Crassispira lesbarritzensis P. Lozouet, 2015
Pilsbryspira leucocyma (W.H. Dall, 1884)
Tiariturris libya (W.H. Dall, 1919)
Knefastia limonensis (FOSSIL) A.A. Olsson, 1922 †
Knefastia lindae (FOSSIL) E.J. Petuch, 1994 †
Otitoma lirata (L.A. Reeve, 1845)
Antiplanes litus W.H. Dall, 1919
Crassispira logani (FOSSIL) A. Dey, 1961 †
Crassispira lomata (FOSSIL) W.P. Woodring, 1928 †
Crassispira losquemadica (FOSSIL) (C.J. Maury, 1917 †)
Pilsbryspira loxospira (H.A. Pilsbry & H.N. Lowe,1932)
Crassispira luctuosa d'Orbigny, 1842
Comitas lurida (A. Adams & L.A. Reeve,1850)
Comitas luzonica A.W.B. Powell, 1969
Crassispira lyopleura (FOSSIL) McNeil, 1984 †
Monilispira lysidia (P.L. Duclos, 1850)
Hindsiclava macilenta (W.H. Dall, 1889)
Crassispira mackintoshi P.J. Fallon, 2011
Leucosyrinx macrobertsoni A.W.B. Powell, 1958
Hormospira maculosa (G.B. I Sowerby, 1834)
Maesiella maesae J.H. McLean & L.H. Poorman,1971
Leucosyrinx mai B.Q. Li & X.Z. Li, 2008
Comitas makiyamai T. Shuto, 1961
Comitas malayana (K.H.J. Thiele, 1925)
Compsodrillia mammillata J.T. Kuroda & K. Oyama,1971
Carinodrillia mamona L.F. Corea, 1934
Crassispira maonisriparum (FOSSIL) (C.J. Maury, 1917 †)
Antimelatoma maoria R.K. Dell, 1995
Comitas margaritae (E.A. Smith, 1904)
Crassispira margaritula (FOSSIL) (G.P. Deshayes, 1834 †)
Crassispira martiae J.H. McLean & L.H. Poorman,1971
Crassispira masinoi P.J. Fallon, 2011
Inquisitor mastersi (J.W. Brazier, 1876)
Meggittia maungmagana H.C. Ray, 1977
Crassispira maura (G.B. I Sowerby, 1834)