Clypeastericola clypeastericola (T. Habe, 1976)
Vitreolina colini J. Espinosa & J.A. Ortea,2006
Melanella collator (FOSSIL) (C.R. Laws, 1944 †)
Crinophtheiros collinsi (E.R. Sykes, 1903)
Hypermastus colmani A. Warén, 1991
Vitreolina columbiana (P. Bartsch, 1917)
Hebeulima columnaria (W.L. May, 1916)
Crinophtheiros comatulicola (L.von Graff, 1875)
Vitreolina commensalis (R. Tate, 1898)
Eulima communis T.A. Verkrüzen, 1887
Amamibalcis comoxensis (P. Bartsch, 1917)
Eulima compacta P.P. Carpenter, 1864
Melanella compactilis (É.A.A. Locard, 1892)
Eulima compressiuscula A. Garrett
Eulima compsa A.E. Verrill & K.J. Bush,1900
Eulima conaminis C. Hedley, 1909
Stilifer concavus A. Warén, 1980
Siphonophyla concentrica (FOSSIL) (Münster, 1841 †)
Balcis conchita (FOSSIL) A.M. Keen, 1943 †
Oceanida confluens P. Bouchet & A. Warén,1986
Eulima confusa P. Bouchet & A. Warén,1986
Eulima conica T.A. Verkrüzen, 1887
Vitreolina conica (C.B. Adams, 1850)
Scalenostoma conicum (FOSSIL) B.M. Landau, F. Da Silva& S.M. Heitz, 2016 †
Melanella conoidea (Kurtz & W. Stimpson,1851)
Amamibalcis conspicuus (A.N. Golikov, 1985)
Hemiliostraca conspurcata (C.B. Adams, 1864)
Sticteulima constellata (J.C. Melvill, 1898)
Niso constricta (FOSSIL) G.P. Deshayes, 1866 †
Melanella convexa (E.A. Smith, 1907)
Stilapex cookeanus (P. Bartsch, 1917)
Oceanida corallina (C. Hedley, 1912)
Melanella corintonis (L.G. Hertlein& A.M. Strong, 1951)
Curveulima cornuta C.F. Laseron, 1955
Melanella cosmia (P. Bartsch, 1917)