Opinions from W. O. Addicott 1973
- 'Acila muta is recombined as Acila (Truncacila) muta'
- 'Acila muta markleyensis is an invalid subgroup of Acila (Truncacila) muta'
- 'Antigona (Artena) neglecta is a subjective synonym of Amiantis mathewsoni'
- 'Apolymetis twinensis is a subjective synonym of Heteromacoma rostellata'
- 'Apolymetis vancouverensis belongs to Apolymetis' according to Weaver 1942
- 'Apolymetis vancouverensis is a subjective synonym of Heteromacoma rostellata'
- 'Arca (Scapharca) submontereyana is recombined as Anadara (Anadara) submontereyana'
- 'Arca (Scapharca) submontereyana is recombined as Anadara submontereyana' according to Addicott 1972
- 'Bruclarkia seattlensis belongs to Bruclarkia'
- 'Calyptraea washingtonensis is a subjective synonym of Calyptraea diegoana'
- 'Chione mathewsonii is recombined as Amiantis mathewsoni'
- 'Chione whitneyi is recombined as Dosinia (Dosinia) whitneyi'
- 'Chione whitneyi is recombined as Dosinia whitneyi' according to Addicott 1972
- 'Crepidula ungana belongs to Crepidula' according to Dall 1908
- 'Crepidula ungana belongs to Crepidula'
- 'Cyclas permacra belongs to Cyclas' according to Conrad 1857
- 'Cyclas permacra is a subjective synonym of Lucinoma acutilineata'
- 'Dentalium (Fissidentalium) laneensis is recombined as Dentalium laneensis'
- 'Diplodonta harfordi is recombined as Felaniella harfordi'
- 'Dosinia mathewsonii is a subjective synonym of Dosinia (Dosinia) whitneyi'
- 'Dosinia pertenuis is recombined as Clementia pertenuis' according to Schenck and Keen 1940
- 'Dosinia pertenuis is recombined as Clementia (Egesta) pertenuis'
- 'Galerus excentricus is a subjective synonym of Calyptraea diegoana'
- 'Heteromacoma belongs to Tellinidae'
- 'Yoldia (Portlandia) oregona is a subjective synonym of Yoldia (Kalayoldia) tenuissima'
- 'Lucina acutilineata is recombined as Phacoides acutilineata' according to Dall 1909
- 'Lucina acutilineata is recombined as Phacoides acutilineatus' according to Arnold and Anderson 1910
- 'Lucina acutilineata is recombined as Lucinoma acutilineata'
- 'Lucina excavata is recombined as Here excavata'
- 'Macoma piercei is recombined as Tellina (Olcesia) piercei'
- 'Macoma sespeensis is a subjective synonym of Heteromacoma rostellata'
- 'Metis rostellata is recombined as Heteromacoma rostellata'
- 'Metis sespeensis is a subjective synonym of Heteromacoma rostellata'
- 'Metis vancouverensis is a subjective synonym of Heteromacoma rostellata'
- 'Mytilus arnoldi is recombined as Crenomytilus arnoldi'
- 'Mytilus mathewsoni expansus is recombined as Crenomytilus expansus'
- 'Mytilus mathewsonii is recombined as Crenomytilus mathewsoni'
- 'Neverita (Glossaulax) thomsonae belongs to Neverita (Glossaulax)'
- 'Ostrea eldridgei is recombined as Crassostrea eldridgei'
- 'Panope ramonensis is recombined as Panopea (Panopea) ramonensis' according to Hickman 1969
- 'Panope ramonensis belongs to Panope' according to Clark 1925
- 'Panope ramonensis is recombined as Panopea ramonensis'
- 'Panopea (Panopea) belongs to Panopea'
- 'Panopea (Panopea) belongs to Panopea' according to Menard 1807
- 'Pecten (Pecten) dickersoni is a subjective synonym of Pecten (Pecten) sanctaecruzensis'
- 'Pecten (Pecten) sanctaecruzensis belongs to Pecten (Pecten)'
- 'Pectunculus patulus belongs to Pectunculus' according to Conrad 1849
- 'Pectunculus patulus is a subjective synonym of Lucinoma acutilineata'
- 'Phacoides (Miltha) sanctaecrucis is recombined as Miltha sanctaecrucis' according to Stewart 1947
- 'Phacoides (Miltha) sanctaecrucis is recombined as Miltha (Miltha) sanctaecrucis'
- 'Poromya teglandae is a subjective synonym of Heteromacoma rostellata'
- 'Searlesia branneri is recombined as Calicantharus branneri'
- 'Searlesia dalli is recombined as Calicantharus dalli'
- 'Solen gravidus belongs to Solen'
- 'Spisula albaria ramonensis is recombined as Spisula ramonensis' according to Clark 1918
- 'Spisula albaria ramonensis is recombined as Spisula ramonensis'
- 'Spisula rushi belongs to Spisula'
- 'Tellina (Olcesia) belongs to Tellina'
- 'Tellina arctata belongs to Tellina' according to Conrad 1849
- 'Tellina arctata is recombined as Macoma arctata'
- 'Tellina clallamensis is a subjective synonym of Tellina (Oudardia) emacerata'
- 'Tellina emacerata is recombined as Tellina (Oudardia) emacerata'
- 'Macoma nasuta is a subjective synonym of Tellina (Olcesia) piercei'
- 'Tellina nevadensis is a subjective synonym of Tellina (Olcesia) piercei'
- 'Tellina ocoyana is a subjective synonym of Tellina (Olcesia) piercei'
- 'Tellina oregonensis is a subjective synonym of Tellina (Oudardia) emacerata'
- 'Tellina tenuilineata is recombined as Tellina (Tellinella) tenuilineata'
- 'Tellina townsendensis belongs to Tellina' according to Clark 1925
- 'Tellina townsendensis belongs to Tellina'
- 'Tellina vancouverensis belongs to Tellina'
- 'Trochita diegoana is recombined as Calyptraea diegoana'
- 'Vertipecten alexclarki belongs to Vertipecten'
- 'Yoldia cooperi tenuissima is recombined as Yoldia cooperii tenuissima' according to Clark 1918
- 'Yoldia cooperi tenuissima is recombined as Yoldia (Kalayoldia) tenuissima'