Austrofusus marshalli (FOSSIL) L. C. King, 1933 †
Cominella marshalli (FOSSIL) (C.R. Laws, 1932 †)
Enigmaticolus marshalli Fraussen & Stahlschmidt,2016
Aeneator martae J.F. Araya, 2013
Colus martensi (A. Krause, 1885)
Meteuthria martensi (H. Strebel, 1905)
Euthria martensiana F.W. Hutton, 1878
Metula martini (FOSSIL) E.W. Vredenburg, 1925 †
Cantharus martiniana (FOSSIL) Noetling, 1901 †
Austrofusus marwicki (FOSSIL) L. C. King, 1933 †
Penion marwicki (FOSSIL) Finlay, 1930 †
Siphonalia marybethi M. Parth, 1996
Penion masoni (FOSSIL) (C.A. Fleming, 1943 †)
Buccinum matajiroi (FOSSIL) J. Makiyama, 1959 †
Buccinum matchgarense J. Makiyama, 1935
Engina maura (G.B. I Sowerby, 1832)
Penion maximus (G.W. Tryon, 1881)
Pollia maxwelli (FOSSIL) (A.A. Olsson& A. Harbison, 1953 †)
Plicifusus mcleani B.I. Sirenko, 2009
Retimohnia mcleani A. Kosyan & Y.I. Kantor,2016
Buccinulum medium (FOSSIL) F.W. Hutton, 1885 †
Chauvetia megastoma P.G. Oliver & E. Rolán,2009
Kelletia mekranica (FOSSIL) E.W. Vredenburg, 1925 †
Cantharus melanostoma (G.B. I Sowerby, 1825)
Pyrulofusus melonis (W.H. Dall, 1891)
Lussivolutopsius memmi Y.I. Kantor, 1990
Colus menapiae (FOSSIL) F.W. Harmer, 1914 †
Engina mendicaria (C. Linnaeus, 1758)
Engina mendicaria unilineata P. Dautzenberg, 1929
Solenosteira mendozana (S.S. Berry, 1959)
Solenosteira mengeana W.H. Dall, 1890
Engina menkeana (R.W. Dunker, 1860)
Engina menkeana submenkeana H.A. Pilsbry, 1901
Suessionia menteathi (FOSSIL) A.E.M. Cossmann, 1923 †
Glypteuthria meridionalis (E.A. Smith, 1881)