Amastra micans L. Pfeiffer, 1859
Amastra mirabilis C.M. Cooke, 1917
Amastra modesta (C.B. Adams, 1851)
Amastra modicella C.M. Cooke, 1917
Amastra moesta (W. Newcomb, 1854)
Amastra montagui H.A. Pilsbry, 1913
Amastra montana D.D. Baldwin, 1906
Amastra montivaga C.M. Cooke, 1917
Amastra morticina A. Hyatt & H.A. Pilsbry,1911
Amastra mucronata (W. Newcomb, 1853)
Amastra nana D.D. Baldwin, 1895
Amastra nannodes C.M. Cooke, 1933
Amastra neglecta H.A. Pilsbry & C.M. Cooke,1914
Amastra nigra W. Newcomb, 1855
Amastra nubifera A. Hyatt & H.A. Pilsbry,1911
Amastra nubigena H.A. Pilsbry & C.M. Cooke,1914
Amastra nubilosa (J.W. Mighels, 1845)
Amastra nucleola (A.A. Gould, 1854)
Amastra nucula E.A. Smith, 1873
Amastra obesa (W. Newcomb, 1853)
Amastra obesa aurora H.A. Pilsbry & C.M. Cooke,1914
Amastra oswaldi C.M. Cooke, 1933
Amastra ovatula C.M. Cooke, 1933
Amastra pagodula C.M. Cooke, 1917
Amastra paulula C.M. Cooke, 1917
Amastra peasei E.A. Smith, 1873
Amastra pellucida D.D. Baldwin, 1895
Amastra perversa A. Hyatt & H.A. Pilsbry,1911
Amastra petricola W. Newcomb, 1855
Amastra platyla (C.M.F. Ancey, 1889)
Amastra porcus A. Hyatt & H.A. Pilsbry,1911
Amastra porphyrea (W. Newcomb, 1853)
Amastra porphyrostoma W.H. Pease, 1869
Amastra praeopima C.M. Cooke, 1917
Amastra problematica C.M. Cooke, 1933