Opinions from W. P. Popenoe 1937
- 'Acesta was reranked as Lima (Acesta) and belongs to Lima'
- 'Ampullina packardi belongs to Ampullina'
- 'Astarte belongs to Astartidae'
- 'Astarte lapidis is recombined as Eriphyla lapidis'
- 'Astarte ovoides is recombined as Eriphyla ovoides'
- 'Astarte sulcata belongs to Astarte'
- 'Brachidontes belongs to Mytilidae'
- 'Brachidontes bifurcatus belongs to Brachidontes'
- 'Calva belongs to Veneridae'
- 'Calva regina belongs to Calva'
- 'Cardiidae belongs to Cardiacea'
- 'Cardium coronaensis is recombined as Pachycardium coronaensis'
- 'Clisocolus corrugatus belongs to Clisocolus'
- 'Crassatella gamma belongs to Crassatella'
- 'Crassatella lomana belongs to Crassatella' according to Packard 1916
- 'Crassatella lomana is recombined as Crassatella (Pachythaerus) lomana'
- 'Cucullaea bowersiana is recombined as Calva bowersiana'
- 'Cymbophora belongs to Mactridae'
- 'Cyprimeria belongs to Veneridae'
- 'Cyprimeria moorei belongs to Cyprimeria'
- 'Dosinia inflata belongs to Dosinia' according to Stewart 1930
- 'Dosinia inflata is recombined as Tenea inflata'
- 'Etea belongs to Pleurophoridae'
- 'Euspira belongs to Naticidae'
- 'Flaventia zeta belongs to Flaventia'
- 'Gyrodes californica is a subjective synonym of Euspira shumardiana'
- 'Gyrodes compressus is a subjective synonym of Euspira shumardiana'
- 'Homomya hardingensis is recombined as Liopistha (Psilomya) hardingensis'
- 'Inoperna belongs to Mytilidae'
- 'Inoperna bellarugosa belongs to Inoperna'
- 'Isocardia belongs to Isocardiidae'
- 'Isocardia delta belongs to Isocardia'
- 'Isocardiidae belongs to Isocardiacea'
- 'Lima belongs to Limidae'
- 'Lima (Acesta) beta belongs to Lima (Acesta)'
- 'Lima suciensis is recombined as Lima (Limatula) suciensis'
- 'Limatula was reranked as Lima (Limatula) and belongs to Lima'
- 'Limopsidae belongs to Prionodesmacea'
- 'Lunatia shumardiana is recombined as Euspira shumardiana'
- 'Mactra ashburnerii belongs to Mactra' according to Arnold 1909
- 'Mactra ashburnerii is recombined as Cymbophora ashburnerii' according to Whiteaves 1903
- 'Mactra ashburnerii is recombined as Cymbophora ashburnerii'
- 'Mactra gabbiana belongs to Mactra' according to Stewart 1930
- 'Mactra gabbiana is recombined as Cymbophora gabbiana'
- 'Mactridae belongs to Mactracea'
- 'Meretrix angulata is recombined as Etea angulata'
- 'Meretrix arata is recombined as Aphrodina arata'
- 'Meretrix lens belongs to Meretrix' according to Whiteaves 1879
- 'Meretrix lens is recombined as Flaventia lens'
- 'Meretrix nitida is recombined as Calva nitida'
- 'Naticidae belongs to Taenioglossa'
- 'Pachycardium belongs to Cardiidae'
- 'Pachythaerus was reranked as Crassatella (Pachythaerus) and belongs to Crassatella'
- 'Pholadomya anaana is recombined as Liopistha anaana' according to Packard 1916
- 'Pholadomya anaana is recombined as Liopistha anaana'
- 'Pleurophoridae belongs to Teleodesmacea'
- 'Prionodesmacea belongs to Pelecypoda'
- 'Psilomya was reranked as Liopistha (Psilomya) and belongs to Liopistha'
- 'Streptoneura belongs to Gastropoda'
- 'Taenioglossa was reranked as a order and belongs to Streptoneura'
- 'Tellina ooides belongs to Tellina' according to Arnold 1909
- 'Tellina ooides is recombined as Legumen ooides'
- 'Trinacria belongs to Limopsidae'
- 'Trinacria cor belongs to Trinacria'
- 'Turritella belongs to Turritellidae'
- 'Turritella iota belongs to Turritella'
- 'Turritella ossa belongs to Turritella'
- 'Turritella pescaderoensis belongs to Turritella' according to Packard 1916
- 'Turritella pescaderoensis is a subjective synonym of Turritella chicoensis'
- 'Veneridae belongs to Veneracea'
- 'Venus (Mercenaria) varians is recombined as Calva varians'