Cardium concinnum (FOSSIL) Buch, 1844 †
Trachycardium consors (I, 1833)
Protocardia contusa (FOSSIL) Healey 1908 †
Agnocardia convexa (FOSSIL) (G.P. Deshayes, 1858 †)
Ciliatocardium coosense (FOSSIL) (W.H. Dall, 1909 †)
Trigoniocardia cordeliae (FOSSIL) C.J. Maury, 1924 †
Vepricardium coronatum (J.S. Schröter, 1786)
Parvicardium cosmetum (FOSSIL) A.E.M. Cossmann, 1886 †
Agnocardia cossmanni (FOSSIL) (Vincent, 1882 †)
Protocardia costaricensis (FOSSIL) A.A. Olsson, 1922 †
Cardium costatum C. Linnaeus, 1758
Pratulum cottaldinum (FOSSIL) (d'Orbigny 1844) †
Trachycardium cotteri (FOSSIL) Cox, 1931 †
Maoricardium coxi (FOSSIL) (J. Hector, 1886 †)
Laevicardium crassum (J.F. Gmelin, 1791)
Chesacardium craticuloides (FOSSIL) (T.A. Conrad, 1845 †)
Dinocardium credelarum (FOSSIL) (L.R. Cox, 1941 †)
Onestia crespinae (FOSSIL) Day 1978 †
Papyridea crockeri (A.M. Strong& L.G. Hertlein, 1937)
Acanthocardia ctenolium (FOSSIL) W.H. Dall, 1900 †
Cardium cuculloides (FOSSIL) R. Tate, 1886 †
Lophocardium cumingii (W.J. Broderip, 1834)
Acrosterigma cygnorum (G.P. Deshayes, 1855)
Nemocardium cyprium (FOSSIL) (G.B. Brocchi, 1814 †)
Cardium dalli (FOSSIL) R.E. Dickerson, 1913 †
Cardium dalli (FOSSIL) A. Heilprin, 1887 †
Cardium dariesi (FOSSIL) A. Dey, 1961 †
Trigoniocardia deadenense (FOSSIL) (Mansfield 1932) †
Laevicardium decorticatum (FOSSIL) Wood, 1840 †
Afrocardium defrancii (FOSSIL) (G.P. Deshayes, 1858 †)
Cardium degrangei (FOSSIL) A.E.M. Cossmann, 1895 †
Acrosterigma delectabile (FOSSIL) (P.A. Maxwell, 1978 †)
Trachycardium delicatum (E.A. Smith, 1915)
Rudicardium denticostulatum (FOSSIL) (Beets 1941) †
Austrocardium denticulatum (FOSSIL) (Baily 1855) †