Oenopota mitrula (S.L. Lovén, 1846)
Anticlinura monochorda (W.H. Dall, 1908)
Eucithara monochoria C. Hedley, 1922
Saccharoturris monocingulata (W.H. Dall, 1889)
Propebela monterealis (W.H. Dall, 1919)
Eucithara moraria C. Hedley, 1922
Oenopota morchi (W. Leche, 1878)
Antiguraleus morgana (K.H. Barnard, 1958)
Neoguraleus morgani (FOSSIL) (J. Marwick, 1924 †)
Sorgenfreispira moronii (FOSSIL) (Venzo & Pelosio, 1964 †)
Anticlinura movilla (W.H. Dall, 1908)
Mangelia muiri K.H. Barnard, 1958
Brachycythara multicincta E. Rolán & J. Espinosa,1999
Oenopota multicostata (T.A. Verkrüzen, 1878)
Vitjazinella multicostata A.V. Sysoev, 1988
Pseudorhaphitoma multigranosa (M.M. Schepman, 1913)
Tenaturris multilineata (C.B. Adams, 1845)
Mangelia multilineolata (G.P. Deshayes, 1835)
Antiguraleus multistriatus R.K. Dell, 1956
Mangelia munda (E.A. Smith, 1888)
Antiguraleus mundus (H.H. Suter, 1909)
Mangelia munivakensis W.H. Dall, 1919
Neoguraleus murdochi (H.J. Finlay, 1924)
Oenopota murdochiana (W.H. Dall, 1885)
Ithycythara muricoides (C.B. Adams, 1850)
Antiguraleus murrheus (W.H. Webster, 1906)
Leiocithara musae (K.H.J. Thiele, 1925)
Mangelia myrmecodes J.C. Melvill & R. Standen,1901
Pseudorhaphitoma naganumaensis Y. Otuka, 1935
Pseudorhaphitoma nakosiensis (FOSSIL) S. Nomura & N. Zinbo,1936 †
Eucithara nana (L.A. Reeve, 1846)
Brachycythara nanodes (J.C. Melvill, 1923)
Guraleus nanus C.F. Laseron, 1954
Bela nassoides J. Gardner, 1938
Mangelia neapolitana S. Delle Chiaje, 1841