Austrofusus cottoni (FOSSIL) L. C. King, 1933 †
Eocantharus cowliztensis (FOSSIL) B.L. Clark, 1938 †
Serratifusus craspedotus (FOSSIL) (R. Tate, 1888 †)
Buccinopsis crassa (FOSSIL) B. Wade, 1917 †
Buccinopsis crassicostata (FOSSIL) W.M. Gabb, 1876 †
Prosipho crassicostatus (J.C. Melvill & R. Standen,1907)
Cominella crassina (FOSSIL) R. Tate, 1888 †
Cominella crassinodosa (FOSSIL) J. Marwick, 1931 †
Chauvetia crassior (N.H. Odhner, 1932)
Cantharus crassisculptus (A.H.E. Beyrich, 1856 )
Penion crassus (FOSSIL) D. Frassinetti, 2000 †
Chauvetia craticulata (O.A.L. Mörch, 1860)
Penion crawfordi (FOSSIL) (F.W. Hutton, 1873 †)
Penion crawfordi?? (F.W. Hutton, 1873)
Buccinum crebricarinatum V.J. Lus, 1978
Buccinum crebricostatum V.J. Lus, 1978
Beringius crebricostatus (W.H. Dall, 1877)
Monostiolum crebristriatus (H.F. Carpenter, 1856)
Buccinum crenatum A.N. Golikov & V.V. Gulbin,1977
Pollia crenulata (P.F. Röding, 1798)
Gemophos crispatus (FOSSIL) G.J. Vermeij, 2006 †
Buccinum cristatum A.N. Golikov & B.I. Sirenko,1988
Plicifusus croceus (W.H. Dall, 1907)
Engina cronuchorda K. Fraussen & M. Chino,2011
Costaria crosnieri P. Bouchet & A. Warén,1986
Metula crosnieri P. Bouchet, 1988
Cantharus cumberlandianus (FOSSIL) W.M. Gabb, 1860 †
Metula cumingi A. Adams, 1853
Engina cumingiana J.C. Melvill, 1895
Neptunea cumingii J.C.H. Crosse, 1862
Afer cumingii (L.A. Reeve, 1847)
Euthria cumulata K. Fraussen & R. Hadorn,2003
Engina curtisiana (E.A. Smith, 1884)
Colus curtus (FOSSIL) (J.G. Jeffreys, 1867 †)
Neptunea cuspidis K. Fraussen & Y. Terryn,2007