Leucosyrinx mawsoni A.W.B. Powell, 1958 Antarctica
Crassispira mayaguanaensis P.J. Fallon, 2011 Bahamas
Crassispira mekranica (FOSSIL) E.W. Vredenburg, 1925 †
Pilsbryspira melchersi (K.T. Menke, 1852) West Panama18 mm
Comitas melvilli (M.M. Schepman, 1913) Indonesia, Banda Sea
Miraclathurella mendozana D.R. Shasky, 1971 Panama West
Crassispira mennoi D. De Jong& H.E. Coomans, 1988
Thelecytharella metuloides (R.N. Kilburn, 1995)
Crassispira meunieri (FOSSIL) (C.J. Maury, 1910 †) Florida, Alum Bluff formation41 mm
Tripia microcheila (FOSSIL) F.E. Edwards † UK, England, Hampshire8 mm
Crassispira microstoma E.A. Smith, 1882
Hindsiclava militaris (R.B. Hinds, in L.A. Reeve, 1843) Panama, Chiriqui Bay32,1 mm
Cheungbeia mindanensis (E.A. Smith, 1877) Myanmar
Crassispira mindegyiensi (FOSSIL) E.W. Vredenburg, 1921 † Myanmar, Mandalay, Myingyan
Inquisitor minimarus S. Kosuge, 1993 Australia, Keppel Bay
Inquisitor minutosternalis S. Kosuge, 1993 Western Australia
Inquisitor mirabelflorenti T. Cossignani, 2016 Philippines, Mindanao27,3 mm
Otitoma mitra (R.N. Kilburn, 1986) Mozambique, Bazaruto Island6,4 mm
Naudedrillia mitromorpha R.N. Kilburn, 1988
Comitas miyazakiensis T. Shuto, 1961 Japan
Pseudomelatoma moesta (P.P. Carpenter, 1864) USA, California
Lioglyphostoma moinica (FOSSIL) (A.A. Olsson, 1922 †) Costa Rica, Pueblo Nuevo
Crassispira monilecosta F. Fernandes, E. Rolán& J. Otero-Schmidt, 1995 Angola
Crassispira monilifera (P.P. Carpenter, 1857) Nicaragua18 mm
Crassispira monilis (P. Bartsch& H.A. Rehder, 1939) Florida, Sanibel Island10,2 mm
Crassispira montereyensis (R.E.C. Stearns, 1871) America
Antiplanes motojimai (T. Habe, 1958) Indo-Pacific
Crassispira multicostata P.J. Fallon, 2011
Inquisitor multilirata (E.A. Smith, 1877) Philippines
Epidirona multiseriata (E.A. Smith, 1877) China, Beibu Gulf
Comitas murrawolga (T.A. Garrard, 1961) Philippines, Balut Island76 mm
Crassispira myaukmigonensis (FOSSIL) E.W. Vredenburg, 1921 † Myanmar, Magway, Thayetmyo
Compsodrillia nakamurai J. Makiyama, 1931 China, Zhejiang14,7 mm
Comitas nana (FOSSIL) P.A. Maxwell, 1988 †
Compsodrillia nana P. Bartsch, 1934 Puerto Rico