Engina mirabilis K. Fraussen& P. Stahlschmidt, 2015
Buccinum mirandum E.A. Smith, 1875
Buccinum mirandum picturatum W.H. Dall, 1877
Searlesia mitgaui (FOSSIL) (A. von Koenen, 1867 †)
Metula mitraeformis (FOSSIL) (G.B. Brocchi, 1814 †)
Metula mitreolus (FOSSIL) (J.P.S. Grateloup,1833 †)
Ancistrolepis mitsuchii (FOSSIL) (K. Kanehara †)
Buccinum miyauchii M. Azuma, 1972
Buccinum mizutanii T. Habe & K. Itô, 1970
Micrologus mochatinctus K. Fraussen & J. Rosado,2011
Neptunea modesta (FOSSIL) (Kuroda †)
Thalassoplanes modesta (E.C. Von Martens, 1885)
Buccinum modestum W.L. Powys, 1835
Siphonalia modificata (L.A. Reeve, 1846)
Turrisipho moebii (R.W. Dunker & A. Metzger,1874)
Thalassoplanes moerchii (W.H. Dall, 1908)
Ancistrolepis mogamiense (FOSSIL) (S. Nomura & N. Zinbo,1941 †)
Mohnia mohni (H.B.S. Friele, 1877)
Engina moinensis (FOSSIL) B.M. Landau& G.J. Vermeij, 2012 †
Phaenomenella mokenorum K. Fraussen, 2008
Pollia mollis (A.A. Gould, 1860)
Pollia mondolonii K. Fraussen, 2012
Searlesia monensis (FOSSIL) F.W. Harmer, 1914 †
Enigmaticolus monnieri K. Fraussen, 2008
Cavineptunea monstrosa A.W.B. Powell, 1951
Buccinum morchi H.B.S. Friele, 1877
Buccinum morchianum R.W. Dunker, 1858
Buccinum morchianum inclytum H.A. Pilsbry, 1904
Latisipho morditus (W.H. Dall, 1919)
Bailya morgani G.T. Watters, 2009
Austrocominella motrileia (FOSSIL) C. Nielsen, 2003 †
Buccinulum motutaraense A.W.B. Powell, 1929
Solenosteira mulepenensis (FOSSIL) E.J. Petuch, 1994 †
Hesperisternia multangulus (R.A. Philippi, 1848)
Solenosteira multilineata (FOSSIL) E.J. Petuch, 1994 †