Pyreneola melvilli (C. Hedley, 1899)
Columbella menaletta P.L. Duclos, 1846
Cotonopsis mendozana D.R. Shasky, 1970
Mitrella menkeana (L.A. Reeve, 1858)
Columbella mercatoria (C. Linnaeus, 1758)
Columbella mercatoria elongata G.W. Nowell-Usticke, 1959
Amphissa meridionalis H.A. Pilsbry & A.A. Olsson,1941
Mitrella merita (J.W. Brazier, 1877)
Aesopus meta (K.H.J. Thiele, 1925)
Nassarina metabrunnea W.H. Dall & C.T. Simpson,1901
Decipifus metellus (K.H.J. Thiele, 1925)
Sincola mexicana (FOSSIL) P.O. Jung, 1989 †
Eurypyrene miccosukee (FOSSIL) E.J. Petuch, 1991 †
Zafra microstoma (K.H.J. Thiele, 1925)
Mitrella mikra (FOSSIL) Gardner, 1947 †
Anachis milium (W.H. Dall, 1916)
Mitrella millardi Lussi, 2017
Mitrella millepunctata (P.P. Carpenter, 1864)
Pseudamycla miltostoma (J.E. Tenison-Woods,1877)
Mitrella mindorensis (L.A. Reeve, 1859)
Parvanachis minibrunnea M. De Maintenon, 2014
Mitrella minima (FOSSIL) (F. Sacco, 1890 †)
Mitrella minisipho K. Monsecour & D. Monsecour,2016
Mitrella minor (A. Scacchi, 1836)
Steironepion minus (C.B. Adams, 1845)
Zafra minuta (A.A. Gould, 1860)
Costoanachis mira (FOSSIL) W.H. Dall, 1896 †
Costoanachis mira fugax (FOSSIL) J. Brown & H.A. Pilsbry,1911 †
Anachis miser (G.B. II Sowerby, 1844)
Anachis miser polynyma (H.A. Pilsbry, 1901)
Euplica mitrata (K.T. Menke, 1843)
Zafra mitriformis A. Adams, 1860
Retizafra mitromorpha K. Monsecour & D. Monsecour,2016
Cosmioconcha modesta (W.L. Powys, 1835)
Anachis moesta (C.B. Adams, 1852)