Drymaeus membielinus J.C.H. Crosse, 1867
Drymaeus membranaceus (L.A. Reeve, 1849)
Bulimulus mendozanus P. von Ströbel, 1874
Mesembrinus meridanus (L. Pfeiffer, 1846)
Bostryx metagyra H.A. Pilsbry & A.A. Olsson,1949
Lissoacme metamorphus (H.A. Pilsbry, 1896)
Drymaeus mexicanus (J.B.P.A. Lamarck, 1822)
Drymaeus mexicanus primularis (L.A. Reeve, 1849)
Drymaeus miliaris R.A. Philippi, 1867
Neopetraeus millegranus E.C. Von Martens, 1885
Naesiotus milleri (L. Hoffman, 1987)
Drymaeus miltochrous J.A. Albers, 1854
Naesiotus minutissimus J.J. Parodíz, 1962
Scutalus minutus A.S.H. Breure, 1978
Bostryx modestus (W.J. Broderip, 1832)
Bostryx modestus angelmaldonadoi W.K. Weyrauch, 1960
Bulimulus moei J.J. Parodíz, 1962
Bulimulus mollicellus L.A. Reeve, 1849
Bulimulus monachus (L. Pfeiffer, 1857)
Bostryx moniezi P. Dautzenberg, 1896
Mesembrinus monilifer (L.A. Reeve, 1848)
Drymaeus montagnei (A.V.M.D. D'Orbigny,1836)
Naesiotus montezuma W.H. Dall, 1893
Bostryx monticola A. Doering, 1879
Rabdotus monticola W.H. Dall, 1893
Naesiotus montivagus (A.V.M.D. D'Orbigny,1835)
Naesiotus montivagus chacoensis C.M.F. Ancey, 1897
Bostryx mordani A.S.H. Breure, 1978
Drymaeus morenoi H.B. Preston, 1907
Mesembrinus moricandi (L. Pfeiffer, 1847)
Mesembrinus moritinctus (E.C. Von Martens, 1893)
Mesembrinus mossi (E.A. Smith, 1896)
Mesembrinus moussoni (L. Pfeiffer, 1853)
Drymaeus muelleggeri S.G.A. Jaeckel, 1927
Mesembrinus muliebris (L.A. Reeve, 1849)