Opinions from J. W. Durham 1944
- 'Acila belongs to Nuculidae'
- 'Acila (Acila) belongs to Acila'
- 'Acila (Truncacila) belongs to Acila'
- 'Acila muta is recombined as Acila (Truncacila) muta'
- 'Acila nehalemensis belongs to Acila' according to Hanna 1924
- 'Acila nehalemensis is recombined as Acila (Truncacila) nehalemensis'
- 'Acmaea belongs to Acmaeidae'
- 'Acmaea mitra sookensis is recombined as Acmaea sookensis'
- 'Acmaea oakvillensis belongs to Acmaea'
- 'Acmaea simplex belongs to Acmaea' according to Dickerson 1917
- 'Acmaea simplex belongs to Acmaea'
- 'Acrilla belongs to Epitoniidae'
- 'Acrilla (Ferminoscala) becki belongs to Acrilla (Ferminoscala)'
- 'Acrilla (Undiscala) olympicensis belongs to Acrilla (Undiscala)'
- 'Acrilla dickersoni is recombined as Acrilla (Ferminoscala) dickersoni'
- 'Acteocina chehalisensis is recombined as Acteon chehalisensis'
- 'Acteon belongs to Acteonidae'
- 'Acteon parvum belongs to Acteon' according to Dickerson 1917
- 'Aforia belongs to Turridae'
- 'Aforia campbelli belongs to Aforia'
- 'Agasoma acuminatum is recombined as Bruclarkia acuminatum'
- 'Agasoma columbianum is recombined as Bruclarkia columbianum'
- 'Agasoma yaquinanum is recombined as Bruclarkia yaquinanum'
- 'Amauropsis belongs to Naticidae'
- 'Amphissa belongs to Pyrenidae'
- 'Amphissa pulchrilineata belongs to Amphissa'
- 'Anadara belongs to Arcidae'
- 'Ancilla belongs to Olividae'
- 'Ancilla blakeleyensis belongs to Ancilla'
- 'Ancillaria fishii is recombined as Molopophorus fishii'
- 'Ancistrolepis belongs to Neptuneidae'
- 'Ancistrolepis clarki belongs to Ancistrolepis' according to Tegland 1933
- 'Ancistrolepis clarki belongs to Ancistrolepis'
- 'Ancistrolepis clarki teglandae belongs to Ancistrolepis clarki'
- 'Ancistrolepis landesi belongs to Ancistrolepis' according to Tegland 1933
- 'Ancistrolepis landesi belongs to Ancistrolepis'
- 'Ancistrolepis packardi belongs to Ancistrolepis'
- 'Apolymetis belongs to Tellinidae'
- 'Apolymetis twinensis belongs to Apolymetis'
- 'Arca belongs to Arcidae'
- 'Arca osmonti belongs to Arca' according to Dall 1909
- 'Arca osmonti is recombined as Anadara osmonti'
- 'Arca washingtoniana belongs to Arca' according to Dickerson 1917
- 'Archohelia weaveri belongs to Archohelia'
- 'Arctoscala condoni is recombined as Epitonium (Boreoscala) condoni'
- 'Argobuccinum belongs to Cymatiidae'
- 'Astrangia clarki belongs to Astrangia'
- 'Balanophyllia fulleri belongs to Balanophyllia'
- 'Balanophyllia teglandae belongs to Balanophyllia'
- 'Balantium belongs to Cavolinidae'
- 'Barbatia belongs to Arcidae'
- 'Bezoardica was reranked as Phalium (Bezoardica) and belongs to Phalium'
- 'Bittium belongs to Cerithiidae'
- 'Bittium bramkampi belongs to Bittium'
- 'Boreoscala was reranked as Epitonium (Boreoscala) and belongs to Epitonium'
- 'Borsonella nuncapatia belongs to Borsonella' according to Hanna 1924
- 'Borsonella nuncapatia is recombined as Irenosyrinx nuncapatia'
- 'Bruclarkia belongs to Neptuneidae'
- 'Bruclarkia blakeleyensis belongs to Bruclarkia'
- 'Bruclarkia fulleri belongs to Bruclarkia'
- 'Bruclarkia seattlensis belongs to Bruclarkia'
- 'Bruclarkia thor belongs to Bruclarkia' according to Tegland 1931
- 'Bruclarkia thor belongs to Bruclarkia'
- 'Bullia (Molopophorus) was reranked as Molopophorus and belongs to Buccinidae'
- 'Calliostoma belongs to Trochidae'
- 'Calliostoma mea belongs to Calliostoma'
- 'Calliostoma mea belongs to Calliostoma' according to Tegland 1933
- 'Calliostoma parkeri belongs to Calliostoma'
- 'Callocallista arnoldi is recombined as Pitaria (Katherinella) arnoldi'
- 'Callocardia (Agriopoma) californica belongs to Callocardia (Agriopoma)' according to Clark 1918
- 'Callocardia (Agriopoma) californica is recombined as Pitaria (Katherinella) californica'
- 'Calyptraea belongs to Calyptraeidae'
- 'Calyptraea sookensis belongs to Calyptraea'
- 'Cancellaria belongs to Cancellariidae'
- 'Cancellaria landesi belongs to Cancellaria'
- 'Cancellaria washingtonensis belongs to Cancellaria' according to Weaver 1916
- 'Cancellaria washingtonensis belongs to Cancellaria'
- 'Cardiomya was reranked as Cuspidaria (Cardiomya) and belongs to Cuspidaria'
- 'Cardita subtenta is recombined as Venericardia (Cyclocardia) subtenta'
- 'Cardium (Cerastoderma) scapoosense belongs to Cardium (Cerastoderma)' according to Clark 1925
- 'Cardium (Cerastoderma) scapoosense is recombined as Clinocardium scapoosensis'
- 'Cardium cooperii lorenzanum is recombined as Nemocardium lorenzanum'
- 'Cardium dickersoni is recombined as Trachycardium dickersoni'
- 'Cardium lincolnensis belongs to Cardium' according to Weaver 1916
- 'Cardium lincolnensis is recombined as Plagiocardium lincolnensis'
- 'Cardium weaveri belongs to Cardium'
- 'Caryophyllia blakeleyensis belongs to Caryophyllia'
- 'Caryophyllia woodmanensis belongs to Caryophyllia'
- 'Cerithiopsis belongs to Cerithiopsidae'
- 'Cerithiopsis oregonensis is recombined as Turritella oregonensis'
- 'Cerithiopsis palmerae belongs to Cerithiopsis'
- 'Chione belongs to Veneridae'
- 'Chione carmanahensis belongs to Chione' according to Clark 1925
- 'Chione carmanahensis belongs to Chione'
- 'Chione cathcartensis belongs to Chione'
- 'Chlamys was reranked as Pecten (Chlamys) and belongs to Pecten'
- 'Chlorostoma arnoldi belongs to Chlorostoma' according to Weaver 1912
- 'Chlorostoma arnoldi is recombined as Tegula arnoldi'
- 'Cirsotrema was reranked as Epitonium (Cirsotrema) and belongs to Epitonium'
- 'Clavatula belongs to Turridae'
- 'Clavus belongs to Turridae'
- 'Clavus (Crassispira) bravinderi belongs to Clavus (Crassispira)'
- 'Clinocardium belongs to Cardiidae'
- 'Cochlodesma belongs to Periplomatidae'
- 'Cochlodesma bainbridgensis belongs to Cochlodesma'
- 'Conchocele disjuncta is recombined as Thyasira disjuncta'
- 'Conus belongs to Conidae'
- 'Conus ruckmani belongs to Conus' according to Dickerson 1917
- 'Conus ruckmani belongs to Conus'
- 'Corbicula belongs to Cyrenidae'
- 'Corbidae belongs to Pelecypoda'
- 'Corbis belongs to Corbidae'
- 'Corbis washingtoniana belongs to Corbis'
- 'Corbula belongs to Corbulidae'
- 'Corbula cowlitzensis belongs to Corbula' according to Dickerson 1917
- 'Corbula cowlitzensis belongs to Corbula'
- 'Crassatellites belongs to Crassatellitidae'
- 'Crassatellites washingtoniana belongs to Crassatellites'
- 'Crassatellites washingtoniana nygreni belongs to Crassatellites washingtoniana'
- 'Crassispira was reranked as Clavus (Crassispira) and belongs to Clavus'
- 'Crenella belongs to Mytilidae'
- 'Crenella porterensis belongs to Crenella'
- 'Crenella washingtonensis belongs to Crenella'
- 'Crepidula belongs to Crepidulidae'
- 'Crepidula sookensis belongs to Crepidula'
- 'Crepidula ungana belongs to Crepidula'
- 'Crypta (Spirocrypta) pileum is recombined as Crepidula pileum'
- 'Cryptogemma borgenae is recombined as Irenosyrinx borgenae'
- 'Cuspidaria belongs to Cuspidariidae'
- 'Cuspidaria (Cardiomya) alkiensis belongs to Cuspidaria (Cardiomya)'
- 'Cyclocardia was reranked as Venericardia (Cyclocardia) and belongs to Venericardia'
- 'Cylichnina belongs to Scaphandridae'
- 'Cylichnina turneri belongs to Cylichnina' according to Effinger 1938
- 'Cylichnina turneri belongs to Cylichnina'
- 'Cypraeogemmula belongs to Cypraeidae'
- 'Cypraeogemmula warnerae belongs to Cypraeogemmula'
- 'Cyrene (Corbicula) sookensis is recombined as Corbicula sookensis'
- 'Cytherea oregonensis belongs to Cytherea' according to Conrad 1848
- 'Cytherea oregonensis is recombined as Pitar oregonensis'
- 'Dentalium conradi belongs to Dentalium'
- 'Dentalium conradi belongs to Dentalium' according to Dall 1909
- 'Dentalium petricola belongs to Dentalium'
- 'Dentalium porterensis belongs to Dentalium'
- 'Diplodonta dalli belongs to Diplodonta' according to Dickerson 1917
- 'Diplodonta dalli is recombined as Lucina (Here) dalli'
- 'Drillia chehalisensis is recombined as Priscofusus chehalisensis'
- 'Echinophoria belongs to Cassididae'
- 'Epitonium belongs to Epitoniidae'
- 'Epitonium (Arctoscala) saundersi is recombined as Epitonium (Cirsotrema) saundersi'
- 'Epitonium (Boreoscala) condoni hadlockense belongs to Epitonium (Boreoscala) condoni' according to Durham 1937
- 'Epitonium (Boreoscala) condoni hadlockense belongs to Epitonium (Boreoscala) condoni'
- 'Epitonium (Boreoscala) condoni quimperense belongs to Epitonium (Boreoscala) condoni' according to Durham 1937
- 'Epitonium (Boreoscala) condoni quimperense belongs to Epitonium (Boreoscala) condoni'
- 'Epitonium (Boreoscala) condoni townsendense belongs to Epitonium (Boreoscala) condoni' according to Durham 1937
- 'Epitonium (Boreoscala) condoni townsendense belongs to Epitonium (Boreoscala) condoni'
- 'Epitonium (Boreoscala) condoni woodmanense belongs to Epitonium (Boreoscala) condoni' according to Durham 1937
- 'Epitonium (Boreoscala) condoni woodmanense belongs to Epitonium (Boreoscala) condoni'
- 'Erato belongs to Cypraeidae'
- 'Erato mackini belongs to Erato'
- 'Eusmilia bainbridgensis belongs to Eusmilia'
- 'Euspira was reranked as Polinices (Euspira) and belongs to Polinices'
- 'Exilia belongs to Turridae'
- 'Exilia lincolnensis belongs to Exilia'
- 'Exilia mclellani belongs to Exilia' according to Tegland 1933
- 'Exilia mclellani is recombined as Turricula mclellani'
- 'Ferminoscala was reranked as Acrilla (Ferminoscala) and belongs to Acrilla'
- 'Ficus belongs to Ficidae'
- 'Ficus gesteri belongs to Ficus'
- 'Ficus restorationensis belongs to Ficus'
- 'Fusinus (Priscofusus) hannibali is recombined as Priscofusus hannibali'
- 'Fusinus (Priscofusus) stewarti is recombined as Priscofusus stewarti'
- 'Galeodea apta is recombined as Echinophoria apta'
- 'Galeodea dalli is recombined as Echinophoria dalli'
- 'Galeodea fax belongs to Galeodea' according to Tegland 1931
- 'Galeodea fax is recombined as Echinophoria fax'
- 'Galeodea rex belongs to Galeodea' according to Tegland 1931
- 'Galeodea rex is recombined as Echinophoria rex'
- 'Gariidae belongs to Pelecypoda'
- 'Gemmula bentsonae belongs to Gemmula'
- 'Glycimeris estrellana belongs to Glycimeris' according to Conrad 1857
- 'Glycimeris estrellana is recombined as Panope estrellana'
- 'Glycymeris belongs to Arcidae'
- 'Glycymeris chehalisensis belongs to Glycymeris'
- 'Glycymeris vancouverensis belongs to Glycymeris'
- 'Goniobasis belongs to Thiaridae'
- 'Gyrineum belongs to Cymatiidae'
- 'Gyrineum goodspeedi belongs to Gyrineum' according to Tegland 1933
- 'Gyrineum goodspeedi is recombined as Argobuccinum goodspeedi'
- 'Gyrineum jeffersonensis belongs to Gyrineum'
- 'Gyrineum kincaidi belongs to Gyrineum'
- 'Haminoea belongs to Akeridae'
- 'Hemifusus lincolnensis is recombined as Perse lincolnensis'
- 'Hemipleurotoma belongs to Turridae'
- 'Hemipleurotoma oostinghi belongs to Hemipleurotoma'
- 'Hipponyx belongs to Hipponicidae'
- 'Hipponyx arnoldi belongs to Hipponyx' according to Dickerson 1917
- 'Hipponyx arnoldi belongs to Hipponyx'
- 'Homalopoma belongs to Turbinidae'
- 'Homalopoma coombsi belongs to Homalopoma'
- 'Homalopoma effingeri belongs to Homalopoma'
- 'Irenosyrinx belongs to Turridae'
- 'Knefastia was reranked as Clavatula (Knefastia) and belongs to Clavatula'
- 'Leda alkiensis belongs to Leda' according to Clark 1925
- 'Leda alkiensis is recombined as Nuculana alkiensis'
- 'Leda lincolnensis is recombined as Nuculana lincolnensis'
- 'Leda merriami belongs to Leda' according to Dickerson 1917
- 'Leda merriami is recombined as Nuculana merriami'
- 'Leda ochsneri is recombined as Nuculana ochsneri'
- 'Leda washingtonensis is recombined as Nuculana washingtonensis'
- 'Lima belongs to Limidae'
- 'Lima bela belongs to Lima' according to Dickerson 1917
- 'Lima bela belongs to Lima'
- 'Lima robertsae belongs to Lima'
- 'Lima twinensis belongs to Lima'
- 'Limopsis belongs to Limopsidae'
- 'Limopsis carmanahensis belongs to Limopsis' according to Clark 1925
- 'Limopsis carmanahensis belongs to Limopsis'
- 'Lucina belongs to Lucinidae'
- 'Lucina (Here) belongs to Lucina'
- 'Lucina acutilineata is recombined as Lucina (Myrtea) acutilineata'
- 'Macoma belongs to Tellinidae'
- 'Macoma indentata is recombined as Macoma (Rexithaerus) indentata'
- 'Macoma twinensis belongs to Macoma'
- 'Macrocallista belongs to Veneridae'
- 'Macrocallista weaveri belongs to Macrocallista' according to Clark 1918
- 'Macrocallista weaveri belongs to Macrocallista'
- 'Mactra belongs to Mactridae'
- 'Mactra (Spisula) sammamishensis belongs to Mactra (Spisula)'
- 'Malletia chehalisensis is recombined as Yoldia chehalisensis'
- 'Marcia belongs to Veneridae'
- 'Margarites belongs to Trochidae'
- 'Margarites chappelli belongs to Margarites'
- 'Marginella belongs to Marginellidae'
- 'Marginella (Serrata) teglandae belongs to Marginella (Serrata)'
- 'Marginella instabilata belongs to Marginella' according to Hanna 1924
- 'Marginella instabilata belongs to Marginella'
- 'Marginella shepardae belongs to Marginella' according to Tegland 1933
- 'Marginella shepardae belongs to Marginella'
- 'Melanella belongs to Melanellidae'
- 'Mercimonia was reranked as Marcia (Mercimonia) and belongs to Marcia'
- 'Meretrix pittsburgensis belongs to Meretrix' according to Dall 1900
- 'Meretrix pittsburgensis is recombined as Macrocallista pittsburgensis'
- 'Mesalia lincolnensis is recombined as Acrilla (Ferminoscala) lincolnensis'
- 'Miopleiona belongs to Volutidae'
- 'Miopleiona scowensis belongs to Miopleiona'
- 'Miopleiona weaveri belongs to Miopleiona'
- 'Modiolus porterensis belongs to Modiolus' according to Clark 1925
- 'Modiolus porterensis is recombined as Volsella porterensis'
- 'Modiolus trinominata belongs to Modiolus' according to Hanna 1924
- 'Modiolus trinominata is recombined as Volsella trinominata'
- 'Moerella was reranked as Tellina (Moerella) and belongs to Tellina'
- 'Molopophorus dalli belongs to Molopophorus'
- 'Molopophorus effingeri belongs to Molopophorus' according to Effinger 1938
- 'Molopophorus effingeri belongs to Molopophorus'
- 'Molopophorus gabbi belongs to Molopophorus'
- 'Molopophorus lincolnensis belongs to Molopophorus' according to Weaver 1916
- 'Molopophorus lincolnensis belongs to Molopophorus'
- 'Molopophorus lincolnensis weaveri belongs to Molopophorus lincolnensis'
- 'Molopophorus stephensoni belongs to Molopophorus' according to Dickerson 1917
- 'Molopophorus stephensoni belongs to Molopophorus'
- 'Myrtea was reranked as Lucina (Myrtea) and belongs to Lucina'
- 'Mytiloconcha was reranked as Mytilus (Mytiloconcha) and belongs to Mytilus'
- 'Mytilus belongs to Mytilidae'
- 'Mytilus mathewsonii is recombined as Mytilus (Mytiloconcha) mathewsonii'
- 'Mytilus sammamishensis belongs to Mytilus'
- 'Mytilus snohomishensis belongs to Mytilus'
- 'Mytilus stillaguamishensis belongs to Mytilus'
- 'Nassa newcombei is recombined as Molopophorus newcombei'
- 'Natica belongs to Naticidae'
- 'Natica (Natica) belongs to Natica'
- 'Natica (Natica) weaveri belongs to Natica (Natica)'
- 'Natica lincolnensis belongs to Natica' according to Weaver 1916
- 'Natica lincolnensis is recombined as Polinices lincolnensis'
- 'Natica oligocenica belongs to Natica'
- 'Natica teglandi is recombined as Natica (Natica) teglandae'
- 'Naticina obliqua is recombined as Sinum obliqua'
- 'Nautilus angustatus is recombined as Aturia angustata'
- 'Nekewis belongs to Turridae'
- 'Nekewis scowensis belongs to Nekewis'
- 'Nemocardium belongs to Cardiidae'
- 'Nerita belongs to Neritidae'
- 'Nerita vokesi belongs to Nerita'
- 'Neverita belongs to Naticidae'
- 'Neverita nomlandi belongs to Neverita'
- 'Nucula (Acila) gettysburgensis belongs to Nucula (Acila)'
- 'Nucula (Acila) nelsoni belongs to Nucula (Acila)' according to Clark 1925
- 'Nucula (Acila) nelsoni is recombined as Acila (Truncacila) nelsoni'
- 'Nucula (Acila) pugetensis belongs to Nucula (Acila)' according to Clark 1925
- 'Nucula (Acila) pugetensis is recombined as Acila (Truncacila) pugetensis'
- 'Nucula (Acila) shumardi is recombined as Acila (Truncacila) shumardi'
- 'Nuculana belongs to Nuculanidae'
- 'Nuttallia was reranked as Sanguinolaria (Nuttallia) and belongs to Sanguinolaria'
- 'Odostomia belongs to Pyramidellidae'
- 'Odostomia (Odostomia) belongs to Odostomia'
- 'Odostomia (Odostomia) winlockiana belongs to Odostomia (Odostomia)'
- 'Olequahia belongs to Bursidae'
- 'Olequahia schencki belongs to Olequahia'
- 'Opalia belongs to Epitoniidae'
- 'Opalia (Opalia) belongs to Opalia'
- 'Opalia (Opalia) bravinderi belongs to Opalia (Opalia)'
- 'Ostraea lincolnensis belongs to Ostraea'
- 'Ostrea belongs to Ostreidae'
- 'Ostrea griesensis belongs to Ostrea'
- 'Ostrea idriaensis belongs to Ostrea'
- 'Oxystele belongs to Trochidae'
- 'Oxystele dorni belongs to Oxystele'
- 'Palliolum belongs to Pectinidae'
- 'Palliolum (Delectopecten) belongs to Palliolum'
- 'Pandora belongs to Pandoridae'
- 'Pandora vanwinkleae belongs to Pandora'
- 'Pandora washingtonensis belongs to Pandora'
- 'Panope belongs to Saxicavidae'
- 'Panopea generosa is recombined as Panope generosa'
- 'Pecten belongs to Pectinidae'
- 'Pecten (Chlamys) fucanus is recombined as Pecten (Patinopecten) fucanus'
- 'Pecten (Chlamys) grunskyi belongs to Pecten (Chlamys)' according to Hertlein 1929
- 'Pecten (Patinopecten) belongs to Pecten'
- 'Pecten (Propeamusium) clallamensis belongs to Pecten (Propeamusium)'
- 'Pecten porterensis is recombined as Pecten (Chlamys) porterensis'
- 'Pecten vanwinkleae belongs to Pecten' according to Clark 1935
- 'Pecten vanwinkleae is recombined as Palliolum (Delectopecten) vanwinkleae'
- 'Peronidia was reranked as Tellina (Peronidia) and belongs to Tellina'
- 'Perse belongs to Neptuneidae'
- 'Perse olympicensis belongs to Perse'
- 'Perse olympicensis quimperensis belongs to Perse olympicensis'
- 'Perse teglandae belongs to Perse'
- 'Phalium belongs to Cassididae'
- 'Phalium (Bezoardica) egberti is recombined as Phalium egberti'
- 'Pitar belongs to Veneridae'
- 'Pitar (Lamelliconcha) belongs to Pitar'
- 'Pitaria (Katherinella) belongs to Pitaria'
- 'Pitaria clarki is recombined as Pitaria (Lamelliconcha) clarki'
- 'Pitaria lorenzana belongs to Pitaria'
- 'Pitaria lorenzana belongs to Pitaria' according to Clark 1918
- 'Plagiocardium belongs to Cardiidae'
- 'Plectosolen was reranked as Solen (Plectosolen) and belongs to Solen'
- 'Pleurotoma (Gemmula) was reranked as Gemmula and belongs to Turridae'
- 'Pleurotoma washingtoniana is recombined as Clavatula (Knefastia) washingtoniana'
- 'Polinices belongs to Naticidae'
- 'Polinices (Euspira) blakeleyensis is recombined as Amauropsis blakeleyensis'
- 'Polinices (Euspira) blakeleyensis belongs to Polinices (Euspira)' according to Tegland 1933
- 'Polinices (Euspira) rectus belongs to Polinices (Euspira)' according to Tegland 1933
- 'Polinices (Euspira) rectus belongs to Polinices (Euspira)'
- 'Polinices (Euspira) victoriana belongs to Polinices (Euspira)'
- 'Pollia belongs to Buccinidae'
- 'Pollia dickersoni belongs to Pollia'
- 'Priscofusus belongs to Turridae'
- 'Priscofusus foxi belongs to Priscofusus'
- 'Pseudomelatoma belongs to Turridae'
- 'Pseudomelatoma fulleri belongs to Pseudomelatoma'
- 'Pseudoperissolax belongs to Muricidae'
- 'Pseudoperissolax trophonoides belongs to Pseudoperissolax' according to Tegland 1933
- 'Pseudoperissolax trophonoides belongs to Pseudoperissolax'
- 'Pseudotoma belongs to Turridae'
- 'Pseudotoma chaneyi belongs to Pseudotoma'
- 'Puncturella belongs to Fissurellidae'
- 'Puncturella barksdalei belongs to Puncturella'
- 'Pyramidella belongs to Pyramidellidae'
- 'Rexithaerus was reranked as Macoma (Rexithaerus) and belongs to Macoma'
- 'Ringicula belongs to Ringiculidae'
- 'Ringicula (Ringiculella) clarki belongs to Ringicula (Ringiculella)'
- 'Ringiculina was reranked as Ringicula (Ringiculina) and belongs to Ringicula'
- 'Sanguinolaria belongs to Gariidae'
- 'Sanguinolaria (Nuttallia) townsendensis belongs to Sanguinolaria (Nuttallia)' according to Clark 1925
- 'Sanguinolaria (Nuttallia) townsendensis belongs to Sanguinolaria (Nuttallia)'
- 'Scaphander belongs to Scaphandridae'
- 'Scaphander stewarti belongs to Scaphander'
- 'Scaphander washingtonensis belongs to Scaphander' according to Tegland 1933
- 'Scaphander washingtonensis belongs to Scaphander'
- 'Scaphander washingtonensis gordoni belongs to Scaphander washingtonensis' according to Tegland 1933
- 'Scaphander washingtonensis gordoni is recombined as Scaphander gordoni'
- 'Searlesia belongs to Neptuneidae'
- 'Searlesia olympicensis belongs to Searlesia'
- 'Segmentina belongs to Planorbidae'
- 'Segmentina durhami belongs to Segmentina' according to Hanna and Hertlein 1938
- 'Segmentina durhami belongs to Segmentina'
- 'Seraphs belongs to Strombidae'
- 'Seraphs andersoni belongs to Seraphs'
- 'Seraphs andersoni belongs to Seraphs' according to Dickerson 1917
- 'Serrata was reranked as Marginella (Serrata) and belongs to Marginella'
- 'Siderastrea vancouverensis belongs to Siderastrea'
- 'Siderastrea washingtonensis belongs to Siderastrea'
- 'Sigaretus scopulosus is recombined as Sinum scopulosus'
- 'Sinum belongs to Naticidae'
- 'Siphonalia belongs to Neptuneidae'
- 'Siphonalia hadlockensis belongs to Siphonalia'
- 'Siphonalia teglandae belongs to Siphonalia'
- 'Siphonalia washingtonensis belongs to Siphonalia' according to Weaver 1916
- 'Siphonalia washingtonensis belongs to Siphonalia'
- 'Siphonalia washingtonensis weaveri belongs to Siphonalia washingtonensis'
- 'Solariella belongs to Trochidae'
- 'Solariella kincaidi belongs to Solariella' according to Tegland 1933
- 'Solariella kincaidi belongs to Solariella'
- 'Solemya belongs to Solemyacidae'
- 'Solemya dalli belongs to Solemya'
- 'Solemyacidae belongs to Pelecypoda'
- 'Solen belongs to Solenidae'
- 'Solen (Plectosolen) townsendensis belongs to Solen (Plectosolen)' according to Clark 1925
- 'Solen clallamensis belongs to Solen'
- 'Solen lincolnensis belongs to Solen' according to Weaver 1916
- 'Solen lincolnensis belongs to Solen'
- 'Spirotropis belongs to Turridae'
- 'Spirotropis bainbridgensis belongs to Spirotropis'
- 'Spirotropis campi belongs to Spirotropis'
- 'Spisula was reranked as Mactra (Spisula) and belongs to Mactra'
- 'Spisula (Hemimactra) hannibali is recombined as Mactra (Spisula) hannibali'
- 'Spisula albaria ramonensis is recombined as Mactra (Spisula) ramonensis'
- 'Spisula packardi is recombined as Mactra (Spisula) packardi'
- 'Spisula pittsburgensis is recombined as Mactra (Spisula) pittsburgensis'
- 'Spisula pittsburgensis frustra belongs to Spisula pittsburgensis' according to Tegland 1933
- 'Spisula pittsburgensis frustra is recombined as Mactra (Spisula) pittsburgensis frustra'
- 'Spisula ramonensis attenuata is recombined as Mactra (Spisula) ramonensis attenuata'
- 'Strepsidura lincolnensis belongs to Strepsidura' according to Weaver 1916
- 'Strepsidura lincolnensis is recombined as Olequahia lincolnensis'
- 'Strepsidura lincolnensis lorenzana is recombined as Olequahia lorenzana'
- 'Stylaster milleri belongs to Stylaster'
- 'Suavodrillia belongs to Turridae'
- 'Suavodrillia hertleini belongs to Suavodrillia'
- 'Surculites belongs to Turridae'
- 'Taras belongs to Ungulinidae'
- 'Taras goodspeedi belongs to Taras'
- 'Tegula belongs to Trochidae'
- 'Tellina belongs to Tellinidae'
- 'Tellina (Peronidia) oregonensis belongs to Tellina (Peronidia)' according to Conrad 1848
- 'Tellina (Peronidia) oregonensis belongs to Tellina (Peronidia)'
- 'Tellina gibsonensis belongs to Tellina' according to Van Winkle 1918
- 'Tellina gibsonensis is recombined as Thracia gibsonensis'
- 'Tellina lincolnensis belongs to Tellina' according to Weaver 1916
- 'Tellina lincolnensis is recombined as Tellina (Moerella) lincolnensis'
- 'Tellina lorenzoensis is recombined as Macoma lorenzoensis'
- 'Tellina ocoyana belongs to Tellina'
- 'Tellina pittsburgensis belongs to Tellina' according to Clark 1925
- 'Tellina pittsburgensis belongs to Tellina'
- 'Tellina townsendensis belongs to Tellina'
- 'Tellina woodmanensis belongs to Tellina'
- 'Terebratula oakvillensis [misspelled as Terebratula oakvilleensis] belongs to Terebratula'
- 'Thais nehalemensis is recombined as Nekewis nehalemensis'
- 'Thracia belongs to Thraciidae'
- 'Thracia condoni belongs to Thracia'
- 'Thracia schencki belongs to Thracia'
- 'Thracia trapezoides belongs to Thracia'
- 'Thyasira belongs to Thyasiridae'
- 'Trachycardium belongs to Cardiidae'
- 'Trichotropis belongs to Trichotropidae'
- 'Trichotropis alienensis belongs to Trichotropis' according to Effinger 1938
- 'Trichotropis alienensis belongs to Trichotropis'
- 'Trochita diegoana is recombined as Calyptraea diegoana'
- 'Trochocyathus townsendensis belongs to Trochocyathus'
- 'Trochus (Turcicula) was reranked as Turcicula and belongs to Trochidae'
- 'Tubastraea nomlandi belongs to Tubastraea'
- 'Turcicula arnoldi belongs to Turcicula'
- 'Turcicula columbiana belongs to Turcicula'
- 'Turcicula turbonata belongs to Turcicula'
- 'Turcicula washingtoniana belongs to Turcicula'
- 'Turricula belongs to Turridae'
- 'Turricula beanensis belongs to Turricula'
- 'Turricula bremertonensis belongs to Turricula'
- 'Turris belongs to Turridae'
- 'Turris clallamensis belongs to Turris' according to Weaver 1916
- 'Turris clallamensis is recombined as Aforia clallamensis'
- 'Turris dickersoni is recombined as Spirotropis dickersoni'
- 'Turris kincaidi belongs to Turris'
- 'Turris packardi is recombined as Aforia packardi'
- 'Turris thurstonensis is recombined as Suavodrillia thurstonensis'
- 'Turris worcesteri is recombined as Suavodrillia worcesteri'
- 'Turritella belongs to Turritellidae'
- 'Turritella blakeleyensis belongs to Turritella'
- 'Turritella diversilineata belongs to Turritella' according to Merriam 1897
- 'Turritella diversilineata belongs to Turritella'
- 'Turritella olympicensis belongs to Turritella'
- 'Turritella porterensis belongs to Turritella'
- 'Turritella wheatlandensis belongs to Turritella'
- 'Undiscala was reranked as Acrilla (Undiscala) and belongs to Acrilla'
- 'Urosalpinx belongs to Muricidae'
- 'Urosalpinx coombsi belongs to Urosalpinx'
- 'Venericardia belongs to Carditidae'
- 'Venericardia (Cyclocardia) hannibali belongs to Venericardia (Cyclocardia)'
- 'Venericardia castor belongs to Venericardia' according to Dall 1909
- 'Venericardia castor is recombined as Venericardia (Cyclocardia) castor'
- 'Venericardia hannai is recombined as Venericardia (Cyclocardia) hannai'
- 'Venus (Chione) clallamensis is recombined as Chione clallamensis'
- 'Venus (Chione) clallamensis belongs to Venus (Chione)' according to Reagan 1909
- 'Venus angustifrons belongs to Venus' according to Conrad 1849
- 'Venus angustifrons is recombined as Marcia (Mercimonia) angustifrons'
- 'Venus bisecta is recombined as Thyasira bisecta'
- 'Venus brevilineata belongs to Venus' according to Conrad 1849
- 'Venus brevilineata is recombined as Marcia (Mercimonia) angustifrons brevilineata'
- 'Volsella belongs to Mytilidae'
- 'Yoldia belongs to Nuculanidae'
- 'Yoldia (Portlandia) astoriana belongs to Yoldia (Portlandia)' according to Henderson 1920
- 'Yoldia (Portlandia) astoriana is recombined as Nuculana astoriana'
- 'Yoldia blakeleyensis belongs to Yoldia'
- 'Yoldia olympiana belongs to Yoldia'
- 'Yoldia temblorensis belongs to Yoldia'