Pseudoaluco clarki (FOSSIL) K.V.W. Palmer, 1953 †
Pseudovertagus clava (J.F. Gmelin, 1791)
Cerithium claviforme M.M. Schepman, 1907
Fastigiella climacina (FOSSIL) A.E.M. Cossmann & G. Pissarro †,
Cerithium clypeus (FOSSIL) W.H. Hudleston, 1889 †
Bittium coislinense (FOSSIL) A.E.M. Cossmann, 1897 †
Cerithium coloradense (FOSSIL) Stanton, 1947 †
Cerithium columna G.B. I Sowerby, 1834
Cerithium columna fusiforme G.B. II Sowerby, 1855
Cerithium columna sandwichensis L.A. Reeve, 1865
Cerithium columna sculptum W.H. Pease, 1869
Cerithium commaoides (FOSSIL) W.H. Hudleston, 1889 †
Cerithium confusum (FOSSIL) Tate, 1875 †
Texmelanatria contracta (FOSSIL) Garvie, 2013 †
Cerithium coralium (L.C. Kiener, 1841)
Clypeomorus coralius (Dufresne, 1842)
Cerithium coronatum (FOSSIL) Moore †
Rhinoclavis corpulens (FOSSIL) A.E.M. Cossmann& M.A. Peyrot, 1922 †
Cerithium corvinum (FOSSIL) (A. Brongniart, 1862 †)
Serratocerithium cossmanni (FOSSIL) R. Charpiat, 1919 †
Hemicerithium cossmanni (FOSSIL) (W.H. Dall, 1892 †)
Rhinoclavis costaricana (FOSSIL) A.A. Olsson, 1922 †
Cerithium costaricensis (FOSSIL) A.A. Olsson, 1922 †
Cerithium costulatum (FOSSIL) J.B.P.A. Lamarck, 1889 †
Bittium courtillerianum (FOSSIL) (Millet, 1865) †
Exechocirsus cowickeensis (FOSSIL) N.F. Sohl, 1964 †
Colina coxi (FOSSIL) Abbass, 1967 †
Bittium crassicostatum (FOSSIL) (Etheridge & Bell,1898) †
Tenuicerithium crassicostatum (FOSSIL) (G.P. Deshayes, 1864 †)
Cerithium crassilabrum C.F.F. von Krauss, 1848
Hemicerithium craticulum (FOSSIL) R.C. Hoerle, 1972 †
Cerithium crenatum (FOSSIL) G.B. Brocchi, 1814 †
Cerithium crenatum procrenatum (FOSSIL) F. Sacco, 1895 †
Cerithium crenulatum (FOSSIL) G.P. Deshayes †
Cerithium cribaroyes (FOSSIL) Author unknown †