Ancilla hinomotoensis Yokoyama, 1922 † accepted as Amalda hinomotoensis (Yokoyama, 1922) (original description)
Anomia lunula Yokoyama, 1922 accepted as Isomonia umbonata (A. Gould, 1861) (original description)
Anomia sematana Yokoyama, 1922 accepted as Isomonia umbonata (A. Gould, 1861) (original description)
Basilissa laeviuscula Yokoyama, 1922 accepted as Heterogen japonica (E. von Martens, 1861) accepted as Cipangopaludina japonica (E. von Martens, 1861) (original description)
Bela recticostulata Yokoyama, 1922 † (original description)
Bulla multiarata Yokoyama, 1922 † accepted as Roxania punctulata (A. Adams, 1862) accepted as Mimatys punctulatus (A. Adams, 1862) (original description)
Cardium tokunagai Yokoyama, 1922 † (original description)
Cerithiopsis (Seila) trisulcata Yokoyama, 1922 † accepted as Cerithiella trisulcata (Yokoyama, 1922) (original description)
Cerithiopsis nodosocostatus Yokoyama, 1922 † (original description)
Chemnitzia kidoensis Yokoyama, 1922 accepted as Turbonilla kidoensis Yokoyama, 1922 (original description)
Columbella (Atilia) masakadoi Yokoyama, 1922 † accepted as Anachis masakadoi (Yokoyama, 1922) † (original description)
Columbella (Atilia) praecursor Yokoyama, 1922 † accepted as Anachis praecursor (Yokoyama, 1922) † (original description)
Columbella (Atilia) smithi Yokoyama, 1922 † represented as Columbella smithi Yokoyama, 1922 † accepted as Mitrella tokyoensis Kuroda & Habe, 1954 † (original description)
Columbella (Atilia) turriculata Yokoyama, 1922 † accepted as Anachis turriculata (Yokoyama, 1922) † (original description)
Conotalopia sematensis (Oyama, 1942) (additional source)
Corbicula kobelti Yokoyama, 1922 † accepted as Corbicula (Corbicula) japonica Prime, 1864 represented as Corbicula japonica Prime, 1864 (original description)
Corbicula sandaiformis Yokoyama, 1922 † accepted as Corbicula (Corbicula) japonica Prime, 1864 represented as Corbicula japonica Prime, 1864 (original description)
Corbula frequens Yokoyama, 1922 accepted as Potamocorbula amurensis (Schrenck, 1861) (original description)
Corbula pustulosa Yokoyama, 1922 accepted as Potamocorbula amurensis (Schrenck, 1861) (original description)
Corbula pygmaea Yokoyama, 1922 accepted as Varicorbula yokoyamai T. Habe, 1949 (original description)
Corbula sematensis Yokoyama, 1922 accepted as Potamocorbula amurensis (Schrenck, 1861) (original description)
Corbula substriata Yokoyama, 1922 accepted as Corbula rotalis Hinds, 1843 accepted as Varicorbula rotalis (Hinds, 1843) (original description)
Crenella divaricata Yokoyama, 1922 accepted as Crenella decussata (Montagu, 1808) (original description)
Cryptomya busoensis Yokoyama, 1922 (original description)
Cucullaria orientalis Yokoyama, 1922 accepted as Porterius dalli (E. A. Smith, 1885) (original description)
Cuspidaria ligula Yokoyama, 1922 accepted as Plectodon ligula (Yokoyama, 1922) (original description)
Cyclostrema stillicidiatum Yokoyama, 1922 † (original description)
Dentalium (Fustiaria) nipponicum Yokoyama, 1922 † accepted as Fustiaria nipponica (Yokoyama, 1922) (original description)
Drillia glabriuscula Yokoyama, 1922 † accepted as Elaeocyma glabriuscula (Yokoyama, 1922) (original description)
Emarginula vadososinuata Yokoyama, 1922 accepted as Scelidotoma vadososinuata (Yokoyama, 1922) accepted as Tugalina vadososinuata (Yokoyama, 1922) (original description)
Entodesma naviculoides Yokoyama, 1922 accepted as Entodesma navicula (A. Adams & Reeve, 1850) (original description)
Eulima (Leiostraca) glabroides Yokoyama, 1922 † accepted as Eulima glabroides Yokoyama, 1922 † (original description)
Eulima (Leiostraca) krishna Yokoyama, 1922 † accepted as Eulima krishna Yokoyama, 1922 † (original description)
Eulima (Leiostraca) tokunagai Yokoyama, 1922 † (original description)
Eulima (Leiostraca) unicincta Yokoyama, 1922 † accepted as Eulima unicincta Yokoyama, 1922 (original description)
Eulima ozawai Yokoyama, 1922 accepted as Eulima bifascialis (A. Adams, 1863) (original description)
Genotia ogurana Yokoyama, 1922 accepted as Ophiodermella ogurana (Yokoyama, 1922) (original description)
Genotia pseudopannus Yokoyama, 1922 † accepted as Ophiodermella pseudopannus (Yokoyama, 1922) (original description)
Jouannetia kamakurensis Yokoyama, 1922 accepted as Penitella gabbii (Tryon, 1863) (original description)
Leptothyra crassilirata Yokoyama, 1922 † (original description)
Leptothyra pygmaea Yokoyama, 1922 accepted as Lirularia pygmaea (Yokoyama, 1922) (original description)
Lima vulgatula Yokoyama, 1922 † (original description)
Limopsis areolata Yokoyama, 1922 accepted as Empleconia cumingi (A. Adams, 1863) (original description)
Limopsis nipponica Yokoyama, 1922 accepted as Nipponolimopsis nipponica (Yokoyama, 1922) (original description)
Macrochisma sinensis var. brevis Yokoyama, 1922 † (original description)
Mactra dunkeri Yokoyama, 1922 accepted as Spisula sachalinensis (Schrenck, 1861) accepted as Spisula sibyllae (Valenciennes, 1858) (original description)
Mactra sachalinensis var. imperialis Yokoyama, 1922 accepted as Spisula sachalinensis (Schrenck, 1861) accepted as Spisula sibyllae (Valenciennes, 1858) (original description)
Mangilia (Cythara) oyuana Yokoyama, 1922 † accepted as Ithycythara oyuana (Yokoyama, 1922) (original description)
Mangilia (Cythara) rugosolabiata Yokoyama, 1922 † accepted as Leiocithara longispira (E. A. Smith, 1879) (original description)
Mangilia fukuchiana Yokoyama, 1922 † accepted as Haedropleura fukuchiana (Yokoyama, 1922) (original description)
Marginella cotamago Yokoyama, 1922 accepted as Granulina cotamago (Yokoyama, 1922) (original description)
Marginella perovulum Yokoyama, 1922 † accepted as Hyalina perovula (Yokoyama, 1922) † (original description)
Mitra hondana Yokoyama, 1922 accepted as Microvoluta hondana (Yokoyama, 1922) (original description)
Mitra pirula Yokoyama, 1922 accepted as Microvoluta hondana (Yokoyama, 1922) (original description)
Montacuta japonica Yokoyama, 1922 accepted as Montacutona japonica (Yokoyama, 1922) (original description)
Montacuta oblongata Yokoyama, 1922 accepted as Nipponomysella oblongata (Yokoyama, 1922) (original description)
Montacuta yamakawai Yokoyama, 1922 accepted as Borniopsis yamakawai (Yokoyama, 1922) (original description)
Ocinebra spectata Yokoyama, 1922 † accepted as Ocenebra spectata Yokoyama, 1922 † (original description)
Odostomia (Egilina) marielloides Yokoyama, 1922 accepted as Parthenina marielloides (Yokoyama, 1922) (original description)
Odostomia (Odetta) neofelix Yokoyama, 1922 accepted as Iolaea neofelix (Yokoyama, 1922) (original description)
Odostomia (Odostomia) gordonis Yokoyama, 1922 accepted as Megastomia gordonis (Yokoyama, 1922) (original description)
Odostomia (Odostomia) kizakiensis Yokoyama, 1922 † accepted as Odostomia kizakiensis Yokoyama, 1922 † (original description)
Odostomia (Odostomia) shimosensis Yokoyama, 1922 † accepted as Odostomia shimosensis Yokoyama, 1922 (original description)
Odostomia (Odostomia) suboxia Yokoyama, 1922 accepted as Odostomia suboxia Yokoyama, 1922 (original description)
Odostomia (Odostomia) toneana Yokoyama, 1922 † accepted as Odostomia toneana Yokoyama, 1922 † (original description)
Odostomia (Odostomia) venusta Yokoyama, 1922 † accepted as Odostomia venusta Yokoyama, 1922 † (original description)
Odostomia shimosensis Yokoyama, 1922 (original description)
Olivella spretoides Yokoyama, 1922 (original description)
Parviterebra raritans Yokoyama, 1922 † (original description)
Pecten tenuicostulatus Yokoyama, 1922 † accepted as Parvamussium intuscostatum (Yokoyama, 1920) (original description)
Pectunculus yamakawai Yokoyama, 1922 accepted as Glycymeris rotunda (Dunker, 1882) (original description)
Philine pygmaea Yokoyama, 1922 † accepted as Yokoyamaia (Choshiphiline) pygmaea (Yokoyama, 1922) † (original description)
Philine takatensis Yokoyama, 1922 † (original description)
Poromya flexuosa Yokoyama, 1922 (original description)
Psammobia kazusensis Yokoyama, 1922 accepted as Gari kazusensis (Yokoyama, 1922) (original description)
Psammocola kazusensis Yokoyama, 1922 accepted as Gari kazusensis (Yokoyama, 1922) (original description)
Pyramidella (Agatha) virgo var. brevis Yokoyama, 1922 † accepted as Agatha brevis (Yokoyama, 1922) (original description)
Pyramidella (Iphiana) mira Yokoyama, 1922 accepted as Iphiana mira (Yokoyama, 1922) (original description)
Pyramidella (Iphiana) siva Yokoyama, 1922 † accepted as Iphiana siva (Yokoyama, 1922) † (original description)
Raeta elliptica Yokoyama, 1922 accepted as Raeta pulchella (A. Adams & Reeve, 1850) (original description)
Raeta magnifica Yokoyama, 1922 accepted as Raeta pellicula (Reeve, 1854) (original description)
Rissoa (Cingula) plebeja Yokoyama, 1922 † accepted as Rissoa plebeja Yokoyama, 1922 † (original description)
Rissoa plebeja Yokoyama, 1922 † (original description)
Rissoina (Moerchiella) manzakiana Yokoyama, 1922 † accepted as Rugadentia manzakiana (Yokoyama, 1922) (original description)
Rissoina manzakiana Yokoyama, 1922 † accepted as Moerchiella manzakiana (Yokoyama, 1922) † (original description)
Scalaria azumana Yokoyama, 1922 accepted as Epitonium eximium (A. Adams & Reeve, 1850) (original description)
Scalaria conjuncta Yokoyama, 1922 accepted as Epitonium conjunctum (Yokoyama, 1922) (original description)
Scalaria kazusensis Yokoyama, 1922 accepted as Epitonium kazusense (Yokoyama, 1922) (original description)
Scalaria maculosa Yokoyama, 1922 accepted as Epitonium stigmaticum (Pilsbry, 1911) (original description)
Scalaria picturata Yokoyama, 1922 † accepted as Amaea thielei (de Boury, 1913) (original description)
Scalaria subfrondicula Yokoyama, 1922 † accepted as Epitonium subfrondiculum (Yokoyama, 1922) (original description)
Scalaria yamakawai Yokoyama, 1922 accepted as Epitonium yamakawai (Yokoyama, 1922) (original description)
Sipho (Parasipho) nipponicus Yokoyama, 1922 † accepted as Oenopota nipponica (Yokoyama, 1922) † (original description)
Skenea planorboides Yokoyama, 1922 † (original description)
Solidula clathrata Yokoyama, 1922 † accepted as Pupa clathrata (Yokoyama, 1922) † (original description)
Tellina alternata var. chibana Yokoyama, 1922 accepted as Megangulus venulosus (Schrenck, 1861) (original description)
Tellina delta Yokoyama, 1922 accepted as Cadella delta (Yokoyama, 1922) (original description)
Terebra chibana Yokoyama, 1922 † accepted as Terebra pustulosa E. A. Smith, 1879 accepted as Pristiterebra pustulosa (E. A. Smith, 1879) (original description)
Terebra latisulcata Yokoyama, 1922 † accepted as Duplicaria latisulcata (Yokoyama, 1922) (original description)
Terebra quadriarata Yokoyama, 1922 † accepted as Cinguloterebra quadriarata (Yokoyama, 1922) (original description)

Honshu for Basilissa laeviuscula Yokoyama, 1922 
Honshu for Columbella (Atilia) smithi Yokoyama, 1922 † 
Honshu for Corbicula kobelti Yokoyama, 1922 † 
Honshu for Corbicula sandaiformis Yokoyama, 1922 † 
Honshu for Marginella cotamago Yokoyama, 1922 
Japan for Terebra latisulcata Yokoyama, 1922 † 
Japan for Terebra quadriarata Yokoyama, 1922 † 

 Type locality

 for Corbicula kobelti Yokoyama, 1922 †

"Shito, Otake" (Honshu, Japan) [details]

 Type locality

 for Corbicula sandaiformis Yokoyama, 1922 †

"Otake, Kamenari, Shito" (Honshu, Japan) [details]