Nassarius concinnus (W.L. Powys, 1835)
Demoulia conglobata (FOSSIL) (G.B. Brocchi, 1814 †)
Nassarius congruus (FOSSIL) (M. Yokoyama, 1926 †)
Nassarius conoidalis (G.P. Deshayes, 1832)
Nassarius consensus E. Ravenel, 1861
Tritia consociata (FOSSIL) (Wood, 1848 †)
Tritia conspersa (R.A. Philippi, 1849)
Nassarius coppingeri (E.A. Smith, 1881)
Nassarius coralligenus (P.M. Pallary, 1900)
Ilyanassa corbis (FOSSIL) A.A. Olsson, 1967 †
Nassarius coriolis H.H. Kool, 2009
Nassaria cornelliana (FOSSIL) A.A. Olsson, 1914 †
Nassarius cornellianus (FOSSIL) A.A. Olsson, 1916 †
Tritia corniculum (A.G. Olivi, 1792)
Tritia corniculum fasciolatus Y. Hirase, 1936
Tritia corniculum flava (F.P. Marrat, 1877)
Nassaria corollaria K. Fraussen, 2006
Nassaria coromandelica E.A. Smith, 1894
Nassarius coronatus (J.G. Bruguière, 1789)
Nassarius coronulus (A. Adams, 1852)
Nassarius corrugatus (FOSSIL) (G.B. Brocchi, 1814 †)
Hebra corticata (A. Adams, 1852)
Hebra corticata lirata (F.P. Marrat, 1874)
Pallacera costata (FOSSIL) (W.M. Gabb, 1873 †)
Nassarius crassigranosus (FOSSIL) (R. Tate, 1888 †)
Nassaria crassiuscula (FOSSIL) (L.M.D. Bellardi, 1882 †)
Phos crassus R.B. Hinds, 1843
Phos crassus clarki (M. Smith, 1944)
Nassarius crebresulcatus (FOSSIL) (L.M.D. Bellardi, 1882 †)
Nassarius crebricostatus (M.M. Schepman, 1911)
Nassarius crebricostulatus (FOSSIL) (L.M.D. Bellardi, 1882 †)
Nassarius crematus R.B. Hinds, 1844
Nassarius crenoliratus (A. Adams, 1852)
Nassarius crenulatus (J.G. Bruguière, 1792)
Reticunassa crenulicostata (T. Shuto, 1969)