Hyphantosoma crassum B.K. Raines & M. Huber,2012
Gemma cravenensis (FOSSIL) Gardner, 1943 †
Venus crebrisulca J.B.P.A. Lamarck, 1818
Puberella crenata (J.F. Gmelin, 1791)
Venus crenatula Sowerby, 1852
Irus crenatus (J.B.P.A. Lamarck, 1818)
Chionopsis crenifera (G.B. I Sowerby, 1835)
Plesiastarte crenulata (FOSSIL) (G.P. Deshayes, 1857 †)
Goshoraia crenulata (FOSSIL) (Matsumoto 1938) †
Dosinia cretacea (L.A. Reeve, 1850)
Aphrodina cretacea (FOSSIL) (T.A. Conrad, 1870 †)
Periglypta crispata (G.P. Deshayes, 1853)
Dosinia crocea G.P. Deshayes, 1853
Aphrodora crocea (G.P. Deshayes, 1854)
Circe crocea (J.E. Gray, 1838)
Tivela crowderi (FOSSIL) C.S. Weaver, 1942 †
Transennella cubaniana (A.V.M.D. D'Orbigny,1853)
Transennella culebrana (W.H. Dall & C.T. Simpson,1901)
Petricolaria cultellus (G.P. Deshayes, 1853)
Claudiconcha cumingi (G.P. Deshayes, 1853)
Dosinia cumingii (L.A. Reeve, 1850)
Irus cumingii (G.P. Deshayes, 1854)
Venerupis cumingii (G.B. II Sowerby, 1852)
Anomalocardia cuneimeris (T.A. Conrad, 1846)
Dosinia cunninghami (M. Huber, 2010)
Periglypta curionii (FOSSIL) (G.P. Deshayes, 1857 †)
Pitar curnowae K.L. Lamprell & J.M. Healy,1997
Atamarcia curta (FOSSIL) (F.W. Hutton, 1873 †)
Cyclinella cyclica (FOSSIL) (R.J.L. Guppy, 1866 †)
Nutricola cymata (W.H. Dall, 1913)
Venus cythereaeformis (FOSSIL) G.P. Deshayes, 1857 †
Petricola dactylus G.B. I Sowerby, 1823
Pitar dalikiensis (FOSSIL) Cox, 1936 †
Lirophora dalli (FOSSIL) A.A. Olsson, 1914 †
Dosinia dalli (FOSSIL) Gardner, 1947 †