Andonia chaussyensis (FOSSIL) (A.E.M. Cossmann, 1889 †)
Coronia childreni (FOSSIL) (Lea, 1833 †)
Ptychosyrinx chilensis S.S. Berry, 1968
Chesaclava choptankensis (FOSSIL) (Martin, 1904 †)
Euryentmema cigclis (FOSSIL) W.P. Woodring, 1928 †
Turridrupa cincta (J.B.P.A. Lamarck, 1822)
Iotyrris cingulifera (J.B.P.A. Lamarck, 1822)
Iotyrris cingulifera flammulata (J.L. Bouge& P. Dautzenberg, 1914)
Pleurofusia clarkeana (FOSSIL) (T.H. Aldrich, 1894 †)
Turris clausifossata R.N. Kilburn, A.E. Fedosov& B.M. Olivera, 2012
Turris cleopatrae (FOSSIL) Abbass, 1967 †
Gemmula clifdenensis (FOSSIL) A.W.B. Powell, 1942 †
Gemmula closterion A.V. Sysoev, 1997
Pleurotoma clymene W.H. Dall, 1918
Pleuroliria cochlearis (FOSSIL) (T.A. Conrad, 1848 †)
Polystira coltrorum E.J. Petuch, 1993
Eopleurotoma comma (FOSSIL) (F.E. Edwards, 1861 †)
Hemipleurotoma communis (FOSSIL) (T.A. Conrad, 1830 †)
Turris concava (FOSSIL) G.F. Harris, 1897 †
Gemmula concinna (R.W. Dunker, 1871)
Turris condei J.L. Vera-Peláez, R. Vega-Luz& M.C. Lozano, 2000
Gemmula congener (E.A. Smith, 1894)
Gemmula congener unilineata A.W.B. Powell, 1967
Unedogemmula contigua (FOSSIL) (G.B. Brocchi, 1814 †)
Cryptogemma cornea (T.A. Okutani, 1966)
Mariadrillia cornelliana (FOSSIL) (Martin, 1904 †)
Gemmula coronata (FOSSIL) (Münster, 1844 †)
Gemmula coronata (FOSSIL) (Münster in Goldf,1843 †)
Turris coronata (FOSSIL) (Münster in Goldf,1843 †)
Pleurotoma coronifer (FOSSIL) Martin, 1879 †
Turris cosmanni (FOSSIL) M.A. Peyrot, 1931 †
Gemmula cosmoi (E.R. Sykes, 1930)
Amuletum costatum (FOSSIL) N.F. Sohl, 1964 †
Eopleurotoma crassilinea (FOSSIL) (F.E. Edwards, 1861 †)
Pleurofusia crassinoda (FOSSIL) (C. des Moulins, 1842 †)