Dentimargo claroi J. Espinosa & J.A. Ortea,2004
Marginella cleryi S.A.A. Petit De La Saussaye,1836
Volvarina clima (FOSSIL) (B.C. Cotton, 1949 †)
Marginella cloveri E. de C. Rios& H.R. Matthews, 1972
Cryptospira cloveriana A. Wakefield, 2010
Eratoidea cochensis T. McCleery, 2011
Prunum colinensis (FOSSIL) F. Hodson, 1927 †
Volvarina collina (FOSSIL) A.A. Olsson, 1922 †
Serrata coloba (FOSSIL) J. Gardner, 1937 †
Serrata coloba conoispira (FOSSIL) J. Gardner, 1937 †
Marginella colombi T. Cossignani, 2012
Marginella colomborum (L. Bozzetti, 1995)
Granulina colonensis T. McCleery, 2010
Prunum coltrorum T. Cossignani, 2005
Volvarina columba J. Espinosa, L. Moro& J.A. Ortea, 2011
Dentimargo columbellina (FOSSIL) (G.P. Deshayes, 1865 †)
Hydroginella columnaria (C. Hedley & W.L. May,1908)
Volvarina compressa (L.A. Reeve, 1865)
Prunum conchibellum J. Espinosa, J.A. Ortea& L. Moro, 2010
Volvarina confitesensis J. Espinosa, J.A. Ortea& L. Moro, 2010
Protoginella conica (FOSSIL) (G.F. Harris, 1897 †)
Prunum coniforme (FOSSIL) (Sowerby, 1850 †)
Mesoginella consobrina (W.L. May, 1911)
Dentimargo contabulata (FOSSIL) (G.P. Deshayes, 1865 †)
Prunum contractum (FOSSIL) (T.A. Conrad, 1868 †)
Eratoidea copiosa T. McCleery, 2011
Volvarina corallina (A.R.J.B. Bavay, 1910)
Marginella cordiformis (FOSSIL) Bose, 1906 †
Volvarina cordyorum T. Cossignani, 2009
Serrata coriolis F. Boyer, 2008
Serrata cornelliana (FOSSIL) C.J. Maury, 1910 †
Volvarina corusca (L.A. Reeve, 1865)
Marginella cosmia P. Bartsch, 1915
Serrata cossignanorum L. Bozzetti, 1997
Volvarina cossmanni (FOSSIL) M.A. Peyrot, 1928 †