Cordieria mitraeformis G.P. Deshayes, 1865
Bathytoma mitrella (W.H. Dall, 1881)
Genota mitriformis (W. Wood, 1828)
Borsonia mitromorphoides (FOSSIL) H.H. Suter, 1917 †
Ophiodermella miyatensis (M. Yokoyama, 1920)
Maoritomella moderata (FOSSIL) (J. Marwick, 1965 †)
Filodrillia mucronata C. Hedley, 1922
Maoritomella multiplex (W.H. Webster, 1906)
Bathytoma murdochi H.J. Finlay, 1930
Bathytoma neocaledonica N. Puillandre, A.V. Sysoev& al., 2010
Bathytoma netrion N. Puillandre, A.V. Sysoev& al., 2010
Asthenotoma newtoni (FOSSIL) de Boury, 1899 †
Bathytoma ngatapa (FOSSIL) (J. Marwick, 1931 †)
Genota nicklesi J. Knudsen, 1952
Borsonia nilotica (FOSSIL) Cuvillier, 1933 †
Microdrillia niponica (E.A. Smith, 1879)
Typhlodaphne nipri H. Numanami, 1996
Typhlomangelia nivalis (S.L. Lovén, 1846)
Tomopleura nivea (R.A. Philippi, 1851)
Typhlomangelia nodosolirata (FOSSIL) (H.H. Suter, 1917 †)
Cordieria nodularis (G.P. Deshayes, 1834)
Borsonia nodulosa (FOSSIL) (J.B.P.A. Lamarck,1803 †)
Bathytoma nonplicata (FOSSIL) G.F. Harris, 1937 †
Tomopleura notoensis (FOSSIL) Y. Otuka, 1935 †
Phenatoma novaezelandiae (L.A. Reeve, 1843)
Asthenotoma nysti (A.V.M.D. D'Orbigny,1847 )
Cordieria obesula (FOSSIL) G.P. Deshayes, 1865 †
Asthenotoma obliquinodosa (FOSSIL) (C.L.F. von Sandberger,1860 †)
Asthenotoma obtusangula (FOSSIL) (G.B. Brocchi, 1814 †)
Diptychophlia occata (R.B. Hinds, 1843)
Borsonia ochracea K.H.J. Thiele, 1925
Ophiodermella ogurana (FOSSIL) (M. Yokoyama, 1922 †)
Bathytoma oldhami (E.A. Smith, 1899)
Glyptaesopus oldroydi (R. Arnold, 1903)
Ophiodermella olympicensis (FOSSIL) W.O. Addicott, 1976 †