Polygyra latispira H.A. Pilsbry, 1896 USA
Praticolella lawae (J. Lewis, 1874) Alabama
Patera leatherwoodi W.L. Pratt, 1971
Ashmunella lenticula W.O. Gregg, 1953 Arizona, Cochise County
Daedalochila leporina A.A. Gould, 1848 Alabama
Ashmunella levettei (T.B. Bland, 1881) Arizona, Cochise County
Polygyra lingulata (G.P. Deshayes in A.E.J. Férussac, 1859) Cuba
Neohelix lioderma H.A. Pilsbry, 1902
Millerelix lithica (L.R. Hubricht, 1961) Arkansas
Allogona lombardii M. Smith, 1943 USA, Idaho
Triodopsis loperi H.A. Pilsbry
Trilobopsis loricata (A.A. Gould, 1846) Oregon
Ashmunella macromphala J. Vagvolgyi, 1974
Inflectarius magazinensis (H.A. Pilsbry& J.H. Ferriss, 1907) Arkansas
Stenotrema magnafumosum H.A. Pilsbry, 1900 USA, Georgia
Cryptomastix magnidentata H.A. Pilsbry, 1940
Neohelix major (A. Binney, 1837)
Triodopsis maratima H.A. Pilsbry, 1890
Vespericola marinensis B. Roth & W.B. Miller,1993
Eduardus martensiana (H.A. Pilsbry, 1907) Mexico, Tampico
Linisia matermontana (H.A. Pilsbry, 1896) Mexico, Colima
Stenotrema maxillatum A.A. Gould, 1848 Alabama
Ashmunella mearnsii (W.H. Dall, 1895) Arizona, Cochise County
Vespericola megasoma (H.A. Pilsbry, 1928) California12 mm
Ashmunella mendax H.A. Pilsbry& J.H. Ferriss, 1917 New Mexico. Sierra County17,9 mm
Ashmunella meridionalis H.A. Pilsbry, 1948 Mexico, Chihuahua
Triodopsis messana L.R. Hubricht, 1952 South Carolina
Ashmunella metamorphosa H.A. Pilsbry, 1905
Praticolella mexicana K.E. Perez, 2011 Mexico, Nuevo León
Ashmunella microdonta H.A. Pilsbry& J.H. Ferriss, 1909
Ashmunella milesi D.M. Reeder, 1993 Mexico, Chihuahua
Mesodon mitchellianus H.C. Lea, 1839 Indiana
Praticolella mobiliana (H.C. Lea, 1841) Alabama
Ashmunella mogollonensis H.A. Pilsbry, 1905 New Mexico, Socorro County
Stenotrema monodon T. Rackett, 1821 USA, Texas