Tapes clandestinus (FOSSIL) C. Mayer, 1860 †
Lamelliconcha clarki (FOSSIL) R.E. Dickerson, 1917 †
Lirophora clenchi (T.E. Pulley, 1952)
Venus cleryana (FOSSIL) d'Orbigny, 1842 †
Timoclea cochinensis (G.B. II Sowerby, 1853)
Tawera coelata (K.T. Menke, 1843)
Chione cognata (FOSSIL) G.B. Pritchard, 1903 †
Petricolaria cognata (C.B. Adams, 1852)
Tivelina coislinensis (FOSSIL) A.E.M. Cossmann, 1907 †
Transennella cola (FOSSIL) W.P. Woodring, 1982 †
Pitar colchaguana (FOSSIL) (L.H. Hupé, 1854 †)
Agriopoma colombiana (FOSSIL) Clark & J.W. Durham,1946 †
Dosinia coloradoensis (FOSSIL) Rivera, 1957 †
Leukoma columbiensis (Sowerby, 1835)
Textivenus complanatus (FOSSIL) (J.L.M. Defrance, 1828 †)
Tivela compressa (G.B. II Sowerby, 1851)
Chione compta (W.J. Broderip, 1835)
Dosinia concentrica (I. von Born, 1778)
Timoclea concinna (J.M.R.M. Viader, 1951)
Petricola concinna (FOSSIL) G.B. I Sowerby, 1834 †
Lamelliconcha concinna (G.B. I Sowerby, 1835)
Sunetta concinna R.W. Dunker, 1865
Petricoxenica concoralla (FOSSIL) E.H. Vokes, 1976 †
Venus conformis (FOSSIL) G.P. Deshayes, 1857 †
Nutricola confusa (S. Gray, 1982)
Dosinia conglobata A. Römer, 1862
Cytheriopsis conradi (FOSSIL) Clark & J.W. Durham,1946 †
Pitar conradi (FOSSIL) R.E. Dickerson, 1916 †
Costacallista conradiana (FOSSIL) (W.M. Gabb, 1864 †)
Transennella conradina W.H. Dall, 1884
Pitar consanguineus (C.B. Adams, 1852)
Pitar consanguineus elenensis A.A. Olsson, 1961
Saxidomus conspectus (FOSSIL) L. Krishtofovich, 1969 †
Tapes conspersus (J.F. Gmelin, 1791)
Tapes conspersus adspersa A. Römer, 1870