Opinions from W. M. Gabb 1864
- 'Acrosmilia was reranked as Trochosmilia (Acrosmilia) and belongs to Trochosmilia'
- 'Actaeon impressus belongs to Actaeon'
- 'Acteonina californica belongs to Acteonina'
- 'Acteonina pupoides belongs to Acteonina'
- 'Amauropsis oviformis belongs to Amauropsis'
- 'Ammonites batesii belongs to Ammonites'
- 'Ammonites brewerii belongs to Ammonites'
- 'Ammonites chicoensis belongs to Ammonites'
- 'Ammonites cooperii belongs to Ammonites'
- 'Ammonites haydenii belongs to Ammonites'
- 'Ammonites hoffmannii belongs to Ammonites'
- 'Ammonites newberryanus belongs to Ammonites'
- 'Ammonites ramosus belongs to Ammonites' according to Meek 1864
- 'Ammonites ramosus belongs to Ammonites'
- 'Ammonites remondii belongs to Ammonites'
- 'Ammonites subtricarinatus belongs to Ammonites'
- 'Ammonites traskii belongs to Ammonites'
- 'Anatina inequilateralis belongs to Anatina'
- 'Anatina lata belongs to Anatina'
- 'Anatina tryoniana belongs to Anatina'
- 'Ancillaria elongata belongs to Ancillaria'
- 'Angaria ornatissima belongs to Angaria'
- 'Anisomyon meekii belongs to Anisomyon'
- 'Anomia lineata belongs to Anomia'
- 'Anthonya cultriformis belongs to Anthonya'
- 'Aporrhais angulata belongs to Aporrhais'
- 'Aporrhais californica belongs to Aporrhais'
- 'Aporrhais exilis belongs to Aporrhais'
- 'Aporrhais falciformis belongs to Aporrhais'
- 'Arca breweriana belongs to Arca'
- 'Arca decurtata belongs to Arca'
- 'Arca gravida belongs to Arca'
- 'Arca hornii belongs to Arca'
- 'Architectonica cognata belongs to Architectonica'
- 'Architectonica hornii belongs to Architectonica'
- 'Architectonica inornata belongs to Architectonica'
- 'Architectonica veatchii belongs to Architectonica'
- 'Asaphis undulata belongs to Asaphis'
- 'Astarte conradiana belongs to Astarte'
- 'Astarte mathewsonii belongs to Astarte'
- 'Astarte tuscana belongs to Astarte'
- 'Astrocoenia petrosa belongs to Astrocoenia'
- 'Aturia mathewsonii belongs to Aturia'
- 'Avicula pellucida belongs to Avicula'
- 'Axinaea (Limopsis) sagittata belongs to Axinaea (Limopsis)'
- 'Axinaea cor belongs to Axinaea'
- 'Axinaea veatchii belongs to Axinaea'
- 'Baculites chicoensis belongs to Baculites'
- 'Belemnites impressus belongs to Belemnites'
- 'Buccinum liratum belongs to Buccinum'
- 'Bulla hornii belongs to Bulla'
- 'Busycon blakei is recombined as Perissolax blakei'
- 'Callianassa stimpsoni belongs to Callianassa'
- 'Cardita hornii belongs to Cardita'
- 'Cardita veneriformis belongs to Cardita'
- 'Cardium (Laevicardium) annulatum belongs to Cardium (Laevicardium)'
- 'Cardium (Protocardium) placerensis belongs to Cardium (Protocardium)'
- 'Cardium brewerii belongs to Cardium'
- 'Cardium cooperii belongs to Cardium'
- 'Cardium remondianum belongs to Cardium'
- 'Cerithiopsis alternata belongs to Cerithiopsis'
- 'Chemnitzia spillmani belongs to Chemnitzia' according to Conrad 1860
- 'Chemnitzia spillmani belongs to Chemnitzia'
- 'Chione angulata belongs to Chione'
- 'Cinulia mathewsonii belongs to Cinulia'
- 'Cinulia obliqua belongs to Cinulia'
- 'Cinulia pinguis belongs to Cinulia'
- 'Clavatula californica is recombined as Fusus californicus'
- 'Conus hornii belongs to Conus'
- 'Corbula cultriformis belongs to Corbula'
- 'Corbula hornii belongs to Corbula'
- 'Corbula parilis belongs to Corbula'
- 'Corbula primorsa belongs to Corbula'
- 'Corbula traskii belongs to Corbula'
- 'Cordiera microptygma belongs to Cordiera'
- 'Crassatella uvasana belongs to Crassatella'
- 'Crassatellites grandis is recombined as Crassatella grandis'
- 'Crenella cocentrica belongs to Crenella'
- 'Crioceras (Ancyloceras) remondi is recombined as Crioceras remondi'
- 'Crioceras latus belongs to Crioceras'
- 'Crioceras percostatus belongs to Crioceras'
- 'Crypta (Spirocrypta) pileum is recombined as Crypta pileum'
- 'Cucullaea mathewsonii belongs to Cucullaea'
- 'Cucullaea truncata belongs to Cucullaea'
- 'Cylichna costata belongs to Cylichna'
- 'Cylindrites brevis belongs to Cylindrites'
- 'Cypraea bayerquei belongs to Cypraea'
- 'Cyprinella tenuis belongs to Cyprinella'
- 'Dentalium cooperii is corrected as Dentalium cooperi and belongs to Dentalium'
- 'Dentalium pusillum belongs to Dentalium'
- 'Dentalium stramineum belongs to Dentalium'
- 'Discohelix leana belongs to Discohelix'
- 'Dosinia elevata belongs to Dosinia'
- 'Dosinia gyrata belongs to Dosinia'
- 'Dosinia inflata belongs to Dosinia'
- 'Dosinia pertenuis belongs to Dosinia'
- 'Drillia was reranked as Turris (Drillia) and belongs to Turris'
- 'Ellipsosmilia was reranked as Trochosmilia (Ellipsosmilia) and belongs to Trochosmilia'
- 'Emarginula radiata belongs to Emarginula'
- 'Eriphyla umbonata belongs to Eriphyla'
- 'Exogyra parasitica belongs to Exogyra'
- 'Fasciolaria io belongs to Fasciolaria'
- 'Fasciolaria laeviuscula belongs to Fasciolaria'
- 'Fasciolaria sinuata belongs to Fasciolaria'
- 'Ficus cypraeoides belongs to Ficus'
- 'Ficus mamillatus belongs to Ficus'
- 'Flabellum remondianum belongs to Flabellum'
- 'Fusus (Hemifusus) cooperii belongs to Fusus (Hemifusus)'
- 'Fusus (Hemifusus) hornii belongs to Fusus (Hemifusus)'
- 'Fusus (Hemifusus) remondii belongs to Fusus (Hemifusus)'
- 'Fusus aratus belongs to Fusus'
- 'Fusus averillii belongs to Fusus'
- 'Fusus diaboli belongs to Fusus'
- 'Fusus kingii belongs to Fusus'
- 'Fusus martinez belongs to Fusus'
- 'Fusus mathewsonii belongs to Fusus'
- 'Galerus excentricus belongs to Galerus'
- 'Gari texta belongs to Gari'
- 'Globiconcha remondii belongs to Globiconcha'
- 'Gyrodes was reranked as Lunatia (Gyrodes) and belongs to Lunatia'
- 'Gyrodes expansa belongs to Gyrodes'
- 'Hamites vancouverensis belongs to Hamites'
- 'Haydenia impressa belongs to Haydenia'
- 'Helcion circularis belongs to Helcion'
- 'Helcion dichotoma belongs to Helcion'
- 'Helicoceras brewerii belongs to Helicoceras'
- 'Helicoceras declive belongs to Helicoceras'
- 'Helicoceras vermicularis belongs to Helicoceras'
- 'Hemifusus was reranked as Fusus (Hemifusus) and belongs to Fusus'
- 'Inoceramus piochii belongs to Inoceramus'
- 'Laevicardium was reranked as Cardium (Laevicardium) and belongs to Cardium'
- 'Leda protexta belongs to Leda' according to Gabb 1860
- 'Leda protexta belongs to Leda'
- 'Leda translucida belongs to Leda'
- 'Lima appressa belongs to Lima'
- 'Lima microtis belongs to Lima'
- 'Limopsis transversa belongs to Limopsis'
- 'Lithophagus oviformis belongs to Lithophagus'
- 'Littorina compacta belongs to Littorina'
- 'Loripes dubia belongs to Loripes'
- 'Lucina cretacea belongs to Lucina'
- 'Lucina cumulata belongs to Lucina'
- 'Lucina nasuta belongs to Lucina'
- 'Lucina postradiata belongs to Lucina'
- 'Lucina subcircularis belongs to Lucina'
- 'Lunatia (Gyrodes) conradiana belongs to Lunatia (Gyrodes)'
- 'Lunatia avellana belongs to Lunatia'
- 'Lunatia hornii belongs to Lunatia'
- 'Lunatia nuciformis belongs to Lunatia'
- 'Lunatia shumardiana belongs to Lunatia'
- 'Lutraria truncata belongs to Lutraria'
- 'Lysis duplicosta belongs to Lysis'
- 'Mactra ashburnerii belongs to Mactra'
- 'Margaritella crenulata belongs to Margaritella'
- 'Margaritella globosa belongs to Margaritella'
- 'Martesia clausa belongs to Martesia'
- 'Meekia navis belongs to Meekia'
- 'Meekia radiata belongs to Meekia'
- 'Meekia sella belongs to Meekia'
- 'Megistostoma striata belongs to Megistostoma'
- 'Meretrix arata belongs to Meretrix'
- 'Meretrix californiana [misspelled as Meretrix californica] belongs to Meretrix'
- 'Meretrix hornii belongs to Meretrix'
- 'Meretrix lens belongs to Meretrix'
- 'Meretrix longa belongs to Meretrix'
- 'Meretrix nitida belongs to Meretrix'
- 'Meretrix ovalis belongs to Meretrix'
- 'Meretrix uvasana belongs to Meretrix'
- 'Mitra cretacea belongs to Mitra'
- 'Modiola cylindrica belongs to Modiola'
- 'Modiola ornata belongs to Modiola'
- 'Modiola siskiyouensis belongs to Modiola'
- 'Morio (Sconsia) tuberculatus belongs to Morio (Sconsia)'
- 'Mysia polita belongs to Mysia'
- 'Mytilus ascia belongs to Mytilus'
- 'Mytilus pauperculus belongs to Mytilus'
- 'Nassa antiquata belongs to Nassa'
- 'Nassa cretacea belongs to Nassa'
- 'Natica alveata is recombined as Amauropsis alveata'
- 'Natica uvasana belongs to Natica'
- 'Naticina obliqua belongs to Naticina'
- 'Nautilus texanus belongs to Nautilus' according to Shumard 1860
- 'Nautilus texanus belongs to Nautilus'
- 'Neaera dolabraeformis belongs to Neaera'
- 'Neptunea curvirostris belongs to Neptunea'
- 'Neptunea gracilis belongs to Neptunea'
- 'Neptunea hoffmannii belongs to Neptunea'
- 'Neptunea perforata belongs to Neptunea'
- 'Neptunea ponderosa belongs to Neptunea'
- 'Neptunea supraplicata belongs to Neptunea'
- 'Nerinea dispar belongs to Nerinea'
- 'Nerita cuneata belongs to Nerita'
- 'Nerita deformis belongs to Nerita'
- 'Neverita secta belongs to Neverita'
- 'Niso polita belongs to Niso'
- 'Nucula truncata belongs to Nucula'
- 'Olivella mathewsonii belongs to Olivella'
- 'Opalia was reranked as Scalaria (Opalia) and belongs to Scalaria'
- 'Ostrea brewerii belongs to Ostrea'
- 'Ostrea malleiformis belongs to Ostrea'
- 'Panopaea concentrica belongs to Panopaea'
- 'Patella traskii belongs to Patella'
- 'Pecten californicus belongs to Pecten'
- 'Pecten operculiformis belongs to Pecten'
- 'Pecten traskii belongs to Pecten'
- 'Perissolax brevirostris belongs to Perissolax'
- 'Pharella alta belongs to Pharella'
- 'Pholadomya brewerii belongs to Pholadomya'
- 'Pholadomya nasuta belongs to Pholadomya'
- 'Pinna brewerii belongs to Pinna'
- 'Placunanomia inornata belongs to Placunanomia'
- 'Plicatula variata belongs to Plicatula'
- 'Potamides diadema belongs to Potamides'
- 'Potamides tenuis belongs to Potamides'
- 'Protocardium was reranked as Cardium (Protocardium) and belongs to Cardium'
- 'Pseudoliva lineata belongs to Pseudoliva'
- 'Pseudoliva volutaeformis belongs to Pseudoliva'
- 'Ptychoceras aequicostatus belongs to Ptychoceras'
- 'Ptychoceras quadratus belongs to Ptychoceras'
- 'Pugnellus hamulus belongs to Pugnellus'
- 'Pugnellus manubriatus belongs to Pugnellus'
- 'Rimella was reranked as Rostellaria (Rimella) and belongs to Rostellaria'
- 'Ringicula varia belongs to Ringicula'
- 'Rostellaria (Rimella) canalifera belongs to Rostellaria (Rimella)'
- 'Rostellaria (Rimella) simplex belongs to Rostellaria (Rimella)'
- 'Sanguinolaria was reranked as Tellina (Sanguinolaria) and belongs to Tellina'
- 'Scalaria (Opalia) mathewsonii belongs to Scalaria (Opalia)'
- 'Sconsia was reranked as Morio (Sconsia) and belongs to Morio'
- 'Septifer dichotomus belongs to Septifer'
- 'Siliqua oregonensis belongs to Siliqua'
- 'Solen (Solena) diegoensis belongs to Solen (Solena)'
- 'Solen parallelus belongs to Solen'
- 'Solena was reranked as Solen (Solena) and belongs to Solen'
- 'Straparollus lens belongs to Straparollus'
- 'Straparollus paucivolvus belongs to Straparollus'
- 'Tapes conradiana belongs to Tapes'
- 'Tapes cretacea belongs to Tapes'
- 'Tapes quadrata belongs to Tapes'
- 'Tellina (Sanguinolaria) whitneyi belongs to Tellina (Sanguinolaria)'
- 'Tellina ashburnerii belongs to Tellina'
- 'Tellina californica belongs to Tellina'
- 'Tellina decurtata belongs to Tellina'
- 'Tellina hoffmanniana belongs to Tellina'
- 'Tellina hornii belongs to Tellina'
- 'Tellina longa belongs to Tellina'
- 'Tellina mathewsonii belongs to Tellina'
- 'Tellina monilifera belongs to Tellina'
- 'Tellina ooides belongs to Tellina'
- 'Tellina parilis belongs to Tellina'
- 'Tellina quadrata belongs to Tellina'
- 'Tellina remondii belongs to Tellina'
- 'Terebratella obesa belongs to Terebratella'
- 'Trapezium carinatum belongs to Trapezium'
- 'Trigonia evansana [misspelled as Trigonia evansii] belongs to Trigonia'
- 'Trigonia gibboniana belongs to Trigonia' according to Lea 1840
- 'Tritonium diegoensis belongs to Tritonium'
- 'Tritonium hornii belongs to Tritonium'
- 'Tritonium paucivaricatum belongs to Tritonium'
- 'Tritonium whitneyi belongs to Tritonium'
- 'Trochosmilia (Acrosmilia) striata belongs to Trochosmilia (Acrosmilia)'
- 'Trochosmilia (Ellipsosmilia) granulifera belongs to Trochosmilia (Ellipsosmilia)'
- 'Turnus plenus belongs to Turnus'
- 'Turris (Drillia) varicostata belongs to Turris (Drillia)'
- 'Turris claytonensis belongs to Turris'
- 'Turritella infralineata belongs to Turritella'
- 'Turritella robusta belongs to Turritella'
- 'Turritella saffordii belongs to Turritella'
- 'Turritella seriatimgranulata belongs to Turritella'
- 'Turritella uvasana belongs to Turritella'
- 'Turritella veatchii belongs to Turritella'
- 'Typhis antiquus belongs to Typhis'
- 'Unio penultimus belongs to Unio'
- 'Venus (Mercenaria) varians belongs to Venus (Mercenaria)'
- 'Venus lenticularis belongs to Venus'
- 'Venus tetrahedra belongs to Venus'
- 'Venus veatchii belongs to Venus'
- 'Volutilithes conradi belongs to Volutilithes' according to Gabb 1860
- 'Volutilithes conradi is recombined as Volutomorpha conradi'
- 'Volutilithes navarroensis belongs to Volutilithes'
- 'Whitneya ficus belongs to Whitneya'
- 'Yoldia nasuta belongs to Yoldia'