Amoria canaliculata harfordi J.C. Cox, 1869
Liopeplum canalis (FOSSIL) (T.A. Conrad, 1858 †)
Musashia cancellata (J.T. Kuroda & T. Habe,1950)
Voluta cantaurana (FOSSIL) Gibson-Smith, 1973 †
Notovoluta capricornea (B.R. Wilson, 1972)
Volutifusus caricelloides (FOSSIL) E.J. Petuch, 1988 †
Fulgoraria carnicolor (P. Bail & M. Chino,2010)
Lyria carolinensis (FOSSIL) Kellum, 1926 †
Lyria cassidula (L.A. Reeve, 1849)
Cymbiola cathcartiae L.A. Reeve, 1856
Notovoluta cathedralis (FOSSIL) (R. Tate, 1888 †)
Adelomelon caupolicani (FOSSIL) C. Nielsen& D. Frassinetti, 2007 †
Amoria chaneyi H. Morrison, 2012
Harpovoluta charcoti (É. Lamy, 1910)
Mauira chesteri (FOSSIL) (J. Marwick, 1931 †)
Fulgoraria chinoi (P. Bail, 2000)
Volutifusus choptankensis (FOSSIL) E.J. Petuch, 1988 †
Cymbiola chrysostoma (W.J. Swainson, 1824)
Voluta cincta (FOSSIL) E. Forbes, 1846 †
Athleta cithara (FOSSIL) (J.B.P.A. Lamarck,1822 †)
Voluta citharina (FOSSIL) E. Forbes, 1846 †
Volutopupa citharopsis (FOSSIL) D. Merle & al., 2014 †
Lyria citrusensis (FOSSIL) K.V.W. Palmer, 1953 †
Fulgoraria clara (G.B. III Sowerby, 1914)
Fusivoluta clarkei H.A. Rehder, 1969
Athleta clayi (FOSSIL) Smith, 1907 †
Lyria cleaveri H. Morrison, 2008
Metamelon clifdenensis (FOSSIL) (Finlay, 1926 †)
Indolyria cloveriana (C.S. Weaver, 1963)
Indolyria cloveriana gabryae (G.T. Poppe, 1991)
Teremelon cognata (FOSSIL) (Finlay, 1926 †)
Alcithoe colesae P. Bail & A. Limpus, 2005
Adelomelon colocoloi (FOSSIL) C. Nielsen& D. Frassinetti, 2007 †
Cymbiola complexa (T. Iredale, 1924)
Cymbiola complexa frazerensis P. Bail & A. Limpus, 1998