Amastra pullata D.D. Baldwin, 1895
Amastra pullata umbrosa D.D. Baldwin, 1895
Amastra pusilla W. Newcomb, 1855
Amastra reticulata (W. Newcomb, 1854)
Amastra reticulata dispersa A. Hyatt & H.A. Pilsbry,1911
Amastra reticulata orientalis A. Hyatt & H.A. Pilsbry,1911
Amastra ricei C.M. Cooke, 1917
Amastra rubens (A.A. Gould, 1854)
Amastra rubida J.T. Gulick, 1873
Amastra rubristoma D.D. Baldwin, 1906
Amastra rugulosa (W.H. Pease, 1870)
Amastra seminigra A. Hyatt & H.A. Pilsbry,1911
Amastra seminuda D.D. Baldwin, 1906
Amastra senilis D.D. Baldwin, 1903
Amastra sericea L. Pfeiffer, 1859
Amastra similaris W.H. Pease, 1870
Amastra sinistrorsa D.D. Baldwin, 1906
Amastra sola A. Hyatt & H.A. Pilsbry,1911
Amastra solida W.H. Pease
Amastra soror (W. Newcomb, 1854)
Amastra sphaerica W.H. Pease, 1870
Amastra spicula D.D. Baldwin, 1903
Amastra spirizona (A.E.J. Férussac, 1834)
Amastra spirizona nigrolabris E.A. Smith, 1873
Amastra subcornea A. Hyatt & H.A. Pilsbry,1911
Amastra subcrassilabris A. Hyatt & H.A. Pilsbry,1911
Amastra subobscura A. Hyatt & H.A. Pilsbry,1911
Amastra subrostrata L. Pfeiffer, 1859
Amastra subsoror A. Hyatt & H.A. Pilsbry,1911
Amastra sykesi A. Hyatt & H.A. Pilsbry,1911
Amastra tenuilabris J.T. Gulick, 1873
Amastra tenuispira D.D. Baldwin, 1895
Amastra textilis (A.E.J. Férussac, 1825)
Amastra textilis cookei (A. Hyatt & H.A. Pilsbry,1911)
Amastra thaanumi A. Hyatt & H.A. Pilsbry,1911