Opinions from T. Nagao 1928
- 'Acila was reranked as Nucula (Acila) and belongs to Nucula'
- 'Anomia belongs to Anomiidae'
- 'Batissa was reranked as Cyrena (Batissa) and belongs to Cyrena'
- 'Bulbifusus was reranked as Sycum (Bulbifusus) and belongs to Sycum'
- 'Cardita mandaica is recombined as Venericardia mandaica'
- 'Cardium belongs to Cardiidae'
- 'Cardium miikense belongs to Cardium'
- 'Cerithiopsis belongs to Cerithiidae'
- 'Corbula belongs to Corbulidae'
- 'Corbula (Cuneocorbula) kyushuensis belongs to Corbula (Cuneocorbula)'
- 'Corbula subtumida belongs to Corbula'
- 'Crassatella fusca is recombined as Crassatellites fuscus'
- 'Crassatellites belongs to Crassatellitidae'
- 'Cultellus belongs to Solenidae'
- 'Cultellus brevis belongs to Cultellus'
- 'Cuneocorbula was reranked as Corbula (Cuneocorbula) and belongs to Corbula'
- 'Cylichna belongs to Scaphandridae'
- 'Cylichna paupercula belongs to Cylichna'
- 'Cyrena belongs to Cyrenidae'
- 'Cyrena (Batissa) ponderosa belongs to Cyrena (Batissa)'
- 'Diplodonta belongs to Diplodontidae'
- 'Diplodonta problematica belongs to Diplodonta'
- 'Faunus belongs to Melanopsidae'
- 'Faunus nipponicus belongs to Faunus'
- 'Hemifusus belongs to Buccinidae'
- 'Lima belongs to Limidae'
- 'Lima amaxensis belongs to Lima'
- 'Lima amaxensis kumasoana belongs to Lima amaxensis'
- 'Lima eocenica belongs to Lima'
- 'Lunatia was reranked as Polinices (Lunatia) and belongs to Polinices'
- 'Macoma belongs to Tellinidae'
- 'Macrocallista belongs to Veneridae'
- 'Macrocallista ariakensis belongs to Macrocallista'
- 'Melania belongs to Melaniidae'
- 'Melania miikensis belongs to Melania'
- 'Mytilus belongs to Mytilidae'
- 'Mytilus rigaultii belongs to Mytilus' according to Deshayes 1884
- 'Mytilus rigaultii belongs to Mytilus'
- 'Nerita belongs to Neritidae'
- 'Nerita subgranulosa belongs to Nerita'
- 'Neverita was reranked as Polynices (Neverita) and belongs to Polynices'
- 'Nucula belongs to Nuculidae'
- 'Orthaulax belongs to Strombidae'
- 'Orthaulax japonicus belongs to Orthaulax' according to Nagao 1924
- 'Orthaulax japonicus belongs to Orthaulax'
- 'Pedalion belongs to Pedalionidae'
- 'Pedalion tomiyasui belongs to Pedalion'
- 'Pentacrinus belongs to Pentacrinidae'
- 'Pentacrinus ariakensis belongs to Pentacrinus'
- 'Pitaria belongs to Veneridae'
- 'Polinices is corrected as Polynices and belongs to Naticidae'
- 'Polinices (Lunatia) utoensis belongs to Polinices (Lunatia)'
- 'Polynices (Neverita) eocenica belongs to Polynices (Neverita)'
- 'Rissoina belongs to Rissoinidae'
- 'Rissoina gemma belongs to Rissoina'
- 'Siphonalia belongs to Siphonaliidae'
- 'Siphonaliinae was reranked as the family Siphonaliidae and belongs to Gastropoda'
- 'Sycum belongs to Siphonaliidae'
- 'Sycum (Bulbifusus) miikense belongs to Sycum (Bulbifusus)'
- 'Tellina belongs to Tellinidae'
- 'Trochus (Turcicula) was reranked as Turcicula and belongs to Trochidae'
- 'Turris belongs to Pleurotomidae'
- 'Turris higoensis belongs to Turris'
- 'Turritella belongs to Turritellidae'
- 'Turritella miikensis belongs to Turritella'
- 'Turritella okadai belongs to Turritella'
- 'Unio belongs to Unionidae'
- 'Venericardia belongs to Carditidae'
- 'Venericardia nipponica belongs to Venericardia'
- 'Yoldia belongs to Ledidae'