Barbatia (Acar) reinharti Effinger, 1938 † (original description)
Cirsochilus washingtonianus Effinger, 1938 † (original description)
Cylichnina turneri Effinger, 1938 † (original description)
Cypraeogemmula warnerae Effinger, 1938 † (original description)
Glycymeris winlockensis Effinger, 1938 † (original description)
Liotia weaveri Effinger, 1938 † (original description)
Loxocardium etheringtoni Effinger, 1938 † (original description)
Molopophorus Gabb, 1869 † (basis of record)
Molopophorus bramkampi Effinger, 1938 † (original description)
Mya (Antiguamya) Effinger, 1938 † (original description)
Odostomia (Odostomia) winlockiana Effinger, 1938 † (original description)
Odostomia griesensis Effinger, 1938 † (original description)
Ostrea griesensis Effinger, 1938 † (original description)
Pedalion clarki Effinger, 1938 † (original description)
Scaphander washingtonensis C. E. Weaver, 1916 † (basis of record)
Scaphander washingtonensis goodspeedi Effinger, 1938 † (original description)
Spirotropis (Spirotropis) G. O. Sars, 1878 accepted as Spirotropis G. O. Sars, 1878 (basis of record)
Spirotropis (Spirotropis) winlockensis Effinger, 1938 † (original description)
Taras griesensis Effinger, 1938 † (original description)
Tellina gibsonensis K. van W. Palmer, 1918 † (additional source)
Trichotropis alienensis Effinger, 1938 † (original description)
Turbella cowlitzensis Effinger, 1938 † (original description)
Volvulella tabori Effinger, 1938 † (original description)

Washington for Barbatia (Acar) reinharti Effinger, 1938 † 
Washington for Cirsochilus washingtonianus Effinger, 1938 † 
Washington for Cylichnina turneri Effinger, 1938 † 
Washington for Cypraeogemmula warnerae Effinger, 1938 † 
Washington for Glycymeris winlockensis Effinger, 1938 † 
Washington for Liotia weaveri Effinger, 1938 † 
Washington for Loxocardium etheringtoni Effinger, 1938 † 
Washington for Molopophorus bramkampi Effinger, 1938 † 
Washington for Odostomia (Odostomia) winlockiana Effinger, 1938 † 
Washington for Odostomia griesensis Effinger, 1938 † 
Washington for Ostrea griesensis Effinger, 1938 † 
Washington for Pedalion clarki Effinger, 1938 † 
Washington for Scaphander washingtonensis goodspeedi Effinger, 1938 † 
Washington for Spirotropis (Spirotropis) winlockensis Effinger, 1938 † 
Washington for Taras griesensis Effinger, 1938 † 
Washington for Trichotropis alienensis Effinger, 1938 † 
Washington for Turbella cowlitzensis Effinger, 1938 † 
Washington for Volvulella tabori Effinger, 1938 †