Conuber incei (R.A. Philippi, 1853)
Natica incerta P.F. Röding, 1798
Polinella incerta (FOSSIL) (J. Marwick, 1924 †)
Sinum incisum (L.A. Reeve, 1864)
Sinum ineptum (FOSSIL) M. Yokoyama, 1924 †
Natica inexpectans A.A. Olsson, 1971
Tanea inexpectata (FOSSIL) (Finlay, 1924 †)
Cochlis infelix (FOSSIL) (F. Sacco, 1890 †)
Sinum infirmum (FOSSIL) J. Marwick, 1924 †
Eunaticina inflata (J.J. Tesch, 1920)
Sigatica infundibulum (FOSSIL) (A. Watelet, 1853 †)
Eunaticina insculpta (FOSSIL) (Carpenter, 1865 †)
Natica insecta F.P. Jousseaume, 1874
Notocochlis insularum (R.B. Watson, 1886)
Polinices intemeratus R.A. Philippi, 1851
Gennaeosinum intercisum (T. Iredale, 1931)
Taniella intermedia (FOSSIL) P.A. Maxwell, 1992 †
Polinices intermeratus (FOSSIL) R.A. Philippi, 1851 †
Euspira interna (FOSSIL) (T. Say, 1824 †)
Polinices intracrassus (FOSSIL) Finlay, 1924 †
Euspira intricata (E. Donovan, 1804)
Euspira intricata similis (T.A. de M. Monterosato,1884)
Natica inutilis P.F. Röding, 1798
Notocochlis isabelleana (A.V.M.D. D'Orbigny,1840)
Amauropsis islandica (J.F. Gmelin, 1791)
Sinum jacksonense (FOSSIL) †
Euspira jacksonensis (FOSSIL) †
Neverita jamesae (FOSSIL) E.W.J. Moore, 1963 †
Cryptonatica janthostoma (G.P. Deshayes, 1839)
Cryptonatica janthostomoides (J.T. Kuroda & T. Habe,1949)
Amauropsis japonica (Adams, 1839)
Sinum japonicum (C.E. Lischke, 1872)
Sinum javanicum (J.E. Gray, 1834)
Sinum javanus (FOSSIL) E. Griffith & E. Pidgeon,1834 †
Polinices jorgensis (FOSSIL) H.F.A. von Ihering,1907 †