Pitar buenavistana (FOSSIL) F. Hodson, 1927 †
Pelecyora bullata (G.B. II Sowerby, 1851)
Mercimonia bunkeri (FOSSIL) (Hanna 1927) †
Dosinia burckhardti (FOSSIL) H.F.A. von Ihering,1907 †
Chione burdigalensis (FOSSIL) (C. Mayer, 1858 †)
Leukoma burmeisteri (FOSSIL) (Borchert 1901) †
Chione burnsii (FOSSIL) W.H. Dall, 1900 †
Chione burnsii discreta (FOSSIL) Gardner, 1926 †
Egelicalva byblidis (FOSSIL) Saul & Popenoe 1992 †
Tivela byronensis (J.E. Gray, 1838)
Tivela byronensis hindsii S.C.T. Hanley, 1844
Transennella caboblanquensis N.E. Weisbord, 1964
Dosinia caelata (L.A. Reeve, 1850)
Dosinia caerulea L.A. Reeve, 1850
Periglypta caesarina (FOSSIL) (W.H. Dall, 1903 †)
Sunetta cailliaudi (FOSSIL) Dufour, 1881 †
Petricola caimitica (FOSSIL) C.J. Maury, 1917 †
Marama cainozoica (FOSSIL) (Tenison Woods 1877 †)
Pitar calcanea (FOSSIL) W.H. Dall, 1903 †
Agriopoma calceola (FOSSIL) Gardner, 1936 †
Lioconcha caledonensis M.E. Harte & K.L. Lamprell,1999
Pitar californiana (FOSSIL) (T.A. Conrad, 1835 †)
Gouldia californica W.H. Dall, 1917
Chione californiensis (W.J. Broderip, 1835)
Petricola californiensis H.A. Pilsbry & H.N. Lowe,1932
Lamelliconcha callicomata (W.H. Dall, 1902)
Globivenus callimorpha (W.H. Dall, 1902)
Circenita callipyga (I. von Born, 1778)
Gafrarium callipygum (I. von Born, 1778)
Anomalocardia callistoides (FOSSIL) H.A. Pilsbry& A.A. Olsson, 1941 †
Amiantis callosa (T.A. Conrad, 1837)
Anomalocardia caloosana (FOSSIL) (W.H. Dall, 1900 †)
Petricola calvertensis (FOSSIL) W.H. Dall, 1900 †
Pitar calvimontana (FOSSIL) G.P. Deshayes, 1857 †
Mercenaria campechiensis (J.F. Gmelin, 1791)