Niso matsumotoi J.T. Kuroda & T. Habe,1961
Melanella maui (R.K. Dell, 1952)
Bathycrinicola media P. Bouchet & A. Warén,1986
Pelseneeria media F. Koehler & C. Vaney,1908
Melanella medipacifica (H.A. Pilsbry, 1917)
Ersilia mediterranea (T.A. de M. Monterosato,1869)
Eulima mellamella Clarck, 1921
Eulima melvilli M.M. Schepman, 1909
Sabinella meridionalis P. Bartsch, 1917
Niso mesata (FOSSIL) W.P. Woodring, 1970 †
Hemiliostraca metcalfei (A. Adams, 1853)
Leiostraca metulina (A. Adams, 1864)
Melanella micans (H.F. Carpenter, 1865)
Bathycrinicola micrapex P. Bouchet & A. Warén,1986
Fuscapex microcostellatus P. Bouchet & A. Warén,1986
Niso microforis W.H. Dall, 1927
Melanella microsculpta P. Bouchet & A. Warén,1986
Melanella migrans (FOSSIL) T.A. Conrad, 1846 †
Melanella mimus H.A. Pilsbry, 1918
Oceanida mindoroensis (A. Adams & L.A. Reeve,1850)
Monogamus minibulla (A.A. Olsson& J.T.L. McGinty, 1958)
Ophieulima minima (W.H. Dall, 1927)
Hypermastus minor A. Warén, 1991
Melanella minor (P.M. Pallary, 1904)
Niso minor (FOSSIL) R.A. Philippi, 1843 †
Pelseneeria minor F. Koehler & C. Vaney,1908
Eulima minuscula W.H. Turton, 1932
Fusceulima minuta (J.G. Jeffreys, 1884)
Pelseneeria minuta (W.H. Dall, 1927)
Pyramidelloides minutus (W.H. Turton, 1932)
Eulima mioacutissima (FOSSIL) (F. Sacco, 1892 †)
Entoconcha mirabilis (J.P. Müller, 1852)
Auriculigerina miranda P. Dautzenberg, 1925
Pyramidelloides mirandus (A. Adams, 1861)
Arcuella mirifica G. Nevill & H. Nevill,1874