Zardinistylus misurinensis (FOSSIL) (Zardini, 1978 †)
Echineulima mittrei (S.A.A. Petit De La Saussaye, 1851)
Costaclis mizon (R.B. Watson, 1881)
Eulima modesta K.H.J. Thiele, 1925
Melanella modesta K.H.J. Thiele, 1930
Eulima modicella A. Adams, 1854
Melanella montageuana (T. Iredale, 1914)
Eulima montagueana T. Iredale, 1914
Melanella montereyensis P. Bartsch, 1917
Hemiliostraca montrouzieri (S.M. Souverbie, 1872)
Stilapex montrouzieri (S.M. Souverbie, 1869)
Chileutomia morgani (FOSSIL) A.E.M. Cossmann, 1915 †
Bacula morisyuichiroi (T. Habe, 1968)
Thyonicola mortenseni G. Mandahl-Barth, 1941
Trochostilifer mortenseni A. Warén, 1980
Parvioris mortoni A. Warén, 1981
Hypermastus mucronatus (G.B. III Sowerby, 1866)
Enteroxenos muelleri (C.G. Semper, 1868)
Melanella muelleriae (R. Sturany, 1904)
Eulima mulata E. de C. Rios& R.S. Absalão, 1990
Pyramidelloides multicostatus M.J. Faber, 1990
Melanella mundula (C.B. Adams, 1861)
Sabinella munita (C. Hedley, 1903)
Fusceulima murdochi (C. Hedley, 1904)
Balcis musta (FOSSIL) (M. Yokoyama, 1928 †)
Melanella myriotrochi P. Bouchet & A. Warén,1986
Bathycrinicola nacraensis A. Peñas & G. Giribet,2003
Niso nakayasui T. Habe, 1976
Nanobalcis nana (T.A. de M. Monterosato,1878)
Thyca nardoafrianti (T. Habe, 1976)
Clypeastericola natalensis A. Warén, 1994
Parvioris natalensis (E.A. Smith, 1899)
Eulima naumanni (FOSSIL) von Könen, 1867 †
Chileutomia neozelanica A.W.B. Powell, 1940
Niso neozelanica (FOSSIL) H.H. Suter, 1917 †