Opinions from T. A. Conrad 1855
- 'Arca microdonta belongs to Arca'
- 'Bulla jugularis belongs to Bulla'
- 'Busycon blakei belongs to Busycon'
- 'Cardium linteum belongs to Cardium'
- 'Cardium modestum belongs to Cardium'
- 'Clavatula californica belongs to Clavatula'
- 'Colus arctatus belongs to Colus'
- 'Corbula diegoana belongs to Corbula'
- 'Crassatella alta belongs to Crassatella'
- 'Crassatella uvasana belongs to Crassatella'
- 'Crucibulum spinosum belongs to Crucibulum'
- 'Dosinia alta belongs to Dosinia'
- 'Fissurella crenulata belongs to Fissurella'
- 'Gratelupia mactropsis belongs to Gratelupia'
- 'Littorina pedroana belongs to Littorina'
- 'Lutraria (Cryptodon) nuttallii is recombined as Schizothaerus nuttalli'
- 'Mactra diegoana belongs to Mactra'
- 'Meretrix californiana belongs to Meretrix'
- 'Meretrix decisa belongs to Meretrix'
- 'Meretrix tularana belongs to Meretrix'
- 'Meretrix uniomeris belongs to Meretrix'
- 'Meretrix uvasana belongs to Meretrix'
- 'Modiola contracta belongs to Modiola'
- 'Mytilus humerus belongs to Mytilus'
- 'Mytilus pedroanus belongs to Mytilus'
- 'Narica diegoana belongs to Narica'
- 'Nassa intastriata belongs to Nassa'
- 'Nassa pedroana belongs to Nassa'
- 'Natica alveata belongs to Natica'
- 'Natica geniculata belongs to Natica'
- 'Natica ocoyana belongs to Natica'
- 'Nucula decisa belongs to Nucula'
- 'Pecten catilliformis belongs to Pecten'
- 'Pecten deserti belongs to Pecten'
- 'Penitella speloeum belongs to Penitella'
- 'Petricola pedroana belongs to Petricola'
- 'Pleurotoma ocoyana belongs to Pleurotoma'
- 'Pleurotoma transmontana belongs to Pleurotoma'
- 'Saxicava abrupta belongs to Saxicava'
- 'Strephona pedroana is recombined as Oliva pedroensis'
- 'Sycotypus ocoyanus belongs to Sycotypus'
- 'Tellina congesta belongs to Tellina'
- 'Tellina dariena belongs to Tellina'
- 'Tellina diegoana belongs to Tellina'
- 'Tellina pedroana belongs to Tellina'
- 'Trochita diegoana belongs to Trochita'
- 'Turritella ocoyana belongs to Turritella'
- 'Turritella uvasana belongs to Turritella'
- 'Volutilithes [misspelled as Volutatithes] belongs to Volutidae'
- 'Volutilithes californiana [misspelled as Volutatithes californiana] belongs to Volutatithes'