Amastra spicula D.D. Baldwin, 1903
Amastra spirizona (A.E.J. Férussac, 1834)
Amastra spirizona nigrolabris E.A. Smith, 1873
Leptachatina stiria J.T. Gulick, 1856
Laminella straminea (L.A. Reeve, 1850)
Leptachatina striata W. Newcomb, 1861
Leptachatina striatula (A.A. Gould, 1845)
Amastra subcornea A. Hyatt & H.A. Pilsbry,1911
Amastra subcrassilabris A. Hyatt & H.A. Pilsbry,1911
Amastra subobscura A. Hyatt & H.A. Pilsbry,1911
Leptachatina subovata C.M. Cooke, 1910
Amastra subrostrata L. Pfeiffer, 1859
Amastra subsoror A. Hyatt & H.A. Pilsbry,1911
Leptachatina subula J.T. Gulick, 1856
Leptachatina succincta (W. Newcomb, 1855)
Leptachatina supracostata E.R. Sykes, 1900
Amastra sykesi A. Hyatt & H.A. Pilsbry,1911
Leptachatina tantilla C.M. Cooke, 1911
Carelia tenebrosa C.M. Cooke, 1931
Leptachatina tenebrosa W.H. Pease, 1870
Leptachatina tenuicostata W.H. Pease, 1869
Amastra tenuilabris J.T. Gulick, 1873
Amastra tenuispira D.D. Baldwin, 1895
Leptachatina terebralis J.T. Gulick, 1856
Leptachatina teres L. Pfeiffer, 1856
Laminella tetrao W. Newcomb, 1855
Amastra textilis (A.E.J. Férussac, 1825)
Amastra textilis cookei (A. Hyatt & H.A. Pilsbry,1911)
Amastra thaanumi A. Hyatt & H.A. Pilsbry,1911
Amastra thurstoni C.M. Cooke, 1917
Amastra transversalis L. Pfeiffer, 1856
Amastra tricincta A. Hyatt & H.A. Pilsbry,1911
Amastra tristis (A.E.J. Férussac, 1825)
Leptachatina triticea J.T. Gulick, 1856
Carelia turricula (J.W. Mighels, 1845)