Acmaea catalaunensis Cossmann, 1913 † (original description)
Allixia Cossmann, 1913 † accepted as Pelycidion P. Fischer, 1873 (original description)
Capulus larochei Cossmann, 1913 † (original description)
Cardium (Trachycardium) moloti Staadt, 1913 † accepted as Orthocardium moloti (Staadt, 1913) † (original description)
Carychium cylindroides Staadt, 1913 † (redescription)
Carychium nincki Cossmann, 1913 † (redescription)
Carychium sparnacense var. polysarcum Cossmann, 1913 † accepted as Ovicarychium polysarcum (Cossmann, 1913) † (original description)
Clausilia sinuata (Michaud, 1838) † accepted as Oospiroides sinuatus (Michaud, 1838) † (basis of record)
Clausilia sinuata mut. lignitarum Cossmann, 1913 † accepted as Oospiroides sinuatus lignitarum Wenz, 1923 † (original description (unavailable nomenclaturally))
Corbula moloti Cossmann, 1913 † (original description)
Crenimargo inaequicrenata Cossmann, 1902 † accepted as Sita crenulata (Deshayes, 1858) † (source of synonymy)
Cylindrellina sparnacensis Cossmann, 1913 † accepted as Paradistoechia sparnacensis (Cossmann, 1913) † (original description)
Delphinula reynieri Cossmann, 1913 † accepted as Angaria reynieri (Cossmann, 1913) † (original description)
Discors mirabilis Staadt, 1913 † accepted as Discors mirabile Staadt, 1913 † (original description)
Fissurella fenauxi Cossmann, 1913 † accepted as Diodora fenauxi (Cossmann, 1913) † (original description)
Glandina hypermeces Staadt, 1913 † accepted as Pseudoleacina hypermeces (Staadt, 1913) † (redescription)
Helix semiinversa Cossmann, 1913 † (original description)
Hydrobia (Parhydrobia) Cossmann & Dollfus, 1913 † accepted as Parhydrobia Cossmann & Dollfus, 1913 † (original description)
Lacuna microscopica Staadt, 1913 † accepted as Medoriopsis microscopica (Staadt, 1913) † (original description)
Lasaea (Lasaeoneaera) Cossmann, 1913 † accepted as Lasaeoneaera Cossmann, 1913 † (original description)
Megalomastoma bonneti Cossmann, 1913 † accepted as Ischurostoma bonneti (Cossmann, 1913) † (original description)
Melania (Melanoides) inquinata var. bicoronata Staadt, 1913 † accepted as Tinnyea vittata bicoronata (Staadt, 1913) † (original description)
Melania (Melanoides) inquinata var. pourcyensis Staadt, 1913 † accepted as Brotia (Tinnyea) melanioides vittata (Lamarck, 1804) † accepted as Tinnyea vittata (Lamarck, 1804) † (original description)
Microstagon deshayesi Cossmann, 1913 † (original description)
Miocardia laciniosa Staadt, 1913 † accepted as Miocardiopsis laciniosa (Staadt, 1913) † (original description)
Mitra (Pseudocancilla) Staadt, 1913 † accepted as Pseudocancilla Staadt, 1913 † (original description)
Mitra (Pseudocancilla) restifera Staadt, 1913 † accepted as Pseudocancilla restifera (Staadt, 1913) † (original description)
Physa (Aplecta) brevispirata Cossmann & Pissarro, 1913 † accepted as Aplexa cotiensis Pacaud, 2022 † (redescription)
Pseudotaphrus vitiusculensis (Pezant, 1910) † accepted as Rissoina vitiusculensis Pezant, 1910 † (new combination reference)
Rillya convoluta Staadt, 1913 † (redescription)
Roxania pezanti Cossmann, 1913 † (original description)
Spirialis pygmaea (Lamarck, 1804) † accepted as Limacina pygmaea (Lamarck, 1804) † (basis of record)
Spirialis pygmaea var. pezanti Cossmann, 1913 † accepted as Limacina pygmaea (Lamarck, 1804) † (original description)
Suessionia altera Cossmann, 1913 † accepted as Eocantharus alter (Cossmann, 1913) † (original description)
Triforis pezanti Cossmann, 1913 † accepted as Triphora pezanti Cossmann, 1913 † (original description)
Triphora pezanti Cossmann, 1913 † (original description)
Turricula plateaui Staadt, 1913 † accepted as Fusimitra plateaui (Staadt, 1913) † (original description)
Uxia gailleti Cossmann, 1913 † accepted as Unitas gailleti (Cossmann, 1913) † (original description)

France for Acmaea catalaunensis Cossmann, 1913 † 
France for Allixia acicularis Cossmann, 1913 † 
France for Allixia acicularis Cossmann, 1913 † 
France for Allixia acicularis Cossmann, 1913 † 
France for Allixia acicularis Cossmann, 1913 † 
France for Capulus larochei Cossmann, 1913 † 
France for Carychium cylindroides Staadt, 1913 † 
France for Carychium nincki Cossmann, 1913 † 
France for Carychium sparnacense var. polysarcum Cossmann, 1913 † 
France for Corbula moloti Cossmann, 1913 † 
France for Cylindrellina sparnacensis Cossmann, 1913 † 
France for Delphinula reynieri Cossmann, 1913 † 
France for Discors mirabilis Staadt, 1913 † 
France for Fissurella fenauxi Cossmann, 1913 † 
France for Helix semiinversa Cossmann, 1913 † 
France for Lacuna microscopica Staadt, 1913 † 
France for Megalomastoma bonneti Cossmann, 1913 † 
France for Melania (Melanoides) inquinata var. bicoronata Staadt, 1913 † 
France for Melania (Melanoides) inquinata var. pourcyensis Staadt, 1913 † 
France for Microstagon deshayesi Cossmann, 1913 † 
France for Miocardia laciniosa Staadt, 1913 † 
France for Mitra restifera Cossmann, 1913 † 
France for Physa (Aplecta) brevispirata Cossmann & Pissarro, 1913 † 
France for Rillya convoluta Staadt, 1913 † 
France for Roxania pezanti Cossmann, 1913 † 
France for Spirialis pygmaea var. pezanti Cossmann, 1913 † 
France for Suessionia altera Cossmann, 1913 † 
France for Triforis pezanti Cossmann, 1913 † 
France for Turricula plateaui Staadt, 1913 † 
France for Uxia gailleti Cossmann, 1913 † 

 Authority

 for Bouryia nincki (Cossmann, 1913) †

Also described in Cossmann (1913: 148), precendence not established. [details]

 Type locality

 for Allixia acicularis Cossmann, 1913 †

Berchères-sur-Vesgre ("Berchères"), Eure-et-Loir, and Beynes (Ferme de l'Orme), Septeuil and Thiverval-Grignon, ... [details]

 Type locality

 for Carychium sparnacense var. polysarcum Cossmann, 1913 †

Grauves, Marne, France; Cuisian, late Ypresian, early Eocene [details]

 Type locality

 for Cylindrellina sparnacensis Cossmann, 1913 †

Grauves, Marne, France; Cuisian, late Ypresian, early Eocene [details]

 Type locality

 for Glandina hypermeces Staadt, 1913 †

Chenay, Marne, France; Sables de Bracheux, late Thanetian, late Paleocene [details]

 Type locality

 for Helix semiinversa Cossmann, 1913 †

Grauves, Marne, France; Cuisian, late Ypresian, early Eocene [details]

 Type locality

 for Megalomastoma bonneti Cossmann, 1913 †

Grauves, Marne, France; Cuisian, late Ypresian, early Eocene [details]

 Type locality

 for Melania (Melanoides) inquinata var. bicoronata Staadt, 1913 †

Pourcy, Marne, France; Ypresian (PE III zone), early Eocene [details]

 Type locality

 for Melania (Melanoides) inquinata var. pourcyensis Staadt, 1913 †

Pourcy, Marne, France; Ypresian (PE III zone), early Eocene [details]