Gerdiella cingulata (A.A. Olsson & F.M. Bayer,1972)
Neadmete circumcincta (W.H. Dall, 1873)
Plesiotriton clandestinus J.M. Pacaud,Ledon & Loubry, 2015
Perplicaria clarki Smith, 1947
Narona clavatula (Sowerby, 1832)
Brocchinia clenchi R.E. Petit, 1986
Admete clivicola T. Høisæter, 2011
Ventrilia coatesi (FOSSIL) B.M. Landau, R.E. Petit& F. Da Silva, 2012 †
Cancellaria coctilis L.A. Reeve, 1856
Euclia codazzii (FOSSIL) F.M. Anderson, 1929 †
Narona coensis (FOSSIL) W.C. Mansfield, 1930 †
Egerea collectiva (FOSSIL) Gábor, 1936 †
Sveltia colpodes (FOSSIL) A.E.M. Cossmann, 1899 †
Cancellaria coltrorum M.G. Harasewych& R.E. Petit, 2014
Cancellaria cominella (FOSSIL) H.A. Pilsbry& A.A. Olsson, 1941 †
Zeadmete concava (FOSSIL) (J. Marwick, 1931 †)
Sveltia confusa (FOSSIL) Brunetti, 2016 †
Nothoadmete consobrina (A.W.B. Powell, 1951)
Admete contabulata H.B.S. Friele, 1879
Scalptia contabulata (G.B. I Sowerby, 1832)
Cancellaria contorta (FOSSIL) (B. de Basterot, 1825 †)
Cancellaria contorta gelriana (FOSSIL) A.W. Janssen, 1972 †
Cancellaria cooperii W.M. Gabb, 1865
Gerdiella corbicula (W.H. Dall, 1908)
Marianarona corbula (FOSSIL) (T.A. Conrad, 1843 †)
Admetula cornidei (C. Altimira, 1978)
Cancellaria coronadoensis (FOSSIL) J.W. Durham, 1950 †
Tribia coronata (A. Scacchi, 1835)
Massyla corpulenta (FOSSIL) B.M. Landau & al., 2012 †
Cancellaria corrosa L.A. Reeve, 1856
Massyla corrugata (R.B. Hinds, 1843)
Cancellaria cossmanni (FOSSIL) L.J. Morlet, 1888 †
Cancellaria costellifera (FOSSIL) Sowerby, 1818 †
Trigonostoma costiferum (G.B. I Sowerby, 1832)
Unitas costulata (FOSSIL) (J.B.P.A. Lamarck,1803 †)