Cerithium nesioticum H.A. Pilsbry & E.G. Vanatta,1906
Cerithium nicaraguense H.A. Pilsbry & H.N. Lowe,1932
Bittium nicholsi P. Bartsch, 1911
Colina nieulandei (FOSSIL) Renard, 1994 †
Ittibittium nipponkaiense (T. Habe & O. Masuda,1990)
Cerithium nipporiensis (FOSSIL) S. Tokunaga, 1906 †
Bittium nitens P.P. Carpenter, 1864
Cerithium nivosum G.B. II Sowerby, 1855
Pseudovertagus nobilis (L.A. Reeve, 1855)
Cerithium nodoliratum (FOSSIL) B. Wade, 1926 †
Cerithium nodulosum J.G. Bruguière, 1792
Cerithium nodulosum adansonii J.G. Bruguière, 1792
Cerithium nodulosum erythraeonense J.B.P.A. Lamarck, 1822
Rhinoclavis noetlingi (FOSSIL) Martin, 1889 †
Cerithium novaehollandiae Adams, 1855
Bittium nugatorium (FOSSIL) J. Brown & H.A. Pilsbry,1911 †
Jetwoodsia nullarborica (FOSSIL) (R. Tate, 1879 †)
Clypeomorus nympha R.S. Houbrick, 1985
Cerithium obesum (FOSSIL) R.J.L. Guppy, 1876 †
Cerithium obliquistoma (FOSSIL) G. Seguenza, 1879 †
Cerithium obliquistoma mayeri P. Doderlein, 1862
Cerithium obliteratogranosum (FOSSIL) F.A. Roemer, 1888 †
Cerithium obornense (FOSSIL) W.H. Hudleston, 1889 †
Alabina occidentalis (H. Hemphill, 1894)
Cerithium ocirrhoe (FOSSIL) Orbigny, 1852 †
Bittium oedumi (FOSSIL) Schnetler, 2001 †
Lirobittium oldroydae (P. Bartsch, 1911)
Rhinoclavis oligoasper (FOSSIL) F. Sacco, 1895 †
Tenuicerithium omanicum (FOSSIL) M. Harzhauser, 2007 †
Bittium oosimense (R.B. Watson, 1886)
Cerithium ophioderma (T. Habe, 1968)
Rhinoclavis orditus (FOSSIL) O.G. Michelotti, 1861 †
Bittium ornatissimum P. Bartsch, 1911
Ittibittium oryza (O.A.L. Mörch, 1876)
Cerithium oscitans G.B. II Sowerby, 1855