Cirsotrema lyratum (FOSSIL) (C.A. von Zittel, 1864 †)
Epitonium mackayi (FOSSIL) (J. Marwick, 1943 †)
Opalia mackayi (FOSSIL) P.A. Maxwell, 1992 †
Epitonium macleani H. DuShane, 1970
Epitonium macromphalus (E.A. Smith, 1910)
Epitonium maestratii E.F. Garcia, 2003
Epitonium magellanicum (R.A. Philippi, 1845)
Nitidiscala magellanicus (FOSSIL) (R.A. Philippi, 1845 †)
Plastiscala magna (J.H. Gatliff& C.J. Gabriel, 1910)
Amaea magnifica (Sowerby, 1844)
Epitonium malayanum (K.H.J. Thiele, 1925)
Epitonium malcolmense (J.C. Melvill, 1898)
Epitonium malhaensis (F.P. Jousseaume, 1894)
Opalia mammosa (J.C. Melvill & R. Standen,1903)
Epitonium maraisi R.N. Kilburn, 1985
Epitonium margarita (F.P. Jousseaume, 1912)
Claviscala marginata (FOSSIL) (F.W. Hutton, 1885 †)
Epifungium marki E. Gittenberger& A. Gittenberger, 2005
Epitonium marmoratum (G.B. II Sowerby, 1844)
Cirsotrema marshalli (FOSSIL) C.R. Laws, 1935 †
Amaea marteli (M.E.A. de Boury, 1913)
Acirsa martensi (M.E.A. de Boury, 1913)
Amaea martinii (W. Wood, 1828)
Opalia martis (K.H.J. Thiele, 1925)
Cirsotrema martyr (T. Iredale, 1936)
Epitonium marylandica (FOSSIL) Martin, 1904 †
Opalia matajiroi (J.T. Kuroda, 1954)
Amaea mathildona (H. Masahito, J.T. Kuroda& T. Habe, 1971)
Amaea mathildopsis (K.H. Barnard, 1963)
Epitonium matthewsae W.J. Clench & H. Turner,1952
Opalia mauritanica F.F. Talavera, 1975
Funiscala maxwelli H.J. Finlay, 1930
Acirsa mcleani B.I. Sirenko, 2009
Opalia megalodon E.F. Garcia, 2004
Epitonium melior (J.C. Melvill & R. Standen,1903)