Novastoa lamellosa (F.W. Hutton, 1873)
Petaloconchus lamellosus H.S. Ladd, 1972
Petaloconchus laurae D. Scuderi, 2012
Serpulorbis laxatus (FOSSIL) G.P. Deshayes, 1861 †
Dendropoma lebeche J. Templado, G. Richter& I.S. Calvo, 2016
Vermetus leognanensis (FOSSIL) A.E.M. Cossmann& M.A. Peyrot, 1922 †
Dendropoma leucozonias (O.A.L. Mörch, 1861)
Stephopoma levispinosum R. Bieler, 1997
Serpulorbis libertina A.A. Gould, 1859
Thylacodes ligata (FOSSIL) A.E.M. Cossmann, 1923 †
Petaloconchus lilacinus (O.A.L. Mörch, 1862)
Petaloconchus lilandikike D.P. Kelly, 2007
Dendropoma lituella (O.A.L. Mörch, 1861)
Serpulorbis llajasensis (FOSSIL) R.L. Squires, 1990 †
Thylacodes longifilis O.A.L. Mörch, 1862
Thylacodes lornensis (FOSSIL) (J. Marwick, 1926 †)
Dendropoma luchuanum (J.T. Kuroda, 1928)
Petaloconchus macrophragma P.P. Carpenter, 1857
Serpulorbis major (FOSSIL) A.L. Chavan, 1937 †
Cupolaconcha maldivensis R.E. Golding, R. Bieler, T.A. Rawlings& T.M. Collins, 2014
Stephopoma mamillatum J.E. Morton & A.M. Keen,1960
Dendropoma marchadi A.M. Keen & J.E. Morton,1960
Thylacodes margaritaceus (C. Rousseau in J.C. Chenu,1844)
Thylacodes masier (G.P. Deshayes, 1843)
Ceraesignum maximum (G.B. I Sowerby, 1825)
Petaloconchus mcgintyi (A.A. Olsson & A. Harbison,1953)
Thylacodes medusae H.A. Pilsbry, 1891
Thylacodes megalostomus O.A.L. Mörch, 1865
Dendropoma mejillonensis L. Pacheco & J. Laudien,2008
Petaloconchus merkana H.S. Ladd, 1972
Cupolaconcha meroclista (J.A. Hadfield & E.A. Kay,1972)
Vermetus milleti (FOSSIL) G.P. Deshayes, 1839 †
Vermetus milleti pseudoturritella (FOSSIL) Boettger, 1906 †
Dendropoma mirabilis (J.E. Gray, 1831)
Petaloconchus montereyensis W.H. Dall, 1919