Opinions from R. B. Stewart 1927
- 'Acmaea belongs to Acmaeidae'
- 'Acmaea rudis belongs to Acmaea'
- 'Acmaea tejonensis belongs to Acmaea'
- 'Actaeon impressus is recombined as Tornatellaea impressus'
- 'Actaeonella oviformis belongs to Actaeonella'
- 'Acteonina calafia belongs to Acteonina'
- 'Acteonina californica belongs to Acteonina'
- 'Acteonina pupoides is replaced by Acteonina calafia'
- 'Agasoma (Trophosycon) kernianum is a subjective synonym of Ficus (Trophosycon) oregonensis'
- 'Agasoma gravidum multinodosum is an invalid subgroup of Bruclarkia gravida'
- 'Agasoma stanfordensis is a subjective synonym of Ficus (Trophosycon) oregonensis'
- 'Amaurellina (Euspirocrommium) clarki belongs to Amaurellina (Euspirocrommium)'
- 'Amaurellina moragai belongs to Amaurellina'
- 'Amauropsis oviformis is recombined as Ampullina oviformis'
- 'Ampullina striata is recombined as Lacunaria striata'
- 'Anchura carinifera belongs to Anchura'
- 'Anchura transversa is recombined as Drepanochilus transversus'
- 'Angaria ornatissima is recombined as Margarites (Atira) ornatissima'
- 'Aporrhais angulata is recombined as Anchura angulata'
- 'Aporrhais californica is recombined as Arrhoges californica'
- 'Aporrhais exilis is recombined as Drepanochilus exilis'
- 'Aporrhais falciformis is recombined as Anchura falciformis'
- 'Architectonica cognata is recombined as Architectonica (Stellaxis) cognata'
- 'Architectonica hornii belongs to Architectonica'
- 'Architectonica inornata is recombined as Margarites (Atira) inornatus'
- 'Architectonica veatchii belongs to Architectonica'
- 'Ataphrus crassus belongs to Ataphrus'
- 'Atresius liratus belongs to Atresius'
- 'Aulacofusus [misspelled as Colus (Aulocofusus)] belongs to Colus'
- 'Bela clathrata is a subjective synonym of Surculites mathewsonii'
- 'Brachysphingus gabbi belongs to Brachysphingus'
- 'Brachysphingus sinuatus belongs to Brachysphingus'
- 'Brachysphingus liratus is replaced by Brachysphingus gabbi'
- 'Bulla hornii is recombined as Abderospira hornii'
- 'Bullaea gabbiana is recombined as Megistostoma gabbiana'
- 'Bullia (Molopophorus) striata is recombined as Molopophorus striatus'
- 'Busycon blakei is recombined as Pseudoperissolax blakei'
- 'Calyptraea (Siphopatella) mamillaris is recombined as Calyptraea mamillaris'
- 'Calyptraea calabasasensis is a subjective synonym of Calyptraea diegoana'
- 'Calyptraea washingtonensis belongs to Calyptraea' according to Weaver 1916
- 'Calyptraea washingtonensis is a subjective synonym of Calyptraea diegoana'
- 'Cancellaria (Euclia) vetusta is recombined as Cancellaria vetusta'
- 'Cancellaria altispira is recombined as Cancellaria (Progabbia) altispira'
- 'Cancellaria andersoni is a subjective synonym of Cancellaria vetusta'
- 'Cancellaria ramonensis is a subjective synonym of Cancellaria vetusta'
- 'Cancellaria stantoni is a subjective synonym of Bonellitia (Admetula) paucivaricata'
- 'Cerithiopsis dumblei is recombined as Cerithium dumblei'
- 'Chrysodomus burroensis is a subjective synonym of Sycum mucronatum'
- 'Cinulia mathewsonii is recombined as Avellana mathewsonii'
- 'Cinulia obliqua is recombined as Oligoptycha obliqua'
- 'Cinulia pinguis is recombined as Tornatellaea pinguis'
- 'Fusus californicus is replaced by Ranellina pilsbryi'
- 'Clavella gravida is recombined as Bruclarkia gravida'
- 'Confusiscala was reranked as Epitonium (Confusiscala) and belongs to Epitonium'
- 'Conus hornii belongs to Conus'
- 'Conus remondii belongs to Conus'
- 'Conus sinuatus is recombined as Surculites sinuatus'
- 'Cophocara stantoni belongs to Cophocara'
- 'Cordiera microptygma is recombined as Exilia microptygma'
- 'Cordiera mitraeformis is recombined as Volutoderma mitraeformis'
- 'Crepidula dickersoni is a subjective synonym of Crepidula pileum'
- 'Crepidula inornata is a subjective synonym of Crepidula pileum'
- 'Crepidula (Spirocrypta) is an invalid subgroup of Crepidula'
- 'Crypta (Spirocrypta) pileum is recombined as Crepidula pileum'
- 'Cuma biplicata is recombined as Molopophorus biplicatus'
- 'Cylichna costata is recombined as Scaphander (Mirascapha) costata'
- 'Cylichnella tantilla is recombined as Cylichnina tantilla'
- 'Cylindrites brevis is replaced by Noetca gabbi'
- 'Cypraea (Epona) mathewsonii is recombined as Cypraea mathewsonii'
- 'Cypraea castacensis belongs to Cypraea'
- 'Cypraea kerniana is a subjective synonym of Cypraea mathewsonii'
- 'Discohelix leana belongs to Discohelix'
- 'Ectinochilus (Dasyostoma) belongs to Ectinochilus'
- 'Emarginula belongs to Fissurellidae'
- 'Emarginula gabbi belongs to Emarginula'
- 'Emarginula radiata is replaced by Emarginula gabbi'
- 'Exilia waringi is a subjective synonym of Exilia microptygma'
- 'Fasciolaria io is recombined as Nekewis io'
- 'Fasciolaria sinuata is recombined as Whitneyella sinuata'
- 'Ficus cypraeoides is recombined as Sycodes cypraeoides'
- 'Ficus mamillatus belongs to Ficus'
- 'Ficus pyriformis is a subjective synonym of Ficus modestus'
- 'Fusus (Hemifusus) cooperii is replaced by Ficopsis cooperiana'
- 'Fusus (Hemifusus) hornii is recombined as Ficopsis hornii'
- 'Fusus (Hemifusus) remondii is recombined as Ficopsis remondii'
- 'Fusus averillii is recombined as Volutoderma averillii'
- 'Fusus diaboli is recombined as Exilia diaboli'
- 'Fusus martinez is recombined as Whitneyella martinez'
- 'Fusus martinezensis belongs to Fusus' according to Weaver 1905
- 'Fusus martinezensis is a nomen nudum'
- 'Fusus mathewsonii is recombined as Surculites mathewsonii'
- 'Fusus occidentalis is recombined as Pseudoperissolax occidentalis'
- 'Fusus oregonensis is recombined as Ficus (Trophosycon) oregonensis'
- 'Galerus excentricus is a subjective synonym of Calyptraea diegoana'
- 'Gyrodes expansa belongs to Gyrodes'
- 'Gyrodes insecuris is a subjective synonym of Lacunaria striata'
- 'Haydenia belongs to Cassididae'
- 'Helcion dichotoma is recombined as Hipponix dichotomus'
- 'Helicaulax costata is recombined as Araeodactylus costatus'
- 'Heteroterma trochoidea belongs to Heteroterma'
- 'Liocium punctatum belongs to Liocium'
- 'Littorina compacta is recombined as Ataphrus compactus'
- 'Littorina remondii belongs to Littorina'
- 'Loxotrema turrita is corrected as Loxotrema turritum and belongs to Loxotrema'
- 'Lunatia (Gyrodes) conradiana is recombined as Gyrodes conradiana'
- 'Lunatia avellana is recombined as Ampullina avellana'
- 'Lunatia cowlitzensis is a subjective synonym of Euspira nuciformis'
- 'Lunatia hornii is recombined as Polinices hornii'
- 'Lunatia nuciformis is recombined as Euspira nuciformis'
- 'Lunatia shumardiana is recombined as Polinices shumardianus'
- 'Lysis duplicosta belongs to Lysis'
- 'Margaritella angulata is recombined as Solariella anguista'
- 'Margaritella crenulata is recombined as Solariella crenulata'
- 'Margarites (Atira) belongs to Margarites'
- 'Metula remondii is recombined as Pseudotoma remondii'
- 'Mitra cretacea belongs to Mitra'
- 'Molopophorus tejonensis is a subjective synonym of Molopophorus cretaceus'
- 'Morio (Sconsia) tuberculatus is recombined as Galeodea tuberculiformis'
- 'Murex beali is a subjective synonym of Murex whitneyi'
- 'Murex monoceros belongs to Murex' according to Sowerby 1840
- 'Murex monoceros is recombined as Purpura monoceros'
- 'Nassa antiquata is recombined as Molopophorus antiquatus'
- 'Nassa cretacea is recombined as Molopophorus cretaceus'
- 'Natica alveata is replaced by Amaurellina moragai'
- 'Natica fiasco is a subjective synonym of Neverita globosa'
- 'Natica hannibali is recombined as Globularia hannibali'
- 'Natica uvasana belongs to Natica'
- 'Naticina obliqua is recombined as Sinum obliquum'
- 'Neptunea (Tritonofusus) cretacea is recombined as Neptunea cretacea'
- 'Neptunea altispira belongs to Neptunea'
- 'Neptunea curvirostris is recombined as Plectocion curvirostris'
- 'Neptunea hoffmannii is a subjective synonym of Paladmete perforata'
- 'Neptunea humerosa belongs to Neptunea'
- 'Neptunea mucronata is recombined as Sycum mucronatum'
- 'Neptunea perforata is recombined as Paladmete perforata'
- 'Neptunea ponderosa is recombined as Eripachya ponderosa'
- 'Neptunea recurva is recombined as Colus (Aulocofusus) recurvus'
- 'Neptunea supraplicata is recombined as Ectinochilus (Cowlitzia) canalifer supraplicata'
- 'Nerita cuneata is recombined as Velates cuneatus'
- 'Neverita globosa belongs to Neverita'
- 'Neverita secta belongs to Neverita'
- 'Neverita weaveri is a subjective synonym of Neverita secta'
- 'Niso polita belongs to Niso'
- 'Noetca gabbi belongs to Noetca'
- 'Olivella mathewsonii belongs to Olivella'
- 'Pachypoma was reranked as Astraea (Pachypoma) and belongs to Astraea'
- 'Pachypoma biangulata is recombined as Astraea (Pachypoma) biangulata'
- 'Perissolax brevirostris is recombined as Perissitys brevirostris'
- 'Potamides davisiana is a subjective synonym of Surculites mathewsonii'
- 'Potamides diadema belongs to Potamides'
- 'Potamides tenuis belongs to Potamides'
- 'Progabbia was reranked as Cancellaria (Progabbia) and belongs to Cancellaria'
- 'Pseudoliva lineata belongs to Pseudoliva'
- 'Pseudoliva volutaeformis belongs to Pseudoliva'
- 'Pugnellus hamulus is recombined as Conchothyra hamula'
- 'Pugnellus manubriatus is recombined as Pugnellus (Gymnarus) manubriatus'
- 'Pyrula modesta is recombined as Ficus modestus'
- 'Rimella rugostoma is recombined as Ectinochilus (Dasyostoma) rugostoma'
- 'Ringicula varia belongs to Ringicula'
- 'Ringinella polita is recombined as Acteon politus'
- 'Rostellaria (Rimella) canalifera is recombined as Ectinochilus (Cowlitzia) canalifer'
- 'Rostellaria bicarinata is recombined as Tessarolax bicarinata'
- 'Scalaria (Opalia) mathewsonii is recombined as Epitonium (Confusiscala) mathewsonii'
- 'Sigaretus was reranked as Sinum (Sigaretus) and belongs to Sinum' according to Trask 1922
- 'Sigaretus scopulosus is recombined as Sinum scopulosum'
- 'Sinum (Sigaretus) trigenarium is a subjective synonym of Sinum scopulosum'
- 'Sinum californicum is a subjective synonym of Sinum scopulosum'
- 'Sinum coryliforme is a subjective synonym of Sinum obliquum'
- 'Sinum dickersoni is a subjective synonym of Lacunaria striata'
- 'Sinum occidentis is a subjective synonym of Sinum obliquum'
- 'Sinum planicostum is a subjective synonym of Sinum scopulosum'
- 'Siphopatella was reranked as Calyptraea (Siphopatella) and belongs to Calyptraea' according to Broderip 1835
- 'Straparollus lens is recombined as Ventridens lens'
- 'Straparollus paucivolvus belongs to Straparollus'
- 'Surcula (Surculites) inconspicua is recombined as Tessarolax inconspicua'
- 'Surcula alizensis is a subjective synonym of Nekewis io'
- 'Surcula gesteri is a subjective synonym of Scobinella claytonensis'
- 'Surcula ioformis is a subjective synonym of Nekewis io'
- 'Terebra californica belongs to Terebra'
- 'Tessarolax distorta belongs to Tessarolax'
- 'Tritonium californicum is recombined as Gyrineum californicum'
- 'Tritonium diegoensis is recombined as Buccinofusus diegoensis'
- 'Tritonium hornii is recombined as Olequahia hornii'
- 'Tritonium paucivaricatum is recombined as Bonellitia (Admetula) paucivaricata'
- 'Tritonium whitneyi is recombined as Murex whitneyi'
- 'Trochita diegoana is recombined as Calyptraea diegoana'
- 'Trochita inornata is a subjective synonym of Calyptraea mamillaris'
- 'Trophon ponderosum is recombined as Thais (Stramonita) ponderosa'
- 'Turbinella crassitesta is recombined as Retipirula crassitesta'
- 'Turbonilla aspera is recombined as Bittium asperum'
- 'Turris (Drillia) varicostata is recombined as Pleurofusia raricostata'
- 'Turris claytonensis is recombined as Scobinella claytonensis'
- 'Turritella chicoensis belongs to Turritella'
- 'Turritella hoffmannii is a subjective synonym of Turritella inezana'
- 'Turritella inezana belongs to Turritella'
- 'Turritella infragranulata is recombined as Turritella (Haustator) infragranulata'
- 'Turritella maccreadyi is a subjective synonym of Mesalia martinezensis'
- 'Turritella martinezensis is recombined as Mesalia martinezensis'
- 'Turritella pachecoensis is recombined as Turritella (Haustator) pachecoensis'
- 'Turritella robusta belongs to Turritella'
- 'Turritella seriatimgranulata belongs to Turritella'
- 'Turritella simiensis is a subjective synonym of Turritella (Haustator) pachecoensis'
- 'Turritella uvasana belongs to Turritella'
- 'Turritella veatchii is recombined as Elimia veatchii'
- 'Typhis antiquus belongs to Typhis'
- 'Urosyca caudata is recombined as Priscoficus caudatus'
- 'Volutilithes navarroensis is a subjective synonym of Volutoderma averillii'
- 'Strepsidura ficus is a nomen nudum'