Cyclomactra williamsi (FOSSIL) (J. Marwick, 1948 †)
Spisula williamsi (S.S. Berry, 1960) Costa Rica, Cocos Island32 mm
Cymbophora wordeni (FOSSIL) Gardner, 1916 †
Raeta yokohamensis (FOSSIL) H.A. Pilsbry, 1895 † Japan, Chiba