Opinions from B. L. Clark 1938
- 'Austrofusus was reranked as Siphonalia (Austrofusus) and belongs to Siphonalia'
- 'Axinaea (Limopsis) sagittata is recombined as Glycymeris sagittata'
- 'Benoistia californica belongs to Benoistia'
- 'Calicantharus was reranked as Cantharus (Calicantharus) and belongs to Cantharus'
- 'Cantharus (Calicantharus) califomicus belongs to Cantharus (Calicantharus)'
- 'Cantharus (Endopachychilus) suturalis belongs to Cantharus (Endopachychilus)'
- 'Cantharus (Eocantharus) cowlitzensis belongs to Cantharus (Eocantharus)'
- 'Corbicula arnoldi belongs to Corbicula'
- 'Corbicula oldroydi belongs to Corbicula'
- 'Crassatellites (Eucrassatella) weaveri belongs to Crassatellites (Eucrassatella)'
- 'Elimia dickersoni belongs to Elimia'
- 'Elimia schencki belongs to Elimia'
- 'Endopachychilus was reranked as Cantharus (Endopachychilus) and belongs to Cantharus'
- 'Fusinus markleyensis belongs to Fusinus'
- 'Latirus kirbyi belongs to Latirus'
- 'Lucina (Here) hannai belongs to Lucina (Here)'
- 'Mactra (Spisula) markleyensis belongs to Mactra (Spisula)'
- 'Melanoides was reranked as Thiara (Melanoides) and belongs to Thiara'
- 'Molopophorus crooki belongs to Molopophorus'
- 'Myadesma eocenica belongs to Myadesma'
- 'Nerita cooki belongs to Nerita'
- 'Neverita secta hemisecta belongs to Neverita secta'
- 'Pectunculus eocenica is recombined as Glycymeris eocenica'
- 'Perse markleyensis belongs to Perse'
- 'Perse tuberculatum belongs to Perse'
- 'Pseudoliva kirbyi belongs to Pseudoliva'
- 'Pseudoliva markleyensis belongs to Pseudoliva'
- 'Siphonalia (Austrofusus) bicarinata belongs to Siphonalia (Austrofusus)'
- 'Siphonalia (Austrofusus) bicarinata crooki belongs to Siphonalia (Austrofusus) bicarinata'
- 'Thiara (Melanoides) calafi belongs to Thiara (Melanoides)'
- 'Thiara (Melanoides) markleyensis belongs to Thiara (Melanoides)'
- 'Urosalpinx kirbyi belongs to Urosalpinx'
- 'Yoldia markleyensis belongs to Yoldia'