Epitonium mellissi (E.A. Smith, 1890)
Epitonium melvilli (M.M. Schepman, 1909)
Couthouyella menesthoides (P.P. Carpenter, 1864)
Epitonium merignacense (FOSSIL) (M.E.A. de Boury, 1912 †)
Belliscala meta (FOSSIL) R.L. Squires & Saul,2003 †
Opalia methoria R.N. Kilburn, 1985
Opalia mexicana W.H. Dall, 1908
Scalaria meyeri (FOSSIL) Gardner †
Opalia mica (FOSSIL) G. Schmelz & R. Portell,2007 †
Striaticostatum micropunctatum (FOSSIL) D.T. Dockery, 1993 †
Plesioacirsa microstriata (FOSSIL) (B. Wade, 1917 †)
Claviscala midwayensis T. Habe & S. Kosuge, 1970
Gyroscala mikeleei E.F. Garcia, 2003
Epitonium millecostatum (W.H. Pease, 1861)
Epitonium mindoroense (J. de C. Sowerby, 1844)
Opalia minervae (K.H.J. Thiele, 1925)
Scalaria minima (FOSSIL) Martin, 1879 †
Amaea minor (G.B. II Sowerby, 1873)
Epitonium minorum (T. Iredale, 1936)
Epitonium minutia (F.P. Jousseaume, 1912)
Epitonium minuticostatum (M.E.A. de Boury, 1912)
Acirsa mioplicatula (FOSSIL) F. Kautsky, 1925 †
Pliciscala miopusilla (FOSSIL) (F. Kautsky, 1925 †)
Epitonium mirabile L. Bozzetti, 2008
Cylindriscala mirifica (P. Fischer in H. Filhol,1886)
Epitonium miserum M.E.A. de Boury, 1913
Amaea mitchelli (W.H. Dall, 1896)
Epitonium mitraeforme (J. de C. Sowerby, 1844)
Cirsotrema mituokai (H. Ozaki, 1958)
Alexania moerchi (A. Adams & G.F. Angas,1864)
Opalia monovaricosa (J.T. Kuroda & T. Habe,1961)
Opalia montereyensis (W.H. Dall, 1907)
Cirsotrema montrouzieri S.M. Souverbie, 1872
Cycloscala montrouzieri E.F. Garcia, 2004
Epitonium moolenbeeki J.J. Van Aartsen, 1996