Species Helix lagunae Hidalgo, 1887 accepted as Mesanella monochroa lagunae (Hidalgo, 1887)
- Species Helix lahatensis de Morgan, 1885 accepted as Hemiplecta lahatensis (de Morgan, 1885)
- Species Helix laidlayana W. H. Benson, 1856 accepted as Ariophanta laidlayana (W. H. Benson, 1856)
- Species Helix lais Reeve, 1853 accepted as Chloraea puella lais (Reeve, 1853)
- Species Helix lalloensis L. Pfeiffer, 1855 accepted as Calocochlea lalloensis (L. Pfeiffer, 1855)
- Species Helix lamalouensis Reynès, 1870 accepted as Monacha lamalouensis (Reynès, 1870)
- Species Helix lamarckiana I. Lea, 1840 accepted as Lamarckiella stolephora lamarckiana (I. Lea, 1840)
- Species Helix lamarckii A. Férussac, 1821 accepted as Lucerna lamarckii (A. Férussac, 1821)
- Species Helix lamarei L. Pfeiffer, 1853 accepted as Ampelita lamarei (L. Pfeiffer, 1853)
- Species Helix lambda L. Pfeiffer, 1853 accepted as Thalassohelix igniflua (Reeve, 1852)
- Species Helix lambei L. Pfeiffer, 1856 accepted as Megalacron lambei (L. Pfeiffer, 1856)
- Species Helix lamellata M. Bielz, 1851
- Species Helix lamellata Jeffreys, 1830 accepted as Spermodea lamellata (Jeffreys, 1830)
- Species Helix lamellifera C. B. Adams, 1849 accepted as Meiophysema lamelliferum (C. B. Adams, 1849)
- Species Helix lamellosa A. Férussac, 1825 accepted as Endodonta lamellosa (A. Férussac, 1825)
- Species Helix laminata Pease, 1866 accepted as Endodonta laminata (Pease, 1866)
- Species Helix lampas O. F. Müller, 1774 accepted as Pyrochilus lampas (O. F. Müller, 1774)
- Species Helix lampedusae Kobelt, 1890 accepted as Cernuella lampedusae (Kobelt, 1890)
- Species Helix lampra Reeve, 1854 accepted as Victaphanta lampra (Reeve, 1854)
- Species Helix lamproides J. C. Cox, 1868 accepted as Tasmaphena lamproides (J. C. Cox, 1868)
- Species Helix lanceolata L. Pfeiffer, 1862 accepted as Papuina lanceolata (L. Pfeiffer, 1862)
- Species Helix lancerottensis P. B. Webb & S. Berthelot, 1833 accepted as Xerotricha lancerottensis (P. B. Webb & S. Berthelot, 1833)
- Species Helix lancula A. Férussac, 1821 accepted as Ampelita lancula (A. Férussac, 1821)
- Species Helix landsbergeana Dohrn, 1879 accepted as Chloritis landsbergeana (Dohrn, 1879)
- Species Helix langi Rossmässler, 1857 accepted as Josephinella phocaea (J. R. Roth, 1855)
- Species Helix langloisiana Bourguignat, 1853 accepted as Xerocrassa langloisiana (Bourguignat, 1853)
- Species Helix languescens Heude, 1890
- Species Helix languida L. Pfeiffer, 1843 accepted as Orthostylus languidus (L. Pfeiffer, 1843)
- Species Helix lanieriana A. d'Orbigny, 1841 accepted as Helix cubensis L. Pfeiffer, 1840
- Species Helix lanuginosa de Boissy, 1835 accepted as Ganula lanuginosa (de Boissy, 1835)
- Species Helix lanx A. Férussac, 1821 accepted as Ampelita madagascariensis (Lamarck, 1816)
- Species Helix laomontana L. Pfeiffer, 1863 accepted as Naggsia laomontana (L. Pfeiffer, 1863)
- Species Helix lapicida Linnaeus, 1758 accepted as Helicigona lapicida (Linnaeus, 1758)
- Species Helix lapicidella Thomä, 1845 † accepted as Pachycarocollina bouilletii (de Boissy, 1840) †
- Species Helix lapicidites Boubée, 1831 † accepted as Parachloraea lapicidites (Boubée, 1831) †
- Species Helix lapidaria Thomä, 1845 † accepted as Archaeoplecta lapidaria (Thomä, 1845) †
- Species Helix laqueata Baird, 1873 accepted as Lamprocystis unisulcata (Mousson, 1865)
- Species Helix largillierti L. Pfeiffer, 1849 accepted as Satsuma largillierti (L. Pfeiffer, 1849)
- Species Helix lariollei Pallary, 1899
- Species Helix larnacensis Rolle & Kobelt, 1896 accepted as Xeropicta krynickii (Krynicki, 1833)
- Species Helix lartetii de Boissy, 1840 † accepted as Megalotachea turonensis (Deshayes, 1832) †
- Species Helix lasallii Eydoux, 1838 accepted as Obba lasallei (Eydoux, 1838)
- Species Helix lasia Bourguignat, 1863 accepted as Schileykiella lasia (Bourguignat, 1863)
- Species Helix lasmodon J. S. Phillips, 1841 accepted as Ventridens lasmodon (J. S. Phillips, 1841)
- Species Helix lassusiana Noulet, 1854 † accepted as Megalotachea turonensis (Deshayes, 1832) †
- Species Helix latastei A. Letourneux, 1887 accepted as Xerocrassa (Xerocrassa) latastei (A. Letourneux, 1887)
- Species Helix latasteopsis A. Letourneux & Bourguignat, 1887 accepted as Xerocrassa (Xerocrassa) latasteopsis (A. Letourneux & Bourguignat, 1887)
- Species Helix latebrosa Dall, 1890 † accepted as Cepolis latebrosa (Dall, 1890) †
- Species Helix latecava E. von Martens, 1879
- Species Helix latens C. T. Lowe, 1852 accepted as Spirorbula latens (R. T. Lowe, 1852)
- Species Helix latiaxis E. A. Smith, 1883 accepted as Letitia latiaxis (E. A. Smith, 1883)
- Species Helix latina Paiva, 1866 † accepted as Spirorbula latina (Paiva, 1866) †
- Species Helix latitans Broderip, 1841 accepted as Trachystyla cryptica latitans (Broderip, 1841)
- Species Helix latizona L. Pfeiffer, 1864 accepted as Planispira latizona (L. Pfeiffer, 1864)
- Species Helix latrunculorum Heude, 1885
- Species Helix launcestonensis Reeve, 1853 accepted as Anoglypta launcestonensis (Reeve, 1853)
- Species Helix lauracina Fagot, 1883
- Species Helix laurenti Bourguignat, 1870 accepted as Iberus gualtieranus laurenti (Bourguignat, 1870)
- Species Helix laurillardiana Noulet, 1854 † accepted as Klikia giengensis (Klein, 1846) †
- Species Helix laurinae Issel, 1885
- Species Helix lausanni Dumont & Mortillet, 1852 † accepted as Cepaea lausanni (Dumont & Mortillet, 1852) †
- Species Helix lautricensis Noulet, 1868 † accepted as Strobilops (Strobilops) sublabyrinthica (F. E. Edwards, 1852) †
- Species Helix laxata Hidalgo, 1870 accepted as Macrocyclis peruvianus (Lamarck, 1822)
- Species Helix laxecostulata F. Sandberger, 1871 † accepted as Laxecostula laxecostulata (F. Sandberger, 1871) †
- Species Helix layardi Reeve, 1852 accepted as Euplecta layardi (Reeve, 1852)
- Species Helix leachi A. Férussac, 1832 accepted as Gyrostomella tripolitana (W. Wood, 1828)
- Species Helix leacockiana Wollaston, 1878 accepted as Wollastonaria leacockiana (Wollaston, 1878)
- Species Helix leaii A. Binney, 1840 accepted as Euchemotrema leaii leaii (A. Binney, 1840)
- Species Helix lecointrae Collot, 1911 † accepted as Megalotachea turonensis f. lecointrae (Collot, 1911) †
- Species Helix lecontii I. Lea, 1852 accepted as Trilobopsis loricata loricata (A. Gould, 1846)
- Species Helix lecythis W. H. Benson, 1852 accepted as Tanychlamys lecythis (W. H. Benson, 1852)
- Species Helix ledereri L. Pfeiffer, 1856 accepted as Xeropicta ledereri ledereri (L. Pfeiffer, 1856)
- Species Helix ledrui Mabille, 1883 accepted as Hemicycla gaudryi (A. d'Orbigny, 1839)
- Species Helix leei J. C. Cox, 1873 accepted as Disteustoma leei (J. C. Cox, 1873)
- Species Helix lefeburiana A. Férussac, 1821 accepted as Campylaea lefeburiana (A. Férussac, 1821)
- Species Helix legrandi J. C. Cox, 1868 accepted as Tasmathera legrandi (J. C. Cox, 1868)
- Species Helix leichardti J. C. Cox, 1864 accepted as Strangesta confusa (L. Pfeiffer, 1855)
- Species Helix leidyi J. Hall & Meek, 1855 † accepted as Skinnerelix leidyi (J. Hall & Meek, 1855) †
- Species Helix leiophis W. H. Benson, 1860 accepted as Chersaecia leiophis (W. H. Benson, 1860)
- Species Helix lejeaniana Bourguignat, 1883 accepted as Lejeania isseli (Morelet, 1872)
- Species Helix lemani Brongniart, 1810 † accepted as Leucochroopsis (Palaeotrichia) lemani (Brongniart, 1810) †
- Species Helix lemniscata Brumati, 1838 accepted as Helix cincta O. F. Müller, 1774
- Species Helix lemniscata P. B. Webb & S. Berthelot, 1833 accepted as Monilearia montigena Bank, Groh & Ripken, 2002
- Species Helix lemniscata R. P. Lesson, 1831
- Species Helix lemoinei Kobelt, 1882
- Species Helix lenabaria A. Letourneux, 1870
- Species Helix lenelaia Mabille, 1880
- Species Helix lennepiana L. Pfeiffer, 1852 accepted as Asperitas trochus (O. F. Müller, 1774)
- Species Helix lens A. Férussac, 1832 accepted as Lindholmiola lens (A. Férussac, 1832)
- Species Helix lensiana Fagot, 1883
- Species Helix lenta Solander, 1766 † accepted as Viviparus lentus (Solander, 1766) †
- Species Helix lenta L. Pfeiffer, 1854
- Species Helix lenticula Michaud, 1831 accepted as Caracollina lenticula (Michaud, 1831)
- Species Helix lenticula Held, 1837
- Species Helix lenticula A. Férussac, 1821 accepted as Caracollina lenticula (Michaud, 1831)
- Species Helix lenticularis Morelet, 1853 accepted as Oestophora dorotheae P. Hesse, 1930
- Species Helix lentiformis Mousson, 1859 accepted as Lindholmiola lens (A. Férussac, 1832)
- Species Helix lentina E. von Martens, 1885 accepted as Paedhoplita lentina (E. von Martens, 1885)
- Species Helix leobersdorfensis Troll, 1907 † accepted as Agalactochilus leobersdorfensis (Troll, 1907) †
- Species Helix leonardi Tapparone Canefri, 1886 accepted as Papuina antiqua leonardi (Tapparone Canefri, 1886)
- Species Helix leonina R. T. Lowe, 1852 accepted as Leptaxis groviana leonina (R. T. Lowe, 1852)
- Species Helix lepida Reuss, 1849 † accepted as Vallonia lepida (Reuss, 1849) †
- Species Helix lepida Poey, 1853 accepted as Hemitrochus lucipeta (Poey, 1854)
- Species Helix lepidolena Mabille, 1881 accepted as Caucasocressa dasilepida (Mabille, 1881)
- Species Helix lepidostola Heude, 1882 accepted as Ganesella lepidostola (Heude, 1882)
- Species Helix lepidotricha A. Braun, 1851 † accepted as Tropidomphalus arnoldii (Thomä, 1845) †
- Species Helix leporina A. Gould, 1848 accepted as Daedalochila leporina (A. Gould, 1848)
- Species Helix leprieurii Petit de la Saussaye, 1840 accepted as Labyrinthus leprieurii (Petit de la Saussaye, 1840)
- Species Helix leprosa Heude, 1885 accepted as Helix leprosula Heude, 1885
- Species Helix leprosa Shuttleworth, 1852 accepted as Canariella leprosa (Shuttleworth, 1852)
- Species Helix leprosula Heude, 1885 accepted as Coccoglypta leprosula (Heude, 1885)
- Species Helix leptogramma L. Pfeiffer, 1846 accepted as Quistrachia leptogramma (L. Pfeiffer, 1846)
- Species Helix leptoloma F. Sandberger, 1858 † accepted as Leucochroopsis leptoloma (F. Sandberger, 1858) †
- Species Helix leptostyla Dohrn, 1869 accepted as Leptaxis bollei (Albers, 1854)
- Species Helix leroii Landrin, 1865
- Species Helix lesiniaca Fagot, 1884
- Species Helix lespiaultii Noulet, 1854 †
- Species Helix lessoni L. Pfeiffer, 1846 accepted as Figuladra lessoni (L. Pfeiffer, 1846)
- Species Helix letranensis L. Pfeiffer, 1857
- Species Helix leucas Linnaeus, 1758
- Species Helix leucocheilus J. C. Cox, 1868 accepted as Ventopelita leucocheilus (J. C. Cox, 1868)
- Species Helix leucodon L. Pfeiffer, 1847 accepted as Labyrinthus leucodon leucodon (L. Pfeiffer, 1847)
- Species Helix leucolena Crosse, 1867 accepted as Torresitrachia torresiana (Hombron & Jacquinot, 1841)
- Species Helix leucophaea G. B. Sowerby I, 1841 accepted as Helicostyla leucophaea (G. B. Sowerby I, 1841)
- Species Helix leucophthalma L. Pfeiffer, 1870 accepted as Crystallopsis leucophthalma (L. Pfeiffer, 1870)
- Species Helix leucorhaphe L. Pfeiffer, 1853 accepted as Taenioraphe leucorhaphe (L. Pfeiffer, 1853)
- Species Helix leucosticta E. von Martens, 1889 accepted as Lejeania leucosticta (E. von Martens, 1889)
- Species Helix leucostoma A. Adams & Reeve, 1850
- Species Helix leucostyla L. Pfeiffer, 1855 accepted as Pachystyla inversicolor (A. Férussac, 1822)
- Species Helix leucothoe L. Pfeiffer, 1861 accepted as Papuina leucothoe (L. Pfeiffer, 1861)
- Species Helix leucotropis L. Pfeiffer, 1861 accepted as Dendrotrochus leucotropis (L. Pfeiffer, 1861)
- Species Helix leucozona C. Pfeiffer, 1828 accepted as Edentiella (Filicinella) leucozona (C. Pfeiffer, 1828)
- Species Helix levettei
- Species Helix levicula W. H. Benson, 1859 accepted as Durgella levicula (W. H. Benson, 1859)
- Species Helix levis L. Pfeiffer, 1845 accepted as Xerarionta levis (L. Pfeiffer, 1845)
- Species Helix leymerieana Noulet, 1854 † accepted as Megalotachea turonensis (Deshayes, 1832) †
- Species Helix leytensis L. Pfeiffer, 1846 accepted as Leytia leytensis (L. Pfeiffer, 1846)
- Species Helix libata Reeve, 1851 accepted as Calocochlea libata (Reeve, 1851)
- Species Helix liberiae A. D. Brown, 1865 accepted as Holkeion anceps (A. Gould, 1843)
- Species Helix lichnorum A. d'Orbigny, 1835 accepted as Bostryx lichnorum (A. d'Orbigny, 1835)
- Species Helix licodiensis Cafici, 1884
- Species Helix liebetruti Albers, 1852 accepted as Trochoidea liebetruti (Albers, 1852)
- Species Helix lienardiana Crosse, 1864 accepted as Papuina lienardiana (Crosse, 1864)
- Species Helix lifouana Marie, 1867 accepted as Helix lifuana Montrouzier, 1860
- Species Helix lifuana Montrouzier, 1860 accepted as Monomphalus lifuanus (Montrouzier, 1860)
- Species Helix ligata O. F. Müller, 1774
- Species Helix ligera Say, 1821 accepted as Ventridens ligera (Say, 1821)
- Species Helix lightfootiana L. Pfeiffer, 1854 accepted as Helix odontina Morelet, 1851
- Species Helix lignaria L. Pfeiffer, 1847 accepted as Calocochlea lignaria (L. Pfeiffer, 1847)
- Species Helix ligulata A. Férussac, 1821 accepted as Cryptozona ligulata (A. Férussac, 1821)
- Species Helix liliacea A. Férussac, 1832 accepted as Mesembrinus liliaceus (A. Férussac, 1832)
- Species Helix lima A. Férussac, 1821 accepted as Granodomus lima (A. Férussac, 1821)
- Species Helix limacina von Alten, 1812 accepted as Eucobresia diaphana (Draparnaud, 1805)
- Species Helix limacoides von Alten, 1812 accepted as Vitrina pellucida (O. F. Müller, 1774)
- Species Helix limansauensis (C. Semper, 1877) accepted as Chloraea limansauensis (C. Semper, 1877)
- Species Helix limatula Locard, 1899 accepted as Backeljaia gigaxii (L. Pfeiffer, 1847)
- Species Helix limatulus A. Binney, 1840 accepted as Zonitoides limatulus (A. Binney, 1840)
- Species Helix limbata Draparnaud, 1805 accepted as Hygromia limbata (Draparnaud, 1805)
- Species Helix limbata Da Costa, 1778 accepted as Planorbis planorbis (Linnaeus, 1758)
- Species Helix limegia Mabille, 1883
- Species Helix liminifera Held, 1836 accepted as Edentiella edentula (Draparnaud, 1805)
- Species Helix limitaris G. M. Dawson, 1875 accepted as Oreohelix subrudis limitaris (G. M. Dawson, 1875)
- Species Helix limnoides A. Férussac, 1832 accepted as Bulimulus limnoides (A. Férussac, 1832)
- Species Helix limonoica A. d'Orbigny, 1835 accepted as Bostryx limonoicus (A. d'Orbigny, 1835)
- Species Helix limosa Linnaeus, 1758 accepted as Ampullaceana balthica (Linnaeus, 1758)
- Species Helix lindoni L. Pfeiffer, 1847 accepted as Coryda lindoni (L. Pfeiffer, 1847)
- Species Helix lindstedti L. Pfeiffer, 1857 accepted as Dyakia lindstedti (L. Pfeiffer, 1857)
- Species Helix lineata Say, 1817 accepted as Helicodiscus parallelus (Say, 1821)
- Species Helix lineata Spix, 1827 accepted as Pomacea lineata (Spix, 1827)
- Species Helix lineata Olivi, 1792 accepted as Cernuella virgata (Da Costa, 1778)
- Species Helix lineata J. E. Gray, 1828 accepted as Tarebia granifera (Lamarck, 1816)
- Species Helix linguifera A. Férussac, 1821 accepted as Patera appressa (Say, 1821)
- Species Helix lingulata Deshayes, 1839 accepted as Polygyra lingulata (Deshayes, 1839)
- Species Helix linnaeana L. Pfeiffer, 1845
- Species Helix linophora Morelet, 1860 accepted as Harmogenanina linophora (Morelet, 1860)
- Species Helix linostoma A. d'Orbigny, 1835 accepted as Drymaeus linostoma (A. d'Orbigny, 1835)
- Species Helix linterae Möllendorff, 1897 accepted as Letitia secans (Hedley, 1894)
- Species Helix linusae Calcara, 1846 accepted as Eobania vermiculata (O. F. Müller, 1774)
- Species Helix lirata J. C. Cox, 1864 accepted as Decoriropa lirata (J. C. Cox, 1864)
- Species Helix liratula L. Pfeiffer, 1860 accepted as Philalanka liratula (L. Pfeiffer, 1860)
- Species Helix lisbonensis L. Pfeiffer, 1846 accepted as Ponentina ponentina (Morelet, 1845)
- Species Helix lischkeana Kobelt, 1879
- Species Helix listeri Broderip, 1841
- Species Helix listeri (J. E. Gray, 1825) accepted as Obba listeri (J. E. Gray, 1825)
- Species Helix listeri Röding, 1798 accepted as Columna columna (O. F. Müller, 1774)
- Species Helix lita Quoy & Gaimard, 1825 accepted as Drymaeus papyraceus (Mawe, 1823)
- Species Helix lithida Mabille, 1884
- Species Helix lithina Heude, 1885 accepted as Plectotropis lithina (Heude, 1885)
- Species Helix lithoica A. d'Orbigny, 1835 accepted as Bocourtia lithoica (A. d'Orbigny, 1835)
- Species Helix lithophaga Conrad, 1852 accepted as Levantina lithophaga (Conrad, 1852)
- Species Helix littorina Delle Chiaje, 1828 accepted as Paludinella littorina (Delle Chiaje, 1828)
- Species Helix littorinella Mabille, 1883 accepted as Domunculifex littorinella (Mabille, 1883)
- Species Helix liturata L. Pfeiffer, 1853 accepted as Iberus lituratus (L. Pfeiffer, 1853)
- Species Helix lituus R. P. Lesson, 1831 accepted as Papuina lituus (R. P. Lesson, 1831)
- Species Helix livesayi L. Pfeiffer, 1860 accepted as Obba livesayi (L. Pfeiffer, 1860)
- Species Helix lizardensis L. Pfeiffer, 1863 accepted as Theskelomensor lizardensis (L. Pfeiffer, 1863)
- Species Helix locardi Falsan & Locard, 1879 † accepted as Mesodontopsis locardi (Falsan & Locard, 1879) †
- Species Helix locardi Germain, 1912 † accepted as Helix locardiana Fagot, 1879 †
- Species Helix locardiana Fagot, 1879 † accepted as Trochulus hispidus (Linnaeus, 1758)
- Species Helix loehrii Gabb, 1868 accepted as Greggelix loehrii (Gabb, 1868)
- Species Helix lombardeaui Marie, 1867 accepted as Plesiopsis lombardoi (Souverbie, 1860)
- Species Helix lombardoi Souverbie, 1860
- Species Helix lombersensis Noulet, 1868 †
- Species Helix lomonti Brazier, 1876 accepted as Geodiscus lomonti (Brazier, 1876)
- Species Helix longipila Mousson, 1874
- Species Helix longsonensis Morlet, 1891 accepted as Camaena longsonensis (Morlet, 1891)
- Species Helix lophoica A. d'Orbigny, 1835 accepted as Drymaeus lophoicus (A. d'Orbigny, 1835)
- Species Helix lorata A. Férussac, 1825 accepted as Achatinella lorata (A. Férussac, 1825)
- Species Helix loricata A. Gould, 1846 accepted as Trilobopsis loricata loricata (A. Gould, 1846)
- Species Helix lorioliana Crosse, 1863 accepted as Cupedora lorioliana (Crosse, 1863)
- Species Helix lorquini L. Pfeiffer, 1865
- Species Helix lotophagorum Letourneux & Bourguignat, 1887 accepted as Sabessebia zitanica (Letourneux & Bourguignat, 1887)
- Species Helix lottah Petterd, 1879 accepted as Lottaropa lottah (Petterd, 1879)
- Species Helix louisiadensis Forbes, 1852 accepted as Rhynchotrochus louisiadensis (Forbes, 1852)
- Species Helix loveni Krauss, 1848 accepted as Chilocystis loveni (Krauss, 1848)
- Species Helix loweana Wollaston, 1878 accepted as Monilearia loweana (Wollaston, 1878)
- Species Helix lowei Potiez & Michaud, 1838 accepted as Microxeromagna lowei (Potiez & Michaud, 1838)
- Species Helix lowii A. Férussac, 1835 accepted as Pseudocampylaea lowii (A. Férussac, 1835)
- Species Helix loxana A. Schmidt, 1853 accepted as Iberus loxanus (A. Schmidt, 1853)
- Species Helix loxodon L. Pfeiffer, 1850 accepted as Plagioptycha loxodon (L. Pfeiffer, 1850)
- Species Helix loxotata Mabille, 1887 accepted as Moellendorffia loxotata (Mabille, 1887)
- Species Helix loxotropis L. Pfeiffer, 1850 accepted as Planispira loxotropis (L. Pfeiffer, 1850)
- Species Helix lubomirskii Ślósarski, 1881 accepted as Plicuteria lubomirskii (Ślósarski, 1881)
- Species Helix lubrica O. F. Müller, 1774 accepted as Cochlicopa lubrica (O. F. Müller, 1774)
- Species Helix lubrica W. H. Benson, 1852 accepted as Tanychlamys lubrica (W. H. Benson, 1852)
- Species Helix lubricus O. F. Müller, 1774 accepted as Cochlicopa lubrica (O. F. Müller, 1774)
- Species Helix lucana O. F. Müller, 1774 accepted as Trigonephrus lucanus (O. F. Müller, 1774)
- Species Helix lucana Westerlund, 1889 accepted as Marmorana fuscolabiata tenetensis (Kobelt, 1904)
- Species Helix lucani Tournouër, 1866 † accepted as Fridolinia lucani (Tournouër, 1866) †
- Species Helix lucasii Deshayes, 1850 accepted as Otala lucasii (Deshayes, 1850)
- Species Helix lucbardezensis Noulet, 1854 † accepted as Leucochroopsis lucbardezensis (Noulet, 1854) †
- Species Helix lucerna O. F. Müller, 1774 accepted as Lucerna lucerna (O. F. Müller, 1774)
- Species Helix luci Florence, 1884 accepted as Helicella stiparum (Rossmässler, 1854)
- Species Helix lucida Draparnaud, 1801 accepted as Oxychilus draparnaudi (H. Beck, 1837)
- Species Helix lucidella L. Pfeiffer, 1846 accepted as Lamprocystis lucidella (L. Pfeiffer, 1846)
- Species Helix lucifuga Rossmässler, 1835 accepted as Cepaea nemoralis etrusca (Rossmässler, 1835)
- Species Helix lucipeta Poey, 1854 accepted as Hemitrochus lucipeta (Poey, 1854)
- Species Helix luckmanii Brazier, 1877 accepted as Planilaoma luckmanii (Brazier, 1877)
- Species Helix lucorum Linnaeus, 1758
- Species Helix luctativa Mabille, 1889 accepted as Burmochloritis luctativa (Mabille, 1889)
- Species Helix lucubrata Say, 1829 accepted as Mesomphix lucubratus (Say, 1829)
- Species Helix ludersi L. Pfeiffer, 1855 accepted as Trochomorpha ludersi (L. Pfeiffer, 1855)
- Species Helix ludovici Noulet, 1854 † accepted as Mesodontopsis ludovici (Noulet, 1854) †
- Species Helix ludovici Albers, 1852 † accepted as Discula tectiformis ludovici (Albers, 1852) †
- Species Helix luedersi L. Pfeiffer, 1859 accepted as Helix ludersi L. Pfeiffer, 1855
- Species Helix luganensis Strobel, 1852
- Species Helix lugubris A. Férussac, 1821
- Species Helix lugubris Gmelin, 1791
- Species Helix lugubris A. Férussac, 1825 accepted as Achatinella (Achatinella) apexfulva (Dixon, 1789)
- Species Helix luhuana G. B. Sowerby I, 1839 accepted as Mandarina luhuana (G. B. Sowerby I, 1839)
- Species Helix luna Michaud, 1837 † accepted as Phacozonites luna (Michaud, 1837) †
- Species Helix lunula Thomä, 1845 † accepted as Discus lunula (Thomä, 1845) †
- Species Helix lunulata Krynicki, 1833 accepted as Helicopsis lunulata (Krynicki, 1833)
- Species Helix luquillensis Shuttleworth, 1854 accepted as Polydontes luquillensis (Shuttleworth, 1854)
- Species Helix lurida C. Pfeiffer, 1828 accepted as Edentiella lurida (C. Pfeiffer, 1828)
- Species Helix lurida A. Gould, 1846 accepted as Orpiella (Irenella) pfeifferi (R. A. Philippi, 1845)
- Species Helix luseana Paiva, 1866
- Species Helix lusitanica L. Pfeiffer, 1841 accepted as Oestophora lusitanica (L. Pfeiffer, 1841)
- Species Helix lutacea L. Pfeiffer, 1857
- Species Helix lutaria Linnaeus, 1758
- Species Helix lutea L. Pfeiffer, 1876 accepted as Calocochlea roissyana lutea (L. Pfeiffer, 1876)
- Species Helix lutea Montagu, 1803 accepted as Ampullaceana balthica (Linnaeus, 1758)
- Species Helix lutea E. von Martens, 1864
- Species Helix luteata L. Pfeiffer, 1857 accepted as Cernuella virgata (Da Costa, 1778)
- Species Helix luteocornea Reeve, 1854 accepted as Trochomorpha luteocornea (Reeve, 1854)
- Species Helix luteofasciata I. Lea, 1840 accepted as Hemitrichia (Atrichoconcha) luteofasciata (I. Lea, 1840)
- Species Helix luteofusca J. C. Cox, 1868 accepted as Cupedora luteofusca (J. C. Cox, 1868)
- Species Helix luteola Servain, 1880
- Species Helix luteola A. Férussac, 1825 accepted as Amastra luteola (A. Férussac, 1825)
- Species Helix luteolina Gassies, 1863 accepted as Ptychorhytida aulacospira (L. Pfeiffer, 1846)
- Species Helix lutescens Rossmässler, 1837
- Species Helix lutetiana Bourguignat, 1869 † accepted as Edentiella edentula (Draparnaud, 1805)
- Species Helix lutulenta Locard, 1899 accepted as Cernuella virgata (Da Costa, 1778)
- Species Helix lutuosa Deshayes, 1874
- Species Helix luynesiana Bourguignat, 1876 accepted as Helix pachya Bourguignat, 1860
- Species Helix luzi L. Pfeiffer, 1866
- Species Helix luzonica Reeve, 1842 accepted as Calocochlea pulcherrima (G. B. Sowerby I, 1841)
- Species Helix lychna Mabille, 1884 accepted as Ampelita madagascariensis (Lamarck, 1816)
- Species Helix lychnia W. H. Benson, 1852 accepted as Eurybasis lychnia (W. H. Benson, 1852)
- Species Helix lychnuchus O. F. Müller, 1774 accepted as Pleurodonte lychnuchus (O. F. Müller, 1774)
- Species Helix lyndhurstensis J. C. Cox, 1868 accepted as Zonitoides arboreus (Say, 1817)
- Species Helix lyndi Angas, 1872 accepted as Xanthomelon durvillii (Hombron & Jacquinot, 1841)
- Species Helix lyonetiana Pallas, 1774 accepted as Gibbus lyonetianus (Pallas, 1780)
- Species Helix lyrata A. Gould, 1846 accepted as Stephadiscus lyratus (A. Gould, 1846)
- Species Helix maackii Gerstfeldt, 1859 accepted as Karaftohelix maackii (Gerstfeldt, 1859)
- Species Helix mabillei Crosse, 1864 accepted as Sauroconcha corneovirens (L. Pfeiffer, 1851)
- Species Helix Mac andrewiana L. Pfeiffer, 1853 accepted as Theba macandrewiana (L. Pfeiffer, 1853)
- Species Helix macgillivrayi Forbes, 1852 accepted as Rhynchotrochus macgillivrayi (Forbes, 1852)
- Species Helix macgregori J. C. Cox, 1870 accepted as Coxia macgregori (J. C. Cox, 1870)
- Species Helix mackensiana Souleyet, 1841 accepted as Dyakia mackensiana (Souleyet, 1841)
- Species Helix mackensii A. Adams & Reeve, 1850 accepted as Plectotropis mackensii (A. Adams & Reeve, 1850)
- Species Helix macleayi J. C. Cox, 1865 accepted as Bentosites macleayi (J. C. Cox, 1865)
- Species Helix macmurrayi C. B. Adams, 1849 accepted as Zaphysema macmurrayi (C. B. Adams, 1849)
- Species Helix macnabiana Reeve, 1854 accepted as Aerotrochus mcnabianus (Chitty, 1853)
- Species Helix macneili Crosse, 1873 accepted as Averellia macneili (Crosse, 1873)
- Species Helix macquariensis J. C. Cox, 1872 accepted as Montidelos macquariensis (J. C. Cox, 1872)
- Species Helix macrocheila Reuss, 1849 † accepted as Megalotachea macrocheila (Reuss, 1849) †
- Species Helix macrocycloides Kobelt, 1879
- Species Helix macroglossa L. Pfeiffer, 1866 accepted as Plagioptycha macroglossa (L. Pfeiffer, 1866)
- Species Helix macropleuris W. H. Benson, 1859 accepted as Rahula macropleuris (W. H. Benson, 1859)
- Species Helix macrostoma Rossmässler, 1837 accepted as Campylaea macrostoma (Rossmässler, 1837)
- Species Helix maculata Born, 1778 accepted as Stenomelania macilenta (Menke, 1830)
- Species Helix maculata Anton, 1838
- Species Helix maculifera Poey, 1858 accepted as Hemitrochus maculifera (Poey, 1858)
- Species Helix madagascariensis Lamarck, 1816 accepted as Ampelita madagascariensis (Lamarck, 1816)
- Species Helix madecassina A. Férussac, 1822 accepted as Ampelita madecassina (A. Férussac, 1822)
- Species Helix madeirensis W. Wood, 1828 accepted as Disculella madeirensis (W. Wood, 1828)
- Species Helix madera Mabille, 1884
- Species Helix maderaspatana J. E. Gray, 1834 accepted as Ariophanta maderaspatana (J. E. Gray, 1834)
- Species Helix madritensis Rambur, 1868 accepted as Xerotricha madritensis (Rambur, 1868)
- Species Helix maeotica Steklov, 1966 †
- Species Helix maforensis Tapparone Canefri, 1886 accepted as Chloritis maforensis (Tapparone Canefri, 1886)
- Species Helix magister Reeve, 1853 accepted as Helix magistra L. Pfeiffer, 1852
- Species Helix magistra L. Pfeiffer, 1852 accepted as Anixa magistra (L. Pfeiffer, 1852)
- Species Helix magnaciana Heude, 1882 accepted as Bradybaena magnaciana (Heude, 1882)
- Species Helix magnifica I. Lea, 1838 accepted as Solaropsis gibboni (L. Pfeiffer, 1846)
- Species Helix magnifica A. Férussac, 1819 accepted as Helicophanta magnifica (A. Férussac, 1819)
- Species Helix magnilabiata Sacco, 1884 † accepted as Schlickumia bottinii (Sacco, 1884) †
- Species Helix magnini Locard, 1883 † accepted as Megalotachea delphinensis (Fontannes, 1876) †
- Species Helix maguntina Deshayes, 1832 † accepted as Palaeotachea maguntina (Deshayes, 1832) †
- Species Helix mahometana Bourguignat, 1860 accepted as Helix lucorum Linnaeus, 1758
- Species Helix maillardi Deshayes, 1863 accepted as Dupontia maillardi (Deshayes, 1863)
- Species Helix maino Brazier, 1876 accepted as Durgellina maino (Brazier, 1876)
- Species Helix major A. Binney, 1837 accepted as Neohelix major (A. Binney, 1837)
- Species Helix majoricensis Dohrn & Heynemann, 1862 accepted as Xerocrassa newka (Dohrn & Heynemann, 1862)
- Species Helix majuscula L. Pfeiffer, 1857 accepted as Discoconcha majuscula (L. Pfeiffer, 1857)
- Species Helix malacanus Reeve, 1854 accepted as Macrochlamys malaccana (L. Pfeiffer, 1855)
- Species Helix malaccana L. Pfeiffer, 1855 accepted as Tanychlamys malaccana (L. Pfeiffer, 1855)
- Species Helix malantensis A. Adams & Angas, 1876 accepted as Papuina malantensis (A. Adams & Angas, 1876)
- Species Helix malbatensis Hidalgo, 1890 accepted as Chloritis malbatensis (Hidalgo, 1890)
- Species Helix malleata A. Férussac, 1821
- Species Helix malleolata F. Sandberger, 1875 † accepted as Palaeotachea silvana (Klein, 1853) †
- Species Helix malleolata Westerlund, 1898 accepted as Metafruticicola redtenbacheri (L. Pfeiffer, 1856)
- Species Helix malziana L. Pfeiffer, 1861 accepted as Levantina malziana (L. Pfeiffer, 1861)
- Species Helix mamilla I. Lea, 1834 accepted as Coryda alauda (A. Férussac, 1821)
- Species Helix mamilla A. Férussac, 1821 accepted as Pseudobba mamilla (A. Férussac, 1821)
- Species Helix manca Klika, 1891 † accepted as Monacha (Monacha) waerzenensis (Klika, 1891) †
- Species Helix mandarina G. B. Sowerby I, 1839 accepted as Mandarina mandarina (G. B. Sowerby I, 1839)
- Species Helix mandoni Mabille, 1883 accepted as Leptaxis groviana (A. Férussac, 1832)
- Species Helix manilla [sic] accepted as Helix mamilla I. Lea, 1834
- Species Helix manriquiana R. T. Lowe, 1861
- Species Helix mansueta Reeve, 1854 accepted as Moretonistes mansueta (Reeve, 1854)
- Species Helix manueli (E. T. Higgins, 1872) accepted as Labyrinthus manueli E. T. Higgins, 1872
- Species Helix marcescens J. C. Cox, 1868 accepted as Galadistes marcescens (J. C. Cox, 1868)
- Species Helix marceti Fagot, 1906 accepted as Xerotricha barcinensis (Bourguignat, 1868)
- Species Helix marchionissa Hombron & Jacquinot, 1848
- Species Helix marcida W. H. Benson, 1853 accepted as Euplecta partita (Reeve, 1854)
- Species Helix marcida Shuttleworth, 1852
- Species Helix maresi Crosse, 1862 accepted as Helix tigri P. Fischer, 1857
- Species Helix margarita Montagu, 1808 accepted as Margarites helicinus (Phipps, 1774)
- Species Helix margarita L. Pfeiffer, 1845 accepted as Proserpinula infortunata (Bland, 1854)
- Species Helix margarita Hombron & Jacquinot, 1848
- Species Helix margaritacea A. Schmidt, 1852 accepted as Oxychilus cellarius (O. F. Müller, 1774)
- Species Helix margaritis L. Pfeiffer, 1850 accepted as Planispira margaritis (L. Pfeiffer, 1850)
- Species Helix marginata O. F. Müller, 1774 accepted as Obba marginata (O. F. Müller, 1774)
- Species Helix marginella Gmelin, 1791 accepted as Caracolus marginella (Gmelin, 1791)
- Species Helix mariae J. C. Cox, 1865 accepted as Ventopelita leucocheilus (J. C. Cox, 1868)
- Species Helix mariciei Cousin, 1887 accepted as Isomeria triodonta (A. d'Orbigny, 1835)
- Species Helix mariei Crosse, 1867 accepted as Diplomphalus mariei (Crosse, 1867)
- Species Helix mariella H. Adams, 1870 accepted as Pseudiberus mariella (H. Adams, 1870)
- Species Helix marioni Matheron, 1879 † accepted as Palaeoxestina marioni (Matheron, 1879) †
- Species Helix maristorum Florence, 1884 accepted as Helicella (Xeromagna) terverii (Michaud, 1831)
- Species Helix marmarina A. d'Orbigny, 1835 accepted as Drymaeus marmarinus (A. d'Orbigny, 1835)
- Species Helix marmatensis Reeve, 1854 accepted as Solaropsis marmatensis (Reeve, 1854)
- Species Helix marmorata J. C. Cox, 1864 accepted as Nitor circumcinctus (J. C. Cox, 1868)
- Species Helix marmorata L. Pfeiffer, 1849 accepted as Trochomorpha approximata (Le Guillou, 1842)
- Species Helix marmorata A. Férussac, 1821 accepted as Iberus marmoratus (A. Férussac, 1821)
- Species Helix marmorella L. Pfeiffer, 1846 accepted as Amphidoxa marmorella (L. Pfeiffer, 1846)
- Species Helix marmorivaga Mabille, 1889 accepted as Camaena marmorivaga (Mabille, 1889)
- Species Helix marmorosa Hombron & Jacquinot, 1847 accepted as Trochomorpha approximata (Le Guillou, 1842)
- Species Helix maroccana Morelet, 1876 accepted as Oestophora maroccana (Morelet, 1876)
- Species Helix marrucina Tiberi, 1878 accepted as Marmorana signata recondita (Westerlund, 1876)
- Species Helix martensi L. Pfeiffer, 1861 accepted as Chloritis martensi (L. Pfeiffer, 1861)
- Species Helix martensiana Tiberi, 1869 accepted as Monacha martensiana (Tiberi, 1869)
- Species Helix martigena A. Férussac, 1832 accepted as Ponentina martigena (A. Férussac, 1832)
- Species Helix martinezi Hidalgo, 1869 accepted as Euconulus martinezi (Hidalgo, 1869)
- Species Helix martini Reeve, 1854 accepted as Dyakia martini (Reeve, 1854)
- Species Helix martiniana L. Pfeiffer, 1845 accepted as Dentellaria peracutissima (C. B. Adams, 1845)
- Species Helix martinii Bernardi, 1858 accepted as Isomeria morula (Hidalgo, 1870)
- Species Helix martorelli Bourguignat, 1870 accepted as Montserratina martorelli (Bourguignat, 1870)
- Species Helix masadae Tristram, 1865 accepted as Levantina lithophaga (Conrad, 1852)
- Species Helix mascarenasi Fagot, 1888 accepted as Xerotricha barcinensis (Bourguignat, 1868)
- Species Helix massiei Morlet, 1891 accepted as Burmochloritis massiei (Morlet, 1891)
- Species Helix massiliensis Matheron, 1843 † accepted as Canariella massiliensis (Matheron, 1843) †
- Species Helix massoni L. Pfeiffer, 1859
- Species Helix massylaea Morelet, 1851 accepted as Massylaea massylaea (Morelet, 1851)
- Species Helix mastersi J. C. Cox, 1864 accepted as Pommerhelix mastersi (J. C. Cox, 1864)
- Species Helix mathildae Westerlund, 1881 accepted as Hiltrudia mathildae (Westerlund, 1881)
- Species Helix mathinnae Petterd, 1879 accepted as Protractiropa mathinnae (Petterd, 1879)
- Species Helix mathiusii A. d'Orbigny, 1835 accepted as Megalobulimus leucostoma (G. B. Sowerby I, 1835)
- Species Helix matruelis G. B. Sowerby I, 1841 accepted as Calocochlea matruelis (G. B. Sowerby I, 1841)
- Species Helix mattiaca Steininger, 1835 † accepted as Agalactochilus mattiacus (Steininger, 1835) †
- Species Helix matura L. Pfeiffer, 1855 accepted as Trochomorpha matura (L. Pfeiffer, 1855)
- Species Helix maugeana Shuttleworth, 1852 accepted as Hemicycla maugeana (Shuttleworth, 1852)
- Species Helix maupiniana Deshayes, 1870 accepted as Helix moupiniana Deshayes, 1870
- Species Helix mauritiana L. Pfeiffer, 1854 accepted as Helix mauritianella Morelet, 1851
- Species Helix mauritianella Morelet, 1851 accepted as Pachystyla bicolor var. mauritianella (Morelet, 1851)
- Species Helix mauritii Jousseaume, 1887 accepted as Isomeria triodonta (A. d'Orbigny, 1835)
- Species Helix maurolyci Benoit, 1843
- Species Helix maxillata A. Gould, 1848 accepted as Stenotrema maxillatum (A. Gould, 1848)
- Species Helix maxima Reeve, 1853 accepted as Pararyssota maxima (Reeve, 1853)
- Species Helix maximiliana "A. Férussac" accepted as Auris bilabiata (Broderip & G. B. Sowerby I, 1830)
- Species Helix mayrani Gassies, 1856 accepted as Albea mayrani (Gassies, 1856)
- Species Helix mazatlanica L. Pfeiffer, 1856 accepted as Paralaoma mazatlanica (L. Pfeiffer, 1856)
- Species Helix mazee Brazier, 1878 accepted as Steorra mazee (Brazier, 1878)
- Species Helix mazzinincola De Gregorio, 1892 † accepted as Prothelidomus mazzinincola (De Gregorio, 1892) †
- Species Helix mazzullii De Cristofori & Jan, 1832 accepted as Cornu mazzullii (De Cristofori & Jan, 1832)
- Species Helix mazzulopsis Pilsbry, 1893 accepted as Cantareus subapertus (Ancey, 1893)
- Species Helix mcnabiana Chitty, 1853 accepted as Aerotrochus mcnabianus (Chitty, 1853)
- Species Helix meda Porro, 1840 accepted as Xerocrassa meda (Porro, 1840)
- Species Helix mediocris Reeve, 1854 accepted as Happiella mediocris (Reeve, 1854)
- Species Helix meditata Tapparone Canefri, 1883 accepted as Canefriula sicula (Brazier, 1876)
- Species Helix megei Lambert, 1873 accepted as Pseudomphalus megei (Lambert, 1873)
- Species Helix melaleucarum Gassies, 1872 accepted as Andrefrancia melaleucarum (Gassies, 1872)
- Species Helix melania Cafici, 1884
- Species Helix melanocheilos Grateloup, 1840 accepted as Calocochlea melanocheila (Grateloup, 1840)
- Species Helix melanocheylos Grateloup, 1840 accepted as Calocochlea melanocheila (Grateloup, 1840)
- Species Helix melanonixia Bourguignat, 1876 accepted as Helix melanostoma Draparnaud, 1801
- Species Helix melanostoma Draparnaud, 1801
- Species Helix melanotragus Born, 1778 accepted as Acavus haemastoma (Linnaeus, 1758)
- Species Helix melanotrica Mabille, 1888 accepted as Camaena melanotrica (Mabille, 1888)
- Species Helix melbournensis J. C. Cox, 1868 accepted as Excellaoma melbournensis (J. C. Cox, 1868)
- Species Helix meleagris L. Pfeiffer, 1855 accepted as Trochomorpha meleagris (L. Pfeiffer, 1855)
- Species Helix melillensis Pallary, 1899
- Species Helix melissophaga O. Costa, 1836
- Species Helix melitae Gassies, 1870 accepted as Andrefrancia rusticula (Gassies, 1859)
- Species Helix mellea L. Pfeiffer, 1866 accepted as Satsuma mellea (L. Pfeiffer, 1866)
- Species Helix mellita Heude, 1886
- Species Helix mellitula Heude, 1886
- Species Helix melo Quoy & Gaimard, 1832 accepted as Bothriembryon melo (Quoy & Gaimard, 1832)
- Species Helix melolontha Shuttleworth, 1852
- Species Helix melones A. Férussac, 1821 accepted as Bothriembryon melo (Quoy & Gaimard, 1832)
- Species Helix melvilliana Ancey, 1892 accepted as Sculptaria damarensis (H. Adams, 1870)
- Species Helix membranacea W. H. Benson, 1853 accepted as Satiella membranacea (W. H. Benson, 1853)
- Species Helix membranicosta Reeve, 1854 accepted as Trochomorpha membranicosta (Reeve, 1854)
- Species Helix menardi Brongniart, 1810 † accepted as Strobilops menardi (Brongniart, 1810) †
- Species Helix mendanae J. C. Cox, 1873
- Species Helix mendax E. von Martens, 1864 accepted as Parachloritis mendax (E. von Martens, 1864)
- Species Helix mendesi Roman, 1907 †
- Species Helix mendica Pollonera, 1892 accepted as Cernuella neglecta (Draparnaud, 1805)
- Species Helix mendicaria L. Pfeiffer, 1860 accepted as Schileykiella sordulenta (Morelet, 1851)
- Species Helix mendicula Paladilhe, 1874 † accepted as Xerophila mendicula (Paladilhe, 1874) †
- Species Helix mendranoi Servain, 1880 accepted as Cernuella virgata (Da Costa, 1778)
- Species Helix meneghiniana Vinassa de Regny, 1897 † accepted as Galactochiloides meneghiniana (Vinassa de Regny, 1897) †
- Species Helix meninxica Letourneux & Bourguignat, 1887 accepted as Sabessebia zitanica (Letourneux & Bourguignat, 1887)
- Species Helix menkeana L. Pfeiffer, 1842 accepted as Phortion menkeanum (L. Pfeiffer, 1842)
- Species Helix mensalis Heude, 1888
- Species Helix meobambensis L. Pfeiffer, 1857 accepted as Isomeria meobambensis (L. Pfeiffer, 1857)
- Species Helix merarcha Mabille, 1888 accepted as Neocepolis merarcha (Mabille, 1888)
- Species Helix mercatoria L. Pfeiffer, 1845 accepted as Satsuma mercatoria (L. Pfeiffer, 1845)
- Species Helix mercatorina Mabille, 1887 accepted as Neocepolis morleti (Dautzenberg & d'Hamonville, 1887)
- Species Helix meretrix G. B. Sowerby I, 1841
- Species Helix merguiensis R. A. Philippi, 1847 accepted as Planispira gabata (A. Gould, 1843)
- Species Helix meridionalis Mousson, 1854
- Species Helix meridionalis W. Wood, 1828 accepted as Ryssota otaheitana (A. Férussac, 1821)
- Species Helix mermieri Locard, 1890 † accepted as Edentiella edentula (Draparnaud, 1805)
- Species Helix mersispira E. von Martens, 1864 accepted as Cristigibba mersispira (E. von Martens, 1864)
- Species Helix merziana L. Pfeiffer, 1853 accepted as Trochomorpha merziana (L. Pfeiffer, 1853)
- Species Helix merzianoides Garrett, 1874 accepted as Trochomorpha merzianoides (Garrett, 1874)
- Species Helix mesembrica Letourneux & Bourguignat, 1887 accepted as Sabessebia zitanica (Letourneux & Bourguignat, 1887)
- Species Helix mesoleuca E. von Martens, 1882 accepted as Leucozonella mesoleuca (E. von Martens, 1882)
- Species Helix mesomphalos Morelet, 1860 accepted as Epiphragmophora claromphalos mesomphalos (Morelet, 1860)
- Species Helix mesopotamica Mousson, 1874 accepted as Xeropicta mesopotamica (Mousson, 1874)
- Species Helix mespillum Megerle von Mühlfeld, 1824 accepted as Echinolittorina mespillum (Megerle von Mühlfeld, 1824)
- Species Helix mesquiniana Pallary, 1898
- Variety Helix mesquiniana var. dentata Pallary, 1898
- Species Helix meta L. Pfeiffer, 1856 accepted as Papuina meta (L. Pfeiffer, 1856)
- Species Helix metaformis A. Férussac, 1821 accepted as Orthostylus metaformis (A. Férussac, 1821)
- Species Helix metcalfii L. Pfeiffer, 1845 accepted as Videna metcalfii (L. Pfeiffer, 1845)
- Species Helix metula Crosse, 1870 accepted as Helix (Geotrochus) adonis Angas, 1870
- Species Helix mexicana L. Pfeiffer, 1842
- Species Helix meyeri Kobelt, 1894 accepted as Isomeria meyeri (Kobelt, 1894)
- Species Helix mezessarica Letourneux & Bourguignat, 1887 accepted as Sabessebia zitanica (Letourneux & Bourguignat, 1887)
- Species Helix miara Mabille, 1887 accepted as Trichochloritis miara (Mabille, 1887)
- Species Helix mica Morelet, 1879 accepted as Psichion mica (Morelet, 1879)
- Species Helix micacea Heude, 1882
- Species Helix micans L. Pfeiffer, 1845 accepted as Pfeifferia micans (L. Pfeiffer, 1845)
- Species Helix miccyla W. H. Benson, 1860 accepted as Pupisoma miccyla (W. H. Benson, 1860)
- Species Helix michaudi Deshayes, 1832 accepted as Lemniscia michaudi (Deshayes, 1832)
- Species Helix micheliniana Matheron, 1843 † accepted as Megalotachea turonensis (Deshayes, 1832) †
- Species Helix micida Locard, 1899 accepted as Candidula olisippensis (Servain, 1880)
- Species Helix micra Morelet, 1882 accepted as Euconulus crami Fischer-Piette, C. P. Blanc, F. Blanc & F. Salvat, 1994
- Species Helix microcosmos J. C. Cox, 1868 accepted as Iotula microcosmos (J. C. Cox, 1868)
- Species Helix microdonta Deshayes, 1832 accepted as Stylodonta unidentata (Holten, 1802)
- Species Helix micromphalus A. Letourneux, 1870
- Species Helix microphis Crosse, 1868 accepted as Microphyura microphis (Crosse, 1868)
- Species Helix micropleuros J. Paget, 1854 accepted as Paralaoma servilis (Shuttleworth, 1852)
- Species Helix microscopica Krauss, 1848 accepted as Trachycystis microscopica (Krauss, 1848)
- Species Helix microscopica J. C. Cox, 1864 accepted as Iotula microcosmos (J. C. Cox, 1868)
- Species Helix microsoma Morelet, 1883 accepted as Euconulus microsoma (Morelet, 1883)
- Species Helix microspira Reeve, 1854 accepted as Calocochlea microspira (Reeve, 1854)
- Species Helix microstigmaea Castro, 1887
- Species Helix microstoma Lamarck, 1822 accepted as Zachrysia microstoma (Lamarck, 1822)
- Species Helix microundulata Suter, 1890 accepted as Huonodon microundulatum (Suter, 1890)
- Species Helix microzaffarina Pallary, 1898
- Species Helix middendorffi Gerstfeldt, 1859 accepted as Karaftohelix middendorffi (Gerstfeldt, 1859)
- Species Helix mighelsiana L. Pfeiffer, 1847 accepted as Bradybaena mighelsiana (L. Pfeiffer, 1847)
- Species Helix migratoria L. Pfeiffer, 1855 accepted as Megalacron migratoria (L. Pfeiffer, 1855)
- Species Helix miguelina L. Pfeiffer, 1856 accepted as Oxychilus miguelinus (L. Pfeiffer, 1856)
- Species Helix mileti Kobelt, 1906
- Species Helix miliacea E. von Martens, 1867 accepted as Kaliella miliacea (E. von Martens, 1867)
- Species Helix miliaria Gredler, 1881
- Species Helix miliaris Morelet, 1888 accepted as Psichion mica (Morelet, 1879)
- Species Helix miliola A. d'Orbigny, 1835 accepted as Bahiensis miliolus (A. d'Orbigny, 1835)
- Species Helix militaris L. Pfeiffer, 1855 accepted as Stylodonta unidentata (Holten, 1802)
- Species Helix milium E. S. Morse, 1859 accepted as Striatura milium (E. S. Morse, 1859)
- Species Helix milium E. von Martens, 1864 accepted as Kaliella miliacea (E. von Martens, 1867)
- Species Helix milleri L. Pfeiffer, 1867 accepted as Hemitrochus milleri (L. Pfeiffer, 1867)
- Species Helix millestriata E. A. Smith, 1874 accepted as Dupucharopa millestriata (E. A. Smith, 1874)
- Species Helix millicentae J. C. Cox, 1871 accepted as Rhynchotrochus louisiadensis (Forbes, 1852)
- Species Helix millieri Bourguignat, 1880 accepted as Chilostoma millieri (Bourguignat, 1880)
- Species Helix mimicula Heude, 1888
- Species Helix mimosa Petterd, 1879 accepted as Kessneropa mimosa (Petterd, 1879)
- Species Helix mimosarum A. d'Orbigny, 1835
- Species Helix mina L. Pfeiffer, 1852
- Species Helix mindaiensis Bock, 1881 accepted as Dyakia mindaiensis (Bock, 1881)
- Species Helix mindana Reeve, 1842 accepted as Calocochlea mindanaensis (L. Pfeiffer, 1842)
- Species Helix mindanaensis L. Pfeiffer, 1842 accepted as Calocochlea mindanaensis (L. Pfeiffer, 1842)
- Species Helix minerva Reeve, 1853
- Species Helix mingrelica P. Hesse, 1918 accepted as Jasonella mingrelica (P. Hesse, 1918)
- Species Helix minima J. C. Cox, 1868 accepted as Laomavix collisi (Brazier, 1877)
- Species Helix minima True, 1857 accepted as Punctum minutissimum (I. Lea, 1841)
- Species Helix minnigerodei Strubell, 1895 accepted as Sulcobasis minnigerodei (Strubell, 1895)
- Species Helix minor C. B. Adams, 1851 accepted as Sagda minor (C. B. Adams, 1851)
- Species Helix minoricensis Mittre, 1842 accepted as Iberellus minoricensis (Mittre, 1842)
- Species Helix minuscula A. Binney, 1840 accepted as Hawaiia minuscula (A. Binney, 1841)
- Species Helix minuta Say, 1817 accepted as Vallonia pulchella (O. F. Müller, 1774)
- Species Helix minuta O. F. Müller, 1774 accepted as Truncatellina cylindrica (A. Férussac, 1807)
- Species Helix minutalis Morelet, 1851 accepted as Hawaiia minuscula (A. Binney, 1841)
- Species Helix minutella Mabille, 1889
- Species Helix minutialis Deshayes, 1851
- Species Helix minutissima I. Lea, 1841 accepted as Punctum minutissimum (I. Lea, 1841)
- Species Helix minutula Crosse, 1870 accepted as Rhytidopsis minutula (Crosse, 1870)
- Species Helix mirabilis A. Férussac, 1821 accepted as Helicostyla mirabilis (A. Férussac, 1821)
- Species Helix miraculensis Marcet, 1906 accepted as Xerocrassa penchinati (Bourguignat, 1868)
- Species Helix mirandae Rambur, 1868 accepted as Helix iberica Rambur, 1869
- Species Helix mirandae R. T. Lowe, 1861 accepted as Obelus mirandae (R. T. Lowe, 1861)
- Species Helix misella A. Férussac, 1821 accepted as Lamprocystis misella (A. Férussac, 1821)
- Species Helix miser J. C. Cox, 1873 accepted as Papuina meta (L. Pfeiffer, 1856)
- Species Helix mitchellae J. C. Cox, 1864 accepted as Thersites mitchellae (J. C. Cox, 1864)
- Species Helix mitchelliana I. Lea, 1838 accepted as Mesodon mitchellianus (I. Lea, 1838)
- Species Helix mitis L. Pfeiffer, 1863 accepted as Aenigmatoconcha mitis (L. Pfeiffer, 1863)
- Species Helix mixta Legrand, 1871 accepted as Mulathena fordei (Brazier, 1871)
- Species Helix mobiliana I. Lea, 1841 accepted as Praticolella mobiliana (I. Lea, 1841)
- Species Helix modesta L. Pfeiffer, 1848 accepted as Edentiella (Filicinella) leucozona leucozona (C. Pfeiffer, 1828)
- Species Helix modesta G. B. Sowerby I, 1841 accepted as Helicostyla modesta (G. B. Sowerby I, 1841)
- Species Helix modica Morelet, 1858 accepted as Cernuella cisalpina (Rossmässler, 1837)
- Species Helix modicella Deshayes, 1850 accepted as Sinployea modicella (Deshayes, 1850)
- Species Helix modiola A. Férussac, 1821 accepted as Gonospira modiola (A. Férussac, 1821)
- Species Helix moduloides Vinassa de Regny, 1896 † accepted as Dentellocaracolus (Prothelidomus) moduloides (Vinassa de Regny, 1896) †
- Species Helix moellendorffii Kobelt, 1871 accepted as Campylaeopsis moellendorffii (Kobelt, 1871)
- Species Helix moerchi L. Pfeiffer, 1851 accepted as Hemitrichiella moerchi (L. Pfeiffer, 1851)
- Species Helix moesta L. Pfeiffer, 1848
- Species Helix mograbina Morelet, 1852 accepted as Xeroleuca mograbina (Morelet, 1852)
- Species Helix moguntina [sic] † accepted as Palaeotachea maguntina (Deshayes, 1832) †
- Species Helix mohammedi Mabille, 1883
- Species Helix mola Heude, 1885 accepted as Trichochloritis mola (Heude, 1885)
- Species Helix molecula W. H. Benson, 1859 accepted as Tanychlamys molecula (W. H. Benson, 1859)
- Species Helix molina Heude, 1890 accepted as Trichochloritis molina (Heude, 1890)
- Species Helix molinae Hidalgo, 1883 accepted as Xerocrassa molinae (Hidalgo, 1883)
- Species Helix molliseta L. Pfeiffer, 1863 accepted as Chloritis molliseta (L. Pfeiffer, 1863)
- Species Helix moluccensis L. Pfeiffer, 1850 accepted as Planispira moluccensis (L. Pfeiffer, 1850)
- Species Helix monacha L. Pfeiffer, 1859 accepted as Pommerhelix monacha (L. Pfeiffer, 1859)
- Species Helix monacha Mabille, 1884 accepted as Ampelita lachesis (Deshayes, 1850)
- Species Helix monaecensis Rambur, 1868
- Species Helix monas Morelet, 1860 accepted as Spermodea monas (Morelet, 1860)
- Species Helix monerebia Mabille, 1880
- Species Helix mongolica Möllendorff, 1881 accepted as Cathaica mongolica (Möllendorff, 1881)
- Species Helix monile Broderip, 1832 accepted as Solaropsis monile (Broderip, 1832)
- Species Helix monilia Deshayes, 1863 † accepted as Strobilops monilia (Deshayes, 1863) †
- Species Helix monilifera P. B. Webb & S. Berthelot, 1833 accepted as Monilearia monilifera (P. B. Webb & S. Berthelot, 1833)
- Species Helix monistrolensis Fagot, 1884 accepted as Xerocrassa penchinati (Bourguignat, 1868)
- Species Helix moniziana Paiva, 1867 accepted as Craspedaria moniziana (Paiva, 1867)
- Species Helix monochroa G. B. Sowerby I, 1841 accepted as Mesanella monochroa (G. B. Sowerby I, 1841)
- Species Helix monodon A. Férussac, 1807 accepted as Petasina monodon (A. Férussac, 1807)
- Species Helix monodon Rackett, 1821 accepted as Euchemotrema leaii leaii (A. Binney, 1840)
- Species Helix monodonta I. Lea, 1834 accepted as Coryda monodonta (I. Lea, 1834)
- Species Helix monodonta Grateloup, 1840 accepted as Erepta stylodon (L. Pfeiffer, 1842)
- Species Helix monolacca L. Pfeiffer, 1857 accepted as Solaropsis monolacca (L. Pfeiffer, 1857)
- Species Helix monolifera [sic] accepted as Helix monilifera P. B. Webb & S. Berthelot, 1833
- Species Helix mononema W. H. Benson, 1853 accepted as Philalanka mononema (W. H. Benson, 1853)
- Species Helix monrovia Rang, 1831 accepted as Gonaxis monrovia (Rang, 1831)
- Species Helix monsdraconensis Noulet, 1868 †
- Species Helix montfortiana L. Pfeiffer, 1846 accepted as Anixa montfortiana (L. Pfeiffer, 1846)
- Species Helix monticula G. B. Sowerby I, 1841 accepted as Orustia monticula (G. B. Sowerby I, 1841)
- Species Helix montivaga Fagot, 1888
- Species Helix montrouzieri Souverbie, 1858 accepted as Diplomphalus montrouzieri (Souverbie, 1858)
- Species Helix montserratensis Hidalgo, 1870 accepted as Xerocrassa montserratensis (Hidalgo, 1870)
- Species Helix moquiniana Raymond, 1853
- Species Helix mora J. E. Gray, 1833 accepted as Lucerna mora (J. E. Gray, 1833)
- Species Helix morata Mousson, 1872 accepted as Obelus moratus (Mousson, 1872)
- Species Helix morbida Morelet, 1849 accepted as Hemitrochus morbidus (Morelet, 1849)
- Species Helix mordax Shuttleworth, 1852 accepted as Anguispira mordax (Shuttleworth, 1852)
- Species Helix moreleti L. Pfeiffer, 1849 accepted as Anixa moreleti (L. Pfeiffer, 1849)
- Species Helix moreletiana Heude, 1882 accepted as Nesiohelix moreletiana (Heude, 1882)
- Species Helix moreri Fagot, 1886 accepted as Xerotricha barcinensis (Bourguignat, 1868)
- Species Helix moresbyi Angas, 1876 accepted as Sphaerospira rockhamptonensis (J. C. Cox, 1873)
- Species Helix moretonensis Reeve, 1854
- Species Helix moretonensis L. Pfeiffer, 1855 accepted as Helix moretonensis Reeve, 1854
- Species Helix moricandi L. Pfeiffer, 1842 accepted as Obba moricandi (L. Pfeiffer, 1842)
- Species Helix moricola Paladilhe, 1875 accepted as Xerotricha conspurcata (Draparnaud, 1801)
- Species Helix morleti Dautzenberg & d'Hamonville, 1887 accepted as Neocepolis morleti (Dautzenberg & d'Hamonville, 1887)
- Species Helix mormonum L. Pfeiffer, 1857 accepted as Monadenia mormonum (L. Pfeiffer, 1857)
- Species Helix moroguesi Brongniart, 1810 † accepted as Palaeotachea moroguesi (Brongniart, 1810) †
- Species Helix morosa Morelet, 1853 accepted as Ponderconcha morosa (Morelet, 1853)
- Species Helix morrisii S. V. Wood, 1877 † accepted as Archygromia morrisii (S. V. Wood, 1877) †
- Species Helix morroensis Hemphill, 1911 accepted as Helminthoglypta morroensis (Hemphill, 1911)
- Species Helix morsei Tryon, 1865 accepted as Perpolita binneyana (E. S. Morse, 1864)
- Species Helix morti J. C. Cox, 1864 accepted as Paralaoma morti (J. C. Cox, 1864)
- Species Helix mortilleti L. Pfeiffer, 1859 accepted as Oxychilus mortilleti (L. Pfeiffer, 1859)
- Species Helix mortoni Jeffreys, 1830 accepted as Euconulus fulvus (O. F. Müller, 1774)
- Species Helix morula Hidalgo, 1870 accepted as Isomeria morula (Hidalgo, 1870)
- Species Helix moseleyi E. A. Smith, 1884 accepted as Megalacron novaegeorgiensis (J. C. Cox, 1870)
- Species Helix mossmani Brazier, 1875 accepted as Sphaerospira mossmani (Brazier, 1875)
- Species Helix motacilla L. Pfeiffer, 1855 accepted as Papuina motacilla (L. Pfeiffer, 1855)
- Species Helix mouensis Crosse, 1868 accepted as Pararhytida mouensis (Crosse, 1868)
- Species Helix mouhoti Reeve, 1860 accepted as Bertia cambojiensis (Reeve, 1860)
- Species Helix moulinsi P. Fischer, 1877 accepted as Helix desmoulinsii Farines, 1834
- Species Helix moupiniana Deshayes, 1870 accepted as Tanychlamys moupiniana (Deshayes, 1870)
- Species Helix mourilyani Brazier, 1875 accepted as Steorra mourilyani (Brazier, 1875)
- Species Helix moussoni L. Pfeiffer, 1849 accepted as Asperitas trochus (O. F. Müller, 1774)
- Species Helix moutonii Dupuy, 1847 accepted as Urticicola moutonii (Dupuy, 1847)
- Species Helix moyobambensis J. Moricand, 1858 accepted as Austroselenites moyobambensis (J. Moricand, 1858)
- Species Helix moyssiacensis Noulet, 1857 † accepted as Parachloraea cocquii (Brongniart, 1810) †
- Species Helix mozambicensis L. Pfeiffer, 1855 accepted as Trochonanina mozambicensis (L. Pfeiffer, 1855)
- Species Helix mrazeci Sevastos, 1922 †
- Species Helix mucida L. Pfeiffer, 1857 accepted as Calvigenia mucida (L. Pfeiffer, 1857)
- Species Helix mucoides Tenison Woods, 1879 accepted as Paralaoma mucoides (Tenison Woods, 1879)
- Species Helix mucosa W. T. Blanford & H. F. Blanford, 1861 accepted as Euplecta mucosa (W. T. Blanford & H. F. Blanford, 1861)
- Species Helix mucosa J. C. Cox, 1868 accepted as Eurytrachia mucosa (J. C. Cox, 1868)
- Species Helix mucronata Klein, 1846 † accepted as Leucochroopsis kleinii (Klein, 1846) †
- Species Helix mucronata Möllendorff, 1887 accepted as Aulacospira mucronata (Möllendorff, 1887)
- Species Helix mucronata L. Pfeiffer, 1854 accepted as Helix philyrina Morelet, 1851
- Species Helix muehlfeldtiana Rossmässler, 1837 accepted as Helicopsis striata (O. F. Müller, 1774)
- Species Helix muehlfeldtiana Reeve, 1852 accepted as Pedinogyra rotabilis (Reeve, 1852)
- Species Helix muhlfeldtiana Reeve, 1852 accepted as Pedinogyra rotabilis (Reeve, 1852)
- Species Helix mulgoae J. C. Cox, 1868 accepted as Sauroconcha corneovirens (L. Pfeiffer, 1851)
- Species Helix mulgravensis Brazier, 1872 accepted as Steorra mulgravensis (Brazier, 1872)
- Species Helix mullani Bland & J. G. Cooper, 1861 accepted as Cryptomastix mullani mullani (Bland & J. G. Cooper, 1861)
- Species Helix mülleri L. Pfeiffer, 1844 accepted as Lamarckiella muelleri (L. Pfeiffer, 1844)
- Species Helix multicostata Thomä, 1845 † accepted as Discus multicostatus (Thomä, 1845) †
- Species Helix multidentata A. Binney, 1840 accepted as Paravitrea multidentata (A. Binney, 1840)
- Species Helix multifaria L. Pfeiffer, 1868
- Species Helix multifasciata Weinland & E. von Martens, 1859 accepted as Hemitrochus gilvus (A. Férussac, 1821)
- Species Helix multigranosa Mousson, 1872 accepted as Canariella multigranosa (Mousson, 1872)
- Species Helix multilimbata Hombron & Jacquinot, 1847 accepted as Flammulina zebra (Le Guillou, 1842)
- Species Helix multilineata Say, 1821 accepted as Webbhelix multilineata (Say, 1821)
- Species Helix multispirata Hombron & Jacquinot, 1848
- Species Helix multistriata Deshayes, 1832 accepted as Jeanneretia bicincta (Menke, 1830)
- Species Helix multisulcata Gassies, 1857 accepted as Ptychorhytida aulacospira (L. Pfeiffer, 1846)
- Species Helix multizona R. P. Lesson, 1831 accepted as Papuina multizona (R. P. Lesson, 1831)
- Species Helix mumia Hombron & Jacquinot, 1841
- Species Helix munda W. H. Benson, 1850 accepted as Lyrocystis cosmia (L. Pfeiffer, 1852)
- Species Helix munda C. B. Adams, 1849 accepted as Zaphysema mundum (C. B. Adams, 1849)
- Species Helix munieri Deshayes, 1863 † accepted as Parachloraea munieri (Deshayes, 1863) †
- Species Helix munieriana Crosse & Debeaux, 1863 accepted as Jiaoliaous munierianus (Crosse & Debeaux, 1863)
- Species Helix muralis O. F. Müller, 1774 accepted as Marmorana muralis muralis (O. F. Müller, 1774)
- Species Helix murata Heude, 1885 accepted as Sinicola murata (Heude, 1885)
- Species Helix murina L. Pfeiffer, 1857 accepted as Chloritis murina (L. Pfeiffer, 1857)
- Species Helix murphyi J. C. Cox, 1864 accepted as Ngairea murphyi (J. C. Cox, 1864)
- Species Helix murrayana L. Pfeiffer, 1864 accepted as Huntiana murrayana (L. Pfeiffer, 1864)
- Species Helix muscarum I. Lea, 1834 accepted as Polymita muscarum (I. Lea, 1834)
- Species Helix muscicola R. A. Philippi, 1855 accepted as Radiodiscus muscicola (R. A. Philippi, 1855)
- Species Helix muscicola Bourguignat, 1855 accepted as Monacha crenophila (L. Pfeiffer, 1857)
- Species Helix musdorfensis Servain, 1889 accepted as Arianta arbustorum (Linnaeus, 1758)
- Species Helix musgravei E. A. Smith, 1895 accepted as Cristigibba musgravei (E. A. Smith, 1895)
- Species Helix musicola Shuttleworth, 1854 accepted as Plagioptycha musicola (Shuttleworth, 1854)
- Species Helix musicola R. A. Philippi, 1855
- Species Helix mustelina Reeve, 1854
- Species Helix mutabilis Solander, 1766 †
- Species Helix mutata Lamarck, 1822 accepted as Helix lucorum Linnaeus, 1758
- Species Helix mutata A. Gould, 1846 accepted as Scolodonta mutata (A. Gould, 1846)
- Species Helix mutica Morelet, 1882 accepted as Psichion muticum (Morelet, 1882)
- Species Helix myomphala E. von Martens, 1865 accepted as Satsuma myomphala (E. von Martens, 1865)
- Species Helix myristica Shuttleworth, 1852 accepted as Eremina myristica (Shuttleworth, 1852)
- Species Helix mysolensis L. Pfeiffer, 1863 accepted as Papuina mysolensis (L. Pfeiffer, 1863)
- Species Helix mystagoga Mabille, 1888
- Species Helix nacimientensis C. A. White, 1886 † accepted as Oreohelix nacimientensis (C. A. White, 1886) †
- Species Helix naevula Morelet, 1849 accepted as Cysticopsis naevula (Morelet, 1849)
- Species Helix nagporensis L. Pfeiffer, 1860 accepted as Planispira nagporensis (L. Pfeiffer, 1860)
- Species Helix najas L. Pfeiffer, 1846 accepted as Crystallopsis najas (L. Pfeiffer, 1846)
- Species Helix namaquana E. von Martens, 1889 accepted as Xerocystis capensis (L. Pfeiffer, 1841)
- Species Helix namoiensis J. C. Cox, 1868 accepted as Mesomphix cupreus (Rafinesque, 1831)
- Species Helix nana A. Braun, 1851 † accepted as Esuinella nana (A. Braun, 1851) †
- Species Helix nana W. H. Benson, 1838 accepted as Kaliella nana (W. H. Benson, 1838)
- Species Helix nana J. A. Wagner, 1827 accepted as Systrophiella pygmea (Spix, 1827)
- Species Helix nangporensis L. Pfeiffer, 1860 accepted as Trachia nangporensis (L. Pfeiffer, 1860)
- Species Helix naninoides W. H. Benson, 1842 accepted as Quantula striata (J. E. Gray, 1834)
- Species Helix naninopsis Filhol, 1877 † accepted as Palaeoxestina naninopsis (Filhol, 1877) †
- Species Helix napensis Crosse, 1871 accepted as Solaropsis napensis (Crosse, 1871)
- Species Helix narentana Kobelt, 1877 accepted as Liburnica insolita (Rossmässler, 1838)
- Species Helix narzanensis Krynicki, 1836 accepted as Fruticocampylaea narzanensis (Krynicki, 1836)
- Species Helix naso E. von Martens, 1883 accepted as Rhynchotrochus naso (E. von Martens, 1883)
- Species Helix nasuta Metcalfe, 1852 accepted as Rhinocochlis nasuta (Metcalfe, 1852)
- Species Helix natalensis L. Pfeiffer, 1846 accepted as Sheldonia natalensis (L. Pfeiffer, 1846)
- Species Helix naticoides Draparnaud, 1801 accepted as Cantareus apertus (Born, 1778)
- Species Helix nautarum Heude, 1882
- Species Helix nautiloidea J. C. Cox, 1866 accepted as Elsothera nautiloidea (J. C. Cox, 1866)
- Species Helix navariensis L. Pfeiffer, 1848 accepted as Codringtonia codringtonii (J. E. Gray, 1834)
- Species Helix navasi Fagot, 1907 accepted as Pyrenaearia navasi (Fagot, 1907)
- Species Helix navicula J. A. Wagner, 1827 accepted as Cochlorina navicula (J. A. Wagner, 1827)
- Species Helix navigatorum Reeve, 1854 accepted as Trochomorpha troilus (A. Gould, 1846)
- Species Helix nayliesi Michaud, 1855 † accepted as Frechenia nayliesi (Michaud, 1855) †
- Species Helix nazarina Servain, 1889
- Species Helix nebrascensis Meek & Hayden, 1860 †
- Species Helix nebrodensis Pirajno, 1842 accepted as Marmorana nebrodensis (Pirajno, 1842)
- Species Helix neglecta Draparnaud, 1805 accepted as Cernuella neglecta (Draparnaud, 1805)
- Species Helix neglecta Brazier, 1871 accepted as Planilaoma luckmanii (Brazier, 1877)
- Species Helix neherensis W. H. Benson, 1864 accepted as Tanychlamys neherensis (W. H. Benson, 1864)
- Species Helix nematophora Reeve, 1854 accepted as Allodiscus nematophorus (Reeve, 1854)
- Species Helix nematophora L. Pfeiffer, 1855 accepted as Helix nematophora Reeve, 1854
- Species Helix nemoralina Petit de la Saussaye, 1836 accepted as Levicepolis nemoralina (Petit de la Saussaye, 1836)
- Species Helix nemoralis Linnaeus, 1758 accepted as Cepaea nemoralis (Linnaeus, 1758)
- Species Helix nemoralites Boubée, 1831 † accepted as Galactochiloides nemoralites (Boubée, 1831) †
- Species Helix nemoraloides C. B. Adams, 1845 accepted as Dialeuca nemoraloides (C. B. Adams, 1845)
- Species Helix nemoraloides L. Pfeiffer, 1845 accepted as Dialeuca nemoraloides (C. B. Adams, 1845)
- Species Helix nemorensis O. F. Müller, 1774 accepted as Asperitas nemorensis (O. F. Müller, 1774)
- Species Helix nemorivaga Valenciennes, 1846
- Species Helix neogranadensis L. Pfeiffer, 1848 accepted as Isomeria neogranadensis (L. Pfeiffer, 1845)
- Species Helix neogranatensis L. Pfeiffer, 1845 accepted as Isomeria neogranadensis (L. Pfeiffer, 1845)
- Species Helix nepas L. Pfeiffer, 1855 accepted as Helix nepos L. Pfeiffer, 1855
- Species Helix nephele Strubell, 1895 accepted as Disteustoma nephele (Strubell, 1895)
- Species Helix nepos L. Pfeiffer, 1855 accepted as Tanychlamys nepos (L. Pfeiffer, 1855)
- Species Helix neptunus L. Pfeiffer, 1861 accepted as Hemiplecta distincta (L. Pfeiffer, 1850)
- Species Helix neritina Gmelin, 1791 accepted as Pomacea glauca (Linnaeus, 1758)
- Species Helix neritoidea Linnaeus, 1758 accepted as Sinum neritoideum (Linnaeus, 1758)
- Species Helix neritoidea Gmelin, 1791 accepted as Lamellaria perspicua (Linnaeus, 1758)
- Species Helix nerusia Pollonera, 1892 accepted as Cernuella neglecta (Draparnaud, 1805)
- Species Helix nesana (Iredale, 1937) accepted as Huntiana nesana (Iredale, 1937)
- Species Helix nesicola Mabille, 1883 accepted as Pseudocampylaea portosanctanae (G. B. Sowerby I, 1824)
- Species Helix neumayri Brusina, 1878 † accepted as Megalotachea neumayri (Brusina, 1878) †
- Species Helix nevesiana Castro, 1887
- Species Helix newberryana W. G. Binney, 1858 accepted as Glyptostoma newberryanum newberryanum (W. G. Binney, 1858)
- Species Helix newcombi Reeve, 1854 accepted as Godwinia newcombi (Reeve, 1854)
- Species Helix newcombi L. Pfeiffer, 1855 accepted as Helix newcombi Reeve, 1854
- Species Helix newka Dohrn & Heynemann, 1862 accepted as Xerocrassa newka (Dohrn & Heynemann, 1862)
- Species Helix newtoni G. Nevill & H. Nevill, 1871 accepted as Ctenoglypta newtoni (G. Nevill & H. Nevill, 1871)
- Species Helix neyronensis Fagot, 1879 † accepted as Trochulus hispidus (Linnaeus, 1758)
- Species Helix nicaeensis A. Férussac, 1821
- Species Helix nicaisiana A. Letourneux, 1870
- Species Helix nicatis O. Costa, 1836 accepted as Chilostoma (Cingulifera) cingulatum nicatis (Costa, 1836)
- Species Helix niciensis A. Férussac, 1821 accepted as Macularia niciensis (A. Férussac, 1821)
- Species Helix nickliniana I. Lea, 1838 accepted as Helminthoglypta nickliniana nickliniana (I. Lea, 1838)
- Species Helix nicolai Klećak, 1880 accepted as Liburnica setosa imberbis (Brusina, 1876)
- Species Helix nicolavi Noulet, 1854 † accepted as Parachloraea nicolavi (Noulet, 1854) †
- Species Helix nicomede Brazier, 1878 accepted as Spurlingia dunkiensis (Forbes, 1852)
- Species Helix nicosiana Mousson, 1854 accepted as Metafruticicola nicosiana (Mousson, 1854)
- Species Helix nigrescens W. Wood, 1828 accepted as Pleurodonte nigrescens (W. Wood, 1828)
- Species Helix nigrilabris E. von Martens, 1869 accepted as Xanthomelon jannellei (Le Guillou, 1842)
- Species Helix nigritella L. Pfeiffer, 1847 accepted as Trochomorpha nigritella (L. Pfeiffer, 1847)
- Species Helix nigrofasciata L. Pfeiffer, 1864 accepted as Papuina nigrofasciata (L. Pfeiffer, 1864)
- Species Helix nigropicta L. Pfeiffer, 1866
- Species Helix nigrozonata Bourguignat, 1883 accepted as Helix lucorum Linnaeus, 1758
- Species Helix nilagirica L. Pfeiffer, 1846 accepted as Trachia nilagirica (L. Pfeiffer, 1846)
- Species Helix nilotica Bourguignat, 1863 accepted as Helix asemnis Bourguignat, 1860
- Species Helix nimbosa Crosse, 1868 accepted as Euhadra peliomphala simodae (J. C. Jay, 1856)
- Species Helix ninivita Galland, 1885 accepted as Levantina ninivita (Galland, 1885)
- Species Helix niphas L. Pfeiffer, 1857
- Species Helix nipponensis Kobelt, 1876 accepted as Euhadra amaliae (Kobelt, 1875)
- Species Helix nitefacta Bourguignat, 1884 accepted as Massylaea massylaea (Morelet, 1851)
- Species Helix nitelina Bourguignat, 1852
- Species Helix nitella Morelet, 1851 accepted as Dupontia nitella (Morelet, 1851)
- Species Helix nitens Michaud, 1831 accepted as Aegopinella nitens (Michaud, 1831)
- Species Helix nitida O. F. Müller, 1774 accepted as Zonitoides nitidus (O. F. Müller, 1774)
- Species Helix nitidiuscula G. B. Sowerby I, 1824 accepted as Actinella nitidiuscula (G. B. Sowerby I, 1824)
- Species Helix nitidopsis Morelet, 1851 accepted as Zonitoides nitidopsis (Morelet, 1851)
- Species Helix nitidula Draparnaud, 1805 accepted as Aegopinella nitidula (Draparnaud, 1805)
- Species Helix nivalis Krynicki, 1837 accepted as Caucasigena eichwaldi armeniaca (L. Pfeiffer, 1846)
- Species Helix nivalis A. d'Orbigny, 1835 accepted as Scutalus nivalis (A. d'Orbigny, 1835)
- Species Helix nivariae Wollaston, 1878 accepted as Hemicycla consobrina nivariae (Wollaston, 1878)
- Species Helix nivariensis Shuttleworth, 1852
- Species Helix nivosa G. B. Sowerby I, 1824 accepted as Leptaxis nivosa (G. B. Sowerby I, 1824)
- Species Helix noae Thomä, 1845 † accepted as Cepaea alloiodes (Thomä, 1845) †
- Species Helix nobilis L. Pfeiffer, 1850 accepted as Hemiplecta nobilis (L. Pfeiffer, 1850)
- Species Helix nobilis C. B. Adams, 1850 accepted as Lucerna lucerna (O. F. Müller, 1774)
- Species Helix nodifera L. Pfeiffer, 1861 accepted as Papuina nodifera (L. Pfeiffer, 1861)
- Species Helix nodosaria A. d'Orbigny, 1835 accepted as Gastrocopta nodosaria (A. d'Orbigny, 1835)
- Species Helix nodosostriata Mousson, 1872 accepted as Obelus mirandae (R. T. Lowe, 1861)
- Species Helix nomichosi A. Letourneux, 1884
- Species Helix nordmanni Mousson, 1854 accepted as Lindholmia nordmanni (Mousson, 1854)
- Species Helix normalis Pease, 1864 accepted as Liardetia normalis (Pease, 1864)
- Species Helix norodomiana Morlet, 1883 accepted as Trichochloritis norodomiana (Morlet, 1883)
- Species Helix norrisii L. Pfeiffer, 1842 accepted as Calocochlea norrisii (L. Pfeiffer, 1842)
- Species Helix nortoni Calcara, 1845 accepted as Oxychilus nortoni (Calcara, 1843)
- Species Helix noscibilis A. Férussac, 1832 accepted as Zachrysia auricoma (A. Férussac, 1821)
- Species Helix nostrandiae [sic] accepted as Triodopsis vannostrandi (Bland, 1876)
- Species Helix notata Deshayes, 1830 accepted as Xolotrema notatum (Deshayes, 1830)
- Species Helix notata Poey, 1858 accepted as Daedalochila poeyi (Aguayo & Jaume, 1947)
- Species Helix noueli Deshayes, 1863 † accepted as Cepaea noueli (Deshayes, 1863) †
- Species Helix nouleti Matheron, 1861 † accepted as Cepaea nouleti (Matheron, 1861) †
- Species Helix nouleti Le Guillou, 1842 accepted as Irenella nouleti (Le Guillou, 1842)
- Species Helix noumeensis Crosse, 1870 accepted as Andrefrancia noumeensis (Crosse, 1870)
- Species Helix novacula accepted as Helix novaeula E. von Martens, 1879
- Species Helix novaegeorgiensis J. C. Cox, 1870 accepted as Megalacron novaegeorgiensis (J. C. Cox, 1870)
- Species Helix novaehiberniae Quoy & Gaimard, 1832
- Species Helix novaeula E. von Martens, 1879 accepted as Ampelita xystera (L. Pfeiffer, 1841)
- Species Helix novare L. Pfeiffer, 1861
- Species Helix novella Reeve, 1854 accepted as Cryptozona novella (Reeve, 1854)
- Species Helix noverca L. Pfeiffer, 1853 accepted as Metafruticicola noverca (L. Pfeiffer, 1853)
- Species Helix novoguineensis L. Pfeiffer, 1863 accepted as Papuina novoguineensis (L. Pfeiffer, 1863)
- Species Helix nubeculata Deshayes, 1831 accepted as Solaropsis nubeculata (Deshayes, 1831)
- Species Helix nubigena de Saulcy, 1852 accepted as Helicella nubigena (de Saulcy, 1852)
- Species Helix nubigena R. T. Lowe, 1861
- Species Helix nubivaga Mabille, 1882 accepted as Xerotricha nubivaga (Mabille, 1882)
- Species Helix nucleola Rang, 1835
- Species Helix nucleus Gmelin, 1791 accepted as Cassidula nucleus (Gmelin, 1791)
- Species Helix nucleus Deshayes, 1874 accepted as Bradybaena similaris nucleus (Deshayes, 1874)
- Species Helix nucula Mousson, 1854
- Species Helix nuda Reeve, 1852 accepted as Tanychlamys nuda (Reeve, 1852)
- Species Helix nullarborica Tate, 1880 accepted as Sinumelon nullarboricum (Tate, 1880)
- Species Helix nummulina A. Braun, 1851 † accepted as Praeoestophorella phacodes (Thomä, 1845) †
- Species Helix nupera Brazier, 1875 accepted as Luinodiscus cupreus (J. C. Cox, 1868)
- Species Helix nutans Megerle von Mühlfeld, 1824 accepted as Vitreobalcis nutans (Megerle von Mühlfeld, 1824)
- Species Helix nuttalliana I. Lea, 1838 accepted as Monadenia fidelis fidelis (J. E. Gray, 1834)
- Species Helix nuxdenticulata A. Férussac, 1821
- Species Helix nyeli Mittre, 1842 accepted as Xerocrassa nyeli (Mittre, 1842)
- Species Helix nympha L. Pfeiffer, 1850 accepted as Chloraea filaris (L. Pfeiffer, 1845)
- Species Helix nymphaea Mousson, 1863 accepted as Circassina frutis circassica (Mousson, 1863)
- Species Helix nystiana L. Pfeiffer, 1846
- Species Helix oajacensis L. Pfeiffer, 1842 accepted as Trichodiscina oajacensis (L. Pfeiffer, 1842)
- Species Helix oajacensis F. C. L. Koch, 1843 accepted as Trichodiscina oajacensis (L. Pfeiffer, 1842)
- Species Helix obconica Pease, 1864 accepted as Pukaloa obconica (Pease, 1864)
- Species Helix obeliscus S. Moricand, 1834 accepted as Obeliscus obeliscus (S. Moricand, 1834)
- Species Helix oberndoerferi Kobelt, 1882
- Species Helix obesa H. Beck, 1837 accepted as Dentellaria obesa (H. Beck, 1837)
- Species Helix obiensis E. von Martens, 1898 accepted as Albersia obiensis (E. von Martens, 1898)
- Species Helix obliquata Deshayes, 1850 accepted as Crystallopsis obliquata (Deshayes, 1850)
- Species Helix obliquata Reeve, 1852 accepted as Hemiplecta obliquata (Reeve, 1852)
- Species Helix obliquirugosa E. A. Smith, 1894 accepted as Xanthomelon obliquirugosum (E. A. Smith, 1894)
- Species Helix obliterata A. Férussac, 1822 accepted as Hispaniolana obliterata (A. Férussac, 1822)
- Species Helix oblonga G. B. Sowerby I, 1841 accepted as Phoenicobius oblongus (G. B. Sowerby I, 1841)
- Species Helix oblonga O. F. Müller, 1774 accepted as Megalobulimus oblongus (O. F. Müller, 1774)
- Species Helix obnubila Reeve, 1852 accepted as Thalassohelix obnubila (Reeve, 1852)
- Species Helix obolus A. Gould, 1846 accepted as Nesodiscus obolus (A. Gould, 1846)
- Species Helix obruta Morelet, 1860 accepted as Moreletina obruta (Morelet, 1860)
- Species Helix obscura O. F. Müller, 1774 accepted as Merdigera obscura (O. F. Müller, 1774)
- Species Helix obscura Deshayes, 1874
- Species Helix obscurata A. Adams & Reeve, 1850 accepted as Macrocycloides obscuratus (A. Adams & Reeve, 1850)
- Species Helix obscurata Porro, 1841 accepted as Oxychilus obscuratus (Porro, 1841)
- Species Helix obserata R. T. Lowe, 1852 accepted as Actinella obserata (R. T. Lowe, 1852)
- Species Helix obsita L. Pfeiffer, 1866
- Species Helix obstricta Say, 1821 accepted as Xolotrema obstrictum (Say, 1821)
- Species Helix obstructa L. Pfeiffer, 1842 accepted as Monacha obstructa (L. Pfeiffer, 1842)
- Species Helix obstructa Heude, 1882 accepted as Metodontia huaiensis (Crosse, 1882)
- Species Helix obstrulenta Locard, 1894 † accepted as Trochulus plebeius (Draparnaud, 1805)
- Species Helix obtusa L. Pfeiffer, 1845 accepted as Calocochlea obtusa (L. Pfeiffer, 1845)
- Species Helix obtusalis Bourguignat, 1860 accepted as Helix albescens Rossmässler, 1839
- Species Helix obtusangula L. Pfeiffer, 1850 accepted as Hiona exaequata (A. Gould, 1846)
- Species Helix obtusata Gmelin, 1791 accepted as Paraclavator obtusatus (Gmelin, 1791)
- Species Helix obtusata Rossmässler, 1837 accepted as Helix albescens Rossmässler, 1839
- Species Helix obtusata de Serres, 1844 † accepted as Galactochiloides nemoralites (Boubée, 1831) †
- Species Helix obvia Menke, 1828 accepted as Xerolenta obvia (Menke, 1828)
- Species Helix obvoluta O. F. Müller, 1774 accepted as Helicodonta obvoluta obvoluta (O. F. Müller, 1774)
- Species Helix occidentalis Meek & Hayden, 1857 † accepted as Helix nebrascensis Meek & Hayden, 1860 †
- Species Helix occlusa F. E. Edwards, 1852 † accepted as Palaeoxestina occlusa (F. E. Edwards, 1852) †
- Species Helix occonella Letourneux & Bourguignat, 1887
- Species Helix occulta L. Pfeiffer, 1861 accepted as Austrochloritis occulta (L. Pfeiffer, 1861)
- Species Helix oceanica Le Guillou, 1842
- Species Helix ochsenii R. A. Philippi, 1855 accepted as Amphidoxa ochsenii (R. A. Philippi, 1855)
- Species Helix ochthephila A. d'Orbigny, 1835
- Species Helix ochthoplax W. H. Benson, 1860 accepted as Camaena ochthoplax (W. H. Benson, 1860)
- Species Helix oconnellensis J. C. Cox, 1871 accepted as Sphaerospira oconnellensis (J. C. Cox, 1871)
- Species Helix octanfracta Montagu, 1803 accepted as Omphiscola glabra (O. F. Müller, 1774)
- Species Helix octona Linnaeus, 1767
- Species Helix oculus L. Pfeiffer, 1850 accepted as Aegista oculus (L. Pfeiffer, 1850)
- Species Helix oculuscapri Linnaeus, 1758
- Species Helix oculuscommunis Gmelin, 1791 accepted as Pomacea glauca (Linnaeus, 1758)
- Species Helix oddoi Brusina, 1902 †
- Species Helix odeca Bourguignat, 1882 accepted as Hygromia odeca (Bourguignat, 1882)
- Species Helix odontina Morelet, 1851 accepted as Erepta odontina (Morelet, 1851)
- Species Helix odontophora W. H. Benson, 1865 accepted as Corilla odontophora (W. H. Benson, 1865)
- Species Helix oenostoma Deshayes, 1850 accepted as Euhadra oenostoma (Deshayes, 1850)
- Species Helix ofellata Locard, 1899 accepted as Candidula olisippensis (Servain, 1880)
- Species Helix oglei Godwin-Austen, 1879 accepted as Endothyrella oglei (Godwin-Austen, 1879)
- Species Helix okeniana L. Pfeiffer, 1845 accepted as Dentellaria okeniana (L. Pfeiffer, 1845)
- Species Helix oldhami W. H. Benson, 1859 accepted as Aegista oldhami (W. H. Benson, 1859)
- Species Helix oleacea Shuttleworth, 1852 accepted as Monilearia oleacea (Shuttleworth, 1852)
- Species Helix oleosa L. Pfeiffer, 1850 accepted as Thapsia oleosa (L. Pfeiffer, 1850)
- Species Helix olisippensis Servain, 1880 accepted as Xeroplexa olisippensis (Servain, 1880)
- Species Helix olivetorum Gmelin, 1791 accepted as Retinella olivetorum (Gmelin, 1791)
- Species Helix olivieri Rossmässler, 1837 accepted as Monacha parumcincta (Menke, 1828)
- Species Helix olla de Serres, 1844 † accepted as Eurystrophe olla (de Serres, 1844) †
- Species Helix olympica J. R. Roth, 1855 accepted as Cattania olympica (J. R. Roth, 1855)
- Species Helix omalisma Fagot, 1879 accepted as Gonyodiscus rotundatus omalisma (Fagot, 1879)
- Species Helix omalomorpha A. d'Orbigny, 1835
- Species Helix omega L. Pfeiffer, 1853 accepted as Flammoconcha compressivoluta (Reeve, 1852)
- Species Helix omicron L. Pfeiffer, 1852 accepted as Nautiliropa omicron (L. Pfeiffer, 1852)
- Species Helix omissa L. Pfeiffer, 1856
- Species Helix omnivaga Locard, 1899 accepted as Xerosecta promissa (Westerlund, 1892)
- Species Helix omoia Mabille, 1884
- Species Helix omphalion W. H. Benson, 1864 accepted as Lyrocystis cosmia (L. Pfeiffer, 1852)
- Species Helix omphalodes L. Pfeiffer, 1845 accepted as Ampelita omphalodes (L. Pfeiffer, 1845)
- Species Helix omphalus F. E. Edwards, 1852 † accepted as Discus omphalus (F. E. Edwards, 1852) †
- Species Helix onca A. d'Orbigny, 1835 accepted as Plekocheilus floccosus (Spix, 1827)
- Species Helix onestera Mabille, 1887 accepted as Globotrochus onestera (Mabille, 1887)
- Species Helix onisterella Mabille, 1889
- Species Helix onixiomicra Bourguignat, 1860 accepted as Helix lucorum Linnaeus, 1758
- Species Helix oomorpha Mabille, 1884 accepted as Embertoniphanta goudotiana (L. Pfeiffer, 1845)
- Species Helix oomorpha G. B. Sowerby I, 1841 accepted as Phoenicobius oomorphus (G. B. Sowerby I, 1841)
- Species Helix opaca Gmelin, 1791
- Species Helix opalina Westerlund, 1902
- Species Helix opalina C. B. Adams, 1845 accepted as Proserpinula infortunata (Bland, 1854)
- Species Helix opalinus G. B. Sowerby I, 1841 accepted as Phengus opalinus (G. B. Sowerby I, 1841)
- Species Helix opanica Anton, 1838 accepted as Helix oparica Anton, 1838
- Species Helix oparica Anton, 1838 accepted as Ruatara oparica (Anton, 1838)
- Species Helix operculina A. Gould, 1859 accepted as Fametesta operculina (A. Gould, 1859)
- Species Helix ophelia Reeve, 1854
- Species Helix ophiria L. Pfeiffer, 1857 accepted as Megaustenia heliciformis (L. Pfeiffer, 1855)
- Species Helix ophthalmorycha Mabille, 1882
- Species Helix oppilata Morelet, 1849 accepted as Linisa oppilata (Morelet, 1849)
- Species Helix oranensis Morelet, 1852 accepted as Xerophila oranensis (Morelet, 1852)
- Species Helix orbicula W. H. Benson, 1838 accepted as Landouria huttonii (L. Pfeiffer, 1842)
- Species Helix orbicula A. d'Orbigny, 1835
- Species Helix orbicularis Klein, 1846 † accepted as Pleurodiscoides (Pleurodiscoides) orbicularis (Klein, 1846) †
- Species Helix orbiculata A. Férussac, 1822 accepted as Pleurodonte orbiculata (A. Férussac, 1822)
- Species Helix orbignii A. d'Orbigny, 1836 accepted as Xerotricha orbignii (A. d'Orbigny, 1836)
- Species Helix orbignyi A. d'Orbigny, 1836 accepted as Helix orbignii A. d'Orbigny, 1836
- Species Helix orbitulus G. B. Sowerby I, 1841 accepted as Cochlodryas orbitula (G. B. Sowerby I, 1841)
- Species Helix orcula W. H. Benson, 1850 accepted as Pupisoma orcula (W. H. Benson, 1850)
- Species Helix oreades A. d'Orbigny, 1835 accepted as Mesembrinus oreades (A. d'Orbigny, 1835)
- Species Helix oreas F. C. L. Koch, 1844 accepted as Isomeria oreas (F. C. L. Koch, 1844)
- Species Helix oregonensis I. Lea, 1838 accepted as Monadenia fidelis fidelis (J. E. Gray, 1834)
- Species Helix oreina Fagot, 1888 accepted as Xerocrassa ripacurcica oreina (Fagot, 1888)
- Species Helix oresigena A. d'Orbigny, 1835 accepted as Epiphragmophora oresigena (A. d'Orbigny, 1835)
- Species Helix organiaca Fagot, 1905 accepted as Pyrenaearia organiaca (Fagot, 1905)
- Species Helix orientalis A. Adams & Reeve, 1850 accepted as Euhadra (Nesiohelix) samarangae Kuroda & Miyanaga, 1943
- Species Helix orithyia E. von Martens, 1879 accepted as Cathaica orithyia (E. von Martens, 1879)
- Species Helix ornatella L. Pfeiffer, 1847 accepted as Philonesia filiceti (H. Beck, 1838)
- Species Helix ornatissima W. H. Benson, 1859 accepted as Khasiella ornatissima (W. H. Benson, 1859)
- Species Helix ornezanensis Noulet, 1854 † accepted as Mesodontopsis ludovici (Noulet, 1854) †
- Species Helix orobaena A. d'Orbigny, 1835 accepted as Thaumastus orobaenus (A. d'Orbigny, 1835)
- Species Helix orobia W. H. Benson, 1848 accepted as Oxytesta orobia (W. H. Benson, 1848)
- Species Helix orotavana Mousson, 1872 accepted as Xerotricha orbignii (A. d'Orbigny, 1836)
- Species Helix orphana Heude, 1882 accepted as Punctum orphana (Heude, 1882)
- Species Helix orsini Porro, 1841 accepted as Monacha orsini (Porro, 1841)
- Species Helix orthocheilis Heude, 1886 accepted as Helix (Plectotropis) hupensis Gredler, 1885
- Species Helix orthostoma L. Pfeiffer, 1846 accepted as Inozonites orthostoma (L. Pfeiffer, 1846)
- Species Helix ortoni Crosse, 1871 accepted as Systrophia ortoni (Crosse, 1871)
- Species Helix osbeckii R. A. Philippi, 1847 accepted as Plectotropis osbeckii (R. A. Philippi, 1847)
- Species Helix oscitans E. von Martens, 1885 accepted as Nipponochloritis oscitans (E. von Martens, 1885)
- Species Helix osculans C. B. Adams, 1850 accepted as Hyalosagda osculans (C. B. Adams, 1850)
- Species Helix osculina F. Sandberger, 1875 † accepted as Klikia osculina (F. Sandberger, 1875) †
- Species Helix osculum Thomä, 1845 † accepted as Klikia osculum (Thomä, 1845) †
- Species Helix osoria Brancsik, 1890
- Species Helix ossetinensis Mousson, 1863 accepted as Fruticocampylaea narzanensis (Krynicki, 1836)
- Species Helix ostiolum Crosse, 1870 accepted as Andrefrancia ostiolum (Crosse, 1870)
- Species Helix ostreola Heude, 1890 accepted as Geotrochatella gredleriana (Möllendorff, 1885)
- Species Helix otis W. Turton, 1819 accepted as Otina ovata (T. Brown, 1827)
- Species Helix otis [Lightfoot], 1786 accepted as Labyrinthus otis ([Lightfoot], 1786)
- Species Helix otostoma Reeve, 1852 accepted as Labyrinthus otostomus (Reeve, 1852)
- Species Helix otthiana Forbes, 1838 accepted as Sphincterochila otthiana (Forbes, 1838)
- Species Helix otwayensis Petterd, 1879 accepted as Oreomava otwayensis (Petterd, 1879)
- Species Helix oualanensis Pease, 1866 accepted as Delos oualanensis (Pease, 1866)
- Species Helix ousterea Mabille, 1880 accepted as Theba cemenelea Risso, 1826
- Species Helix ouveana Souverbie, 1869
- Species Helix ovalis W. Wood, 1818 accepted as Megalobulimus oblongus (O. F. Müller, 1774)
- Species Helix ovata O. F. Müller, 1774 accepted as Megalobulimus ovatus (O. F. Müller, 1774)
- Species Helix oviformis Grateloup, 1840 accepted as Embertoniphanta oviformis (Grateloup, 1840)
- Species Helix ovipara Solander, 1786 accepted as Megalobulimus oblongus (O. F. Müller, 1774)
- Species Helix ovularis Menke, 1828 accepted as Orthostylus metaformis (A. Férussac, 1821)
- Species Helix ovularis Bourguignat, 1855 accepted as Monacha ovularis (Bourguignat, 1855)
- Species Helix ovum Valenciennes, 1827 accepted as Ryssota otaheitana ovum (Valenciennes, 1827)
- Species Helix ovumreguli I. Lea, 1834
- Species Helix oweniana L. Pfeiffer, 1854 accepted as Lamarckiella oweniana (L. Pfeiffer, 1854)
- Species Helix owenii Reeve, 1853 accepted as Lamarckiella oweniana (L. Pfeiffer, 1854)
- Species Helix oxygyra Charpentier, 1847 accepted as Monacha nummus (Ehrenberg, 1831)
- Species Helix oxystoma Thomä, 1845 † accepted as Parachloraea oxystoma (Thomä, 1845) †
- Species Helix oxytes W. H. Benson, 1836 accepted as Oxytesta oxytes (W. H. Benson, 1836)
- Species Helix pachnodes O. Boettger, 1884 accepted as Abchasohela pachnodes (O. Boettger, 1884)
- Species Helix pachya Bourguignat, 1860 accepted as Helix nucula Mousson, 1854
- Species Helix pachygastra J. E. Gray, 1834 accepted as Pleurodonte pachygastra (J. E. Gray, 1834)
- Species Helix pachyloma Menke, 1847 accepted as Praticolella pachyloma (Menke, 1847)
- Species Helix pachypleura Bourguignat, 1882 accepted as Helix melanostoma Draparnaud, 1801
- Species Helix pachystoma Klein, 1853 † accepted as Palaeotachea dentula (Quenstedt, 1867) †
- Species Helix pachystoma Hombron & Jacquinot, 1841 accepted as Trukrhysa pachystoma (Hombron & Jacquinot, 1841)
- Species Helix pachystyla L. Pfeiffer, 1845 accepted as Xanthomelon pachystylum (L. Pfeiffer, 1845)
- Species Helix pachystyloides J. C. Cox, 1868 accepted as Xanthomelon jannellei (Le Guillou, 1842)
- Species Helix pacifica L. Pfeiffer, 1846 accepted as Habroconus pacificus (L. Pfeiffer, 1846)
- Species Helix paeteliana L. Pfeiffer, 1859 accepted as Hemicycla paeteliana (L. Pfeiffer, 1859)
- Species Helix pagodula Reeve, 1854
- Species Helix paivana R. T. Lowe, 1861
- Species Helix paivana Morelet, 1864 accepted as Hemicycla paivanopsis (Mabille, 1882)
- Species Helix paivanopsis Mabille, 1882 accepted as Hemicycla paivanopsis (Mabille, 1882)
- Species Helix paladilhi Bourguignat, 1866 accepted as Xeroplexa intersecta (Poiret, 1801)
- Species Helix palawanica L. Pfeiffer, 1855 accepted as Mesanella monochroa palawanica (L. Pfeiffer, 1855)
- Species Helix palearcha Fagot, 1879
- Species Helix paleata Reeve, 1854 accepted as Plectorhagada plectilis (W. H. Benson, 1853)
- Species Helix pallaresica Fagot, 1886 accepted as Xerotricha madritensis (Rambur, 1868)
- Species Helix pallasiana L. Pfeiffer, 1850 accepted as Mandarina pallasiana (L. Pfeiffer, 1850)
- Species Helix pallescens C. B. Adams, 1851 accepted as Dentellaria pallescens (C. B. Adams, 1851)
- Species Helix pallescens L. Pfeiffer, 1859 accepted as Dentellaria pallescens (C. B. Adams, 1851)
- Species Helix palliata Say, 1821 accepted as Xolotrema notatum (Deshayes, 1830)
- Species Helix pallida Ijima, 1891 accepted as Ainohelix editha (A. Adams, 1868)
- Species Helix palmaria W. H. Benson, 1864 accepted as Sitala palmaria (W. H. Benson, 1864)
- Species Helix palmarum Morelet, 1873 accepted as Trochozonites palmarum (Morelet, 1873)
- Species Helix palmarum Vinassa de Regny, 1896 †
- Species Helix palmensis Brazier, 1876 accepted as Steorra mulgravensis (Brazier, 1872)
- Species Helix palmicola Mabille, 1898
- Species Helix paludicola W. H. Benson, 1850 accepted as Xerocystis capensis paludicola (W. H. Benson, 1850)
- Species Helix paludosa L. Pfeiffer, 1839 accepted as Polygyra lingulata (Deshayes, 1839)
- Species Helix paludosa da Costa, 1778 accepted as Vallonia pulchella (O. F. Müller, 1774)
- Species Helix palumba Souverbie, 1860 accepted as Phoenicobius palumbus (Souverbie, 1860)
- Species Helix palumboi Cafici, 1884
- Species Helix pampelonensis A. Schmidt, 1855 accepted as Helicella itala pampelonensis (A. Schmidt, 1855)
- Species Helix pan Broderip, 1841 accepted as Calocochlea pan (Broderip, 1841)
- Species Helix panayensis L. Pfeiffer, 1842 accepted as Hemiglypta panayensis (L. Pfeiffer, 1842)
- Species Helix pandorae Forbes, 1850 accepted as Xerarionta pandorae (Forbes, 1850)
- Species Helix pansa W. H. Benson, 1856 accepted as Nanina (Rotula) pansa (W. H. Benson, 1856)
- Species Helix pantanellii De Stefani, 1879 accepted as Monacha pantanellii (De Stefani, 1879)
- Species Helix pantheia Mabille, 1888
- Species Helix papilionacea Valenciennes, 1827 accepted as Obba papilionacea (Valenciennes, 1827)
- Species Helix papilla O. F. Müller, 1774 accepted as Obba papilla (O. F. Müller, 1774)
- Species Helix papillaris O. F. Müller, 1774 accepted as Papillifera papillaris papillaris (O. F. Müller, 1774)
- Species Helix papillata L. Pfeiffer, 1846
- Species Helix papilliformis Kobelt, 1875 accepted as Satsuma papilliformis (Kobelt, 1875)
- Species Helix papua R. P. Lesson, 1831 accepted as Trochomorpha papua (R. P. Lesson, 1831)
- Species Helix papuensis Quoy & Gaimard, 1832 accepted as Papuina papuensis (Quoy & Gaimard, 1832)
- Species Helix papyracea Mawe, 1823 accepted as Drymaeus papyraceus (Mawe, 1823)
- Species Helix papyracea Broderip, 1841 accepted as Chloraea papyracea (Broderip, 1841)
- Species Helix paradensis L. Pfeiffer, 1861 accepted as Mesomphix paradensis (L. Pfeiffer, 1861)
- Species Helix paradoxa Born, 1780 accepted as Chrysostoma paradoxum (Born, 1780)
- Species Helix paradoxa J. C. Cox, 1864 accepted as Paralaoma morti (J. C. Cox, 1864)
- Species Helix paradoxa L. Pfeiffer, 1844 accepted as Chloraea paradoxa (L. Pfeiffer, 1844)
- Species Helix paraeruginosa Heude, 1888
- Species Helix paraguayana L. Pfeiffer, 1842 accepted as Scolodonta paraguayana (L. Pfeiffer, 1842)
- Species Helix parallela Poey, 1858 accepted as Jeanneretia parraiana parallela (Poey, 1858)
- Species Helix parasitarum Heude, 1885
- Species Helix parasitica Heude, 1885
- Species Helix paredesii A. d'Orbigny, 1835 accepted as Pupoides paredesii (A. d'Orbigny, 1835)
- Species Helix paretiana Issel, 1868 † accepted as Cepaea paretiana (Issel, 1868) †
- Species Helix paricincta E. von Martens, 1879 accepted as Bradybaena paricincta (E. von Martens, 1879)
- Species Helix parlatoris And. Bivona, 1839 accepted as Schileykiella parlatoris (And. Bivona, 1839)
- Species Helix parmula Broderip, 1841 accepted as Obba parmula (Broderip, 1841)
- Species Helix paropta Mabille, 1886
- Species Helix parraiana A. d'Orbigny, 1841 accepted as Jeanneretia parraiana (A. d'Orbigny, 1841)
- Species Helix parramattensis J. C. Cox, 1864 accepted as Euconulus fulvus (O. F. Müller, 1774)
- Species Helix parreyssi L. Pfeiffer, 1853 accepted as Monacha cemenelea (Risso, 1826)
- Species Helix partita Reeve, 1854 accepted as Euplecta partita (Reeve, 1854)
- Species Helix parumcincta Menke, 1828 accepted as Monacha parumcincta (Menke, 1828)
- Species Helix parva L. Pfeiffer, 1848 accepted as Cernuella virgata (Da Costa, 1778)
- Species Helix parvidens Pease, 1861 accepted as Mautodontha (Garrettoconcha) parvidens (Pease, 1861)
- Species Helix parvula A. Braun, 1851 †
- Species Helix pascalia Cailliaud, 1857 accepted as Solaropsis pascalia (Cailliaud, 1857)
- Species Helix pastorella "Valenciennes" L. Pfeiffer, 1855 accepted as Hypselostyla cincinna (G. B. Sowerby I, 1841)
- Species Helix patagonica A. d'Orbigny, 1835 accepted as Plagiodontes patagonicus (A. d'Orbigny, 1835)
- Species Helix patane W. H. Benson, 1859 accepted as Tanychlamys patane (W. H. Benson, 1859)
- Species Helix patescens J. C. Cox, 1870 accepted as Allenoconcha patescens (J. C. Cox, 1870)
- Species Helix patesensis L. Pfeiffer, 1859 accepted as Epiphragmophora patasensis (L. Pfeiffer, 1859)
- Species Helix pathetica Mousson, 1854
- Species Helix patina C. B. Adams, 1849 accepted as Lucerna lucerna (O. F. Müller, 1774)
- Species Helix patricia L. Pfeiffer, 1859 accepted as Chloraea patricia (L. Pfeiffer, 1859)
- Species Helix patula Deshayes, 1832 accepted as Discus patulus (Deshayes, 1832)
- Species Helix patungana Gredler, 1887 accepted as Plectotropis patungensis (Gredler, 1887)
- Species Helix paucilirata Morelet, 1851 accepted as Glyphyalinia umbilicata (T. D. A. Cockerell, 1893)
- Species Helix paulina Vinassa de Regny, 1897 † accepted as Dentellocaracolus paulina (Vinassa de Regny, 1897) †
- Species Helix paulinae Pallary, 1899
- Species Helix paulucciae Crosse, 1868 accepted as Ptychorhytida testudinaria (Gassies, 1859)
- Species Helix pauper A. Gould, 1859 accepted as Discus pauper (A. Gould, 1859)
- Species Helix pauxillula W. H. Benson, 1859 accepted as Tanychlamys pauxillula (W. H. Benson, 1859)
- Species Helix pauxillus A. Gould, 1852 accepted as Nesovitrea pauxilla (A. Gould, 1852)
- Species Helix pavida Mousson, 1872 accepted as Xerotricha pavida (Mousson, 1872)
- Species Helix paviei Morlet, 1885 accepted as Sivella paviei (Morlet, 1885)
- Species Helix pazensis Poey, 1854 accepted as Caracolus marginella (Gmelin, 1791)
- Species Helix pazi R. A. Philippi, 1866 accepted as Lilloiconcha pazi (R. A. Philippi, 1866)
- Species Helix paziana A. d'Orbigny, 1835
- Species Helix peaseana L. Pfeiffer, 1865 accepted as Asperitas trochus (O. F. Müller, 1774)
- Species Helix pedemontana Pini, 1885
- Species Helix pedestris A. Gould, 1846 accepted as Allogona townsendiana (I. Lea, 1838)
- Species Helix pedina W. H. Benson, 1865 accepted as Tanychlamys pedina (W. H. Benson, 1865)
- Species Helix peguensis W. H. Benson, 1860
- Species Helix pekinensis Deshayes, 1874 accepted as Cathaica pekinensis (Deshayes, 1874)
- Species Helix pelagonesica (H. Rolle, 1898)
- Species Helix pelasgica Kobelt, 1904 accepted as Helix figulina Rossmässler, 1839
- Species Helix pelewana Mousson, 1869 accepted as Chloraea pelewana (Mousson, 1869)
- Species Helix peliomphala L. Pfeiffer, 1850 accepted as Euhadra peliomphala (L. Pfeiffer, 1850)
- Species Helix pellati Deshayes, 1863 † accepted as Zonitoides pellati (Deshayes, 1863) †
- Species Helix pellicula A. Férussac, 1821 accepted as Cysticopsis pellicula (A. Férussac, 1821)
- Species Helix pelliculata Poey, 1858 accepted as Cysticopsis pemphigodes (L. Pfeiffer, 1847)
- Species Helix pellisboae Hupé, 1853 accepted as Solaropsis pellisboae (Hupé, 1853)
- Species Helix pelliscolubri R. A. Philippi, 1867 accepted as Epiphragmophora pelliscolubri (R. A. Philippi, 1867)
- Species Helix pellisserpentis Gmelin, 1791 accepted as Solaropsis pellisserpentis (Gmelin, 1791)
- Species Helix pellita A. Férussac, 1832 accepted as Metafruticicola pellita (A. Férussac, 1832)
- Species Helix pellucens L. Pfeiffer, 1847 accepted as Cyrnotheba corsica (Shuttleworth, 1843)
- Species Helix pellucida O. F. Müller, 1774 accepted as Vitrina pellucida (O. F. Müller, 1774)
- Species Helix pellucida Razoumowsky, 1789 accepted as Physa fontinalis (Linnaeus, 1758)
- Species Helix pellucida C. B. Adams, 1845 accepted as Stauroglypta anthoniana (C. B. Adams, 1849)
- Species Helix pelodes L. Pfeiffer, 1846 accepted as Parglogenia pelodes (L. Pfeiffer, 1846)
- Species Helix pemphigodes L. Pfeiffer, 1847 accepted as Cysticopsis pemphigodes (L. Pfeiffer, 1847)
- Species Helix pena J. C. Cox, 1868
- Species Helix pencana R. A. Philippi, 1858
- Species Helix penchinati Bourguignat, 1868 accepted as Xerocrassa penchinati (Bourguignat, 1868)
- Species Helix penicillata A. Gould, 1842
- Species Helix penicillata Poey, 1858 accepted as Hemitrochus lucipeta (Poey, 1854)
- Species Helix pennantiana L. Pfeiffer, 1845
- Species Helix pennsylvanicus Green, 1827 accepted as Patera pennsylvanica (Green, 1827)
- Species Helix penolensis J. C. Cox, 1868 accepted as Magilaoma penolensis (J. C. Cox, 1868)
- Species Helix pentadina A. d'Orbigny, 1835 accepted as Plekocheilus floccosus (Spix, 1827)
- Species Helix pentodon Menke, 1846 accepted as Cerion uva (Linnaeus, 1758)
- Species Helix peracanthoda Bourguignat, 1883 accepted as Acanthinula peracanthoda (Bourguignat, 1883)
- Species Helix peracutissima C. B. Adams, 1845 accepted as Dentellaria peracutissima (C. B. Adams, 1845)
- Species Helix peraeruginosa Heude, 1888
- Species Helix peraffinis C. B. Adams, 1845 accepted as Stauroglypta peraffinis (C. B. Adams, 1845)
- Species Helix perambigua E. A. Smith, 1895 accepted as Gemitelix perambigua (E. A. Smith, 1895)
- Species Helix percussa Heude, 1882 accepted as Trichochloritis percussa (Heude, 1882)
- Species Helix perdepressa C. B. Adams, 1849 accepted as Aerotrochus perdepressa (C. B. Adams, 1849)
- Species Helix perdita Reeve, 1851 accepted as Helicostyla buschi (L. Pfeiffer, 1846)
- Species Helix perelegans Deshayes, 1863 † accepted as Calogoniodiscus perelegans (Deshayes, 1863) †
- Species Helix perfecta Bourguignat, 1883 accepted as Chilostoma colubrinum colubrinum (De Cristofori & Jan, 1832)
- Species Helix perforata Deshayes, 1874
- Species Helix perfucata W. H. Benson, 1853 accepted as Tanychlamys perfucata (W. H. Benson, 1853)
- Species Helix pergraphica Mabille, 1883 accepted as Caseolus abjectus (R. T. Lowe, 1831)
- Species Helix peripheria C. A. White, 1876 † accepted as Oreohelix peripheria (C. A. White, 1876) †
- Species Helix perlevis Shuttleworth, 1852
- Species Helix perlucens O. von Rosen, 1903 accepted as Fruticicola perlucens (O. von Rosen, 1903)
- Species Helix permellita Heude, 1886 accepted as Aegista permellita (Heude, 1886)
- Species Helix pernobilis A. Férussac, 1821 accepted as Hemiplecta pernobilis (A. Férussac, 1821)
- Species Helix peroteti Petit de la Saussaye, 1841 accepted as Perrottetia peroteti (Petit de la Saussaye, 1841)
- Species Helix perpaula W. H. Benson, 1859 accepted as Burmochlamys perpaula (W. H. Benson, 1859)
- Species Helix perplexa A. Férussac, 1832 accepted as Dentellaria perplexa (A. Férussac, 1832)
- Species Helix perplicata W. H. Benson, 1851 accepted as Lyrocystis perplicata (W. H. Benson, 1851)
- Species Helix perplicata A. Férussac, 1821 accepted as Pleurostemma perplicata (A. Férussac, 1821)
- Species Helix perraudierei Grasset, 1857 accepted as Hemicycla perraudierei (Grasset, 1857)
- Species Helix perrieri Mabille, 1882 † accepted as Hemicycla perrieri (Mabille, 1882) †
- Species Helix perrisii Noulet, 1854 †
- Species Helix perroquiniana Crosse, 1869 accepted as Platyrhytida perroquiniana (Crosse, 1869)
- Species Helix perrotteti L. Pfeiffer, 1851 accepted as Tanychlamys perrotteti (L. Pfeiffer, 1851)
- Species Helix perryi J. C. Jay, 1856 accepted as Euhadra quaesita quaesita (Deshayes, 1850)
- Species Helix persenecta Fagot, 1879
- Species Helix persimilis Deshayes, 1850 accepted as Helicostyla persimilis (Deshayes, 1850)
- Species Helix persimilis Shuttleworth, 1852
- Species Helix personata Lamarck, 1792 accepted as Isognomostoma isognomostomos (Schröter, 1784)
- Species Helix personnati Noulet, 1857 †
- Species Helix persordida Letourneux & Bourguignat, 1887 accepted as Schileykiella sordulenta (Morelet, 1851)
- Species Helix perspectiva Say, 1817 accepted as Discus patulus (Deshayes, 1832)
- Species Helix perspectiva Megerle von Mühlfeld, 1816 accepted as Discus perspectivus (Megerle von Mühlfeld, 1816)
- Species Helix perspicua Linnaeus, 1758 accepted as Lamellaria perspicua (Linnaeus, 1758)
- Species Helix pertenuis A. Gould, 1846 accepted as Philonesia pertenuis (A. Gould, 1846)
- Species Helix peruviana Lamarck, 1822 accepted as Macrocyclis peruvianus (Lamarck, 1822)
- Species Helix perversa Linnaeus, 1758 accepted as Amphidromus perversus (Linnaeus, 1758)
- Species Helix petasus W. H. Benson, 1859 accepted as Tanychlamys petasus (W. H. Benson, 1859)
- Species Helix petersi Reuss, 1849 † accepted as Praeoestophorella petersi (Reuss, 1849) †
- Species Helix petholata Olivi, 1792 accepted as Theba pisana (O. F. Müller, 1774)
- Species Helix petitiana A. d'Orbigny, 1841 accepted as Zachrysia petitiana (A. d'Orbigny, 1841)
- Species Helix petraea Montagu, 1803 accepted as Melarhaphe neritoides (Linnaeus, 1758)
- Species Helix petraea Ancey, 1884
- Species Helix petrobia W. H. Benson, 1851 accepted as Phaulocystis petrobia (W. H. Benson, 1851)
- Species Helix petrocoriensis Matheron, 1888 †
- Species Helix petronella L. Pfeiffer, 1853 accepted as Perpolita petronella (L. Pfeiffer, 1853)
- Species Helix petrosa T. Hutton, 1834 accepted as Tanychlamys petrosa (T. Hutton, 1834)
- Species Helix petterdi Legrand, 1871 accepted as Mulathena fordei (Brazier, 1871)
- Species Helix petterdiana J. W. Taylor, 1879 accepted as Scelidoropa officeri (Legrand, 1871)
- Species Helix pexa J. C. Cox, 1868 accepted as Discocharopa pexa (J. C. Cox, 1868)
- Species Helix pfeifferi R. A. Philippi, 1845 accepted as Irenella pfeifferi (R. A. Philippi, 1845)
- Species Helix phacodes Thomä, 1845 † accepted as Praeoestophorella phacodes (Thomä, 1845) †
- Species Helix phaedra Reeve, 1852 accepted as Levicepolis phaedra (Reeve, 1852)
- Species Helix phaeogramma L. Pfeiffer, 1846
- Species Helix phaeostoma L. Pfeiffer, 1877 accepted as Megalacron phaeostoma (L. Pfeiffer, 1877)
- Species Helix phaeozona E. von Martens, 1874 accepted as Fruticicola phaeozona (E. von Martens, 1874)
- Species Helix phalerata Rossmässler, 1836 accepted as Arianta chamaeleon (L. Pfeiffer, 1868)
- Species Helix phalerata P. B. Webb & S. Berthelot, 1833 accepted as Monilearia phalerata (P. B. Webb & S. Berthelot, 1833)
- Species Helix phaseolina Deshayes, 1851 † accepted as Leucochroopsis phaseolina (Deshayes, 1851) †
- Species Helix phasianus Röding, 1798 accepted as Phasianella australis (Gmelin, 1791)
- Species Helix phayrei Theobald, 1859 accepted as Aegista phayrei (Theobald, 1859)
- Species Helix phidias Hanley & Theobald, 1876 accepted as Euplecta phidias (Hanley & Theobald, 1876)
- Species Helix philibensis L. Pfeiffer, 1859 accepted as Helix pathetica Mousson, 1854
- Species Helix philibinensis Rossmässler, 1839
- Species Helix phillipii J. E. Gray, 1834 accepted as Advena phillipii (J. E. Gray, 1834)
- Species Helix phillipsiana Angas, 1873 accepted as Pleuroxia phillipsiana (Angas, 1873)
- Species Helix philoscia Bourguignat, 1881 † accepted as Paradrobacia philoscia (Bourguignat, 1881) †
- Species Helix philoxera Cafici, 1884
- Species Helix philyrina Morelet, 1851 accepted as Caldwellia philyrina (Morelet, 1851)
- Species Helix phlebophora R. T. Lowe, 1831 accepted as Leptaxis nivosa (G. B. Sowerby I, 1824)
- Species Helix phlogera A. d'Orbigny, 1835 accepted as Orthalicus phlogerus (A. d'Orbigny, 1835)
- Species Helix phlogophora L. Pfeiffer, 1850 accepted as Flammulina zebra (Le Guillou, 1842)
- Species Helix phloiodes L. Pfeiffer, 1843 accepted as Anixa phloiodes (L. Pfeiffer, 1843)
- Species Helix phlomiphila Mabille, 1881 accepted as Candidula gigaxii (L. Pfeiffer, 1847)
- Species Helix phlyaria Mabille, 1887 accepted as Gudeodiscus (Gudeodiscus) phlyarius (Mabille, 1887)
- Species Helix phocaea J. R. Roth, 1856 accepted as Josephinella phocaea (J. R. Roth, 1855)
- Species Helix phoenix L. Pfeiffer, 1854 accepted as Acavus phoenix (L. Pfeiffer, 1854)
- Species Helix phonica Mabille, 1887 accepted as Ganesella phonica (Mabille, 1887)
- Species Helix phorochaetia Bourguignat, 1864 accepted as Trochulus phorochaetia (Bourguignat, 1864)
- Species Helix phragmitum Heude, 1882
- Species Helix phryganophila Mabille, 1882 accepted as Cernuella virgata (Da Costa, 1778)
- Species Helix phrygica P. Fischer, 1866 †
- Species Helix phryne L. Pfeiffer, 1862
- Species Helix phthisica L. Pfeiffer, 1856 accepted as Papuina vexillaris (L. Pfeiffer, 1855)
- Species Helix phyllophaga Heude, 1882
- Species Helix phyllophila W. H. Benson, 1863 accepted as Sitala phyllophila (W. H. Benson, 1863)
- Species Helix physalis L. Pfeiffer, 1871 accepted as Chloraea physalis (L. Pfeiffer, 1871)
- Species Helix phytostylus W. H. Benson, 1864 accepted as Sheldonia phytostylus (W. H. Benson, 1864)
- Species Helix piatigorkiensis Mousson, 1861 accepted as Kalitinaia crenimargo (L. Pfeiffer, 1848)
- Species Helix picaena Tiberi, 1878 accepted as Marmorana signata tetrazona (De Cristofori & Jan, 1832)
- Species Helix picea Rossmässler, 1837 accepted as Arianta arbustorum picea (Rossmässler, 1837)
- Species Helix picta Born, 1778 accepted as Polymita picta (Born, 1778)
- Species Helix pictilis Tate, 1878 accepted as Magilaoma penolensis (J. C. Cox, 1868)
- Species Helix pictonum Bourguignat, 1882 accepted as Xeroplexa intersecta (Poiret, 1801)
- Species Helix picturata C. B. Adams, 1849 accepted as Dentellaria picturata (C. B. Adams, 1849)
- Species Helix picturata Poey, 1853 accepted as Hemitrochus lucipeta (Poey, 1854)
- Species Helix pila C. B. Adams, 1849 accepted as Sagda pila (C. B. Adams, 1849)
- Species Helix pilari Brusina, 1902 †
- Species Helix pileolus A. Férussac, 1821 accepted as Papuina pileolus (A. Férussac, 1821)
- Species Helix pileus O. F. Müller, 1774 accepted as Papuina pileus (O. F. Müller, 1774)
- Species Helix pilidion W. H. Benson, 1860
- Species Helix pilifera E. von Martens, 1869 accepted as Urguessella pilifera (E. von Martens, 1869)
- Species Helix piligera Gredler, 1885
- Species Helix pilisparsa E. von Martens, 1885 accepted as Trachia pilisparsa (E. von Martens, 1885)
- Species Helix pilosa von Alten, 1812
- Species Helix pilula Reeve, 1852 accepted as Phenacohelix pilula (Reeve, 1852)
- Species Helix pinacis W. H. Benson, 1859 accepted as Endothyrella pinacis (W. H. Benson, 1859)
- Species Helix pinchoniana Heude, 1886 accepted as Coccoglypta pinchoniana (Heude, 1886)
- Species Helix pinguis Krauss, 1848 accepted as Thapsia pinguis (Krauss, 1848)
- Species Helix pinicola Reeve, 1854 accepted as Andrefrancia pinicola (Reeve, 1854)
- Species Helix pinnocki Liardet, 1876 accepted as Coneuplecta calculosa (A. Gould, 1852)
- Species Helix pirajnea Benoit, 1859
- Species Helix pirrieana Reeve, 1854 accepted as Philalanka pirrieana (Reeve, 1854)
- Species Helix pirrienana Reeve, 1854
- Species Helix pisana O. F. Müller, 1774 accepted as Theba pisana (O. F. Müller, 1774)
- Species Helix pisaniformis Bourguignat, 1881 accepted as Eremina desertella (Jickeli, 1872)
- Species Helix pisanopsis Servain, 1880
- Species Helix pisiformis L. Pfeiffer, 1846 accepted as Diplobursa pisiformis (L. Pfeiffer, 1846)
- Species Helix pisum Matheron, 1843 † accepted as Leucochroopsis pisum (Matheron, 1843) †
- Species Helix pisum F. A. Roemer, 1836 † accepted as Turbo pisum (F. A. Roemer, 1836) †
- Species Helix pittae Paiva, 1866 accepted as Caseolus pittae (Paiva, 1866)
- Species Helix pityonesica L. Pfeiffer, 1854 accepted as Jeanneretia bicincta pityonesica (L. Pfeiffer, 1854)
- Species Helix placida Shuttleworth, 1852 accepted as Plagyrona placida (Shuttleworth, 1852)
- Species Helix plagioglossa L. Pfeiffer, 1859 accepted as Polygyra plagioglossa (L. Pfeiffer, 1859)
- Species Helix plagioptycha Shuttleworth, 1854 accepted as Lyroconus plagioptycha (Shuttleworth, 1854)
- Species Helix plagiostoma L. Pfeiffer, 1856 accepted as Papuina plagiostoma (L. Pfeiffer, 1856)
- Species Helix plana Ijima, 1891 accepted as Ainohelix editha (A. Adams, 1868)
- Species Helix plana Dunker, 1843 accepted as Polygyra plana (Dunker, 1843)
- Species Helix planasi Hidalgo, 1890 accepted as Ganesella planasi (Hidalgo, 1890)
- Species Helix planata Maton & Rackett, 1807 accepted as Planorbis carinatus O. F. Müller, 1774
- Species Helix planata A. Férussac, 1821 accepted as Theba subdentata helicella (W. Wood, 1828)
- Species Helix planella L. Pfeiffer, 1853 accepted as Oxychilus planellus (L. Pfeiffer, 1853)
- Species Helix planibasis Brazier, 1881 accepted as Sphaerospira rockhamptonensis (J. C. Cox, 1873)
- Species Helix planissima L. Pfeiffer, 1845
- Species Helix planiuscula W. H. Benson, 1838 accepted as Tanychlamys planiuscula (W. H. Benson, 1838)
- Species Helix planorbella Lamarck, 1816 accepted as Hemicycla planorbella (Lamarck, 1816)
- Species Helix planorbis Linnaeus, 1758 accepted as Planorbis planorbis (Linnaeus, 1758)
- Species Helix planorbis R. P. Lesson, 1831 accepted as Trochomorpha froggatti (Iredale, 1941)
- Species Helix planorboides A. Férussac, 1821 accepted as Haplotrema concavum (Say, 1821)
- Species Helix planorboides A. Férussac, 1832 accepted as Haplotrema concavum (Say, 1821)
- Species Helix planorbula Lamarck, 1822 accepted as Polygyra septemvolva Say, 1818
- Species Helix planospira Lamarck, 1822 accepted as Campylaea planospira (Lamarck, 1822)
- Species Helix planti Reeve, 1854 accepted as Chilocystis loveni (Krauss, 1848)
- Species Helix planulata Lamarck, 1822 accepted as Obba planulata (Lamarck, 1822)
- Species Helix planulata Anton, 1838
- Species Helix platae Maton, 1811 accepted as Asolene platae (Maton, 1811)
- Species Helix platonis L. Pfeiffer, 1866 accepted as Plagioptycha platonis (L. Pfeiffer, 1866)
- Species Helix platti L. Pfeiffer, 1855 accepted as Helix planti Reeve, 1854
- Species Helix platychela Menke, 1830 accepted as Marmorana platychela platychela (Menke, 1830)
- Species Helix platychilos Megerle von Mühlfeld, 1824 accepted as Helicina platychila (Megerle von Mühlfeld, 1824)
- Species Helix platygyra Albers, 1857 accepted as Systrophia platygyra (Albers, 1857)
- Species Helix platylasia Castro, 1887 accepted as Ponentina platylasia (Castro, 1887)
- Species Helix platyodon L. Pfeiffer, 1846 accepted as Camaenella platyodon (L. Pfeiffer, 1846)
- Species Helix platyomphala Möllendorff, 1885 accepted as Aegista platyomphala (Möllendorff, 1885)
- Species Helix platystyla L. Pfeiffer, 1850 accepted as Dialeuca conspersula platystyla (L. Pfeiffer, 1850)
- Species Helix plebeia Michaud, 1831
- Species Helix plebeium Draparnaud, 1805 accepted as Trochulus hispidus (Linnaeus, 1758)
- Species Helix plectilis W. H. Benson, 1853 accepted as Plectorhagada plectilis (W. H. Benson, 1853)
- Species Helix plectostoma W. H. Benson, 1836 accepted as Endothyrella plectostoma (W. H. Benson, 1836)
- Species Helix plectotropis E. von Martens, 1864 accepted as Fruticicola plectotropis (E. von Martens, 1864)
- Species Helix plesiasteia Bourguignat, 1884 accepted as Otala lactea (O. F. Müller, 1774)
- Species Helix plethorica Crosse, 1868
- Species Helix pleuradra Bourguignat, 1881 † accepted as Discus pleuradrus (Bourguignat, 1881) †
- Species Helix pleurestha Berthier, 1884 accepted as Xerocrassa geyeri (Soós, 1926)
- Species Helix pleurophora S. Moricand, 1846 accepted as Lilloiconcha pleurophora (S. Moricand, 1846)
- Species Helix plicaria Born, 1778 accepted as Stenomelania plicaria (Born, 1778)
- Species Helix plicaria Lamarck, 1816 accepted as Hemicycla plicaria (Lamarck, 1816)
- Species Helix plicata Born, 1778 accepted as Labyrinthus plicatus (Born, 1778)
- Species Helix plicata Born, 1778 accepted as Stenomelania plicaria (Born, 1778)
- Species Helix plicatella Reuss, 1849 † accepted as Spermodea plicatella (Reuss, 1849) †
- Species Helix plicatilis Deshayes, 1870
- Species Helix pliculosa L. Pfeiffer, 1857
- Species Helix plurizonata A. Adams & Reeve, 1850 accepted as Canefriula plurizonata (A. Adams & Reeve, 1850)
- Species Helix pluto L. Pfeiffer, 1863 accepted as Hemiplecta pluto (L. Pfeiffer, 1863)
- Species Helix poecila A. d'Orbigny, 1835 accepted as Drymaeus poecilus (A. d'Orbigny, 1835)
- Species Helix poecilocostata L. Pfeiffer, 1854 accepted as Phrixgnathus poecilostictus (Reeve, 1852)
- Species Helix poecilosticta L. Pfeiffer, 1853 accepted as Phrixgnathus poecilostictus (Reeve, 1852)
- Species Helix poecilosticta Reeve, 1852 accepted as Phrixgnathus poecilostictus (Reeve, 1852)
- Species Helix poeyi Petit de la Saussaye, 1836 accepted as Cepolis poeyi (Petit de la Saussaye, 1836)
- Species Helix poiretiana Reeve, 1852 accepted as Noctepuna poiretiana (Reeve, 1852)
- Species Helix poirieri Tapparone Canefri, 1878 accepted as Papuina blanfordiana (H. Adams, 1869)
- Species Helix poirrieri Mabille, 1882 accepted as Hemicycla bidentalis bidentalis (Lamarck, 1822)
- Species Helix polillensis L. Pfeiffer, 1861 accepted as Calocochlea polillensis (L. Pfeiffer, 1861)
- Species Helix politissima Reeve, 1854 accepted as Ravana politissima (Reeve, 1854)
- Species Helix politula de Boissy, 1840 † accepted as Canariella politula (de Boissy, 1840) †
- Species Helix pollenzensis Hidalgo, 1878 accepted as Xerocrassa pollenzensis (Hidalgo, 1878)
- Species Helix pollinii Da Campo, 1849 accepted as Helix cincta O. F. Müller, 1774
- Species Helix pollodonta A. d'Orbigny, 1835 accepted as Systrophia pollodonta (A. d'Orbigny, 1835)
- Species Helix pollonerae Paravicini, 1894 accepted as Epiphragmophora pollonerae (Paravicini, 1894)
- Species Helix pollux Theobald, 1858 accepted as Oxytesta pollux (Theobald, 1858)
- Species Helix polychroa A. Binney, 1851 accepted as Hemitrochus varians (Menke, 1829)
- Species Helix polychroa G. B. Sowerby I, 1841 accepted as Cochlodryas viridostriata (I. Lea, 1840)
- Species Helix polycycla Morelet, 1860 accepted as Systrophia polycycla (Morelet, 1860)
- Species Helix polydora Mabille, 1884
- Species Helix polygyrata Born, 1778 accepted as Polygyratia polygyrata (Born, 1778)
- Species Helix polygyrella Bland & J. G. Cooper, 1861 accepted as Polygyrella polygyrella (Bland & J. G. Cooper, 1861)
- Species Helix polymorpha A. d'Orbigny, 1835 accepted as Bocourtia bicolor (G. B. Sowerby I, 1835)
- Species Helix polyodon G. B. Sowerby I, 1844 accepted as Helenoconcha polyodon (G. B. Sowerby I, 1844)
- Species Helix polypleura Bourguignat, 1881 † accepted as Hemicycla asperula leymerieana (Noulet, 1854) †
- Species Helix polypleuris W. T. Blanford, 1865 accepted as Rahula polypleuris (W. T. Blanford, 1865)
- Species Helix polyzonalis Lamarck, 1822 accepted as Helicophanta magnifica (A. Férussac, 1819)
- Species Helix pomacella Mousson, 1854
- Species Helix pomaria O. F. Müller, 1774 accepted as Helix pomatia Linnaeus, 1758
- Species Helix pomatella Kobelt, 1876
- Species Helix pomatia Linnaeus, 1758
- Species Helix pompylia Shuttleworth, 1852 accepted as Janulus pompylius (Shuttleworth, 1852)
- Species Helix pomum L. Pfeiffer, 1842 accepted as Xanthomelon durvillii (Hombron & Jacquinot, 1841)
- Species Helix pomumadami Green, 1834 accepted as Gastrodonta interna (Say, 1821)
- Species Helix ponderosa L. Pfeiffer, 1845 accepted as Calocochlea ponderosa (L. Pfeiffer, 1845)
- Species Helix pondicheriensis L. Pfeiffer, 1841
- Species Helix ponentina Morelet, 1845 accepted as Ponentina ponentina (Morelet, 1845)
- Species Helix ponsi Hidalgo, 1878 accepted as Xerocrassa homeyeri ponsi (Hidalgo, 1878)
- Species Helix ponsonbyana Pilsbry, 1895 accepted as Ponentina ponsonbyana (Pilsbry, 1895)
- Species Helix ponsonbyi Westerlund, 1888 accepted as Ponentina ponsonbyana (Pilsbry, 1895)
- Species Helix ponsonbyi Kobelt, 1882
- Species Helix pontica P. Fischer, 1866 † accepted as Monacha pontica (P. Fischer, 1866) †
- Species Helix poongee Theobald, 1859 accepted as Burmochlamys poongee (Theobald, 1859)
- Species Helix porcaria Mabille, 1884
- Species Helix porcellana L. Pfeiffer, 1859 accepted as Planispira infracta (E. von Martens, 1896)
- Species Helix porcellana Grateloup, 1840 accepted as Laevicepolis porcellana (Grateloup, 1840)
- Species Helix porcina Say, 1824 accepted as Stenotrema hirsutum (Say, 1817)
- Species Helix porphyria L. Pfeiffer, 1842 accepted as Lamarckiella porphyria (L. Pfeiffer, 1842)
- Species Helix porteri J. C. Cox, 1866 accepted as Austrochloritis porteri (J. C. Cox, 1866)
- Species Helix portia J. E. Gray, 1850 accepted as Phenacohelix ziczac (A. Gould, 1846)
- Species Helix portii L. Pfeiffer, 1861 accepted as Calocochlea polillensis (L. Pfeiffer, 1861)
- Species Helix portionalis Locard, 1899 accepted as Candidula olisippensis (Servain, 1880)
- Species Helix portoricensis L. Pfeiffer, 1847
- Species Helix portosanctanae G. B. Sowerby I, 1824 accepted as Pseudocampylaea portosanctanae (G. B. Sowerby I, 1824)
- Species Helix postelliana Bland, 1859 accepted as Daedalochila postelliana (Bland, 1859)
- Species Helix potiezii de Boissy, 1840 † accepted as Klikia potiezii (de Boissy, 1840) †
- Species Helix pouchet A. Férussac, 1821 accepted as Hemicycla pouchet (A. Férussac, 1821)
- Species Helix poupillieri Bourguignat, 1863 accepted as Paralaoma servilis (Shuttleworth, 1852)
- Species Helix pouzolzii Deshayes, 1832 accepted as Dinarica pouzolzii (Deshayes, 1832)
- Species Helix powisiana L. Pfeiffer, 1848 accepted as Guestieria powisiana (L. Pfeiffer, 1848)
- Species Helix praecellens Nägele, 1901 accepted as Amanica praecellens (Nägele, 1901)
- Species Helix praedepressula Fontannes, 1879 † accepted as Helicella (Jacosta) praedepressula (Fontannes, 1879) †
- Species Helix praelongata Pallary, 1898
- Species Helix praeposita Mousson, 1872 accepted as Monilearia praeposita (Mousson, 1872)
- Species Helix praestans Reeve, 1854 accepted as Solaropsis praestans (Reeve, 1854)
- Species Helix praetexta L. Pfeiffer, 1871 accepted as Liburnica insolita ventricosa (A. J. Wagner, 1914)
- Species Helix praetumida Morelet, 1860 accepted as Pilula praetumida (Morelet, 1860)
- Species Helix prasina F. C. L. Koch, 1844 accepted as Chloraea dryope (Broderip, 1841)
- Species Helix prasinata J. R. Roth, 1855 accepted as Helix engaddensis Bourguignat, 1852
- Species Helix pratensis L. Pfeiffer, 1846 accepted as Hesseola pratensis (L. Pfeiffer, 1846)
- Species Helix praviata Locard, 1894 † accepted as Trochulus hispidus (Linnaeus, 1758)
- Species Helix preslii Rossmässler, 1836 accepted as Chilostoma colubrinum preslii (Rossmässler, 1836)
- Species Helix pressula Morelet, 1851 accepted as Trichodiscina suturalis pressula (Morelet, 1851)
- Species Helix prestwichii Deshayes, 1863 † accepted as Loganiopharynx rarus (de Boissy, 1840) †
- Species Helix pretiosa Albers, 1850 accepted as Plectotropis elegantissima (L. Pfeiffer, 1849)
- Species Helix prevostiana Crosse, 1874 accepted as Rhytidopsis prevostiana (Crosse, 1874)
- Species Helix priamus Gmelin, 1791 accepted as Ampulla priamus (Gmelin, 1791)
- Species Helix prietoi Hidalgo, 1878 accepted as Xerocrassa prietoi (Hidalgo, 1878)
- Species Helix primaeva Morelet, 1873 accepted as Eremina primaeva (Morelet, 1873)
- Species Helix primeana Crosse, 1864 accepted as Bradybaena circulus circulus (L. Pfeiffer, 1846)
- Species Helix princei Liardet, 1876 accepted as Sinployea princei (Liardet, 1876)
- Species Helix princeps Reeve, 1854 accepted as Calocochlea princeps (Reeve, 1854)
- Species Helix prionacis W. H. Benson, 1864 accepted as Lyrocystis prionacis (W. H. Benson, 1864)
- Species Helix prionotospira Mabille, 1883
- Species Helix probata Mabille, 1898
- Species Helix problematica L. Pfeiffer, 1852
- Species Helix proboscidea L. Pfeiffer, 1856 accepted as Zachrysia proboscidea (L. Pfeiffer, 1856)
- Species Helix procera Reeve, 1854 accepted as Isomeria oreas (F. C. L. Koch, 1844)
- Species Helix procumbens A. Gould, 1843 accepted as Bouchetcamaena procumbens (A. Gould, 1843)
- Species Helix profuga A. Schmidt, 1854 accepted as Cernuella cisalpina (Rossmässler, 1837)
- Species Helix profunda Say, 1821 accepted as Allogona profunda (Say, 1821)
- Species Helix proletaria Morelet, 1860 accepted as Dupontia proletaria (Morelet, 1860)
- Species Helix promaeca Bourguignat, 1882 accepted as Helix pomatia Linnaeus, 1758
- Species Helix pronuba Westerlund, 1879
- Species Helix propenuda C. B. Adams, 1850 accepted as Dentellaria sinuata (O. F. Müller, 1774)
- Species Helix prophetarum Bourguignat, 1852 accepted as Sphincterochila prophetarum (Bourguignat, 1852)
- Species Helix propinqua L. Pfeiffer, 1857 accepted as Chloritis propinqua (L. Pfeiffer, 1857)
- Species Helix proserpina L. Pfeiffer, 1845 accepted as Proserpina nitida G. B. Sowerby II, 1839
- Species Helix proserpinula L. Pfeiffer, 1852 accepted as Proserpinula discoidea (C. B. Adams, 1850)
- Species Helix prospera Albers, 1857 accepted as Acavus haemastoma (Linnaeus, 1758)
- Species Helix prostrata Pease, 1865 accepted as Menetus opercularis (A. Gould, 1847)
- Species Helix protea Rossmassler, 1838 accepted as Helicella (Xeropicta) protea (Rossmassler, 1838)
- Species Helix protocaenica Stache, 1889 †
- Species Helix protumida Locard, 1899 accepted as Candidula olisippensis (Servain, 1880)
- Species Helix provincialis Benoit, 1843
- Species Helix provisoria L. Pfeiffer, 1858 accepted as Zachrysia provisoria (L. Pfeiffer, 1858)
- Species Helix proxima A. Férussac, 1832 accepted as Trachia proxima (A. Férussac, 1832)
- Species Helix prshewalskii E. von Martens, 1881
- Species Helix pruinosa Reeve, 1852 accepted as Thysanophora pruinosa (Reeve, 1852)
- Species Helix prunum A. Férussac, 1821
- Species Helix przewalskii E. von Martens, 1882 accepted as Cathaica przewalskii (E. von Martens, 1882)
- Species Helix psammaecia Bourguignat, 1862 †
- Species Helix psammicola Mabille, 1898
- Species Helix psammoica Morelet, 1851 accepted as Helicella psammoica (Morelet, 1851)
- Species Helix psathyropsis Mabille, 1882
- Species Helix pseudobuliminus Heude, 1882 accepted as Pseudobuliminus pseudobuliminus (Heude, 1882)
- Species Helix pseudochinensis Möllendorff, 1884
- Species Helix pseudoconspurcata Matheron, 1843 † accepted as Leucochroopsis dufrenoyii (Matheron, 1843) †
- Species Helix pseudoglobosa A. d'Orbigny, 1850 † accepted as Megalocochlea pseudoglobosa (A. d'Orbigny, 1850) †
- Species Helix pseudohyalinia Sacco, 1886 † accepted as Soosia taramellii (Sacco, 1886) †
- Species Helix pseudolabium L. Pfeiffer, 1868 accepted as Papuina pseudolabium (L. Pfeiffer, 1868)
- Species Helix pseudoleioda Suter, 1890 accepted as Huonodon pseudoleiodon (Suter, 1890)
- Species Helix pseudoligata Sinzov, 1897 †
- Species Helix pseudomeadei Bednall, 1876 accepted as Xanthomelon jannellei (Le Guillou, 1842)
- Species Helix pseudomiara Bavay & Dautzenberg, 1909 accepted as Trichochloritis pseudomiara (Bavay & Dautzenberg, 1909)
- Species Helix pseudoplanorbis Lubomirski, 1880 accepted as Systrophia pseudoplanorbis (Lubomirski, 1880)
- Species Helix pseudosericea Benoit, 1859
- Species Helix pseudosuccinea S. Moricand, 1836 accepted as Simpulopsis pseudosuccinea (S. Moricand, 1836)
- Species Helix psiloritana Maltzan, 1883 accepted as Xerocrassa mesostena (Westerlund, 1879)
- Species Helix psittacina Deshayes, 1861 accepted as Chloraea psittacina (Deshayes, 1861)
- Species Helix pthonera Mabille, 1883 accepted as Canariella pthonera (Mabille, 1883)
- Species Helix ptychodes L. Pfeiffer, 1846 accepted as Corneosagda ptychodes (L. Pfeiffer, 1846)
- Species Helix ptychodia Bourguignat, 1864
- Species Helix ptychomphala Reeve, 1852 accepted as Briansmithia ptychomphala (Reeve, 1852)
- Species Helix ptychophora A. D. Brown, 1870 accepted as Allogona ptychophora (A. D. Brown, 1870)
- Species Helix ptychophorus
- Species Helix ptychostyla E. von Martens, 1860 accepted as Landouria ptychostyla (E. von Martens, 1860)
- Species Helix ptychostyla L. Pfeiffer, 1862 accepted as Thaitropis ptychostyloides Schileyko, 2011
- Species Helix puberosula Heude, 1885
- Species Helix puberula Heude, 1885 accepted as Trichochloritis puberula (Heude, 1885)
- Species Helix pubescens S. Moricand, 1846 accepted as Rhinus pubescens (S. Moricand, 1846)
- Species Helix pubescens L. Pfeiffer, 1853 accepted as Exsuavitas pubescens (L. Pfeiffer, 1853)
- Species Helix pudibunda J. C. Cox, 1868 accepted as Nitor pudibundus (J. C. Cox, 1868)
- Species Helix pudibunda H. Beck, 1837 accepted as Coryda alauda (A. Férussac, 1821)
- Species Helix pudica O. F. Müller, 1774 accepted as Strophocheilus pudicus (O. F. Müller, 1774)
- Species Helix puella Broderip, 1841 accepted as Chloraea puella (Broderip, 1841)
- Species Helix pulchella O. F. Müller, 1774 accepted as Vallonia pulchella (O. F. Müller, 1774)
- Species Helix pulchellula Heude, 1882 accepted as Vallonia pulchellula (Heude, 1882)
- Species Helix pulcherrima G. B. Sowerby I, 1841 accepted as Calocochlea pulcherrima (G. B. Sowerby I, 1841)
- Species Helix pulchrior C. B. Adams, 1851 accepted as Dialeuca subconica (C. B. Adams, 1845)
- Species Helix pulla Gmelin, 1791 accepted as Eurycratera jamaicensis (Gmelin, 1791)
- Species Helix pulveratricula E. von Martens, 1882 accepted as Pliocathaica pulveratricula (E. von Martens, 1882)
- Species Helix pulveratrix E. von Martens, 1882 accepted as Cathaica pulveratrix (E. von Martens, 1882)
- Species Helix pulverulenta Heude, 1885 accepted as Helix puberosula Heude, 1885
- Species Helix pulvisculum Issel, 1874 accepted as Pupisoma pulvisculum (Issel, 1874)
- Species Helix pumicata Morelet, 1875 accepted as Sarika pumicata (Morelet, 1875)
- Species Helix pumila Westerlund, 1892 accepted as Xerotricha vatonniana (Bourguignat, 1867)
- Species Helix punctata O. F. Müller, 1774 accepted as Otala punctata (O. F. Müller, 1774)
- Species Helix punctata J. A. Wagner, 1827 accepted as Solaropsis serpens (Spix, 1827)
- Species Helix punctigera Thomä, 1845 † accepted as Pseudomonacha punctigera (Thomä, 1845) †
- Species Helix punctulata G. B. Sowerby I, 1824 accepted as Caseolus punctulatus (G. B. Sowerby I, 1824)
- Species Helix punctum Morelet, 1851 accepted as Pupisoma dioscoricola (C. B. Adams, 1845)
- Species Helix punica Morelet, 1851 accepted as Massylaea punica (Morelet, 1851)
- Species Helix puntana Holmberg, 1909 accepted as Epiphragmophora puntana (Holmberg, 1909)
- Species Helix pupa Linnaeus, 1758 accepted as Mastus pupa (Linnaeus, 1758)
- Species Helix pupula A. Gould, 1859 accepted as Trochochlamys labilis labilis (A. Gould, 1859)
- Species Helix pupula A. Braun, 1851 † accepted as Pseudelix pupula (A. Braun, 1851) †
- Species Helix pura Alder, 1830 accepted as Aegopinella pura (Alder, 1830)
- Species Helix purchasi L. Pfeiffer, 1858 accepted as Crystallopsis purchasi (L. Pfeiffer, 1858)
- Species Helix purpuragula I. Lea, 1834 accepted as Coryda alauda (A. Férussac, 1821)
- Species Helix purpurascens Reeve, 1854
- Species Helix purpurea Gmelin, 1791 accepted as Cantharidus purpureus (Gmelin, 1791)
- Species Helix purpurostoma Le Guillou, 1842
- Species Helix pusilla sensu Vermeulen & Whitten, 1998 accepted as Durgella dwipana (Gude, 1903)
- Species Helix pusilla Vallot, 1801 accepted as Pyramidula pusilla (Vallot, 1801)
- Species Helix pusilla L. Pfeiffer, 1839 accepted as Guppya gundlachii (L. Pfeiffer, 1840)
- Species Helix pusilla F. A. Roemer, 1836 † accepted as Helicocryptus pusillus (F. A. Roemer, 1836) †
- Species Helix pusilla R. T. Lowe, 1831 accepted as Paralaoma servilis (Shuttleworth, 1852)
- Species Helix pusillus A. Gould, 1846 accepted as Nesovitrea pauxilla (A. Gould, 1852)
- Species Helix pustula A. Férussac, 1832 accepted as Lobosculum pustula (A. Férussac, 1832)
- Species Helix pustuloides Bland, 1858 accepted as Lobosculum pustuloides (Bland, 1858)
- Species Helix pustulosa Mousson, 1859 accepted as Cernuella jonica (Mousson, 1854)
- Species Helix puteolus W. H. Benson, 1853 accepted as Ruthvenia clathratula (L. Pfeiffer, 1850)
- Species Helix putilla Locard, 1899 accepted as Candidula olisippensis (Servain, 1880)
- Species Helix putonii Clessin, 1874 accepted as Trochulus clandestinus putonii (Clessin, 1874)
- Species Helix putrescens R. T. Lowe, 1861 accepted as Canaridiscus putrescens (R. T. Lowe, 1861)
- Species Helix putris Linnaeus, 1758 accepted as Succinea putris (Linnaeus, 1758)
- Species Helix pyantha Mabille, 1889
- Species Helix pycnia Bourguignat, 1860 accepted as Helix engaddensis Bourguignat, 1852
- Species Helix pygmaeum Draparnaud, 1801 accepted as Punctum pygmaeum (Draparnaud, 1801)
- Species Helix pylaica W. H. Benson, 1856 accepted as Sesara pylaica (W. H. Benson, 1856)
- Species Helix pyramidalis G. B. Sowerby I, 1841
- Species Helix pyramidalis de Serres, 1844 † accepted as Palaeoxestina villaenovae (Noulet, 1868) †
- Species Helix pyramidata Draparnaud, 1805 accepted as Trochoidea pyramidata (Draparnaud, 1805)
- Species Helix pyramidella (Spix, 1827) accepted as Oxychona pyramidella (Spix, 1827)
- Species Helix pyramidella de Cristofori & Jan, 1832
- Species Helix pyramis R. A. Philippi, 1836
- Species Helix pyrenaica Draparnaud, 1805 accepted as Norelona pyrenaica (Draparnaud, 1805)
- Species Helix pyrgia Bourguignat, 1882 accepted as Helix pomatia Linnaeus, 1758
- Species Helix pyrostoma A. Férussac, 1821 accepted as Pyrochilus pyrostoma (A. Férussac, 1821)
- Species Helix pyrrhae Eichwald, 1830 † accepted as Oxychilus flavus (Eichwald, 1830) †
- Species Helix pyrrhozona R. A. Philippi, 1845 accepted as Cathaica pyrrhozona (R. A. Philippi, 1845)
- Species Helix pyrum Gmelin, 1791 accepted as Columna columna (O. F. Müller, 1774)
- Species Helix pythogaster Donovan, 1824 accepted as Helicostyla pithogaster (A. Férussac, 1821)
- Species Helix pythonissa Tapparone Canefri, 1883
- Species Helix pyxis Hinds, 1845
- Species Helix quadrasi Hidalgo, 1885 accepted as Atenia quadrasi (Hidalgo, 1885)
- Species Helix quadricincta Morelet, 1864 accepted as Hemicycla quadricincta (Morelet, 1864)
- Species Helix quadridens O. F. Müller, 1774 accepted as Jaminia quadridens (O. F. Müller, 1774)
- Species Helix quadridentata Blanckenhorn, 1901 †
- Species Helix quadridentata (Broderip, 1832) accepted as Labyrinthus quadridentatus (Broderip, 1832)
- Species Helix quadrifasciata de Serres, 1851 † accepted as Frechenia serresi H. Nordsieck, 2017 †
- Species Helix quadrifasciata Le Guillou, 1842 accepted as Planispira quadrifasciata (Le Guillou, 1842)
- Species Helix quadrifasciata F. Sandberger, 1872 † accepted as Palaeotachea subsulcosa (Thomä, 1845) †
- Species Helix quadrispira E. von Martens, 1864
- Species Helix quadrivittata Hidalgo, 1869 accepted as Solaropsis quadrivittata (Hidalgo, 1869)
- Species Helix quadrivolvis E. von Martens, 1865 accepted as Chloritis quadrivolvis (E. von Martens, 1865)
- Species Helix quaesita Deshayes, 1850 accepted as Euhadra quaesita (Deshayes, 1850)
- Species Helix quedenfeldti E. von Martens, 1890
- Species Helix quercina L. Pfeiffer, 1857 accepted as Chloritis quercina (L. Pfeiffer, 1857)
- Species Helix quietus Reeve, 1851 accepted as Chloritis quieta (Reeve, 1851)
- Species Helix quimperiana Blainville, 1821 accepted as Elona quimperiana (Blainville, 1821)
- Species Helix quintalae J. C. Cox, 1870 accepted as Allenoconcha quintalae (J. C. Cox, 1870)
- Species Helix quintanellensis Roman, 1907 † accepted as Theba quintanellensis (Roman, 1907) †
- Species Helix quirosi J. C. Cox, 1873
- Species Helix quitensis Reeve, 1854
- Species Helix quitensis L. Pfeiffer, 1855 accepted as Helix quitensis Reeve, 1854
- Species Helix quoyi Deshayes, 1838 accepted as Obba quoyi (Deshayes, 1838)
- Species Helix rabdischura Mabille, 1883
- Species Helix rachiodia Bourguignat, 1863 accepted as Metafruticicola berytensis (L. Pfeiffer, 1841)
- Species Helix radama R. P. Lesson, 1826 accepted as Ampelita madagascariensis (Lamarck, 1816)
- Species Helix radians L. Pfeiffer, 1853 accepted as Hiona radians (L. Pfeiffer, 1853)
- Species Helix radiaria Reeve, 1854 accepted as Serpho kivi (J. E. Gray, 1843)
- Species Helix radiatula Alder, 1830 accepted as Retinella radiatula (Alder, 1830)
- Species Helix radicicola W. H. Benson, 1848 accepted as Bradybaena radicicola (W. H. Benson, 1848)
- Species Helix radicicola W. H. Benson, 1859
- Species Helix radiella L. Pfeiffer, 1846 accepted as Australdonta radiella (L. Pfeiffer, 1846)
- Species Helix radigueli Bourguignat, 1869 † accepted as Candidula radigueli (Bourguignat, 1869) †
- Species Helix radiolata Morelet, 1882 accepted as Psichion radiolatum (Morelet, 1882)
- Species Helix radiosa Rossmässler, 1838 accepted as Helix lucorum Linnaeus, 1758
- Species Helix radula L. Pfeiffer, 1844 accepted as Glyptobensonia radula (L. Pfeiffer, 1844)
- Species Helix radula F. Sandberger, 1870 † accepted as Prothelidomus acrochordon (Oppenheim, 1890) †
- Species Helix radulella Heude, 1885
- Species Helix radulina Heude, 1888
- Species Helix raffrayana T. D. A. Cockerell, 1888 accepted as Helix peracanthoda Bourguignat, 1883
- Species Helix raffrayi Tapparone Canefri, 1878 accepted as Calostropha raffrayi (Tapparone Canefri, 1878)
- Species Helix raffrayi Bourguignat, 1883 accepted as Helix peracanthoda Bourguignat, 1883
- Species Helix rafinesquea A. Férussac, 1821 accepted as Ventridens ligera (Say, 1821)
- Species Helix rafinesquia A. Férussac, 1821 accepted as Ventridens ligera (Say, 1821)
- Species Helix rahtii Thomä, 1845 † accepted as Metacampylaea rahtii (Thomä, 1845) †
- Species Helix raimondii R. A. Philippi, 1867 accepted as Labyrinthus raimondii (R. A. Philippi, 1867)
- Species Helix rainbirdi J. C. Cox, 1870 accepted as Marilynessa yulei (Forbes, 1852)
- Species Helix rallus Röding, 1798 accepted as Buccinum zebra O. F. Müller, 1774
- Species Helix ramburi Mabille, 1867 accepted as Candidula gigaxii (L. Pfeiffer, 1847)
- Species Helix ramentosa A. Gould, 1856 accepted as Helminthoglypta nickliniana ramentosa (A. Gould, 1856)
- Species Helix ramondi Brongniart, 1810 † accepted as Wenzia ramondi (Brongniart, 1810) †
- Species Helix ramonis A. d'Orbigny, 1841 accepted as Polygyra lingulata (Deshayes, 1839)
- Species Helix ramsayi J. C. Cox, 1868 accepted as Strangesta ramsayi (J. C. Cox, 1868)
- Species Helix ramsdeni Angas, 1876 accepted as Papuina ambrosia (Angas, 1867)
- Species Helix rangelina L. Pfeiffer, 1854 accepted as Zachrysia rangelina (L. Pfeiffer, 1854)
- Species Helix rangiana Michaud, 1831 accepted as Mastigophallus rangianus (Michaud, 1831)
- Species Helix rangii R. P. Lesson, 1831 accepted as Figuladra lessoni (L. Pfeiffer, 1846)
- Species Helix rapida L. Pfeiffer, 1853 accepted as Hebridelos rapida (L. Pfeiffer, 1853)
- Species Helix rara de Boissy, 1840 † accepted as Loganiopharynx rarus (de Boissy, 1840) †
- Species Helix rareguttata Mousson, 1849 accepted as Asperitas trochus (O. F. Müller, 1774)
- Species Helix raripila F. Sandberger, 1873 † accepted as Trochulus hispidus (Linnaeus, 1758)
- Species Helix raripila Morelet, 1851 accepted as Suavitas raripila (Morelet, 1851)
- Species Helix rariplicata L. Pfeiffer, 1849 accepted as Trachycystis rariplicata (L. Pfeiffer, 1849)
- Species Helix rarissima Klika, 1891 † accepted as Archaeozonites rarissimus (Klika, 1891) †
- Species Helix raspailii Payraudeau, 1826 accepted as Tacheocampylaea raspailii (Payraudeau, 1826)
- Species Helix raulini Noulet, 1854 † accepted as Pseudoleptaxis raulini (Noulet, 1854) †
- Species Helix ravergiensis A. Férussac, 1835 accepted as Harmozica ravergiensis (A. Férussac, 1835)
- Species Helix ravida W. H. Benson, 1842 accepted as Acusta ravida (W. H. Benson, 1842)
- Species Helix ravidula Heude, 1882 accepted as Bradybaena ravidula (Heude, 1882)
- Species Helix rawnesleyi J. C. Cox, 1873 accepted as Steorra rawnesleyi (J. C. Cox, 1873)
- Species Helix raymondii Saint-Simon, 1848 accepted as Gyrostomella raymondii (Saint-Simon, 1848)
- Species Helix raynali Gassies, 1863 accepted as Ouagapia raynali (Gassies, 1863)
- Species Helix rebellis Heude, 1885
- Species Helix reboudiana Bourguignat, 1863 accepted as Xerosecta reboudiana (Bourguignat, 1863)
- Species Helix reboulii Leufroy, 1828 † accepted as Cepaea reboulii (Leufroy, 1828) †
- Species Helix rechodia Bourguignat, 1862 † accepted as Candidula rechodia (Bourguignat, 1862) †
- Species Helix reclusiana Petit de la Saussaye, 1841 accepted as Gonaxis monrovia (Rang, 1831)
- Species Helix recluziana Le Guillou, 1842 accepted as Albersia zonulata var. recluziana (Le Guillou, 1842)
- Species Helix rectangula L. Pfeiffer, 1846 accepted as Mendana rectangula (L. Pfeiffer, 1846)
- Species Helix redfieldi Reeve, 1852 accepted as Acusta redfieldi (Reeve, 1852)
- Species Helix redfieldiana C. B. Adams, 1850 accepted as Lucerna mora (J. E. Gray, 1833)
- Species Helix redimita W. G. Binney, 1891 accepted as Xerarionta redimita (W. G. Binney, 1858)
- Species Helix redtenbacheri L. Pfeiffer, 1856 accepted as Metafruticicola redtenbacheri (L. Pfeiffer, 1856)
- Species Helix reentsii R. A. Philippi, 1855 accepted as Bostryx eremothauma (Pilsbry, 1896)
- Species Helix reeveana L. Pfeiffer, 1846 accepted as Obba reeveana (L. Pfeiffer, 1846)
- Species Helix reevii Broderip, 1841 accepted as Helicostyla woodiana (I. Lea, 1840)
- Species Helix refuga A. Gould, 1846 accepted as Chersaecia refuga (A. Gould, 1846)
- Species Helix regalis W. H. Benson, 1850 accepted as Dyakia regalis (W. H. Benson, 1850)
- Species Helix regina Bowdich, 1822 accepted as Corona regina (Bowdich, 1822)
- Species Helix reginae Broderip, 1841 accepted as Chloraea reginae (Broderip, 1841)
- Species Helix regularis L. Pfeiffer, 1855 accepted as Helix regularis Reeve, 1854
- Species Helix regularis Reeve, 1854 accepted as Coneuplecta regularis (Reeve, 1854)
- Species Helix regulata W. H. Benson, 1860 accepted as Eurychlamys regulata (W. H. Benson, 1860)
- Species Helix rehbeini Reeve, 1852 accepted as Orthostylus rehbeini (Reeve, 1852)
- Species Helix rehsei E. von Martens, 1883 accepted as Sulcobasis rehsei (E. von Martens, 1883)
- Species Helix reina Benoit, 1857
- Species Helix reinae L. Pfeiffer, 1856 accepted as Schileykiella reinae (L. Pfeiffer, 1856)
- Species Helix reinensis Gobanz, 1854 † accepted as Megalotachea reinensis (Gobanz, 1854) †
- Species Helix reinga L. Pfeiffer, 1846 accepted as Rhagada reinga (L. Pfeiffer, 1846)
- Species Helix reiniana L. Pfeiffer, 1863 accepted as Poecilozonites reinianus (L. Pfeiffer, 1863)
- Species Helix rejecta L. Pfeiffer, 1859 accepted as Tanychlamys rejecta (L. Pfeiffer, 1859)
- Species Helix remondi Tryon, 1863 accepted as Tryonigens remondi (Tryon, 1863)
- Species Helix remota W. H. Benson, 1851 accepted as Oxychilus alliarius (J. S. Miller, 1822)
- Species Helix renaltiana Heude, 1890
- Species Helix renati Dautzenberg, 1894 accepted as Helicopsis renati (Dautzenberg, 1894)
- Species Helix renei Fagot, 1882 accepted as Xerotricha renei (Fagot, 1882)
- Species Helix renitens Morelet, 1861 accepted as Tanychlamys renitens (Morelet, 1861)
- Species Helix repanda L. Pfeiffer, 1861 accepted as Plectotropis repanda (L. Pfeiffer, 1861)
- Species Helix repercussa A. Gould, 1856 accepted as Plectopylis repercussa (A. Gould, 1856)
- Species Helix rerayana Pallary, 1899
- Species Helix reserata Heude, 1885 accepted as Sinicola reserata reserata (Heude, 1885)
- Species Helix resplendens R. A. Philippi, 1847 accepted as Sarika resplendens (R. A. Philippi, 1847)
- Species Helix restricta L. Pfeiffer, 1854 accepted as Chloraea restricta (L. Pfeiffer, 1854)
- Species Helix retardata J. C. Cox, 1870 accepted as Orpiella retardata (J. C. Cox, 1870)
- Species Helix reteporoides Tate, 1887 accepted as Excellaoma reteporoides (Tate, 1887)
- Species Helix retexta Shuttleworth, 1852 accepted as Canaridiscus retextus (Shuttleworth, 1852)
- Species Helix reticulata L. Pfeiffer, 1857 accepted as Helminthoglypta nickliniana ramentosa (A. Gould, 1856)
- Species Helix retifera L. Pfeiffer, 1845 accepted as Ruthvenia retifera (L. Pfeiffer, 1845)
- Species Helix retipora J. C. Cox, 1867 accepted as Excellaoma retipora (J. C. Cox, 1867)
- Species Helix retisculpta E. von Martens, 1889 accepted as Sculptaria retisculpta (E. von Martens, 1889)
- Species Helix retowskii Clessin, 1883 accepted as Helicopsis retowskii (Clessin, 1883)
- Species Helix retrodens Mousson, 1872 accepted as Hemicycla consobrina retrodens (Mousson, 1872)
- Species Helix retrorsa A. Gould, 1843 accepted as Hemiplecta retrorsa (A. Gould, 1843)
- Species Helix retteri O. von Rosen, 1897 accepted as Leucozonella retteri (O. von Rosen, 1897)
- Species Helix retunsa Pease, 1865 accepted as Libera retunsa (Pease, 1865)
- Species Helix retusa L. Pfeiffer, 1846 accepted as Calocochlea retusa (L. Pfeiffer, 1846)
- Species Helix revelata Michaud, 1831 accepted as Ponentina revelata (Michaud, 1831)
- Species Helix revelierei Debeaux, 1867 accepted as Tacheocampylaea cyrniaca (Dutailly, 1867)
- Species Helix revoluta L. Pfeiffer, 1867 accepted as Plectopylis revoluta (L. Pfeiffer, 1867)
- Species Helix reyrei Souverbie, 1858 accepted as Entodina reyrei (Souverbie, 1858)
- Species Helix rhathymos Holmberg, 1912 accepted as Epiphragmophora rhathymos (Holmberg, 1912)
- Species Helix rhea L. Pfeiffer, 1855 accepted as Ryssota otaheitana rhea (L. Pfeiffer, 1855)
- Species Helix rhinion R. A. Philippi, 1858
- Species Helix rhinocerotica Heude, 1890 accepted as Trichochloritis rhinocerotica (Heude, 1890)
- Species Helix rhizophorarum Gassies, 1865 accepted as Andrefrancia rhizophorarum (Gassies, 1865)
- Species Helix rhoda Angas, 1876 accepted as Trochomorpha rhoda (Angas, 1876)
- Species Helix rhodinostama A. d'Orbigny, 1835 accepted as Bahiensis rhodinostomus (A. d'Orbigny, 1835)
- Species Helix rhodocheila W. G. Binney, 1851 accepted as Hemitrochus varians (Menke, 1829)
- Species Helix rhodomphala Tapparone Canefri, 1883 accepted as Cristigibba rhodomphala (Tapparone Canefri, 1883)
- Species Helix rhodostoma Draparnaud, 1801 accepted as Theba pisana (O. F. Müller, 1774)
- Species Helix rhombea Turton, 1819 accepted as Planorbis planorbis (Linnaeus, 1758)
- Species Helix rhombostoma L. Pfeiffer, 1845 accepted as Rhynchotrochus rhombostomus (L. Pfeiffer, 1845)
- Species Helix rhynchaena A. D. Brown, 1870 accepted as Lucerna lucerna (O. F. Müller, 1774)
- Species Helix rhynchonella Tapparone Canefri, 1886 accepted as Rhynchotrochus taylorianus (A. Adams & Reeve, 1850)
- Species Helix rhynchostoma L. Pfeiffer, 1861 accepted as Papuina rhynchostoma (L. Pfeiffer, 1861)
- Species Helix rhytiphora Charpentier, 1847
- Species Helix richardi Lamarck, 1822 accepted as Allogona profunda (Say, 1821)
- Species Helix richardsonii E. A. Smith, 1874 accepted as Rhagada richardsonii (E. A. Smith, 1874)
- Species Helix richmondiana Reeve, 1852 accepted as Thersites richmondiana (Reeve, 1852)
- Species Helix richthofeni E. von Martens, 1874 accepted as Cathaica richthofeni (E. von Martens, 1874)
- Species Helix ridens E. von Martens, 1884 accepted as Tyrrheniberus ridens (E. von Martens, 1884)
- Species Helix ridibunda Tapparone Canefri, 1883 accepted as Canefriula ridibunda (Tapparone Canefri, 1883)
- Species Helix riethmuelleri Tausch, 1886 † accepted as Pseudostrobilus riethmuelleri (Tausch, 1886) †
- Species Helix rigaulti Deshayes, 1863 † accepted as Grandipatula rigaulti (Deshayes, 1863) †
- Species Helix riisei L. Pfeiffer, 1856
- Species Helix rimata L. Pfeiffer, 1847 accepted as Gonaxis monrovia (Rang, 1831)
- Species Helix rimicola W. H. Benson, 1859 accepted as Sitala rimicola (W. H. Benson, 1859)
- Species Helix ringens Linnaeus, 1758 accepted as Anostoma ringens (Linnaeus, 1758)
- Species Helix ripacurcica Bofill, 1886 accepted as Xerocrassa ripacurcica (Bofill, 1886)
- Species Helix riparia C. A. White, 1876 †
- Species Helix ripochi Mabille, 1882 accepted as Hemicycla gaudryi (A. d'Orbigny, 1839)
- Species Helix rissoana L. Pfeiffer, 1847
- Species Helix rivolii Deshayes, 1832 accepted as Corilla rivolii (Deshayes, 1832)
- Species Helix rivularis Krauss, 1848 accepted as Trachycystis rivularis (Krauss, 1848)
- Species Helix rizzae Aradas, 1843 accepted as Monacha rizzae (Aradas, 1843)
- Species Helix robillardi H. Adams & Angas, 1876 accepted as Ampelita robillardi (H. Adams & Angas, 1876)
- Species Helix roblini Petterd, 1879 accepted as Roblinella roblini (Petterd, 1879)
- Species Helix robusta Reuss, 1849 † accepted as Papillotopsis robusta (Reuss, 1849) †
- Species Helix rockhamptonensis J. C. Cox, 1873 accepted as Sphaerospira rockhamptonensis (J. C. Cox, 1873)
- Species Helix rodana Fagot, 1906
- Species Helix rodriguezensis Crosse, 1873 accepted as Dancea rodriguezensis (Crosse, 1873)
- Species Helix roemeri L. Pfeiffer, 1848 accepted as Patera roemeri (L. Pfeiffer, 1848)
- Species Helix roissyana A. Férussac, 1822 accepted as Calocochlea roissyana (A. Férussac, 1822)
- Species Helix rollandii Bernardi, 1857 accepted as Streptaxis rollandii (Bernardi, 1857)
- Species Helix romagnolii Dutailly, 1867 accepted as Tacheocampylaea romagnolii (Dutailly, 1867)
- Species Helix romana Fagot, 1884
- Species Helix romulina Servain, 1880 accepted as Xerosecta reboudiana (Bourguignat, 1863)
- Species Helix rorida W. H. Benson, 1859 accepted as Tanychlamys rorida (W. H. Benson, 1859)
- Species Helix rosacea O. F. Müller, 1774 accepted as Trigonephrus rosaceus (O. F. Müller, 1774)
- Species Helix rosacea G. B. Sowerby I, 1839
- Species Helix rosacea Petterd, 1879 accepted as Scelidoropa tamarensis (Petterd, 1879)
- Species Helix rosai Castro, 1887 accepted as Ponentina rosai (Castro, 1887)
- Species Helix rosamonda W. H. Benson, 1860 accepted as Euplecta semidecussata (Reeve, 1852)
- Species Helix rosarium L. Pfeiffer, 1850 accepted as Solaropsis rosarium (L. Pfeiffer, 1850)
- Species Helix roseri Krauss in E. von Martens, 1860
- Species Helix roseti Benoit, 1857
- Species Helix rosetti [sic] accepted as Helix rozeti Michaud, 1833
- Species Helix rossiana [sic] accepted as Calocochlea roissyana (A. Férussac, 1822)
- Species Helix rossiteriana Crosse, 1871 accepted as Monomphalus rossiterianus (Crosse, 1871)
- Species Helix rossmaessleri L. Pfeiffer, 1842 accepted as Faustina rossmaessleri (L. Pfeiffer, 1842)
- Species Helix rostrata L. Pfeiffer, 1847
- Species Helix rostrella L. Pfeiffer, 1863 accepted as Bradybaena rostrella (L. Pfeiffer, 1863)
- Species Helix rota Broderip, 1841 accepted as Obba rota (Broderip, 1841)
- Species Helix rotabilis Reeve, 1852 accepted as Pedinogyra rotabilis (Reeve, 1852)
- Species Helix rotatoria von dem Busch, 1842 accepted as Landouria rotatoria (von dem Busch, 1842)
- Species Helix rotellaris Matheron, 1832 † accepted as Anostomopsis rotellaris (Matheron, 1832) †
- Species Helix rothii L. Pfeiffer, 1841 accepted as Monacha rothii (L. Pfeiffer, 1841)
- Species Helix rotula Hombron & Jacquinot, 1848
- Species Helix rotula R. T. Lowe, 1831 accepted as Callina rotula (R. T. Lowe, 1831)
- Species Helix rotula A. Gould, 1848 accepted as Paravitrea capsella (A. Gould, 1851)
- Species Helix rotunda accepted as Helix rotundata O. F. Müller, 1774
- Species Helix rotundata O. F. Müller, 1774 accepted as Discus rotundatus (O. F. Müller, 1774)
- Species Helix rouvierana Bourguignat, 1868
- Species Helix rowelli Newcomb, 1865 accepted as Eremarionta rowelli (Newcomb, 1865)
- Species Helix rozeni K. Ali-Zade, 1936 †
- Species Helix rozeti Michaud, 1833
- Species Helix rubens E. von Martens, 1874 accepted as Leucozonella rubens (E. von Martens, 1874)
- Species Helix rubicunda L. Pfeiffer, 1845
- Species Helix rubiginosa A. Gould, 1846 accepted as Cookeconcha jugosa (Mighels, 1845)
- Species Helix rubiginosa Rossmässler, 1838 accepted as Pseudotrichia rubiginosa (Rossmässler, 1838)
- Species Helix rubiginosa A. Schmidt, 1853 accepted as Perforatella rubiginosa (A. Schmidt, 1853)
- Species Helix rubra Albers, 1857 accepted as Sulcobasis penthilus (Iredale, 1941)
- Species Helix rubricata A. Gould, 1846 accepted as Irenella nouleti (Le Guillou, 1842)
- Species Helix ruchetiana Bourguignat, 1869 †
- Species Helix ruderata W. Hartmann, 1821 accepted as Discus (Discus) ruderatus (W. Hartmann, 1821)
- Species Helix ruderoides Michaud, 1862 † accepted as Discus ruderoides (Michaud, 1862) †
- Species Helix rudis Rossmässler, 1837 accepted as Arianta stenzii (Rossmässler, 1835)
- Species Helix rudiuscula L. Pfeiffer, 1846
- Species Helix ruetimeyeri F. Sandberger, 1871 † accepted as Galactochiloides ruetimeyeri (F. Sandberger, 1871) †
- Species Helix rufa Draparnaud, 1805 accepted as Daudebardia rufa (Draparnaud, 1805)
- Species Helix rufa De Kay, 1843 accepted as Neohelix albolabris albolabris (Say, 1817)
- Species Helix rufa R. P. Lesson, 1831 accepted as Hemiplecta rufa (R. P. Lesson, 1831)
- Species Helix rufescens Grateloup, 1840 accepted as Kalidos rufescens (Grateloup, 1840)
- Species Helix rufescens Pennant, 1777 accepted as Arianta arbustorum (Linnaeus, 1758)
- Species Helix rufescens O. G. Costa, 1839 accepted as Cornu aspersum (O. F. Müller, 1774)
- Species Helix ruficincta Newcomb, 1864 accepted as Helix rufocincta Newcomb, 1864
- Species Helix rufina L. Pfeiffer, 1841
- Species Helix rufispira E. von Martens, 1874 accepted as Leucozonella rufispira (E. von Martens, 1874)
- Species Helix rufoapicata Poey, 1858 accepted as Hemitrochus rufoapicata (Poey, 1858)
- Species Helix rufocincta Newcomb, 1864 accepted as Micrarionta rufocincta (Newcomb, 1864)
- Species Helix rufogaster R. P. Lesson, 1832 accepted as Helicostyla rufogaster (R. P. Lesson, 1832)
- Species Helix rufolabris L. Pfeiffer, 1856 accepted as Cernuella virgata (Da Costa, 1778)
- Species Helix rufovirens S. Moricand, 1846 accepted as Simpulopsis rufovirens (S. Moricand, 1846)
- Species Helix rufula L. Pfeiffer, 1850 accepted as Corneosagda rufula (L. Pfeiffer, 1850)
- Species Helix rugata Pease, 1866 accepted as Endodonta rugata (Pease, 1866)
- Species Helix rugeli Shuttleworth, 1852 accepted as Inflectarius rugeli (Shuttleworth, 1852)
- Species Helix ruginosa A. Férussac, 1832 accepted as Trachia ruginosa (A. Férussac, 1832)
- Species Helix rugosa L. Pfeiffer, 1843
- Species Helix rugosa Lamarck, 1822 accepted as Cernuella rugosa (Lamarck, 1822)
- Species Helix rugosiuscula Michaud, 1831 accepted as Candidula rugosiuscula (Michaud, 1831)
- Species Helix rugulosa Zieten, 1832 † accepted as Palaeotachea subsulcosa (Thomä, 1845) †
- Species Helix rumelica Rossmässler, 1838 accepted as Cattania rumelica (Rossmässler, 1838)
- Species Helix rumphii von dem Busch, 1842 accepted as Dyakia rumphii (L. Pfeiffer, 1842)
- Species Helix rumphii L. Pfeiffer, 1842 accepted as Dyakia rumphii (L. Pfeiffer, 1842)
- Species Helix runssorina E. von Martens, 1895 accepted as Halolimnohelix runssorina (E. von Martens, 1895)
- Species Helix rupelli Deshayes, 1870
- Species Helix rupestris Draparnaud, 1801 accepted as Pyramidula rupestris (Draparnaud, 1801)
- Species Helix rusicadensis A. Letourneux, 1870 accepted as Monacha rusicadensis (A. Letourneux, 1870)
- Species Helix rusinica Bourguignat, 1882 accepted as Euomphalia strigella rusinica (Bourguignat, 1882)
- Species Helix russeola Morelet, 1851 accepted as Tanychlamys russeola (Morelet, 1851)
- Species Helix rustica L. Pfeiffer, 1852 accepted as Expocystis rusticus (L. Pfeiffer, 1852)
- Species Helix rusticula Gassies, 1870 accepted as Andrefrancia rusticula (Gassies, 1859)
- Species Helix rutilans L. Pfeiffer, 1848 accepted as Edentiella (Filicinella) leucozona leucozona (C. Pfeiffer, 1828)
- Species Helix rypa Letourneux & Bourguignat, 1887 accepted as Schileykiella sordulenta (Morelet, 1851)
- Species Helix rypara Bourguignat, 1883 accepted as Helix lucorum Linnaeus, 1758
- Species Helix rysa S. V. Wood, 1848 † accepted as Janulus rysa (S. V. Wood, 1848) †
- Species Helix ryssolema Albers, 1852 accepted as Ariophanta thyreus (W. H. Benson, 1852)
- Species Helix sabaea Charpentier, 1847 accepted as Xerocrassa seetzeni (L. Pfeiffer, 1847)
- Species Helix sabiniana Mabille, 1883 accepted as Hemicycla ethelema (Mabille, 1882)
- Species Helix sabuletorum W. H. Benson, 1851 accepted as Trachycystis sabuletorum (W. H. Benson, 1851)
- Species Helix sabulivaga Mabille, 1881 accepted as Helicella sabulivaga (Mabille, 1881)
- Species Helix saburra Gassies, 1874 accepted as Andrefrancia saburra (Gassies, 1874)
- Species Helix saccata Reeve, 1854
- Species Helix sachalensis L. Pfeiffer, 1855 accepted as Papuina sachalensis (L. Pfeiffer, 1855)
- Species Helix sadleriana Rossmässler, 1838 accepted as Campylaea sadleriana (Rossmässler, 1838)
- Species Helix sagemon H. Beck, 1837 accepted as Caracolus sagemon (H. Beck, 1837)
- Species Helix sagittifera L. Pfeiffer, 1842 accepted as Ryssota sagittifera (L. Pfeiffer, 1842)
- Species Helix sagraiana A. d'Orbigny, 1841 accepted as Jeanneretia sagraiana (A. d'Orbigny, 1841)
- Species Helix saigonensis Crosse, 1867 accepted as Geotrochus saigonensis (Crosse, 1867)
- Species Helix saisseti Montrouzier, 1860 accepted as Platyrhytida saisseti (Montrouzier, 1860)
- Species Helix sakalava Angas, 1877 accepted as Ampelita lamarei var. sakalava (Angas, 1877)
- Species Helix salaunica Fagot, 1884
- Species Helix salaziensis G. Nevill, 1870 accepted as Paralaoma servilis (Shuttleworth, 1852)
- Species Helix saldubensis Servain, 1880 accepted as Xerocrassa penchinati (Bourguignat, 1868)
- Species Helix salebrosa Locard, 1899 accepted as Xerosecta promissa (Westerlund, 1892)
- Species Helix salisi Kobelt, 1905 accepted as Helix antiochiensis Kobelt, 1896
- Species Helix salmonensis Tryon, 1887 accepted as Cryptomastix harfordiana (W. G. Binney, 1886)
- Species Helix salomonica Nägele, 1899
- Species Helix salomonis Le Guillou, 1842
- Species Helix salvanae Fagot, 1886 accepted as Xerotricha madritensis (Rambur, 1868)
- Species Helix salvatoris L. Pfeiffer, 1867 accepted as Cepolis (Plagioptycha) duclosiana var. salvatoris (L. Pfeiffer, 1867)
- Species Helix salvini Tristram, 1863 accepted as Strobilops salvini (Tristram, 1863)
- Species Helix samara Heude, 1886
- Species Helix samarella Heude, 1888
- Species Helix samarensis L. Pfeiffer, 1842
- Species Helix samboanga Hombron & Jacquinot, 1847 accepted as Chloraea samboanga (Hombron & Jacquinot, 1847)
- Species Helix samnitum Westerlund, 1889 accepted as Cernuella neglecta (Draparnaud, 1805)
- Species Helix samoa Hombron & Jacquinot, 1841 accepted as Trochomorpha samoa (Hombron & Jacquinot, 1841)
- Species Helix samoensis Baird, 1873 accepted as Lamprocystis upolensis (Mousson, 1865)
- Species Helix samsunensis L. Pfeiffer, 1868 accepted as Monacha samsunensis (L. Pfeiffer, 1868)
- Species Helix sanata Heude, 1890
- Species Helix sancta Bourguignat, 1852 accepted as Oxychilus sanctus (Bourguignat, 1852)
- Species Helix sanctacruzensis L. Pfeiffer, 1855
- Species Helix sanctageorgiensis A. E. Verrill, 1903 accepted as Patera appressa (Say, 1821)
- Species Helix sanctorum Westerlund & Blanc, 1879 accepted as Metafruticicola naxiana (A. Férussac, 1832)
- Species Helix sandai Kobelt, 1879 accepted as Euhadra sandai (Kobelt, 1879)
- Species Helix sandbergeri Deshayes, 1863 † accepted as Vallonia sandbergeri (Deshayes, 1863) †
- Species Helix sandvicensis L. Pfeiffer, 1850
- Species Helix sanis W. H. Benson, 1861 accepted as Videna sanis (W. H. Benson, 1861)
- Species Helix sanmigueli Royo y Gómez, 1929 †
- Species Helix sannio Reeve, 1854 accepted as Dyakia janus (H. Beck, 1837)
- Species Helix sansaniensis Dupuy, 1850 † accepted as Megalotachea turonensis (Deshayes, 1832) †
- Species Helix sansitus J. C. Cox, 1870 accepted as Coneuplecta microconus (Mousson, 1865)
- Species Helix santacruzii A. d'Orbigny, 1835
- Species Helix santanaensis Reeve, 1854 accepted as Thysanophora santanaensis (Reeve, 1854)
- Species Helix santorina A. Letourneux, 1884
- Species Helix sanziana Hombron & Jacquinot, 1841 accepted as Tricheulota sanziana (Hombron & Jacquinot, 1841)
- Species Helix sapeca Heude, 1890 accepted as Geotrochus sapeca (Heude, 1890)
- Species Helix saracena Mousson, 1854 accepted as Xerocrassa simulata (Ehrenberg, 1831)
- Species Helix saranganica Hidalgo, 1887 accepted as Obba saranganica (Hidalgo, 1887)
- Species Helix sarcinosa A. Férussac, 1821 accepted as Helicobulinus sarcinosa (A. Férussac, 1821)
- Species Helix sarcocheilus Mörch, 1850 accepted as Caracolus sarcocheilus (Mörch, 1850)
- Species Helix sarcodes Reeve, 1851 accepted as Pseudhelicarion sarcodes (Reeve, 1851)
- Species Helix sarcostoma P. B. Webb & S. Berthelot, 1833 accepted as Hemicycla sarcostoma (P. B. Webb & S. Berthelot, 1833)
- Species Helix sardalabiata J. C. Cox, 1871 accepted as Temporena sardalabiata (J. C. Cox, 1871)
- Species Helix sardonia E. von Martens, 1884 accepted as Tyrrheniberus sardonius (E. von Martens, 1884)
- Species Helix sarelii E. von Martens, 1867 accepted as Armandiella sarelii (E. von Martens, 1867)
- Species Helix sargenti C. W. Johnson & Pilsbry, 1892 accepted as Patera sargentiana (C. W. Johnson & Pilsbry, 1892)
- Species Helix sargenti Bland, 1875 accepted as Plagioptycha sargenti (Bland, 1875)
- Species Helix sargentiana C. W. Johnson & Pilsbry, 1892 accepted as Patera sargentiana (C. W. Johnson & Pilsbry, 1892)
- Species Helix sargi Crosse & P. Fischer, 1872 accepted as Miraverellia sargi (Crosse & P. Fischer, 1872)
- Species Helix sativa L. Pfeiffer, 1848 accepted as Faustina faustina (Rossmässler, 1835)
- Species Helix satura Bogachev, 1936 †
- Species Helix saturni J. C. Cox, 1864 accepted as Diphyoropa saturni (J. C. Cox, 1864)
- Species Helix saturnia A. Gould, 1846 accepted as Camaena saturnia (A. Gould, 1846)
- Species Helix satyrus Broderip, 1841 accepted as Helicostyla satyrus (Broderip, 1841)
- Species Helix saucatsensis Benoist, 1874 † accepted as Discus saucatsensis (Benoist, 1874) †
- Species Helix saulcyi A. d'Orbigny, 1839 accepted as Hemicycla saulcyi (A. d'Orbigny, 1839)
- Species Helix sauliae L. Pfeiffer, 1845 accepted as Mesanella monochroa sauliae (L. Pfeiffer, 1845)
- Species Helix sauvallei L. Pfeiffer, 1866
- Species Helix savesi Petterd, 1879 accepted as Stenacapha hamiltoni (J. C. Cox, 1868)
- Species Helix savignyana Ehrenberg, 1831
- Species Helix saxaea Bourguignat in Locard, 1894 accepted as Backeljaia gigaxii (L. Pfeiffer, 1847)
- Species Helix saxatilis A. Gould, 1846 accepted as Payenia saxatilis (A. Gould, 1846)
- Species Helix saxatilis Hartmann, 1821 accepted as Pyramidula rupestris (Draparnaud, 1801)
- Species Helix sayii A. Binney, 1840 accepted as Appalachina sayana (Pilsbry & Ferriss, 1906)
- Species Helix scabiosa F. Sandberger, 1875 † accepted as Protodrepanostoma involutum scabiosum (F. Sandberger, 1875) †
- Species Helix scabiosula Locard, 1899 accepted as Xeroplexa scabiosula (Locard, 1899)
- Species Helix scabra Linnaeus, 1758 accepted as Littoraria scabra (Linnaeus, 1758)
- Species Helix scabra Lamarck, 1822 accepted as Anguispira alternata (Say, 1817)
- Species Helix scabriuscula Deshayes, 1832 accepted as Marmorana scabriuscula (Deshayes, 1832)
- Species Helix scabrosa Poey, 1854 accepted as Zachrysia poeyi (Jaume, 1984)
- Species Helix scabrosa A. Férussac, 1822 accepted as Helix marginata O. F. Müller, 1774
- Species Helix scaevola E. von Martens, 1877 accepted as Euhadra scaevola (E. von Martens, 1877)
- Species Helix scalarina L. Pfeiffer, 1852 accepted as Coneuplecta scalarina (L. Pfeiffer, 1852)
- Species Helix scalaris O. F. Müller, 1774 accepted as Helix pomatia Linnaeus, 1758
- Species Helix scalatella Möllendorff, 1888 accepted as Aulacospira scalatella (Möllendorff, 1888)
- Species Helix scalpturita W. H. Benson, 1859 accepted as Bradybaena scalpturita (W. H. Benson, 1859)
- Species Helix scandens J. C. Cox, 1872 accepted as Kaliella scandens (J. C. Cox, 1872)
- Species Helix scarabaeus Linnaeus, 1758 accepted as Pythia scarabaeus (Linnaeus, 1758)
- Species Helix scenoma W. H. Benson, 1863
- Species Helix scepasma Reeve, 1854 accepted as Plectotropis scepasma (Reeve, 1854)
- Species Helix scepasma L. Pfeiffer, 1855 accepted as Helix scepasma Reeve, 1854
- Species Helix schachbulakensis Bourguignat, 1876 accepted as Helix lucorum Linnaeus, 1758
- Species Helix schaerfiae L. Pfeiffer, 1861 accepted as Capitina schaerfiae (L. Pfeiffer, 1861)
- Species Helix schaposchnikovi Rosen, 1911 accepted as Anoplitella schaposchnikovi (Rosen, 1911)
- Species Helix schärfiae L. Pfeiffer, 1861 accepted as Helix schaerfiae L. Pfeiffer, 1861
- Species Helix schaufussi Kobelt, 1876 accepted as Pyrenaearia cantabrica schaufussi (Kobelt, 1876)
- Species Helix scheepmakeri L. Pfeiffer, 1850 accepted as Pseudopapuina scheepmakeri (L. Pfeiffer, 1850)
- Species Helix schelkovnikovi Rosen, 1914
- Species Helix scherzeri Zelebor, 1867 accepted as Rossmaessleria scherzeri (Zelebor, 1867)
- Species Helix schistostelis W. H. Benson, 1859 accepted as Sophina schistostelis (W. H. Benson, 1859)
- Species Helix schlaeflii Mousson, 1859
- Species Helix schlaerotricha Bourguignat, 1870
- Species Helix schlosseriana Brusina, 1874 † accepted as Pseudochloritis schlosseriana (Brusina, 1874) †
- Species Helix schlumbergeri Morlet, 1886 accepted as Halongella schlumbergeri (Morlet, 1886)
- Species Helix schmidtii Rossmässler, 1836 accepted as Arianta schmidtii (Rossmässler, 1836)
- Species Helix schombrii L. Pfeiffer, 1848 accepted as Trochoidea spratti (L. Pfeiffer, 1846)
- Species Helix schomburgiana Möllendorff, 1884 accepted as Ganesella schomburgiana (Möllendorff, 1884)
- Species Helix schotti L. Pfeiffer, 1857 accepted as Monacha obstructa (L. Pfeiffer, 1842)
- Species Helix schrammii P. Fischer, 1858 accepted as Pseudopineria viequensis schrammii (P. Fischer, 1858)
- Species Helix schrenckii Middendorff, 1850 accepted as Fruticicola schrenckii (Middendorff, 1850)
- Species Helix schroeteriana L. Pfeiffer, 1845 accepted as Dentellaria schroeteriana (L. Pfeiffer, 1845)
- Species Helix schuberti J. R. Roth, 1839 accepted as Metafruticicola schuberti (J. R. Roth, 1839)
- Species Helix schumacheriana L. Pfeiffer, 1850 accepted as Hemiplecta densa schumacheriana (L. Pfeiffer, 1850)
- Species Helix schweinfurthi E. von Martens, 1877
- Species Helix schwerzenbachii Calcara, 1841 accepted as Punctum pygmaeum (Draparnaud, 1801)
- Species Helix sciadium L. Pfeiffer, 1857 accepted as Phrixgnathus sciadium (L. Pfeiffer, 1857)
- Species Helix sciamoica Bourguignat, 1881 † accepted as Paradrobacia philoscia (Bourguignat, 1881) †
- Species Helix scintilla R. T. Lowe, 1852 accepted as Lucilla scintilla (R. T. Lowe, 1852)
- Species Helix scitula de Cristofori & Jan, 1832 accepted as Trochoidea elegans (Gmelin, 1791)
- Species Helix sconciensis J. S. Gardner, 1885 † accepted as Oxychilus sconciensis (J. S. Gardner, 1885) †
- Species Helix scorpio A. Gould, 1846 accepted as Orpiella scorpio (A. Gould, 1846)
- Species Helix scotina Mabille, 1884
- Species Helix scotti J. C. Cox, 1864 accepted as Sauroconcha gulosa (A. Gould, 1846)
- Species Helix scrobiculata L. Pfeiffer, 1842 accepted as Obba scrobiculata (L. Pfeiffer, 1842)
- Species Helix sculptilis Pease, 1865 accepted as Libera fratercula (Pease, 1867)
- Species Helix sculptilis Bland, 1858 accepted as Glyphyalinia sculptilis (Bland, 1858)
- Species Helix sculpturata (Gray, 1838) accepted as Sculptaria sculpturata (J. E. Gray, 1838)
- Species Helix scutula Shuttleworth, 1852 accepted as Canaridiscus scutulus (Shuttleworth, 1852)
- Species Helix scytodes Reeve, 1854 accepted as Trochomorpha scytodes (Reeve, 1854)
- Species Helix sebacea L. Pfeiffer, 1857 accepted as Trochomorpha meleagris (L. Pfeiffer, 1855)
- Species Helix seberti Marie, 1881 accepted as Diplomphalus mariei (Crosse, 1867)
- Species Helix secernenda Rossmässler, 1847
- Species Helix seckendorffiana L. Pfeiffer, 1847 accepted as Helicostyla seckendorffiana (L. Pfeiffer, 1847)
- Species Helix secunda O. G. Costa, 1839 accepted as Cornu aspersum (O. F. Müller, 1774)
- Species Helix secundaria Heude, 1890
- Species Helix secura Heude, 1890 accepted as Sicradiscus securus (Heude, 1890)
- Species Helix securiformis Deshayes, 1850
- Species Helix sedentaria Heude, 1885
- Species Helix seetzeni L. Pfeiffer, 1847 accepted as Xerocrassa seetzeni (L. Pfeiffer, 1847)
- Species Helix segalaunica Sayn, 1888 accepted as Helix pomatia Linnaeus, 1758
- Species Helix segetum Fagot, 1888 accepted as Xerotricha barcinensis (Bourguignat, 1868)
- Species Helix seguiniana Heude, 1885 accepted as Bradybaena seguiniana (Heude, 1885)
- Species Helix seguyana Bourguignat, 1884 accepted as Otala tingitana (Paladilhe, 1875)
- Species Helix seissanica Bourguignat, 1881 † accepted as Cepaea eversa larteti (de Boissy, 1840) †
- Species Helix seisseti Souverbie, 1860 accepted as Platyrhytida saisseti (Montrouzier, 1860)
- Species Helix selecta Klika, 1894 accepted as Stenomphalia selecta (Klika, 1894)
- Species Helix selenina A. Gould, 1848 accepted as Lacteoluna selenina (A. Gould, 1848)
- Species Helix selenkai L. Pfeiffer, 1866 accepted as Habroconus selenkai (L. Pfeiffer, 1866)
- Species Helix selenostoma L. Pfeiffer, 1854 accepted as Solaropsis selenostoma (L. Pfeiffer, 1854)
- Species Helix sellersi J. C. Cox, 1872 accepted as Megalacron sellersi (J. C. Cox, 1872)
- Species Helix selskii Gerstfeldt, 1859 accepted as Karaftohelix selskii (Gerstfeldt, 1859)
- Species Helix semanni A. Letourneux, 1870
- Species Helix semenlini S. Moricand, 1846 accepted as Habroconus semenlini (S. Moricand, 1846)
- Species Helix semenowi E. von Martens, 1864 accepted as Ponsadenia semenowi (E. von Martens, 1864)
- Species Helix semicarinata Ancey, 1881
- Species Helix semicastanea L. Pfeiffer, 1849 accepted as Hadra semicastanea (L. Pfeiffer, 1849)
- Species Helix semicerina Morelet, 1851 accepted as Harmogenanina semicerina (Morelet, 1851)
- Species Helix semiclausa E. von Martens, 1868 accepted as Epiphragmophora semiclausa (E. von Martens, 1868)
- Species Helix semidecussata Reeve, 1852 accepted as Euplecta semidecussata (Reeve, 1852)
- Species Helix semifusca Deshayes, 1832 accepted as Dancea semifusca (Deshayes, 1832)
- Species Helix semiglobosa L. Pfeiffer, 1845 accepted as Hemiglypta fulvida semiglobosa (L. Pfeiffer, 1845)
- Species Helix semigranosa G. B. Sowerby I, 1841
- Species Helix semiinversa Cossmann, 1913 †
- Species Helix semilimax J. B. Férussac, 1802 accepted as Semilimax semilimax (J. B. Férussac, 1802)
- Species Helix semilineata Menke, 1828 accepted as Megalobulimus oblongus (O. F. Müller, 1774)
- Species Helix seminigra Morelet, 1864 accepted as Figuladra lessoni (L. Pfeiffer, 1846)
- Species Helix seminium Morelet, 1873 accepted as Afropunctum seminium (Morelet, 1873)
- Species Helix semipartita Deshayes, 1850 accepted as Xesta semipartita (Deshayes, 1850)
- Species Helix semipicta Hidalgo, 1870 accepted as Helicella cistorum (Morelet, 1845)
- Species Helix semiplana Reuss, 1849 † accepted as Miozonites algiroides (Reuss, 1849) †
- Species Helix semiplicata L. Pfeiffer, 1852 accepted as Atlantica gueriniana (R. T. Lowe, 1852)
- Species Helix semirufa Albers, 1850 accepted as Helicostyla (Calocochlea) semirufa (Albers, 1850)
- Species Helix semirugosa Pallary, 1899
- Species Helix semna Bourguignat, 1881 † accepted as Hemicycla asperula leymerieana (Noulet, 1854) †
- Species Helix semperiana Crosse, 1861 † accepted as Leucochroa semperiana (Crosse, 1861) †
- Species Helix sempriniana Heude, 1882
- Species Helix senckenbergiana Kobelt, 1875 accepted as Euhadra senckenbergiana (Kobelt, 1875)
- Species Helix senensis Pantanelli, 1877 † accepted as Agalactochilus senensis (Pantanelli, 1877) †
- Species Helix senilis R. T. Lowe, 1852 accepted as Discula polymorpha (R. T. Lowe, 1831)
- Species Helix senilis Morelet, 1851 accepted as Otala lactea (O. F. Müller, 1774)
- Species Helix seposita W. H. Benson, 1859 accepted as Durgella seposita (W. H. Benson, 1859)
- Species Helix seposita Strobel, 1854 accepted as Acavus phoenix phoenix (L. Pfeiffer, 1854)
- Species Helix septemspiralis Razoumowsky, 1789 accepted as Cochlostoma septemspirale (Razoumowsky, 1789)
- Species Helix septemvolva (Say, 1818) accepted as Polygyra septemvolva Say, 1818
- Species Helix sepulcralis A. Férussac, 1821 accepted as Ampelita sepulcralis (A. Férussac, 1821)
- Species Helix sepulta Michelotti, 1840 † accepted as Cepaea nemoralis sepulta (Michelotti, 1840) †
- Species Helix sequax W. H. Benson, 1859 accepted as Tanychlamys sequax (W. H. Benson, 1859)
- Species Helix sequentiana Benoit, 1862
- Species Helix sequoicola J. G. Cooper, 1866 accepted as Helminthoglypta sequoicola (J. G. Cooper, 1866)
- Species Helix seraphinica Heude, 1890 accepted as Camaena seraphinica (Heude, 1890)
- Species Helix serbica Kobelt, 1872 accepted as Dinarica serbica (Kobelt, 1872)
- Species Helix serena J. C. Cox, 1873 accepted as Trochomorpha serena (J. C. Cox, 1873)
- Species Helix sericatula L. Pfeiffer, 1849 accepted as Elsothera sericatula (L. Pfeiffer, 1849)
- Species Helix sericea Draparnaud, 1801 accepted as Trochulus hispidus (Linnaeus, 1758)
- Species Helix sericea Schrenck, 1867 accepted as Stygius stuxbergi (Westerlund, 1876)
- Species Helix sericea O. F. Müller, 1774
- Species Helix sericella Servain, 1880
- Species Helix sermenazensis Locard, 1883 † accepted as Leucochroopsis valentinensis f. sermenazensis (Locard, 1883) †
- Species Helix serpentina A. Férussac, 1821 accepted as Marmorana serpentina (A. Férussac, 1821)
- Species Helix serpentinites Boubée, 1831 † accepted as Palaeoxestina serpentinites (Boubée, 1831) †
- Species Helix serpestes Heude, 1890 accepted as Aegista serpestes (Heude, 1890)
- Species Helix serpuloides Montagu, 1808 accepted as Skenea serpuloides (Montagu, 1808)
- Species Helix serrula W. H. Benson, 1836 accepted as Khasiella serrula (W. H. Benson, 1836)
- Species Helix serrula Morelet, 1845 accepted as Xeroplexa setubalensis (L. Pfeiffer, 1850)
- Species Helix serta Albers, 1864 accepted as Eremina advena serta (Albers, 1854)
- Species Helix servilis Shuttleworth, 1852 accepted as Paralaoma servilis (Shuttleworth, 1852)
- Species Helix sesquicincta E. von Martens, 1900 accepted as Fuellebornia sesquicincta (E. von Martens, 1900)
- Species Helix sesteri Galland, 1885
- Species Helix setiger G. B. Sowerby I, 1841 accepted as Hemitrichiella setiger (G. B. Sowerby I, 1841)
- Species Helix setigera A. Gould, 1844 accepted as Cookeconcha hystrix (L. Pfeiffer, 1846)
- Species Helix setigera Rossmässler, 1836 accepted as Liburnica setigera (Rossmässler, 1836)
- Species Helix setigera G. B. Sowerby I, 1841 accepted as Helix setiger G. B. Sowerby I, 1841
- Species Helix setiliris W. H. Benson, 1859 accepted as Erepta setiliris (W. H. Benson, 1859)
- Species Helix setipila Rossmässler, 1835 accepted as Campylaea planospira setulosa (Briganti, 1825)
- Species Helix setosa A. Férussac, 1832 accepted as Liburnica setosa (A. Férussac, 1832)
- Species Helix setubalensis L. Pfeiffer, 1850 accepted as Xeroplexa setubalensis (L. Pfeiffer, 1850)
- Species Helix sexlamellata L. Pfeiffer, 1845 accepted as Anceyodonta sexlamellata (L. Pfeiffer, 1845)
- Species Helix sganziniana Crosse & P. Fischer, 1876 accepted as Ampelita sepulcralis (A. Férussac, 1821)
- Species Helix shanghiensis L. Pfeiffer, 1853
- Species Helix shermani L. Pfeiffer, 1866 accepted as Videnoida shermani (L. Pfeiffer, 1866)
- Species Helix shiplayi L. Pfeiffer, 1857 accepted as Euplecta shiplayi (L. Pfeiffer, 1857)
- Species Helix shiraoi Ijima, 1891 accepted as Ainohelix editha (A. Adams, 1868)
- Species Helix shuttleworthi L. Pfeiffer, 1851 accepted as Drepanotrema anatinum (A. d'Orbigny, 1835)
- Species Helix siamensis L. Pfeiffer, 1856 accepted as Sarika siamensis (L. Pfeiffer, 1856)
- Species Helix sibirica Westerlund, 1897 accepted as Chilanodon gerstfeldti (W. Dybowski, 1901)
- Species Helix sicanoides Kobelt, 1881 accepted as Rossmaessleria scherzeri sicanoides (Kobelt, 1881)
- Species Helix siculus Brazier, 1876 accepted as Canefriula sicula (Brazier, 1876)
- Species Helix sieboldtiana L. Pfeiffer, 1850 accepted as Acusta sieboldtiana (L. Pfeiffer, 1850)
- Species Helix sieversi E. von Martens, 1889 accepted as Labyrinthus sieversi (E. von Martens, 1889)
- Species Helix sigela Bourguignat, 1883 accepted as Chilostoma colubrinum colubrinum (De Cristofori & Jan, 1832)
- Species Helix sigensis Kobelt, 1882
- Species Helix sigmoides Morelet, 1851 accepted as Itzamna sigmoides (Morelet, 1851)
- Species Helix significans Bland, 1866 accepted as Paravitrea significans (Bland, 1866)
- Species Helix silenus Angas, 1873 accepted as Chloritis silenus (Angas, 1873)
- Species Helix silvana Klein, 1853 † accepted as Palaeotachea silvana (Klein, 1853) †
- Species Helix silvatica [sic] accepted as Helix sylvatica Draparnaud, 1801
- Species Helix simia A. Férussac, 1832 accepted as Leptaxis simia (A. Férussac, 1832)
- Species Helix simiarum Kobelt, 1882
- Species Helix similaris A. Férussac, 1822 accepted as Bradybaena similaris (A. Férussac, 1822)
- Species Helix similis Thomä, 1845 † accepted as Leucochroopsis leptoloma (F. Sandberger, 1858) †
- Species Helix similis J. C. Cox, 1868 accepted as Paralaoma morti (J. C. Cox, 1864)
- Species Helix similis C. B. Adams, 1849 accepted as Hyalosagda similis (C. B. Adams, 1849)
- Species Helix simillima Pease, 1864 accepted as Lamprocystis simillima (Pease, 1864)
- Species Helix simodae J. C. Jay, 1856 accepted as Euhadra peliomphala simodae (J. C. Jay, 1856)
- Species Helix simoniana Bourguignat, 1870
- Species Helix simplicula Morelet, 1845 accepted as Gasulliella simplicula (Morelet, 1845)
- Species Helix simson L. Pfeiffer, 1852 accepted as Dentellaria simson (L. Pfeiffer, 1852)
- Species Helix simsoniana R. M. Johnston, 1881 †
- Species Helix simulans C. B. Adams, 1849 accepted as Guppya gundlachii (L. Pfeiffer, 1840)
- Species Helix simulata Ehrenberg, 1831 accepted as Xerocrassa simulata (Ehrenberg, 1831)
- Species Helix sinaitensis L. Pfeiffer, 1846 accepted as Vitrinoconus sinaitensis (L. Pfeiffer, 1846)
- Species Helix sincera C. B. Adams, 1845 accepted as Strialuna sincera (C. B. Adams, 1845)
- Species Helix sinclairi L. Pfeiffer, 1845 accepted as Tasmaphena sinclairi (L. Pfeiffer, 1845)
- Species Helix singularis Reeve, 1854 accepted as Draparnaudia singularis (Reeve, 1854)
- Species Helix siningfuensis Hilber, 1882 accepted as Cathaica siningfuensis (Hilber, 1882)
- Species Helix sinistra Bonnet, 1864
- Species Helix sinuata O. F. Müller, 1774 accepted as Dentellaria sinuata (O. F. Müller, 1774)
- Species Helix sinuosa Gmelin, 1791 accepted as Dentellaria sinuata (O. F. Müller, 1774)
- Species Helix siquijorensis Broderip, 1841 accepted as Anixa siquijorensis (Broderip, 1841)
- Species Helix sirena L. Pfeiffer, 1842 accepted as Chloraea sirena (L. Pfeiffer, 1842)
- Species Helix sireti Pallary, 1898
- Species Helix sitiens Legrand, 1871 accepted as Paralaoma caputspinulae (Reeve, 1852)
- Species Helix sitiensis Maltzan, 1887 accepted as Pseudoxerophila bathytera (Blanc, 1879)
- Species Helix sivericensis Dainelli, 1901 †
- Species Helix sjostedti d'Ailly, 1910 accepted as Haplohelix rufofusca (E. von Martens, 1895)
- Species Helix skiaphila A. d'Orbigny, 1835 accepted as Happia skiaphila (A. d'Orbigny, 1835)
- Species Helix skinneri Reeve, 1854 accepted as Oligospira skinneri (Reeve, 1854)
- Species Helix sloaneana L. Pfeiffer, 1868 accepted as Dentellaria sloaneana (L. Pfeiffer, 1868)
- Species Helix smimensis Mousson, 1849 accepted as Landouria smimensis (Mousson, 1849)
- Species Helix smironensis Mousson, 1850 accepted as Helix smimensis Mousson, 1849
- Species Helix smiruensis E. von Martens, 1867 accepted as Landouria smimensis (Mousson, 1849)
- Species Helix smithi Bock, 1881 accepted as Trachia smithi (Bock, 1881)
- Species Helix smithiana L. Pfeiffer, 1866
- Species Helix smyrnensis J. R. Roth, 1839 accepted as Zonites smyrnensis (J. R. Roth, 1839)
- Species Helix sobara Mabille, 1881 accepted as Monacha cantiana (Montagu, 1803)
- Species Helix sobrina A. Férussac, 1819 accepted as Polydontes sobrina (A. Férussac, 1819)
- Species Helix socia L. Pfeiffer, 1853 accepted as Helix lucorum Linnaeus, 1758
- Species Helix solanoi Servain, 1880 accepted as Cernuella virgata (Da Costa, 1778)
- Species Helix solarium Quoy & Gaimard, 1832 accepted as Trochomorpha solarium (Quoy & Gaimard, 1832)
- Species Helix solata W. H. Benson, 1848 accepted as Ariophanta solata (W. H. Benson, 1848)
- Species Helix solida Born, 1778 accepted as Phasianella solida (Born, 1778)
- Species Helix solida L. Pfeiffer, 1853 accepted as Calocochlea roissyana (A. Férussac, 1822)
- Species Helix solida Albers, 1860 accepted as Helix asemnis Bourguignat, 1860
- Species Helix solidens Mabille, 1895 accepted as Linisa anilis (Gabb, 1865)
- Species Helix solidior Mousson, 1873 accepted as Hesseola solidior (Mousson, 1873)
- Species Helix solidiuscula E. A. Smith, 1886 accepted as Orpiella solidiuscula (E. A. Smith, 1885)
- Species Helix solidula Reeve, 1854
- Species Helix solitaria Say, 1821 accepted as Anguispira kochi (L. Pfeiffer, 1846)
- Species Helix solitudinis Bourguignat, 1852 accepted as Monacha solitudinis (Bourguignat, 1852)
- Species Helix solorensis E. von Martens, 1863 accepted as Rhagada solorensis (E. von Martens, 1863)
- Species Helix soluta Michaud, 1833 accepted as Loxana alabastrites (Michaud, 1833)
- Species Helix somersetii Prime, 1853
- Species Helix sophiae Reeve, 1854 accepted as Gudeoconcha sophiae (Reeve, 1854)
- Species Helix sophiae Gaskoin, 1855 accepted as Gudeoconcha sophiae (Reeve, 1854)
- Species Helix sordida L. Pfeiffer, 1842 accepted as Trachia sordida (L. Pfeiffer, 1842)
- Species Helix sordidus R. P. Lesson, 1831 accepted as Bostryx sordidus (R. P. Lesson, 1831)
- Species Helix sordulenta Morelet, 1851 accepted as Schileykiella sordulenta (Morelet, 1851)
- Species Helix soror A. Férussac, 1821 accepted as Pleurodonte soror (A. Férussac, 1821)
- Species Helix sororcula Benoit, 1859 accepted as Gittenbergia sororcula (Benoit, 1859)
- Species Helix sororia J. C. Cox, 1870
- Species Helix souleyetiana Petit de la Saussaye, 1841 accepted as Seychellaxis souleyetianus (Petit de la Saussaye, 1841)
- Species Helix souverbiana P. Fischer, 1860 accepted as Helicophanta souverbiana (P. Fischer, 1860)
- Species Helix sowerbiana A. Férussac, 1821 accepted as Pupa sowerbiana Potiez & Michaud, 1838
- Species Helix sowerbyana L. Pfeiffer, 1841 accepted as Trukrhysa pachystoma (Hombron & Jacquinot, 1841)
- Species Helix spadae Calcara, 1845 accepted as Xerogyra spadae (Calcara, 1845)
- Species Helix spania Tausch, 1886 †
- Species Helix sparnacensis Deshayes, 1863 † accepted as Vallonia (Nanopatula) sparnacensis (Deshayes, 1863) †
- Species Helix sparsa (Mousson, 1857) accepted as Asperitas sparsa (Mousson, 1857)
- Species Helix sparsisticta F. Sandberger, 1875 † accepted as Pseudochloritis incrassata sparsisticta (F. Sandberger, 1875) †
- Species Helix spatiosa Meek & Hayden, 1861 † accepted as Glyptostoma spatiosum (Meek & Hayden, 1861) †
- Species Helix specialis Bourguignat, 1881 accepted as Xerosecta reboudiana (Bourguignat, 1863)
- Species Helix speciosa J. C. Jay, 1836 accepted as Helicostyla speciosa (J. C. Jay, 1836)
- Species Helix speciosa J. C. Jay, 1839 sensu L. Pfeiffer, 1847 accepted as Helix coccomelos G. B. Sowerby I, 1841
- Species Helix spectabilis L. Pfeiffer, 1844 accepted as Macroceras spectabilis (L. Pfeiffer, 1844)
- Species Helix spengleriana L. Pfeiffer, 1847 accepted as Lucerna bainbridgii (L. Pfeiffer, 1845)
- Species Helix spermatia Castro, 1887 accepted as Spermodea lamellata (Jeffreys, 1830)
- Species Helix sphaerica G. B. Sowerby I, 1841 accepted as Pachysphaera sphaerica (G. B. Sowerby I, 1841)
- Species Helix sphaerion G. B. Sowerby I, 1841 accepted as Chloraea sphaerion (G. B. Sowerby I, 1841)
- Species Helix sphaeriostoma Bourguignat, 1857 accepted as Thiessea sphaeriostoma (Bourguignat, 1857)
- Species Helix sphaeromorpha Bourguignat, 1884 accepted as Otala lactea (O. F. Müller, 1774)
- Species Helix spheroidea Le Guillou, 1842 accepted as Xanthomelon durvillii (Hombron & Jacquinot, 1841)
- Species Helix spiceri Petterd, 1879 accepted as Trocholaoma parvissima (Legrand, 1871)
- Species Helix spiculosa L. Pfeiffer, 1859 accepted as Sagda spiculosa (L. Pfeiffer, 1859)
- Species Helix spinei J. C. Cox, 1868 accepted as Mussonena spinei (J. C. Cox, 1868)
- Species Helix spinifera Mousson, 1872 accepted as Acanthinula spinifera (Mousson, 1872)
- Species Helix spinosa (I. Lea, 1831) accepted as Stenotrema spinosum (I. Lea, 1831)
- Species Helix spinulosa Lightfoot, 1786
- Species Helix spiralis Le Guillou, 1845 accepted as Xesta citrina spiralis (Le Guillou, 1845)
- Species Helix spirata de Serres, 1853 †
- Species Helix spirillus A. Gould, 1852
- Species Helix spiriplana Olivier, 1801 accepted as Levantina spiriplana (Olivier, 1801)
- Species Helix spirizona Quoy & Gaimard, 1825 accepted as Amastra spirizona (Quoy & Gaimard, 1825)
- Species Helix spirorbis Linnaeus, 1758 accepted as Anisus spirorbis (Linnaeus, 1758)
- Species Helix spirorbis Deshayes, 1850 accepted as Scolodonta spirorbis (Deshayes, 1850)
- Species Helix spiroxia Bourguignat, 1868 accepted as Monacha spiroxia (Bourguignat, 1868)
- Species Helix spirula A. Villa & J. B. Villa, 1841 accepted as Pyramidula pusilla (Vallot, 1801)
- Species Helix spirulata L. Pfeiffer, 1846 accepted as Guppya spirulata (L. Pfeiffer, 1846)
- Species Helix spixiana L. Pfeiffer, 1841 accepted as Solarium candidum Spix, 1827
- Species Helix spixii A. d'Orbigny, 1835 accepted as Clessinia striata (Spix, 1827)
- Species Helix splendescens J. C. Cox, 1866 accepted as Papuina splendescens (J. C. Cox, 1866)
- Species Helix splendida Draparnaud, 1801 accepted as Iberus splendidus (Draparnaud, 1801)
- Species Helix splendidula L. Pfeiffer, 1846 accepted as Saladelos commixta Iredale, 1933
- Species Helix splendidula Anton, 1838 accepted as Praticolella griseola (L. Pfeiffer, 1841)
- Species Helix sporadica A. d'Orbigny, 1835 accepted as Bulimulus bonariensis sporadicus (A. d'Orbigny, 1835)
- Species Helix sportella A. Gould, 1846 accepted as Ancotrema sportella sportella (A. Gould, 1846)
- Species Helix spratti L. Pfeiffer, 1846 accepted as Trochoidea spratti (L. Pfeiffer, 1846)
- Species Helix spreta C. B. Adams, 1851 accepted as Stauroglypta spreta (C. B. Adams, 1851)
- Species Helix spumosa Lowe, 1861 accepted as Cornu aspersum (O. F. Müller, 1774)
- Species Helix spurca G. B. Sowerby I, 1844 accepted as Pseudohelenoconcha spurca (G. B. Sowerby I, 1844)
- Species Helix squalus Hinds, 1845
- Species Helix squamatina Rossmässler, 1835 accepted as Corneola squamatina (Rossmässler, 1835)
- Species Helix squamosa A. Férussac, 1821 accepted as Cepolis squamosa (A. Férussac, 1821)
- Species Helix squamosella Heude, 1882
- Species Helix squamulina Gredler, 1884 accepted as Ganesella squamulina (Gredler, 1884)
- Species Helix squamulosa Mousson, 1856
- Species Helix squarrosa A. Gould, 1859 accepted as Aegista (Aegista) squarrosa (A. Gould, 1859)
- Species Helix stabilis G. B. Sowerby I, 1841 accepted as Cochlostyla stabilis (G. B. Sowerby I, 1841)
- Species Helix stagnalis Linnaeus, 1758 accepted as Lymnaea stagnalis (Linnaeus, 1758)
- Species Helix stagnalis Linnaeus, 1767 accepted as Eupaludestrina stagnorum (Gmelin, 1791)
- Species Helix stagnorum Gmelin, 1791 accepted as Eupaludestrina stagnorum (Gmelin, 1791)
- Species Helix stagnorum Gmelin, 1791 sensu Pulteney, 1799 accepted as Cochlicopa lubrica (O. F. Müller, 1774)
- Species Helix stampinensis Deshayes, 1863 † accepted as Acanthinula stampinensis (Deshayes, 1863) †
- Species Helix stanleyensis Petterd, 1879 accepted as Scelidoropa officeri (Legrand, 1871)
- Species Helix stauropolitana A. Schmidt, 1855 accepted as Caucasotachea atrolabiata stauropolitana (A. Schmidt, 1855)
- Species Helix stearnsiana Gabb, 1868 accepted as Xerarionta stearnsiana (Gabb, 1868)
- Species Helix steenstrupii Mörch, 1857 accepted as Oxychilus alliarius (J. S. Miller, 1822)
- Species Helix steganella Mabille, 1895 accepted as Greggelix loehrii (Gabb, 1868)
- Species Helix steinheimensis Klein, 1846 † accepted as Joossia insignis (Zieten, 1832) †
- Species Helix stellaris R. T. Lowe, 1852 accepted as Actinella lentiginosa stellaris (R. T. Lowe, 1852)
- Species Helix stellula A. Gould, 1844 accepted as Cookeconcha stellula (A. Gould, 1844)
- Species Helix stenogyra L. Pfeiffer, 1854 accepted as Systrophia stenogyra (L. Pfeiffer, 1854)
- Species Helix stenomphala Menke, 1830 accepted as Dinarica stenomphala (Menke, 1830)
- Species Helix stenopsis M. A. Moquin-Tandon, 1856 accepted as Chloraea restricta (L. Pfeiffer, 1854)
- Species Helix stenospira Reuss, 1849 † accepted as Discus stenospira (Reuss, 1849) †
- Species Helix stenostoma L. Pfeiffer, 1846
- Species Helix stenotrema L. Pfeiffer, 1842 accepted as Stenotrema stenotrema (L. Pfeiffer, 1842)
- Species Helix stenotrepta L. Pfeiffer, 1857 accepted as Systrophia stenostrepta (L. Pfeiffer, 1856)
- Species Helix stenozona Möllendorff, 1884 accepted as Satsuma mellea stenozona (Möllendorff, 1884)
- Species Helix stenzii Rossmässler, 1835 accepted as Arianta stenzii (Rossmässler, 1835)
- Species Helix stephanophora Deshayes, 1850 accepted as Janulus stephanophorus (Deshayes, 1850)
- Species Helix stephus W. H. Benson, 1861 accepted as Tanychlamys stephus (W. H. Benson, 1861)
- Species Helix sterilis Heude, 1890 accepted as Plectotropis sterilis (Heude, 1890)
- Species Helix sterra Bourguignat, 1881 † accepted as Hemicycla asperula leymerieana (Noulet, 1854) †
- Species Helix steursiana Shuttleworth, 1852 accepted as Papuina steursiana (Shuttleworth, 1852)
- Species Helix sthenara Bourguignat, 1881 † accepted as Cepaea eversa larteti (de Boissy, 1840) †
- Species Helix stigmatica L. Pfeiffer, 1841 accepted as Setipellis stigmatica (L. Pfeiffer, 1841)
- Species Helix stilpna Mabille, 1884 accepted as Ampelita stilpna (Mabille, 1884)
- Species Helix stimpsoni Reeve, 1854 accepted as Bradybaena similaris (A. Férussac, 1822)
- Species Helix stiparum Rossmässler, 1854 accepted as Helicella stiparum (Rossmässler, 1854)
- Species Helix stipulata Reeve, 1852 accepted as Aeschrodomus stipulata (Reeve, 1852)
- Species Helix stirophora E. A. Smith, 1895 accepted as Sulcobasis stirophora (E. A. Smith, 1895)
- Species Helix stolephora Valenciennes, 1827 accepted as Lamarckiella stolephora (Valenciennes, 1827)
- Species Helix stoliczkana L. Pfeiffer, 1877 accepted as Fruticicola stoliczkana (L. Pfeiffer, 1877)
- Species Helix stolismena Servain, 1880 accepted as Microxeromagna lowei (Potiez & Michaud, 1838)
- Species Helix stostoma Reeve, 1852 accepted as Labyrinthus otostomus (Reeve, 1852)
- Species Helix stragulum Crosse & P. Fischer, 1873 accepted as Ampelita lamarei (L. Pfeiffer, 1853)
- Species Helix straminea Briganti, 1825
- Species Helix straminea Heude, 1882 accepted as Bradybaena straminea (Heude, 1882)
- Species Helix straminiformis Bourguignat, 1876 accepted as Helix straminea Briganti, 1825
- Species Helix strangei L. Pfeiffer, 1849 accepted as Austrorhytida capillacea (A. Férussac, 1832)
- Species Helix strangeoides J. C. Cox, 1864 accepted as Echotrida strangeoides (J. C. Cox, 1864)
- Species Helix strangulata C. B. Adams, 1849 accepted as Dentellaria strangulata (C. B. Adams, 1849)
- Species Helix strangulata Hombron & Jacquinot, 1841 accepted as Trachiopsis strangulata (Hombron & Jacquinot, 1841)
- Species Helix straubei Kobelt, 1904 accepted as Helix pomacella Mousson, 1854
- Species Helix streatori Pilsbry, 1889
- Species Helix strebeli L. Pfeiffer, 1861 accepted as Strobilops strebeli (L. Pfeiffer, 1861)
- Species Helix streptaxon Reeve, 1852 accepted as Libera streptaxon (Reeve, 1852)
- Species Helix striata Eichwald, 1830 † accepted as Janulus striatus (Eichwald, 1830) †
- Species Helix striata O. F. Müller, 1774 accepted as Helicopsis striata (O. F. Müller, 1774)
- Species Helix striatella Rang, 1831 accepted as Striosubulina striatella (Rang, 1831)
- Species Helix striatella J. G. Anthony, 1840 accepted as Discus whitneyi (Newcomb, 1864)
- Species Helix striatula O. F. Müller, 1774 accepted as Cathaica fasciola (Draparnaud, 1801)
- Species Helix striatula Linnaeus, 1758
- Species Helix striatula Olivi, 1792
- Species Helix strigata A. Férussac, 1821 accepted as Marmorana (Ambigua) signata umbrica (Mabille, 1867)
- Species Helix strigella Draparnaud, 1801 accepted as Euomphalia strigella (Draparnaud, 1801)
- Species Helix strigellina Locard, 1894 † accepted as Euomphalia strigella strigellina (Locard, 1894) †
- Species Helix strigilis L. Pfeiffer, 1846 accepted as Glyptobensonia strigilis (L. Pfeiffer, 1846)
- Species Helix strigosa A. Gould, 1846 accepted as Oreohelix strigosa (A. Gould, 1846)
- Species Helix striolata Pease, 1861 accepted as Liardetia striolata (Pease, 1861)
- Species Helix striolata C. Pfeiffer, 1828 accepted as Trochulus striolatus striolatus (C. Pfeiffer, 1828)
- Species Helix strobilops [sic] accepted as Helix strobilus A. Férussac, 1821
- Species Helix strobilus A. Férussac, 1821 accepted as Coryda alauda (A. Férussac, 1821)
- Species Helix strongillostoma Bourguignat, 1881 † accepted as Cepaea eversa larteti (de Boissy, 1840) †
- Species Helix strongylodes Reeve, 1854 accepted as Anguispira strongylodes (Reeve, 1854)
- Species Helix stroudensis J. C. Cox, 1864 accepted as Cralopa stroudensis (J. C. Cox, 1864)
- Species Helix strucki Maltzan, 1886 accepted as Xeroplexa strucki (Maltzan, 1886)
- Species Helix strumosa Reeve, 1852 accepted as Plagioptycha strumosa (Reeve, 1852)
- Species Helix struposa Mabille, 1887 accepted as Tonkinia struposa (Mabille, 1887)
- Species Helix stuartiae L. Pfeiffer, 1845 accepted as Asperitas trochus (O. F. Müller, 1774)
- Species Helix studeriana A. Férussac, 1821 accepted as Stylodonta studeriana (A. Férussac, 1821)
- Species Helix stueri Cossmann, 1892 † accepted as Acanthinula stueri (Cossmann, 1892) †
- Species Helix stulta Mabille, 1883 accepted as Hemicycla saulcyi carta (Mabille, 1882) †
- Species Helix stumpffii Kobelt, 1880 accepted as Ampelita stumpffii (Kobelt, 1880)
- Species Helix sturanyana Kobelt, 1892 accepted as Fruticicola fedtschenkoi (E. von Martens, 1874)
- Species Helix sturmiana L. Pfeiffer, 1853 accepted as Afrorhytida kraussi kraussi (L. Pfeiffer, 1846)
- Species Helix stutchburyi L. Pfeiffer, 1857 accepted as Galadistes stutchburyi (L. Pfeiffer, 1857)
- Species Helix stylodon L. Pfeiffer, 1842 accepted as Erepta stylodon (L. Pfeiffer, 1842)
- Species Helix suarezensis Crosse & P. Fischer, 1877 accepted as Ampelita suarezensis (Crosse & P. Fischer, 1877)
- Species Helix suavis L. Pfeiffer, 1857 accepted as Suavitas suavis (L. Pfeiffer, 1857)
- Species Helix subacuta L. Pfeiffer, 1867 accepted as Lucerna subacuta (L. Pfeiffer, 1867)
- Species Helix subangulata Reeve, 1854
- Species Helix subangulosa Zieten, 1832 † accepted as Metazonites subangulosus (Zieten, 1832) †
- Species Helix subaperta Ancey, 1893 accepted as Cantareus subapertus (Ancey, 1893)
- Species Helix subapicalis F. Sandberger, 1872 † accepted as Leucochroopsis apicalis (Reuss, 1861) †
- Species Helix subaquila Shuttleworth, 1854 accepted as Hyalosagda subaquila (Shuttleworth, 1854)
- Species Helix subcallifera Reeve, 1854 accepted as Caseolus subcalliferus (Reeve, 1854)
- Species Helix subcantiana Bourguignat, 1862 † accepted as Theba subcantiana (Bourguignat, 1862) †
- Species Helix subcarinata Montagu, 1803 accepted as Tornus subcarinatus (Montagu, 1803)
- Species Helix subcarinata W. Wood, 1828 accepted as Leptoxis carinata (Bruguière, 1789)
- Species Helix subcarinata Thomä, 1845 † accepted as Palaeotachea thomaeana H. Nordsieck, 2014 †
- Species Helix subcarinata Menke, 1828
- Species Helix subcastanea L. Pfeiffer, 1842 accepted as Isomeria globosa (Broderip, 1832)
- Species Helix subcellaria Thomä, 1845 † accepted as Retinella (Lyrodiscus) subcellaria (Thomä, 1845) †
- Species Helix subchinensis Möllendorff, 1884 accepted as Aegista subchinensis (Möllendorff, 1884)
- Species Helix subcincta Heude, 1888 accepted as Helix subcinctula Heude, 1890
- Species Helix subcinctula Heude, 1890
- Species Helix subcoacta Gassies, 1870 accepted as Andrefrancia subcoacta (Gassies, 1870)
- Species Helix subconica C. B. Adams, 1845 accepted as Dialeuca subconica (C. B. Adams, 1845)
- Species Helix subconoidea Reeve, 1854
- Species Helix subconstricta Souverbie, 1873 † accepted as Trissexodon subconstrictus (Souverbie, 1873) †
- Species Helix subcontorta A. d'Orbigny, 1852 † accepted as Klikia subcontorta (A. d'Orbigny, 1852) †
- Species Helix subconvexa L. Pfeiffer, 1855
- Species Helix subcornea L. Pfeiffer, 1860 accepted as Sarika subcornea (L. Pfeiffer, 1860)
- Species Helix subcornea L. Pfeiffer, 1861 accepted as Tanychlamys subcornea (L. Pfeiffer, 1861)
- Species Helix subcorpulentus E. A. Smith, 1889 accepted as Tradeustoma subcorpulenta (E. A. Smith, 1889)
- Species Helix subcylindrica Linnaeus, 1767 accepted as Truncatella subcylindrica (Linnaeus, 1767)
- Species Helix subdecussata L. Pfeiffer, 1857 accepted as Euplecta subdecussata (L. Pfeiffer, 1857)
- Species Helix subdepressa A. d'Orbigny, 1852 † accepted as Aegopis subdepressus (A. d'Orbigny, 1852) †
- Species Helix subechinata Deshayes, 1870
- Species Helix subelliptica Mousson, 1869 accepted as Isomeria subelliptica (Mousson, 1869)
- Species Helix suberecta Clessin, 1878 accepted as Trochulus suberectus (Clessin, 1878) †
- Species Helix suberina Bérenguier, 1882 accepted as Urticicola suberinus (Bérenguier, 1882)
- Species Helix subfunebris Mabille, 1886 accepted as Ampelita xystera (L. Pfeiffer, 1841)
- Species Helix subfusca L. Pfeiffer, 1849 accepted as Pseudhelicarion subfuscus (L. Pfeiffer, 1849)
- Species Helix subfusca Poey, 1853 accepted as Hemitrochus fuscolabiatus (Poey, 1858)
- Species Helix subglobosa Grateloup, 1828 † accepted as Palaeotachea subglobosa (Grateloup, 1828) †
- Species Helix subglobosa A. Binney, 1837 accepted as Cepaea hortensis (O. F. Müller, 1774)
- Species Helix subgranosa Le Guillou, 1842 accepted as Xanthomelon durvillii (Hombron & Jacquinot, 1841)
- Species Helix subgravida Mabille, 1882 accepted as Hemicycla glyceia (Mabille, 1882)
- Species Helix subgriseola Heude, 1888
- Species Helix subhyalina L. Pfeiffer, 1867 accepted as Perpolita dalliana (Pilsbry, 1889)
- Species Helix subiberica Fagot, 1888 accepted as Xerocrassa ripacurcica (Bofill, 1886)
- Species Helix subinflexa Mabille, 1889 accepted as Plectotropis subinflexa (Mabille, 1889)
- Species Helix subintersecta Bourguignat, 1882 accepted as Candidula intersecta (Poiret, 1801)
- Species Helix subinvoluta F. Sandberger, 1875 † accepted as Helicodonta subinvoluta (F. Sandberger, 1875) †
- Species Helix subjecta W. H. Benson, 1852 accepted as Tanychlamys subjecta (W. H. Benson, 1852)
- Species Helix subkrynickiana Mousson, 1861 accepted as Helix krynickii Krynicki, 1833
- Species Helix sublabyrinthica F. E. Edwards, 1852 † accepted as Acanthinula sublabyrinthica (F. E. Edwards, 1852) †
- Species Helix sublallementiana Pallary, 1899
- Species Helix sublecta Maltzan, 1884 accepted as Metafruticicola sublecta (Maltzan, 1884)
- Species Helix sublesta W. H. Benson, 1853 accepted as Luinodiscus sublestus (W. H. Benson, 1853)
- Species Helix sublimbata Bourguignat, 1882 accepted as Hygromia limbata sublimbata (Bourguignat, 1882)
- Species Helix sublittoralis Mabille, 1883 accepted as Actinella nitidiuscula (G. B. Sowerby I, 1824)
- Species Helix subluteata Servain, 1880 accepted as Cernuella virgata (Da Costa, 1778)
- Species Helix sublutescens Wenz, 1926 †
- Species Helix submarginalis Klein, 1846 †
- Species Helix submenostosa Fagot, 1879
- Species Helix submeris Mighels, 1844 accepted as Hemitrochus varians (Menke, 1829)
- Species Helix submissa Deshayes, 1874 accepted as Trichobradybaena submissa (Deshayes, 1874)
- Species Helix subnanina Filhol, 1877 † accepted as Palaeoxestina subnanina (Filhol, 1877) †
- Species Helix subnimbosa Kobelt, 1894 accepted as Euhadra subnimbosa (Kobelt, 1894)
- Species Helix subnitens Klein, 1853 † accepted as Aegopinella subnitens (Klein, 1853) †
- Species Helix subnitidiuscula Mabille, 1883 accepted as Plebecula nitidiuscula (G. B. Sowerby I, 1824)
- Species Helix subnivellina Bourguignat, 1883 accepted as Helicella subnivellina (Bourguignat, 1883)
- Species Helix subnuda Mabille, 1889
- Species Helix subobstructa Bourguignat, 1855 accepted as Monacha claustralis (Menke, 1828)
- Species Helix subobvoluta Ancey, 1882 accepted as Amphicoelina subobvoluta (Ancey, 1882)
- Species Helix subopaca Reeve, 1854 accepted as Euplecta subopaca (Reeve, 1854)
- Species Helix suborbicula Dohrn, 1882 accepted as Scolodonta suborbicula (Dohrn, 1882)
- Species Helix suborbicularis E. von Martens, 1879
- Species Helix subparasitica Heude, 1888
- Species Helix subpersonata Middendorff, 1850 accepted as Triodopsis subpersonatum (Middendorff, 1850)
- Species Helix subplana A. Binney, 1842 accepted as Mesomphix subplanus (A. Binney, 1842)
- Species Helix subplicata G. B. Sowerby I, 1824 accepted as Idiomela subplicata (G. B. Sowerby I, 1824)
- Species Helix subplicifera E. A. Smith, 1895 accepted as Dorcasidea subplicifera (E. A. Smith, 1895)
- Species Helix subpulchella F. Sandberger, 1872 † accepted as Vallonia lepida (Reuss, 1849) †
- Species Helix subpyramidalis C. B. Adams, 1845 accepted as Aerotrochus subpyramidalis (C. B. Adams, 1845)
- Species Helix subrepta Hombron & Jacquinot, 1847 accepted as Megalacron boivini (Petit de la Saussaye, 1841)
- Species Helix subrogata L. Pfeiffer, 1853 accepted as Xerocrassa subrogata (L. Pfeiffer, 1853)
- Species Helix subrostrata Terver, 1839
- Species Helix subrudis Reeve, 1854 accepted as Oreohelix subrudis (Reeve, 1854)
- Species Helix subrufescens J. S. Miller, 1822 accepted as Zenobiella subrufescens (J. S. Miller, 1822)
- Species Helix subrugata Reeve, 1852 accepted as Nitor subrugatus (Reeve, 1852)
- Species Helix subrugosa Legrand, 1871 accepted as Kannaropa subrugosa (Legrand, 1871)
- Species Helix subrugosa Deshayes, 1874 accepted as Cathaica subrugosa (Deshayes, 1874)
- Species Helix subrugulosa Quenstedt, 1867 † accepted as Omphalosagda subrugulosa (Quenstedt, 1867) †
- Species Helix subrutila Mighels, 1845 accepted as Kaala subrutila (Mighels, 1845)
- Species Helix subsarinica Locard, 1894 †
- Species Helix subsecta Tate, 1880 accepted as Microxeromagna lowei (Potiez & Michaud, 1838)
- Species Helix subsenilis Crosse, 1862 † accepted as Otala jobaeana subsenilis (Crosse, 1862) †
- Species Helix subsepulcralis Crosse, 1868 accepted as Ampelita subsepulcralis (Crosse, 1868)
- Species Helix subsidialis Crosse, 1870 accepted as Ptychorhytida subsidialis (Crosse, 1870)
- Species Helix subsimilis Deshayes, 1874 accepted as Laeocathaica carinifera (H. Adams, 1870)
- Species Helix subsoluta F. Sandberger, 1858 † accepted as Palaeotachea subglobosa (Grateloup, 1828) †
- Species Helix subsquamulata Heude, 1890 accepted as Ganesella subsquamulata (Heude, 1890)
- Species Helix subsulcosa Thomä, 1845 † accepted as Palaeotachea subsulcosa (Thomä, 1845) †
- Species Helix subtecta L. Pfeiffer, 1855
- Species Helix subterranea Lafon de Cujula, 1806 accepted as Testacella haliotidea Draparnaud, 1801
- Species Helix subtersa Gassies, 1878 accepted as Andrefrancia decreta (Gassies, 1871)
- Species Helix subtetrica Mabille, 1884 accepted as Discula polymorpha polymorpha (R. T. Lowe, 1831)
- Species Helix subtilis Anton, 1838 accepted as Lamprocystis vitrinella (H. Beck, 1838)
- Species Helix subtilissima A. Gould, 1847 accepted as Euconulus subtilissimus (A. Gould, 1847)
- Species Helix subtilisticta F. Sandberger, 1875 † accepted as Pseudochloritis subtilisticta (F. Sandberger, 1875) †
- Species Helix subtrochoides A. d'Orbigny, 1852 † accepted as Cepaea subtrochoides (A. d'Orbigny, 1852) †
- Species Helix subtussulcata L. Pfeiffer, 1863 accepted as Guladentia subtussulcata (L. Pfeiffer, 1863)
- Species Helix subulata Brocchi, 1814 † accepted as Eulima boucheti Landau, La Perna & Marquet, 2006 †
- Species Helix subuliformis Moricand, 1836 accepted as Obeliscus subuliformis (Moricand, 1836)
- Species Helix subvariegata Maltzan, 1883 accepted as Xerocrassa subvariegata (Maltzan, 1883)
- Species Helix subvirescens Bellamy, 1839 accepted as Ponentina subvirescens (Bellamy, 1839)
- Species Helix subvitrea L. Pfeiffer, 1854 accepted as Crystallopsis subvitrea (L. Pfeiffer, 1854)
- Species Helix subvulgata Mabille, 1883 accepted as Actinella nitidiuscula (G. B. Sowerby I, 1824)
- Species Helix subzonata Mousson, 1859 accepted as Josephinella subzonata (Mousson, 1859)
- Species Helix succinea L. Pfeiffer, 1845 accepted as Pseudhelicarion succinea (L. Pfeiffer, 1845)
- Species Helix succinea O. F. Müller, 1774 accepted as Succinea putris (Linnaeus, 1758)
- Species Helix succinea Hombron & Jacquinot, 1841
- Species Helix succinulata Le Guillou, 1842 accepted as Lamprocystis misella (A. Férussac, 1821)
- Species Helix sudensis L. Pfeiffer, 1846 accepted as Pleurodiscus sudensis (L. Pfeiffer, 1846)
- Species Helix suffulta W. H. Benson, 1853 accepted as Erepta odontina (Morelet, 1851)
- Species Helix sulcata O. F. Müller, 1774 accepted as Plicadomus sulcata (O. F. Müller, 1774)
- Species Helix sulcosa L. Pfeiffer, 1854 accepted as Sulcobasis sulcosa (L. Pfeiffer, 1854)
- Species Helix sulfurea Hombron & Jacquinot, 1841
- Species Helix sulphurea C. B. Adams, 1849 accepted as Tonna pennata (Mörch, 1853)
- Species Helix sulphurosa Morelet, 1849 accepted as Polymita sulphurosa (Morelet, 1849)
- Species Helix sultana Dillwyn, 1817 accepted as Sultana sultana (Dillwyn, 1817)
- Species Helix sultana Morelet, 1880 accepted as Rossmaessleria sultana (Morelet, 1880)
- Species Helix sumatrana E. von Martens, 1864
- Species Helix sumichrasti Crosse & P. Fischer, 1872 accepted as Miraverellia sumichrasti (Crosse & P. Fischer, 1872)
- Species Helix superba L. Pfeiffer, 1850 accepted as Acavus superbus (L. Pfeiffer, 1850)
- Species Helix superflexa Locard, 1899 accepted as Xerosecta promissa (Westerlund, 1892)
- Species Helix superflua L. Pfeiffer, 1849 accepted as Oxychilus superfluus (L. Pfeiffer, 1849)
- Species Helix superlita Morelet, 1863 accepted as Tanychlamys superlita (Morelet, 1863)
- Species Helix supertexta L. Pfeiffer, 1845
- Species Helix suppressa Say, 1829 accepted as Ventridens suppressus (Say, 1829)
- Species Helix supracostata Kobelt, 1882
- Species Helix supracostulata Schepman, 1892 accepted as Rhagada supracostulata (Schepman, 1892)
- Species Helix surinamensis L. Pfeiffer, 1872 accepted as Happiella surinamensis (L. Pfeiffer, 1872)
- Species Helix sutilosa Deshayes, 1850 accepted as Cupedora sutilosa (Deshayes, 1850)
- Species Helix suttonensis S. V. Wood, 1872 † accepted as Janulus suttonensis (S. V. Wood, 1872) †
- Species Helix suturalis L. Pfeiffer, 1846 accepted as Trichodiscina suturalis (L. Pfeiffer, 1846)
- Species Helix swainsoni L. Pfeiffer, 1846 accepted as Trochomorpha swainsoni (L. Pfeiffer, 1846)
- Species Helix swainsoniana C. B. Adams, 1851 accepted as Dentellaria tridentina (A. Férussac, 1832)
- Species Helix swettenhami de Morgan, 1885 accepted as Videna timorensis (E. von Martens, 1867)
- Species Helix swifti L. Pfeiffer, 1855
- Species Helix swinhoei L. Pfeiffer, 1866 accepted as Nesiohelix swinhoei (L. Pfeiffer, 1866)
- Species Helix sydneyensis J. C. Cox, 1864 accepted as Oxychilus cellarius (O. F. Müller, 1774)
- Species Helix sylvatica Draparnaud, 1801 accepted as Macularia sylvatica (Draparnaud, 1801)
- Species Helix sylvestris von Alten, 1812 accepted as Euomphalia strigella (Draparnaud, 1801)
- Species Helix symmetrica Craven, 1881 accepted as Microkerkus symmetricus (Craven, 1881)
- Species Helix syrensis L. Pfeiffer, 1846 accepted as Candidula syrensis (L. Pfeiffer, 1846)
- Species Helix syriaca Ehrenberg, 1831 accepted as Monacha syriaca (Ehrenberg, 1831)
- Species Helix syrosina Bourguignat, 1876 accepted as Trochoidea (Xerocrassa) syrensis syrosina (Bourguignat, 1876)
- Species Helix systropha Albers, 1854 accepted as Systrophia systropha (Albers, 1854)
- Species Helix tabescens Legrand, 1871 accepted as Mulathena fordei (Brazier, 1871)
- Species Helix tabida L. Pfeiffer, 1855 accepted as Thysanota tabida (L. Pfeiffer, 1855)
- Species Helix taeniata P. B. Webb & S. Berthelot, 1833 accepted as Disculella madeirensis taeniata (P. B. Webb & S. Berthelot, 1833)
- Species Helix taeniata Westerlund, 1888
- Species Helix tafermica Letourneux & Bourguignat, 1887 accepted as Sabessebia zitanica (Letourneux & Bourguignat, 1887)
- Species Helix tais Hombron & Jacquinot, 1847 accepted as Trochonanina tropidophora (A. Adams & Reeve, 1850)
- Species Helix talcosa A. Gould, 1850 accepted as Trochonanina talcosa (A. Gould, 1850)
- Species Helix taliensis Heude, 1890
- Species Helix talifouensis Heude, 1888
- Species Helix tamarensis Petterd, 1879 accepted as Scelidoropa tamarensis (Petterd, 1879)
- Species Helix tamsiana Dunker, 1847 accepted as Labyrinthus tamsianus (Dunker, 1847)
- Species Helix tanquereyi Crosse & P. Fischer, 1863 accepted as Trichochloritis tanquereyi (Crosse & P. Fischer, 1863)
- Species Helix tanschaurica Gmelin, 1791 accepted as Paludomus tanschaurica (Gmelin, 1791)
- Species Helix tapeina W. H. Benson, 1836 accepted as Aegista tapeina (W. H. Benson, 1836)
- Species Helix taramellii Sacco, 1886 † accepted as Soosia taramellii (Sacco, 1886) †
- Species Helix taranaki L. Pfeiffer, 1846 accepted as Torresitrachia torresiana (Hombron & Jacquinot, 1841)
- Species Helix tarapotoensis J. Moricand, 1858 accepted as Labyrinthus tarapotoensis (J. Moricand, 1858)
- Species Helix tarentina L. Pfeiffer, 1848 accepted as Trochoidea tarentina (L. Pfeiffer, 1848)
- Species Helix tarifensis Bourguignat in Servain, 1881 accepted as Xerosecta reboudiana (Bourguignat, 1863)
- Species Helix tarnieri Pallary, 1899
- Species Helix tarnieri Morelet, 1854 accepted as Oestophora tarnieri (Morelet, 1854)
- Species Helix taslei Crosse, 1874 accepted as Andrefrancia taslei (Crosse, 1874)
- Species Helix tasmaniae J. C. Cox, 1868 accepted as Tasmanoropa tasmaniae (J. C. Cox, 1868)
- Species Helix tasmaniensis G. B. Sowerby I, 1845 † accepted as Rhytida tasmaniensis (G. B. Sowerby I, 1845) †
- Species Helix tassyi Bourguignat, 1884 accepted as Hygromia tassyi (Bourguignat, 1884)
- Species Helix tau L. Pfeiffer, 1861 accepted as Fectola tau (L. Pfeiffer, 1861)
- Species Helix taumantias Tapparone Canefri, 1883 accepted as Canefriula taumantias (Tapparone Canefri, 1883)
- Species Helix taurica Krynicki, 1833 accepted as Helix lucorum Linnaeus, 1758
- Species Helix tavinniensis Garrett, 1872 accepted as Trochomorpha tavinniensis (Garrett, 1872)
- Species Helix taviuniensis Garrett, 1887 accepted as Trochomorpha tavinniensis (Garrett, 1872)
- Species Helix tayloriana A. Adams & Reeve, 1850 accepted as Rhynchotrochus taylorianus (A. Adams & Reeve, 1850)
- Species Helix tchefouensis Crosse & Debeaux, 1864 accepted as Helix munieriana Crosse & Debeaux, 1863
- Species Helix tectiformis G. B. Sowerby I, 1824 accepted as Discula tectiformis (G. B. Sowerby I, 1824)
- Species Helix tectumsinense E. von Martens, 1874 accepted as Pseudiberus tectumsinense (E. von Martens, 1874)
- Species Helix telonensis Mittre, 1842 accepted as Urticicola glabellus telonensis (Mittre, 1842)
- Species Helix templorum Benoit, 1862 accepted as Orculella templorum (Benoit, 1862)
- Species Helix tenella L. Pfeiffer, 1862 accepted as Aegista tenella (L. Pfeiffer, 1862)
- Species Helix tenellula Mabille, 1887 accepted as Kaliella tenellula (Mabille, 1887)
- Species Helix tenera G. B. Sowerby I, 1841 accepted as Cochlodryas mateoi (Bartsch, 1932)
- Species Helix tenerrima C. B. Adams, 1845 accepted as Zaphysema tenerrimum (C. B. Adams, 1845)
- Species Helix tenerrima L. Pfeiffer, 1845 accepted as Zaphysema tenerrimum (C. B. Adams, 1845)
- Species Helix tenietensis Bourguignat, 1870
- Species Helix tennesseensis I. Lea, 1841 accepted as Mesodon elevatus (Say, 1821)
- Species Helix tentaculata Linnaeus, 1758 accepted as Bithynia tentaculata (Linnaeus, 1758)
- Species Helix tentoriolum A. Gould, 1846 accepted as Trochomorpha tentoriolum (A. Gould, 1846)
- Species Helix tenuicostata L. Pfeiffer, 1846 accepted as Paralaoma servilis (Shuttleworth, 1852)
- Species Helix tenuicostata Dunker, 1845
- Species Helix tenuiradiata Quoy & Gaimard, 1832
- Species Helix tenuis L. Pfeiffer, 1845
- Species Helix tenuissima A. Férussac, 1832 accepted as Bulimulus tenuissimus (A. Férussac, 1832)
- Species Helix tenuistria R. A. Philippi, 1855
- Species Helix tenuistriata W. G. Binney & Bland, 1869 accepted as Micrarionta rufocincta (Newcomb, 1864)
- Species Helix tephritis Morelet, 1849 accepted as Hemitrochus tephritis (Morelet, 1849)
- Species Helix tephrodes L. Pfeiffer, 1843 accepted as Helicostyla tephrodes (L. Pfeiffer, 1843)
- Species Helix terceirana Morelet, 1860 accepted as Leptaxis (Leptaxis) terceirana (Morelet, 1860)
- Species Helix terebella O. F. Müller, 1774 accepted as Pyramidella dolabrata (Linnaeus, 1758)
- Species Helix teres Gmelin, 1791
- Species Helix teresae Benoit, 1843 accepted as Pleurodiscus balmei (Potiez & Michaud, 1838)
- Species Helix tergestina Rossmässler, 1837 accepted as Cernuella virgata (Da Costa, 1778)
- Species Helix ternaria Heude, 1890 accepted as Ganesella ternaria (Heude, 1890)
- Species Helix ternatana Le Guillou, 1842 accepted as Trochomorpha ternatana (Le Guillou, 1842)
- Species Helix terrena Clessin, 1874 † accepted as Trochulus hispidus (Linnaeus, 1758)
- Species Helix terrestris Forsskål, 1775
- Species Helix terrosa Locard, 1899 accepted as Cernuella virgata (Da Costa, 1778)
- Species Helix tersannensis Locard, 1878 † accepted as Megalotachea delphinensis (Fontannes, 1876) †
- Species Helix tertiana W. T. Blanford & H. F. Blanford, 1861 accepted as Philalanka tertiana (W. T. Blanford & H. F. Blanford, 1861)
- Species Helix terveriana Grateloup, 1840 accepted as Ampelita lancula (A. Férussac, 1821)
- Species Helix terverii Michaud, 1831 accepted as Xerosecta terverii (Michaud, 1831)
- Species Helix tescorum W. H. Benson, 1853
- Species Helix testae R. A. Philippi, 1844 accepted as Oxychilus canini (Benoit, 1843)
- Species Helix testudinaria Gassies, 1859 accepted as Ptychorhytida testudinaria (Gassies, 1859)
- Species Helix testudo L. Pfeiffer, 1858
- Species Helix tetragona Morelet, 1852 accepted as Sphincterochila tetragona (Morelet, 1852)
- Species Helix tetrazona De Cristofori & Jan, 1832 accepted as Marmorana signata tetrazona (De Cristofori & Jan, 1832)
- Species Helix tetrica R. T. Lowe, 1862 accepted as Discula tetrica (R. T. Lowe, 1862)
- Species Helix tetrodon Möllendorff, 1875 accepted as Metodontia yantaiensis tetrodon (Möllendorff, 1875)
- Species Helix texta Mousson, 1861 accepted as Helix pachya Bourguignat, 1860
- Species Helix textilis Quoy & Gaimard, 1825 accepted as Amastra textilis (Quoy & Gaimard, 1825)
- Species Helix textilis Shuttleworth, 1852 accepted as Canaridiscus textilis (Shuttleworth, 1852)
- Species Helix textrina W. H. Benson, 1856 accepted as Hemiplecta textrina (W. H. Benson, 1866)
- Species Helix textrix L. Pfeiffer, 1855 accepted as Andrefrancia costulifera (Reeve, 1854)
- Species Helix thais L. Pfeiffer, 1849 accepted as Mendana thais (L. Pfeiffer, 1849)
- Species Helix thamnivaga Mabille, 1884 accepted as Arianta arbustorum (Linnaeus, 1758)
- Species Helix thamnoica A. d'Orbigny, 1835 accepted as Bocourtia thamnoica (A. d'Orbigny, 1835)
- Species Helix thanasima Mabille, 1883 accepted as Hemicycla consobrina consobrina (A. Férussac, 1822)
- Species Helix thatcheri J. C. Cox, 1870 accepted as Figuladra appendiculata (Reeve, 1854)
- Species Helix thaumalea Mabille, 1882 accepted as Hemicycla sarcostoma (P. B. Webb & S. Berthelot, 1833)
- Species Helix thelica Mabille, 1884
- Species Helix themera Mabille, 1883 accepted as Hemicycla gaudryi (A. d'Orbigny, 1839)
- Species Helix themita Mabille, 1884
- Species Helix theobryta Mabille, 1889
- Species Helix theodori De Stefani, 1880 † accepted as Canariella theodori (De Stefani, 1880) †
- Species Helix theodori R. A. Philippi, 1847 accepted as Hemiplecta theodori (R. A. Philippi, 1847)
- Species Helix therasina A. Letourneux, 1884
- Species Helix thersites Broderip, 1841 accepted as Chloraea thersites (Broderip, 1841)
- Species Helix thespesia Mabille, 1882 accepted as Hemicycla consobrina retrodens (Mousson, 1872)
- Species Helix thessalica O. Boettger, 1886
- Species Helix thetis L. Pfeiffer, 1851
- Species Helix thibetica Deshayes, 1870
- Species Helix thieroti de Morgan, 1885 accepted as Videna timorensis (E. von Martens, 1867)
- Species Helix thiesseana Kobelt, 1878 accepted as Helix borealis Mousson, 1859
- Species Helix thomaeana A. Braun, 1851 † accepted as Oxychilus deplanatus (Thomä, 1845) †
- Species Helix thomasi Reeve, 1854 accepted as Scolodonta thomasi (Reeve, 1854)
- Species Helix thomsoni L. Pfeiffer, 1871 accepted as Helicostyla thomsoni (L. Pfeiffer, 1871)
- Species Helix thoracica Heude, 1882 accepted as Ganesella thoracica (Heude, 1882)
- Species Helix thoryna Mabille, 1882 accepted as Hemicycla pouchet (A. Férussac, 1821)
- Species Helix thwaitesi Reeve, 1854 accepted as Philalanka thwaitesi (Reeve, 1854)
- Species Helix thymorum von Alten, 1812 accepted as Candidula unifasciata (Poiret, 1801)
- Species Helix thyreoides [sic] accepted as Mesodon thyroidus (Say, 1817)
- Species Helix thyreus W. H. Benson, 1852 accepted as Ariophanta thyreus (W. H. Benson, 1852)
- Species Helix thyroides [sic] accepted as Helix thyroidus Say, 1817
- Species Helix thyroidus Say, 1817 accepted as Mesodon thyroidus (Say, 1817)
- Species Helix tiani Bourguignat, 1882 accepted as Eremina desertella (Jickeli, 1872)
- Species Helix tiara Mighels, 1845 accepted as Nesophila tiara (Mighels, 1845)
- Species Helix tiarella P. B. Webb & S. Berthelot, 1833 accepted as Geomitra tiarella (P. B. Webb & S. Berthelot, 1833)
- Species Helix tiberiana Benoit, 1857
- Species Helix ticaonica Broderip, 1841 accepted as Helicostyla ticaonica (Broderip, 1841)
- Species Helix tichostoma L. Pfeiffer, 1839 accepted as Volvidens tichostoma (L. Pfeiffer, 1839)
- Species Helix tickelli Theobald, 1859
- Species Helix tigri P. Fischer, 1857 accepted as Otala tigri (P. Fischer, 1857)
- Species Helix tigrina De Cristofori & Jan, 1832 accepted as Chilostoma tigrinum (De Cristofori & Jan, 1832)
- Species Helix tilii Anton, 1838
- Species Helix timida Hombron & Jacquinot, 1841
- Species Helix timidula Fagot, 1879
- Species Helix tineana Benoit, 1862 accepted as Cernuella tineana (Benoit, 1862)
- Species Helix tingitana Paladilhe, 1875 accepted as Otala tingitana (Paladilhe, 1875)
- Species Helix tingitana Beck, 1837
- Species Helix tissotiana Bourguignat, 1887 accepted as Xeroplana tissotiana (Bourguignat, 1887)
- Species Helix todarum W. T. Blanford & H. F. Blanford, 1861 accepted as Eurychlamys todarum (W. T. Blanford & H. F. Blanford, 1861)
- Species Helix tohenica Bourguignat, 1882 accepted as Eremina desertella (Jickeli, 1872)
- Species Helix tollini W. H. Benson, 1856 accepted as Trachycystis tollini (W. H. Benson, 1856)
- Species Helix tollini Albers, 1857 accepted as Trachycystis tollini (W. H. Benson, 1856)
- Species Helix tomasinelliana Tapparone Canefri, 1883 accepted as Canefriula tomasinelliana (Tapparone Canefri, 1883)
- Species Helix tomentosa Reeve, 1854 accepted as Chloritis tomentosa (Reeve, 1854)
- Species Helix tomigeroides S. Moricand, 1846 accepted as Biotocus turbinatus (L. Pfeiffer, 1845)
- Species Helix tomsetti Tate, 1887 accepted as Cupedora tomsetti (Tate, 1887)
- Species Helix tomsoni Brazier, 1876 accepted as Steorra tomsoni (Brazier, 1876)
- Species Helix tongana Quoy & Gaimard, 1832 accepted as Diastole tongana (Quoy & Gaimard, 1832)
- Species Helix tonnensis F. Sandberger, 1873 † accepted as Cepaea nemoralis tonnensis (F. Sandberger, 1873) †
- Species Helix torallii A. d'Orbigny, 1835 accepted as Bostryx torallii (A. d'Orbigny, 1835)
- Species Helix torpida Fagot, 1879
- Species Helix torrefacta C. B. Adams, 1849 accepted as Sagda torrefacta (C. B. Adams, 1849)
- Species Helix torrefacta R. T. Lowe, 1861
- Species Helix torresiana Hombron & Jacquinot, 1841 accepted as Torresitrachia torresiana (Hombron & Jacquinot, 1841)
- Species Helix torresii Forbes, 1852 accepted as Torresitrachia torresiana (Hombron & Jacquinot, 1841)
- Species Helix torticollis Le Guillou, 1842 accepted as Cristigibba torticollis (Le Guillou, 1842)
- Species Helix tortilabia R. P. Lesson, 1831 accepted as Cristigibba tortilabia (R. P. Lesson, 1831)
- Species Helix tortilis Morelet, 1863 accepted as Happia tortilis (Morelet, 1863)
- Species Helix torulus A. Férussac, 1820 accepted as Rhagada torulus (A. Férussac, 1820)
- Species Helix torus Matheron, 1843 †
- Species Helix toukriana Bourguignat, 1884 accepted as Eobania vermiculata (O. F. Müller, 1774)
- Species Helix toulai Kojumdgieva, 1969 † accepted as Helix kadolskyi Neubauer & Harzhauser, 2023 †
- Species Helix tourannensis Souleyet, 1842 accepted as Acusta tourannensis (Souleyet, 1842)
- Species Helix tournefortiana A. Férussac, 1821 accepted as Chondrus tournefortianus (A. Férussac, 1821)
- Species Helix tournoueri Crosse, 1868 accepted as Camaenella platyodon (L. Pfeiffer, 1846)
- Species Helix townsendiana I. Lea, 1838 accepted as Allogona townsendiana (I. Lea, 1838)
- Species Helix trachelodes Menke, 1845 accepted as Heterostoma pauperculum (R. T. Lowe, 1831)
- Species Helix trailli L. Pfeiffer, 1855 accepted as Mesanella trailli (L. Pfeiffer, 1855)
- Species Helix trajectura Legrand, 1871 accepted as Mulathena fordei (Brazier, 1871)
- Species Helix tranquebarica L. Pfeiffer, 1847 accepted as Ariophanta semirugata (H. Beck, 1837)
- Species Helix tranquilla Legrand, 1871 accepted as Mulathena fordei (Brazier, 1871)
- Species Helix transarata Mousson, 1865 accepted as Trochomorpha transarata (Mousson, 1865)
- Species Helix transitoria L. Pfeiffer, 1855
- Species Helix translucens L. Pfeiffer & Gundlach, 1860
- Species Helix translucida Quoy & Gaimard, 1832 accepted as Papuina translucida (Quoy & Gaimard, 1832)
- Species Helix translucida Mortillet, 1853 accepted as Oxychilus translucidus (Mortillet, 1853)
- Species Helix transversalis Mousson, 1857 accepted as Chloritis transversalis (Mousson, 1857)
- Species Helix traskii Newcomb, 1861 accepted as Helminthoglypta traskii traskii (Newcomb, 1861)
- Species Helix travancorica W. H. Benson, 1865 accepted as Euplecta travancorica (W. H. Benson, 1865)
- Species Helix trenquelleonis L. Pfeiffer, 1850 accepted as Epiphragmophora trenquelleonis (L. Pfeiffer, 1850)
- Species Helix trepidulina Pollonera, 1892 accepted as Cernuella neglecta (Draparnaud, 1805)
- Species Helix triaria Rossmässler, 1839 accepted as Aspasita triaria (Rossmässler, 1839)
- Species Helix tricarinata W. T. Blanford & H. F. Blanford, 1861 accepted as Philalanka tricarinata (W. T. Blanford & H. F. Blanford, 1861)
- Species Helix tricarinata Megerle von Mühlfeld, 1824 accepted as Valvata cristata O. F. Müller, 1774
- Species Helix tricarinata O. F. Müller, 1774 accepted as Tropidophora tricarinata (O. F. Müller, 1774)
- Species Helix trichocoma Crosse, 1868 accepted as Tropidotropis trichocoma (Crosse, 1868)
- Species Helix trichodes A. d'Orbigny, 1835
- Species Helix trichophora Reuss, 1849 † accepted as Pseudochloritis robusta (Reuss, 1849) †
- Species Helix trichotropis L. Pfeiffer, 1850 accepted as Plectotropis trichotropis (L. Pfeiffer, 1850)
- Species Helix tricolor L. Pfeiffer, 1850 accepted as Crystallopsis tricolor (L. Pfeiffer, 1850)
- Species Helix tridens O. F. Müller, 1774 accepted as Chondrula tridens (O. F. Müller, 1774)
- Species Helix tridentata Say, 1817 accepted as Triodopsis tridentata (Say, 1817)
- Species Helix tridentina A. Férussac, 1832 accepted as Dentellaria tridentina (A. Férussac, 1832)
- Species Helix trifasciata Gmelin, 1790 accepted as Beddomea trifasciata (Gmelin, 1790)
- Species Helix trifilosa L. Pfeiffer, 1854 accepted as Philalanka trifilosa (L. Pfeiffer, 1854)
- Species Helix trigonostoma L. Pfeiffer, 1844 accepted as Leptarionta trigonostoma (L. Pfeiffer, 1844)
- Species Helix trigrammephora A. d'Orbigny, 1835 accepted as Epiphragmophora trigrammephora (A. d'Orbigny, 1835)
- Species Helix trilineata Quoy & Gaimard, 1832 accepted as Bothriembryon kingii (Gray, 1825)
- Species Helix tringa Fagot, 1884 accepted as Cernuella cisalpina (Rossmässler, 1837)
- Species Helix trinitaria L. Pfeiffer, 1858 accepted as Zachrysia trinitaria (L. Pfeiffer, 1858)
- Species Helix triodonta A. d'Orbigny, 1835 accepted as Isomeria triodonta (A. d'Orbigny, 1835)
- Species Helix triodontoides Bland, 1862 accepted as Daedalochila triodontoides (Bland, 1862)
- Species Helix triplicata E. von Martens, 1868 accepted as Labyrinthus triplicatus (E. von Martens, 1868)
- Species Helix tripolitana Germain, 1921 accepted as Helix antiochiensis Kobelt, 1896
- Species Helix tripolitana W. Wood, 1828 accepted as Gyrostomella tripolitana (W. Wood, 1828)
- Species Helix triptycha L. Pfeiffer, 1859 accepted as Sagda triptycha (L. Pfeiffer, 1859)
- Species Helix triscalpta E. von Martens, 1875 accepted as Traumatophora triscalpta (E. von Martens, 1875)
- Species Helix trisinuata E. von Martens, 1867 accepted as Moellendorffia trisinuata (E. von Martens, 1867)
- Species Helix tristani Brongniart, 1810 † accepted as Palaeotachea moroguesi (Brongniart, 1810) †
- Species Helix tristis L. Pfeiffer, 1845 accepted as Tyrrhenaria ceratina (Shuttleworth, 1843)
- Species Helix tristis Quoy & Gaimard, 1825 accepted as Amastra tristis (Quoy & Gaimard, 1825)
- Species Helix tristrami L. Pfeiffer, 1860
- Species Helix tritoniensis Le Guillou, 1842 accepted as Xesta tritoniensis (Le Guillou, 1842)
- Species Helix trizona Rossmässler, 1835 accepted as Cattania trizona (Rossmässler, 1835)
- Species Helix trizonalis Grateloup, 1840 accepted as Cepolella trizonalis (Grateloup, 1840)
- Species Helix trizonaloides A. D. Brown, 1862 accepted as Cepolella trizonaloides (A. D. Brown, 1862)
- Species Helix troberti Petit de la Saussaye, 1841 accepted as Lamelliger troberti (Petit de la Saussaye, 1841)
- Species Helix trochalia W. H. Benson, 1861 accepted as Trachia trochalia (W. H. Benson, 1861)
- Species Helix trochiformis L. Pfeiffer, 1842 accepted as Trochomorpha typus H. B. Baker, 1941
- Species Helix trochiformis Montagu, 1803 accepted as Euconulus trochiformis (Montagu, 1803)
- Species Helix trochiformis A. Férussac, 1821 accepted as Helix trochiformis L. Pfeiffer, 1842
- Species Helix trochiformis Grateloup, 1827 † accepted as Cepaea subtrochoides (A. d'Orbigny, 1852) †
- Species Helix trochilioneides A. d'Orbigny, 1835 accepted as Scolodonta trochilioneides (A. d'Orbigny, 1835)
- Species Helix trochilus Poiret, 1789 accepted as Trochoidea elegans (Gmelin, 1791)
- Species Helix trochiscus L. Pfeiffer, 1861 accepted as Microcystina trochiscus (L. Pfeiffer, 1861)
- Species Helix trochlea L. Pfeiffer, 1846
- Species Helix trochoides Deshayes, 1838 accepted as Megalacron bequaerti Clench & R. D. Turner, 1964
- Species Helix trochoides Grateloup, 1838 † accepted as Cepaea subtrochoides (A. d'Orbigny, 1852) †
- Species Helix trochoides Poiret, 1789 accepted as Trochoidea trochoides (Poiret, 1789)
- Species Helix trochulina Morelet, 1851 accepted as Habroconus trochulinus (Morelet, 1851)
- Species Helix trochus O. F. Müller, 1774 accepted as Asperitas trochus (O. F. Müller, 1774)
- Species Helix trochus Quoy & Gaimard, 1832 accepted as Megalacron bequaerti Clench & R. D. Turner, 1964
- Species Helix trochus Möllendorff, 1887 accepted as Ganesella ulingensis Zilch, 1966
- Species Helix troglodytes Morelet, 1848 accepted as Thapsia troglodytes (Morelet, 1848)
- Species Helix troilus A. Gould, 1846 accepted as Trochomorpha troilus (A. Gould, 1846)
- Species Helix troostiana (I. Lea, 1838) accepted as Daedalochila troostiana (I. Lea, 1838)
- Species Helix tropidophora A. Adams & Reeve, 1850 accepted as Trochonanina tropidophora (A. Adams & Reeve, 1850)
- Species Helix tropifera F. E. Edwards, 1852 † accepted as Paracanariella tropifera (F. E. Edwards, 1852) †
- Species Helix troscheli L. Pfeiffer, 1846 accepted as Hemitrochus troscheli (L. Pfeiffer, 1846)
- Species Helix trotteriana W. H. Benson, 1848 accepted as Sheldonia trotteriana (W. H. Benson, 1848)
- Species Helix trucanini Petterd, 1879 accepted as Planilaoma luckmanii (Brazier, 1877)
- Species Helix trumbulli Linsley, 1845 accepted as Skeneopsis planorbis (O. Fabricius, 1780)
- Species Helix truncata Dillwyn, 1817 accepted as Archegocoptis decapitata (Röding, 1798)
- Species Helix tryoni Newcomb, 1864 accepted as Xerarionta tryoni tryoni (Newcomb, 1864)
- Species Helix tryonii [sic] accepted as Helix tryoni Newcomb, 1864
- Species Helix trypanomphala L. Pfeiffer, 1856
- Species Helix tschetschenica Retowski, 1914 accepted as Caucasigena tschetschenica (Retowski, 1914)
- Species Helix tschudiana R. A. Philippi, 1867 accepted as Epiphragmophora claromphalos (Deville & Hupé, 1850)
- Species Helix tuba Albers, 1854 accepted as Guamampa tuba (Albers, 1854)
- Species Helix tuckeri L. Pfeiffer, 1846 accepted as Trachiopsis tuckeri (L. Pfeiffer, 1846)
- Species Helix tudiculata A. Binney, 1843 accepted as Helminthoglypta tudiculata (A. Binney, 1843)
- Species Helix tuffetii R. P. Lesson, 1831 accepted as Helix (Helicostyla) coniformis A. Férussac, 1821
- Species Helix tugurium W. H. Benson, 1852 accepted as Tanychlamys tugurium (W. H. Benson, 1852)
- Species Helix tukanensis L. Pfeiffer, 1871 accepted as Calocochlea tukanensis (L. Pfeiffer, 1871)
- Species Helix tumens Deshayes, 1850 accepted as Asperitas trochus (O. F. Müller, 1774)
- Species Helix tumida L. Pfeiffer, 1846 accepted as Zaphysema tunicatum (C. B. Adams, 1849)
- Species Helix tumulorum P. B. Webb & S. Berthelot, 1833 accepted as Monilearia tumulorum (P. B. Webb & S. Berthelot, 1833)
- Species Helix tumulus A. Gould, 1846 accepted as Trochomorpha tumulus (A. Gould, 1846)
- Species Helix tunetana L. Pfeiffer, 1850 accepted as Sphincterochila tunetana (L. Pfeiffer, 1850)
- Species Helix tunicata C. B. Adams, 1849 accepted as Zaphysema tunicatum (C. B. Adams, 1849)
- Species Helix tupacii A. d'Orbigny, 1835 accepted as Bocourtia tupacii (A. d'Orbigny, 1835)
- Species Helix tupinieri Eydoux, 1838 accepted as Pedinogyra hayii (J. E. Gray, 1833)
- Species Helix turbinata Deshayes, 1831 accepted as Helix (Helicostyla) coniformis A. Férussac, 1821
- Species Helix turbinata Olivi, 1792
- Species Helix turbinata Cristofori & Jan, 1832
- Species Helix turbinella Heude, 1890
- Species Helix turbinella Morelet, 1851 accepted as Aerotrochus turbinellus (Morelet, 1851)
- Species Helix turbiniformis L. Pfeiffer, 1839 accepted as Lacteoluna turbiniformis (L. Pfeiffer, 1839)
- Species Helix turbiniformis W. H. Benson, 1838 accepted as Sitala turbiniformis (W. H. Benson, 1838)
- Species Helix turbinoides Broderip, 1841 accepted as Helicobulinus turbinoides (Broderip, 1841)
- Species Helix turbo L. Pfeiffer, 1845 accepted as Cochlostyla turbo (L. Pfeiffer, 1845)
- Species Helix turbonella [sic] accepted as Hyalosagda turbinella (Morelet, 1851)
- Species Helix turcica (Holten, 1802) accepted as Xeroleuca turcica (Holten, 1802)
- Species Helix turgens Deshayes, 1850 accepted as Helicobulinus sarcinosa turgens (Deshayes, 1850)
- Species Helix turmalis Morelet, 1889 accepted as Phaulocystis turmalis (Morelet, 1889)
- Species Helix turneri L. Pfeiffer, 1860 accepted as Platyrhytida turneri (L. Pfeiffer, 1860)
- Species Helix turonensis Deshayes, 1832 † accepted as Megalotachea turonensis (Deshayes, 1832) †
- Species Helix turricula Hombron & Jacquinot, 1847 accepted as Libera streptaxon (Reeve, 1852)
- Species Helix turricula R. T. Lowe, 1831 accepted as Wollastonaria turricula (R. T. Lowe, 1831)
- Species Helix turriculata J. C. Cox, 1868 accepted as Sitala normalis (Iredale, 1933)
- Species Helix turriplana Morelet, 1845 accepted as Gittenbergeria turriplana (Morelet, 1845)
- Species Helix turritella A. d'Orbigny, 1835 accepted as Bulimulus turritella (A. d'Orbigny, 1835)
- Species Helix turritella A. Férussac, 1821 accepted as Amastra turritella (A. Férussac, 1821)
- Species Helix tutovana Sevastos, 1922 † accepted as Dinarica tutovana (Sevastos, 1922) †
- Species Helix tutuillae J. C. Cox, 1870
- Species Helix typinsana A. Adams & Reeve, 1850 accepted as Aegista oculus (L. Pfeiffer, 1850)
- Species Helix uberta Locard, 1899 accepted as Cernuella virgata (Da Costa, 1778)
- Species Helix uitenhagensis L. Pfeiffer, 1846 accepted as Xerocystis uitenhagensis (L. Pfeiffer, 1846)
- Species Helix uljanovi Bogachev, 1936 †
- Species Helix umbicula (Shuttleworth, 1852)
- Species Helix umbilicalis Deshayes, 1832 † accepted as Macrozonites turonia Pacaud, 2024 †
- Species Helix umbilicaria Le Guillou, 1842 accepted as Elaphroconcha javacensis (A. Férussac, 1821)
- Species Helix umbilicaris Olivi, 1792
- Species Helix umbilicata Montagu, 1803 accepted as Pyramidula umbilicata (Montagu, 1803)
- Species Helix umbilicata Anton, 1838
- Species Helix umbraculorum J. C. Cox, 1864 accepted as Coneuplecta calculosa (A. Gould, 1852)
- Species Helix umbraculum L. Pfeiffer, 1854 accepted as Laoma mariae (J. E. Gray, 1843)
- Species Helix umbrina Reeve, 1854 accepted as Tanychlamys umbrina (Reeve, 1854)
- Species Helix umbrosa C. Pfeiffer, 1828 accepted as Urticicola umbrosus (C. Pfeiffer, 1828)
- Species Helix umbrosa Hombron & Jacquinot, 1841
- Species Helix uncigera (Petit de la Saussaye, 1838) accepted as Labyrinthus uncigerus (Petit de la Saussaye, 1838)
- Species Helix uncopila Heude, 1882 accepted as Satsuma uncopila (Heude, 1882)
- Species Helix undata Gmelin, 1791 accepted as Limicolaria flammea (O. F. Müller, 1774)
- Species Helix undata [Lightfoot], 1786 accepted as Solaropsis undata ([Lightfoot], 1786)
- Species Helix undina L. Pfeiffer, 1856 accepted as Chloraea undina (L. Pfeiffer, 1856)
- Species Helix undulata Quoy & Gaimard, 1832 accepted as Obba quoyi (Deshayes, 1838)
- Species Helix undulata Gmelin, 1791
- Species Helix ungeri L. Pfeiffer, 1868
- Species Helix unguiculastra E. von Martens, 1864 accepted as Chloritis unguiculastra (E. von Martens, 1864)
- Species Helix unguiculina E. von Martens, 1863 accepted as Chloritis unguiculina (E. von Martens, 1863)
- Species Helix ungulina Linnaeus, 1758 accepted as Chloritis ungulina (Linnaeus, 1758)
- Species Helix unica L. Pfeiffer, 1843 accepted as Orthostylus unicus (L. Pfeiffer, 1843)
- Species Helix unicolor L. Pfeiffer, 1845 accepted as Ampelita unicolor (L. Pfeiffer, 1845)
- Species Helix unidentata Holten, 1802 accepted as Stylodonta unidentata (Holten, 1802)
- Species Helix unidentata Draparnaud, 1805 accepted as Petasina unidentata unidentata (Draparnaud, 1805)
- Species Helix unifasciata Poiret, 1801 accepted as Candidula unifasciata (Poiret, 1801)
- Species Helix unilamellata A. d'Orbigny, 1835 accepted as Helix (Bulimus) unilamellata A. d'Orbigny, 1838
- Species Helix uninodata Gredler, 1890 accepted as Pseudaspasita uninodata (Gredler, 1890)
- Species Helix uniplicata A. Braun, 1851 † accepted as Strobilops (Discostrobilops) uniplicatus (A. Braun, 1851) †
- Species Helix uniplicata A. Férussac, 1827 accepted as Clessinia uniplicata (Férussac, 1827)
- Species Helix unispiralis Montagu, 1803
- Species Helix uranus L. Pfeiffer, 1861 accepted as Ryssota uranus (L. Pfeiffer, 1861)
- Species Helix urarensis J. C. Cox, 1866 accepted as Montidelos urarensis (J. C. Cox, 1866)
- Species Helix urnula L. Pfeiffer, 1855 accepted as Helix urnula Reeve, 1854
- Species Helix urnula Reeve, 1854 accepted as Wainuia urnula (Reeve, 1854)
- Species Helix ursina L. Pfeiffer, 1857 accepted as Chloritis ursina (L. Pfeiffer, 1857)
- Species Helix urvillei Hombron & Jacquinot, 1847 accepted as Helix durvillii Hombron & Jacquinot, 1841
- Species Helix usambarica Craven, 1880 accepted as Tayloria usambarica (Craven, 1880)
- Species Helix usticensis Calcara, 1842 accepted as Ichnusomunda usticensis (Calcara, 1842)
- Species Helix ustilago Röding, 1798 accepted as Limicolaria flammea (O. F. Müller, 1774)
- Species Helix ustulago [sic] accepted as Helix ustilago Röding, 1798
- Species Helix ustulata A. Férussac, 1823
- Species Helix ustulata C. T. Lowe, 1852 accepted as Theba macandrewiana (L. Pfeiffer, 1853)
- Species Helix uter Theobald, 1859 accepted as Hemiplecta uter (Theobald, 1859)
- Species Helix uthicensis Pechaud, 1883 accepted as Helix melanostoma Draparnaud, 1801
- Species Helix utriculina Locard, 1899 accepted as Ponentina ponentina (Morelet, 1845)
- Species Helix uvulifera Shuttleworth, 1852 accepted as Daedalochila uvulifera (Shuttleworth, 1852)
- Species Helix vagoina Gredler, 1887 accepted as Bradybaena vagoina (Gredler, 1887)
- Species Helix vahine L. Pfeiffer, 1849 accepted as Trochomorpha swainsoni (L. Pfeiffer, 1846)
- Species Helix valcourtiana Bourguignat in Servain, 1880 accepted as Candidula gigaxii (L. Pfeiffer, 1847)
- Species Helix valdecarinata A. Braun, 1851 † accepted as Parachloraea oxystoma valdecarinata (A. Braun, 1851) †
- Species Helix valenciennesii Le Guillou, 1842 accepted as Chloraea eydouxi (Hidalgo, 1887)
- Species Helix valenciennii Eydoux, 1838 accepted as Calocochlea valenciennii (Eydoux, 1838)
- Species Helix valentinensis Fontannes, 1880 † accepted as Leucochroopsis valentinensis (Fontannes, 1880) †
- Species Helix valentini Kobelt, 1891
- Species Helix valida C. B. Adams, 1850 accepted as Dentellaria valida (C. B. Adams, 1850)
- Species Helix vallata Heude, 1889 accepted as Sinicola vallata (Heude, 1889)
- Species Helix vallicola Reeve, 1854 accepted as Tanychlamys vallicola (Reeve, 1854)
- Species Helix valtoni Reeve, 1842 accepted as Oligospira valtoni (Reeve, 1842)
- Species Helix valverdensis R. T. Lowe, 1861
- Species Helix vancouverensis I. Lea, 1838 accepted as Haplotrema vancouverense (I. Lea, 1838)
- Species Helix vanikorensis Quoy & Gaimard, 1832 accepted as Partula vanikorensis (Quoy & Gaimard, 1832)
- Species Helix vannaelaeve J. C. Cox, 1870
- Species Helix vannostrandi Bland, 1876 accepted as Triodopsis vannostrandi (Bland, 1876)
- Species Helix vanvincquiae Crosse, 1861 † accepted as Massylaea vanvincquiae (Crosse, 1861) †
- Species Helix vargasiana L. Pfeiffer, 1849 accepted as Caseolus bowdichianus (A. Férussac, 1832) †
- Species Helix variabilis Megerle von Mühlfeld, 1824 accepted as Rissoa variabilis (Megerle von Mühlfeld, 1824)
- Species Helix varians Menke, 1829 accepted as Hemitrochus varians (Menke, 1829)
- Species Helix varica O. F. Müller, 1774 accepted as Lanistes varicus (O. F. Müller, 1774)
- Species Helix varicosa L. Pfeiffer, 1853 accepted as Fectola varicosa (Reeve, 1852)
- Species Helix varicosa Reeve, 1852 accepted as Fectola varicosa (Reeve, 1852)
- Species Helix variegata Gmelin, 1791 accepted as Cornu aspersum (O. F. Müller, 1774)
- Species Helix variolosa L. Pfeiffer, 1846
- Species Helix vasconiensis Noulet, 1854 † accepted as Monacha (Monacha) vasconiensis (Noulet, 1854) †
- Species Helix vatheleti Mabille, 1888
- Species Helix vatonniana Bourguignat, 1867 accepted as Xerotricha vatonniana (Bourguignat, 1867)
- Species Helix vavauensis Baird, 1873 accepted as Lamprocystis vavauensis (Baird, 1873)
- Species Helix vaysseti Marie, 1871 accepted as Diplomphalus vaysseti (Marie, 1871)
- Species Helix veatchii (Newcomb, 1866) accepted as Xerarionta veatchii (Newcomb, 1866)
- Species Helix vectiensis F. E. Edwards, 1852 † accepted as Klikia vectiensis (F. E. Edwards, 1852) †
- Species Helix velascoi Hidalgo, 1867 accepted as Pyrenaearia carascalensis (Michaud, 1831)
- Species Helix velasqueziana Poey, 1858 accepted as Hemitrochus lucipeta (Poey, 1854)
- Species Helix velata Hombron & Jacquinot, 1841 accepted as Brazieria velata (Hombron & Jacquinot, 1841)
- Species Helix vellicata Forbes, 1850 accepted as Haplotrema vancouverense (I. Lea, 1838)
- Species Helix velna Mabille, 1889 accepted as Camaena choboensis (Mabille, 1889)
- Species Helix velutina G. B. Sowerby I, 1841 accepted as Hemitrichiella velutina (G. B. Sowerby I, 1841)
- Species Helix velutina Lamarck, 1822 accepted as Aquebana velutina (Lamarck, 1822)
- Species Helix velutinoides Anton, 1838
- Species Helix vendryesiana Gloyne, 1871 accepted as Discostrobilops hubbardi (A. D. Brown, 1861)
- Species Helix venosus Pease, 1866 accepted as Lamprocystis venosa (Pease, 1866)
- Species Helix ventricosa De Cristofori & Jan, 1832 accepted as Stylodonta unidentata (Holten, 1802)
- Species Helix ventricosa Olivi, 1792
- Species Helix ventrosula L. Pfeiffer, 1846 accepted as Linisa ventrosula (L. Pfeiffer, 1846)
- Species Helix ventulus A. Férussac, 1825 accepted as Leptachatina ventulus (A. Férussac, 1825)
- Species Helix venulata L. Pfeiffer, 1857 accepted as Allodiscus venulatus (L. Pfeiffer, 1857)
- Species Helix venusta Gmelin, 1791 accepted as Polymita venusta (Gmelin, 1786)
- Species Helix veprium Bourguignat, 1882
- Species Helix veracruzensis L. Pfeiffer, 1857 accepted as Patulopsis veracruzensis (L. Pfeiffer, 1857)
- Species Helix vermicularia Michelotti, 1840 † accepted as Eobania vermicularia (Michelotti, 1840) †
- Species Helix vermiculata O. F. Müller, 1774 accepted as Eobania vermiculata (O. F. Müller, 1774)
- Species Helix vermiculites de Boissy, 1840 † accepted as Megalotachea turonensis (Deshayes, 1832) †
- Species Helix vermiculosa Morelet, 1874 accepted as Eremina vermiculosa (Morelet, 1874)
- Species Helix vermiculum R. T. Lowe, 1861 accepted as Mediterranea hydatina (Rossmässler, 1838)
- Species Helix vermiplicata Wollaston, 1878 accepted as Hemicycla vermiplicata (Wollaston, 1878)
- Species Helix vermis Reeve, 1852 accepted as Aegista (Aegista) vermis (Reeve, 1852)
- Species Helix verneaui Mabille, 1882 accepted as Hemicycla perrieri (Mabille, 1882) †
- Species Helix vernicosa Krauss, 1848 accepted as Nata vernicosa (Krauss, 1848)
- Species Helix veronica L. Pfeiffer, 1853
- Species Helix verrilli Ancey, 1887 accepted as Tryonigens remondi (Tryon, 1863)
- Species Helix verrucula Reeve, 1854 accepted as Euplecta verrucula (Reeve, 1854)
- Species Helix versicolor Born, 1778 accepted as Polymita versicolor (Born, 1778)
- Species Helix versipolis A. Férussac, 1821 accepted as Pupa versipolis L. Pfeiffer, 1841
- Species Helix verticillata L. Pfeiffer, 1870 accepted as Candidula verticillata (L. Pfeiffer, 1870)
- Species Helix verticilloides Thomä, 1845 † accepted as Archaeozonites verticilloides (Thomä, 1845) †
- Species Helix verticillus A. Férussac, 1819 accepted as Aegopis verticillus (A. Férussac, 1819)
- Species Helix vertigo Gmelin, 1791 accepted as Vertigo pusilla O. F. Müller, 1774
- Species Helix vesconis Morelet, 1851 accepted as Ampelita vesconis (Morelet, 1851)
- Species Helix vesica I. Lea, 1834
- Species Helix vesica L. Pfeiffer, 1842
- Species Helix vesicalis Lamarck, 1822 accepted as Helicophanta vesicalis (Lamarck, 1822)
- Species Helix vesicula (W. H. Benson, 1838) accepted as Tanychlamys vesicula (W. H. Benson, 1838)
- Species Helix vespertina Morelet, 1860 accepted as Moreletina vespertina (Morelet, 1860)
- Species Helix vesta L. Pfeiffer, 1866 accepted as Petalochlamys vesta (L. Pfeiffer, 1866)
- Species Helix vestalis L. Pfeiffer, 1841 accepted as Xeropicta krynickii (Krynicki, 1833)
- Species Helix vestita Rambur, 1868 accepted as Microxeromagna lowei (Potiez & Michaud, 1838)
- Species Helix veterna Meek & Hayden, 1861 † accepted as Glypterpes veternus (Meek & Hayden, 1861) †
- Species Helix vettonica Servain, 1880 accepted as Xerosecta reboudiana (Bourguignat, 1863)
- Species Helix vetula Gassies, 1858 accepted as Andrefrancia vetula (Gassies, 1858)
- Species Helix vetusta Meek & Hayden, 1860 †
- Species Helix vetusta Morelet & Drouët, 1857 † accepted as Leptaxis vetusta (Morelet & Drouët, 1857) †
- Species Helix vexans Dohrn, 1875 accepted as Labyrinthus vexans (Dohrn, 1875)
- Species Helix vexillaris L. Pfeiffer, 1855 accepted as Papuina vexillaris (L. Pfeiffer, 1855)
- Species Helix vexillum W. Wood, 1828 accepted as Drymaeus vexillum (W. Wood, 1828)
- Species Helix vialaii de Boissy, 1840 † accepted as Paracanariella vialaii (de Boissy, 1840) †
- Species Helix vibrayana Servain, 1889
- Species Helix vicianica Bourguignat in Locard, 1882 accepted as Xerocrassa geyeri (Soós, 1926)
- Species Helix vicina Rossmässler, 1842 accepted as Monachoides vicinus (Rossmässler, 1842)
- Species Helix vicinella Heude, 1890
- Species Helix victoriae J. C. Cox, 1868 accepted as Chloritobadistes victoriae (J. C. Cox, 1868)
- Species Helix victoris Michaud, 1862 † accepted as Lucilla victoris (Michaud, 1862) †
- Species Helix vidaliana Morelet & Drouët, 1857 accepted as Oxychilus miguelinus (L. Pfeiffer, 1856)
- Species Helix vidua Hanley & Theobald, 1876 accepted as Khasiella vidua (Hanley & Theobald, 1876)
- Species Helix vieillardi Crosse & Marie, 1867 accepted as Micromphalia vieillardi (Crosse & Marie, 1867)
- Species Helix vieta Rossmässler, 1836 accepted as Marmorana scabriuscula vieta (Rossmässler, 1836)
- Species Helix vigens Legrand, 1871 accepted as Ammoniropa vigens (Legrand, 1871)
- Species Helix vilipensa W. H. Benson, 1853 accepted as Eurychlamys vilipensa (W. H. Benson, 1853)
- Species Helix villa Mortillet, 1853 accepted as Oxychilus (Oxychilus) adamii (Westerlund, 1886)
- Species Helix villae L. Pfeiffer, 1856 accepted as Oxychilus mortilleti (L. Pfeiffer, 1859)
- Species Helix villae Deshayes, 1850
- Species Helix villaenovae Noulet, 1868 † accepted as Palaeoxestina villaenovae (Noulet, 1868) †
- Species Helix villandrei Gassies, 1865 accepted as Ouagapia villandrei (Gassies, 1865)
- Species Helix villaris Reeve, 1854 accepted as Geminitor villaris (Reeve, 1854)
- Species Helix villaudricensis Noulet, 1868 † accepted as Parachloraea villaudricensis (Noulet, 1868) †
- Species Helix villosa Draparnaud, 1805 accepted as Trochulus villosus (Draparnaud, 1805)
- Species Helix villosella Thomä, 1845 † accepted as Klikia villosella (Thomä, 1845) †
- Species Helix villosulus Rossmässler, 1838 accepted as Trochulus villosulus (Rossmässler, 1838)
- Species Helix vimontianum Crosse, 1874 accepted as Pupisoma vimontianum (Crosse, 1874)
- Species Helix vincentina Crosse, 1870 accepted as Andrefrancia vincentina (Crosse, 1870)
- Species Helix vincta Valenciennes, 1846 accepted as Helminthoglypta californiensis (I. Lea, 1838)
- Species Helix vindobonensis C. Pfeiffer, 1828 accepted as Caucasotachea vindobonensis (C. Pfeiffer, 1828)
- Species Helix vinitincta J. C. Cox, 1868 accepted as Gyrocochlea vinitincta (J. C. Cox, 1868)
- Species Helix vinsoni Deshayes, 1963 accepted as Tachyphasis (Pseudophasis) setiliris (W. H. Benson, 1859)
- Species Helix vipera L. Pfeiffer, 1859 accepted as Solaropsis vipera (L. Pfeiffer, 1859)
- Species Helix virago Bourguignat, 1883 accepted as Helix lucorum Linnaeus, 1758
- Species Helix virescens L. Pfeiffer, 1866 accepted as Hojeda virescens (L. Pfeiffer, 1866)
- Species Helix virescens Studer, 1789 accepted as Eucobresia diaphana (Draparnaud, 1805)
- Species Helix virgata (Da Costa, 1778) accepted as Cernuella virgata (Da Costa, 1778)
- Species Helix virginea Morelet, 1860 accepted as Helix virginia Morelet, 1860
- Species Helix virginia Morelet, 1860 accepted as Dupontia virginia (Morelet, 1860)
- Species Helix virgo Broderip, 1841 accepted as Chloraea virgo (Broderip, 1841)
- Species Helix virgulata A. Férussac, 1821 accepted as Drymaeus elongatus (Röding, 1798)
- Species Helix viridescens Melvill & Ponsonby, 1891 accepted as Natella viridescens (Melvill & Ponsonby, 1891)
- Species Helix viridis Deshayes, 1832 accepted as Eurystyla viridis (Deshayes, 1832)
- Species Helix viridula Menke, 1830 accepted as Perpolita hammonis (Strøm, 1765)
- Species Helix visabunda Mabille, 1898
- Species Helix visayana Möllendorff, 1888 accepted as Plectotropis visayana (Möllendorff, 1888)
- Species Helix vitellina L. Pfeiffer, 1849 accepted as Ariophanta belangeri (Deshayes, 1832)
- Species Helix vitiensis L. Pfeiffer, 1855
- Species Helix vitrea Born, 1778 accepted as Saulea vitrea (Born, 1778)
- Species Helix vitrea A. Férussac, 1821 accepted as Papuina vitrea (A. Férussac, 1821)
- Species Helix vitrea Bonnet, 1864
- Species Helix vitrea Studer, 1820 accepted as Eucobresia diaphana (Draparnaud, 1805)
- Species Helix vitreola Heude, 1890
- Species Helix vitrina J. A. Wagner, 1827 accepted as Systrophiella vitrina (J. A. Wagner, 1827)
- Species Helix vitrina L. Pfeiffer, 1848 accepted as Stauroglypta anthoniana (C. B. Adams, 1849)
- Species Helix vitrinaformis Legrand, 1871 accepted as Helicarion cuvieri A. Férussac, 1821
- Species Helix vitrinoides Deshayes, 1831 accepted as Tanychlamys vitrinoides (Deshayes, 1831)
- Species Helix vitrinoides Meek & Hayden, 1857 † accepted as Helix vetusta Meek & Hayden, 1860 †
- Species Helix vitrinoides sensu Benson, 1836 accepted as Macrochlamys indica Godwin-Austen, 1883
- Species Helix vittata O. F. Müller, 1774 accepted as Pseudotrachia vittata (O. F. Müller, 1774)
- Species Helix vittata A. Adams & Reeve, 1850 accepted as Dyakia regalis (W. H. Benson, 1850)
- Species Helix vivacula Mabille, 1889
- Species Helix vivipara Linnaeus, 1758 accepted as Viviparus viviparus (Linnaeus, 1758)
- Species Helix vladika (Kobelt, 1898)
- Species Helix volhyniensis A. Férussac MS accepted as Faustina faustina (Rossmässler, 1835)
- Species Helix voltzii Deshayes, 1832 † accepted as Oxychilus voltzii (Deshayes, 1832) †
- Species Helix volubilis Reeve, 1851 accepted as Helicostyla speciosa (J. C. Jay, 1836)
- Species Helix volutella Gassies, 1858 accepted as Diplomphalus vaysseti (Marie, 1871)
- Species Helix volutella L. Pfeiffer, 1856 accepted as Oxychilus volutella (L. Pfeiffer, 1856)
- Species Helix volvoxis L. Pfeiffer, 1846 accepted as Polygyra septemvolva Say, 1818
- Species Helix volvulus O. F. Müller, 1774 accepted as Cyclophorus volvulus (O. F. Müller, 1774)
- Species Helix vortex Linnaeus, 1758 accepted as Anisus vortex (Linnaeus, 1758)
- Species Helix vortex L. Pfeiffer, 1839 accepted as Lacteoluna selenina (A. Gould, 1848)
- Species Helix vorticalis W. H. Benson, 1850 accepted as Cyclocystis vorticalis (W. H. Benson, 1850)
- Species Helix vorticellina Heude, 1890
- Species Helix votiophila Bourguignat, 1881 † accepted as Paradrobacia philoscia (Bourguignat, 1881) †
- Species Helix votiva Crosse, 1869
- Species Helix vukotinovici Hirc, 1881
- Species Helix vulgaris Rossmässler, 1839 accepted as Helix albescens Rossmässler, 1839
- Species Helix vulgata R. T. Lowe, 1852 accepted as Actinella nitidiuscula (G. B. Sowerby I, 1824)
- Species Helix vulpina Quoy & Gaimard, 1825 accepted as Achatinella vulpina (Quoy & Gaimard, 1825)
- Species Helix vultuosa A. Gould, 1848 accepted as Triodopsis vultuosa (A. Gould, 1848)
- Species Helix waerzenensis Klika, 1891 † accepted as Monacha (Monacha) waerzenensis (Klika, 1891) †
- Species Helix wagneri L. Pfeiffer, 1841 accepted as Rectartemon wagneri (L. Pfeiffer, 1841)
- Species Helix wairarapa Suter, 1890 accepted as Mitodon wairarapa (Suter, 1890)
- Species Helix walkeriana Hemphill, 1911 accepted as Helminthoglypta walkeriana (Hemphill, 1911)
- Species Helix wallacei L. Pfeiffer, 1858 accepted as Nanina wallacei (L. Pfeiffer, 1858)
- Species Helix wallisiana Mousson, 1869
- Species Helix wanganensis J. C. Cox, 1870
- Species Helix wardiana I. Lea, 1838 accepted as Ventridens ligera (Say, 1821)
- Species Helix waterhousei J. C. Cox, 1868 accepted as Echonitor waterhousei (J. C. Cox, 1868)
- Species Helix watersi Angas, 1877 accepted as Ampelita watersi (Angas, 1877)
- Species Helix watsoni J. Y. Johnson, 1897 accepted as Geomitra watsoni (J. Y. Johnson, 1897)
- Species Helix watsoniana Wollaston, 1878 accepted as Monilearia watsoniana (Wollaston, 1878)
- Species Helix webbiana Lowe, 1831 accepted as Lampadia webbiana (R. T. Lowe, 1831)
- Species Helix weinkauffiana Crosse & P. Fischer, 1863 accepted as Ariophanta weinkauffiana (Crosse & P. Fischer, 1863)
- Species Helix weldii Tenison Woods, 1877 accepted as Miselaoma weldii (Tenison Woods, 1877)
- Species Helix welebitana L. Pfeiffer, 1847 accepted as Perforatella welebitana (L. Pfeiffer, 1847)
- Species Helix wellingtonensis J. C. Cox, 1868 accepted as Thryasona diemenensis (J. C. Cox, 1868)
- Species Helix welschi Pallary, 1899 accepted as Helicopsis welschi (Pallary, 1899)
- Species Helix welwitschi Morelet, 1866 accepted as Rhysotina welwitschi (Morelet, 1866)
- Species Helix wesselensis J. C. Cox, 1868 accepted as Cristigibba wesselensis (J. C. Cox, 1868)
- Species Helix wetherbyi Bland, 1874 accepted as Fumonelix wetherbyi (Bland, 1874)
- Species Helix weyrichii Schrenck, 1867
- Species Helix whartoni J. C. Cox, 1871 accepted as Temporena whartoni (J. C. Cox, 1871)
- Species Helix wheatleyi Bland, 1860 accepted as Fumonelix wheatleyi (Bland, 1860)
- Species Helix whitneyi Newcomb, 1864 accepted as Discus whitneyi (Newcomb, 1864)
- Species Helix wilcoxi J. C. Cox, 1865 accepted as Coneuplecta calculosa (A. Gould, 1852)
- Species Helix wilhelmi L. Pfeiffer, 1866 accepted as Microconus wilhelmi (L. Pfeiffer, 1866)
- Species Helix winteriana L. Pfeiffer, 1842 accepted as Landouria winteriana (L. Pfeiffer, 1842)
- Species Helix woodiana Reeve, 1852 accepted as Tanychlamys woodiana (Reeve, 1852)
- Species Helix woodiana I. Lea, 1834
- Species Helix woodlarkiana Souverbie, 1863 accepted as Rhynchotrochus woodlarkianus (Souverbie, 1863)
- Species Helix woodwardia Mousson, 1872 accepted as Monilearia woodwardia (Mousson, 1872)
- Species Helix wrighti L. Pfeiffer, 1865 accepted as Jeanneretia wrighti (L. Pfeiffer, 1865)
- Species Helix wynyardensis Petterd, 1879 accepted as Stenacapha hamiltoni (J. C. Cox, 1868)
- Species Helix xalonica Servain, 1880 accepted as Cernuella virgata (Da Costa, 1778)
- Species Helix xanthochila L. Pfeiffer, 1861 accepted as Papustyla xanthochila (L. Pfeiffer, 1861)
- Species Helix xanthochroa Crosse, 1867
- Species Helix xanthoderma Möllendorff, 1882 accepted as Camaena hainanensis xanthoderma (Möllendorff, 1882)
- Species Helix xanthodon Anton, 1838 accepted as Otala xanthodon (Anton, 1838)
- Species Helix xanthophaes Pilsbry, 1891 accepted as Hemitrochus gallopavonis (L. Pfeiffer, 1842)
- Species Helix xanthostoma E. von Martens, 1867 accepted as Pyrochilus xanthostoma (E. von Martens, 1867)
- Species Helix xanthostoma A. d'Orbigny, 1835
- Species Helix xanthotricha L. Pfeiffer, 1842 accepted as Hemitrichiella velutina (G. B. Sowerby I, 1841)
- Species Helix xatartii Farines, 1834 accepted as Arianta xatartii (Farines, 1834)
- Species Helix xenilica Servain, 1880 accepted as Candidula gigaxii (L. Pfeiffer, 1847)
- Species Helix xiphias L. Pfeiffer, 1857 accepted as Trochomorpha xiphias (L. Pfeiffer, 1857)
- Species Helix xystera L. Pfeiffer, 1841 accepted as Ampelita xystera (L. Pfeiffer, 1841)
- Species Helix yantaiensis Crosse & Debeaux, 1863 accepted as Metodontia yantaiensis (Crosse & Debeaux, 1863)
- Species Helix yatalaensis J. C. Cox, 1873 accepted as Moretonistes mansueta (Reeve, 1854)
- Species Helix yatesii L. Pfeiffer, 1855 accepted as Labyrinthus ellipsostomus (Reeve, 1854)
- Species Helix ycaunica Mabille, 1881 accepted as Xerocrassa geyeri (Soós, 1926)
- Species Helix yentaiensis Crosse & Debeaux
- Species Helix yleobia Bourguignat, 1883 accepted as Helix straminea Briganti, 1825
- Species Helix yorkensis Reeve, 1854
- Species Helix yucatanea Morelet, 1849 accepted as Polygyra yucatanea (Morelet, 1849)
- Species Helix yulei Forbes, 1852 accepted as Marilynessa yulei (Forbes, 1852)
- Species Helix zaffarina Terver, 1839
- Species Helix zaleta A. Binney, 1837 accepted as Mesodon zaletus (A. Binney, 1837)
- Species Helix zanelliana Benoit, 1862
- Species Helix zanguebarica Craven, 1880 accepted as Afropunctum seminium (Morelet, 1873)
- Species Helix zapateri Hidalgo, 1870 accepted as Gasullia zapateri (Hidalgo, 1870)
- Species Helix zaragozensis Servain, 1880 accepted as Xerocrassa penchinati (Bourguignat, 1868)
- Species Helix zebina Brazier, 1878 accepted as Lamprellia zebina (Brazier, 1878)
- Species Helix zebra L. Pfeiffer, 1850 accepted as Planispira zebra (L. Pfeiffer, 1850)
- Species Helix zebrina R. A. Philippi, 1855 accepted as Amphidoxa zebrina (R. A. Philippi, 1855)
- Species Helix zebuensis Broderip, 1841 accepted as Anixa zebuensis (Broderip, 1841)
- Species Helix zelandiae J. E. Gray, 1843 accepted as Thalassohelix zelandiae (J. E. Gray, 1843)
- Species Helix zelebori L. Pfeiffer, 1853 accepted as Xerocampylaea zelebori (L. Pfeiffer, 1853)
- Species Helix zelina J. C. Cox, 1873
- Species Helix zellii Kurr, 1856 † accepted as Pseudochloritis incrassata (Klein, 1853) †
- Species Helix zelota Mabille, 1883 accepted as Hemicycla ethelema (Mabille, 1882)
- Species Helix zeno Brazier, 1876 accepted as Letitia zeno (Brazier, 1876)
- Species Helix zenobia L. Pfeiffer, 1864 accepted as Trochomorpha zenobia (L. Pfeiffer, 1864)
- Species Helix zenonis Gredler, 1882 accepted as Pseudiberus tectumsinense zenonis (Gredler, 1882)
- Species Helix zeta L. Pfeiffer, 1853 accepted as Fectola infecta (Reeve, 1852)
- Species Helix zeugitana Letourneux & Bourguignat, 1887 accepted as Xeroplana zeugitana (Letourneux & Bourguignat, 1887)
- Species Helix zeus Jonas, 1843 accepted as Lamarckiella zeus (Jonas, 1843)
- Species Helix zeus L. Pfeiffer, 1843
- Species Helix zhorquinensisis Angas, 1879 accepted as Leptarionta zhorquinensisis (Angas, 1879)
- Species Helix ziczac A. Gould, 1846 accepted as Phenacohelix ziczac (A. Gould, 1846)
- Species Helix ziegleri Rossmässler, 1836 accepted as Kosicia ziegleri (Rossmässler, 1836)
- Species Helix zippei Reuss, 1849 † accepted as Pseudomonacha zippei (Reuss, 1849) †
- Species Helix zitanica Letourneux & Bourguignat, 1887 accepted as Sabessebia zitanica (Letourneux & Bourguignat, 1887)
- Species Helix zoae L. Pfeiffer, 1865
- Species Helix zodiaca A. Férussac, 1821 accepted as Tricheulota zodiacus (A. Férussac, 1821)
- Species Helix zographica A. d'Orbigny, 1835 accepted as Helix zoographica A. d'Orbigny, 1835
- Species Helix zollingeri Reeve, 1852
- Species Helix zonaria Linnaeus, 1767 accepted as Planispira zonaria (Linnaeus, 1767)
- Species Helix zonella L. Pfeiffer, 1865 accepted as Metafruticicola zonella (L. Pfeiffer, 1865)
- Species Helix zonifera L. Pfeiffer, 1842 accepted as Calocochlea zonifera (L. Pfeiffer, 1842)
- Species Helix zonites L. Pfeiffer, 1846 accepted as Mesomphix zonites (L. Pfeiffer, 1846)
- Species Helix zonitomaea A. Letourneux, 1870 accepted as Monacha zonitomaea (A. Letourneux, 1870)
- Species Helix zonulata A. Férussac, 1821 accepted as Albersia zonulata (A. Férussac, 1821)
- Species Helix zoographica A. d'Orbigny, 1835 accepted as Drymaeus zoographicus (A. d'Orbigny, 1835)
- Species Helix zorgia Mabille, 1883 accepted as Hemicycla gaudryi (A. d'Orbigny, 1839)
- Species Helix zorica Mabille, 1889
- Species Helix zoroaster Theobald, 1859
- Species Helix zosterophora Reeve, 1854
- Genus Isaurica Kobelt, 1901 (5)
- Genus Levantina Kobelt, 1871 (21)
- Genus Lindholmia P. Hesse, 1918 (3)
- Genus Maltzanella P. Hesse, 1917 (3)
- Genus Maltzania P. Hesse, 1908 accepted as Maltzanella P. Hesse, 1917
- Genus Megastoma Scudder, 1882 accepted as Helix Linnaeus, 1758
- Genus Naegelea P. Hesse, 1918 accepted as Helix (Pelasga) P. Hesse, 1908
- Genus Neocrassa Subai, 2005 (1)
- Genus Pachyphallus P. Hesse, 1918 accepted as Helix Linnaeus, 1758
- Genus Pentataenia A. Schmidt, 1855 accepted as Helix Linnaeus, 1758
- Genus Physospira C. R. Boettger, 1914 accepted as Helix Linnaeus, 1758
- Genus Pomatia H. Beck, 1837 accepted as Helix Linnaeus, 1758
- Genus Pomatia Röding, 1798
- Genus Pomatiella Pallary, 1909 accepted as Helix Linnaeus, 1758
- Genus Pseudofigulina P. Hesse, 1917 accepted as Helix (Pelasga) P. Hesse, 1908
- Genus Rhododerma P. Hesse, 1918 accepted as Helix Linnaeus, 1758
- Genus Steklovia Schileyko, 1978 accepted as Caucasotachea C. R. Boettger, 1909
- Genus Stekloviella Schileyko, 1979 accepted as Caucasotachea C. R. Boettger, 1909
- Genus Tacheopsis C. R. Boettger, 1909 accepted as Helix Linnaeus, 1758
- Genus Tyrrhenaria P. Hesse, 1918 accepted as Helix Linnaeus, 1758
- Tribe Maculariini Neiber, Korábek, Glaubrecht & Hausdorf, 2021 (3)
- Tribe Otalini G. Pfeffer, 1930 accepted as Thebini Wenz, 1923
- Tribe Thebini Wenz, 1923 (74)
- Genus Creneatachea Zilch, 1960 † (1)
- Genus Frechenia Schlickum & Strauch, 1971 † (6)
- Genus Holcotachea Pfeffer, 1930 † accepted as Megalotachea Pfeffer, 1930 †
- Genus Megalotachea Pfeffer, 1930 † (14)
- Genus Mesotachea Pfeffer, 1930 † accepted as Palaeotachea Jooss, 1912 †
- Genus Metachloraea Pfeffer, 1930 † accepted as Parachloraea F. Sandberger, 1873 †
- Genus Odontotachea Pfeffer, 1930 † accepted as Palaeotachea Jooss, 1912 †
- Genus Palaeotachea Jooss, 1912 † (14)
- Genus Parachloraea F. Sandberger, 1873 † (11)
- Genus Schlickumia Truc, 1971 † (3)
- Genus Titthodomus Pfeffer, 1930 † (1)
- Genus Trachytachea Pfeffer, 1930 † accepted as Megalotachea Pfeffer, 1930 †
- Subfamily Murellinae P. Hesse, 1918 (25)
- Tribe Clausiliana J. E. Gray, 1855 accepted as Clausiliidae J. E. Gray, 1855
- Genus Cingulifera Held, 1838 accepted as Chilostoma (Cingulifera) Held, 1838
- Genus Nanhaispira W. Yü & X.-Q. Zhang, 1982 † (1)
- Genus Pachytachea Pfeffer, 1930 † accepted as Palaeotachea Jooss, 1912 †
- Genus Praecampylaea Pfeffer, 1930 † (1)
- Genus Procampylaea Gaál, 1910 † accepted as Pseudochloritis C. R. Boettger, 1909 †
- Family Helicodontidae Kobelt, 1904 (26)
- Family Helminthoglyptidae Pilsbry, 1939 accepted as Helminthoglyptinae Pilsbry, 1939
- Family Humboldtianidae Pilsbry, 1939 accepted as Humboldtianinae Pilsbry, 1939
- Family Hygromiidae Tryon, 1866 (460)
- Family Jacostidae Pilsbry, 1948 accepted as Helicellini Ihering, 1909
- Family Labyrinthidae Borrero, Sei, D. G. Robinson & Rosenberg, 2017 (58)
- Family Lampadiidae Winckworth, 1945 accepted as Labyrinthidae Borrero, Sei, D. G. Robinson & Rosenberg, 2017
- Family Leucochroidae Westerlund, 1886 accepted as Sphincterochilinae Zilch, 1960 (1886)
- Family Lysinoidae Hoffmann, 1928 accepted as Lysinoinae Hoffmann, 1928
- Family Monadeniidae H. Nordsieck, 1987 accepted as Monadeniinae H. Nordsieck, 1987
- Family Papuinidae Iredale, 1938 accepted as Hadrinae Iredale, 1937
- Family Pentataeniidae Mörch, 1864 accepted as Helicini Rafinesque, 1815
- Family Planispiridae Iredale, 1941 accepted as Hadrinae Iredale, 1937
- Family Pleurodontidae Ihering, 1912 (57)
- Family Polygyridae Pilsbry, 1895 (311)
- Family Rhagadidae Iredale, 1938 accepted as Hadrinae Iredale, 1937
- Family Sphincterochilidae Zilch, 1960 (1886) (41)
- Family Thysanophoridae Pilsbry, 1926 (42)
- Family Trichodiscinidae H. Nordsieck, 1987 (11)
- Family Trissexodontidae H. Nordsieck, 1987 (46)
- Family Xanthonychidae Strebel & Pfeffer, 1880 (345)
- Tribe Canariellini Schileyko, 1991 accepted as Canariellidae Schileyko, 1991
- Genus Laxecostula Harzhauser & Neubauer, 2020 † (1)
- Superfamily Sagdoidea Pilsbry, 1895 (200)
- Infraorder Limacoidei (4 251)
- Infraorder Oleacinoidei (497)
- Infraorder Orthalicoidei (1 581)
- Infraorder Partuloinei accepted as Pupilloidei
- Infraorder Pupilloidei (3 436)
- Infraorder Rhytidoidei (581)
- Infraorder Sagdoinei accepted as Helicoidei
- Infraorder Succineoidei (384)
- Suborder Orthurethra accepted as Pupilloidei
- Suborder Scolodontina (165)
- Suborder Sigmurethra accepted as Helicina
- Suborder Stylommatophora incertae sedis (75)
- Order Systellommatophora (224)
- Superorder Hygrophila (2 005)
- Superorder Pneumopulmonata
- Superorder Pylopulmonata (4 285)
- Superorder Sacoglossa (391)
- Superorder Siphonarimorpha (163)
- Order Anaspidea accepted as Aplysiida
- Order Aplysiida (101)
- Order Aplysiomorpha accepted as Aplysiida
- Order Archaeopulmonata accepted as Siphonarioidea Gray, 1827
- Order Bullomorpha accepted as Cephalaspidea
- Order Cephalaspidea (1 034)
- Order Heterostropha accepted as Pyramidellidae J. E. Gray, 1840
- Order Pteropoda (414)
- Order Runcinacea accepted as Runcinida
- Order Runcinida (80)
- Order Tectibranchiata
- Order Thecosomata
- Order Umbraculida (15)
- Superorder Euthyneura incertae sedis
- Infraclass Heterobranchia incertae sedis (478)
- Infraclass Mesoneura (108)
- Infraclass Opisthobranchia
- Infraclass Pulmonata
- Subclass Neomphaliones accepted as Vetigastropoda
- Subclass Neritimorpha (1 914)
- Subclass Orthogastropoda represented as Gastropoda
- Subclass Patellogastropoda (511)
- Subclass Prosobranchia
- Subclass Psilogastropoda represented as Gastropoda
- Subclass Vetigastropoda (6 782)
- Class Lamellibranchiata accepted as Bivalvia
- Class Loricata accepted as Polyplacophora
- Class Mollusca incertae sedis † (372)
- Class Monoplacophora (229)
- Class Pelecypoda accepted as Bivalvia
- Class Polyplacophora (1 377)
- Class Polyplaxiphora accepted as Polyplacophora
- Class Rostroconchia † (64)
- Class Scaphopoda (752)
- Class Solenoconchia accepted as Scaphopoda
- Class Solenogastres (313)
- Subclass Chaetodermomorpha accepted as Caudofoveata
