Amastra abavus A. Hyatt & H.A. Pilsbry,1911
Leptachatina accincta (J.W. Mighels, 1845)
Leptachatina acuminata (A.A. Gould, 1847)
Amastra aemulator A. Hyatt & H.A. Pilsbry,1911
Amastra affinis (W. Newcomb, 1854)
Cyclamastra agglutinans (W. Newcomb, 1853)
Tropidoptera alata (L. Pfeiffer, 1856)
Amastra albocincta H.A. Pilsbry & C.M. Cooke,1914
Amastra albolabris (W. Newcomb, 1854)
Laminella alexandri W. Newcomb, 1865
Amastra amicta E.A. Smith
Carelia anceophila C.M. Cooke, 1931
Leptachatina anceyana C.M. Cooke, 1910
Amastra anthonii W. Newcomb, 1861
Amastra antiqua D.D. Baldwin, 1895
Leptachatina antiqua W.H. Pease, 1870
Leptachatina approximans C.M.F. Ancey, 1897
Leptachatina arborea E.R. Sykes, 1900
Leptachatina artata C.M. Cooke, 1911
Laminella aspera D.D. Baldwin, 1908
Amastra assimilis (W. Newcomb, 1854)
Leptachatina attenuata C.M. Cooke, 1911
Amastra aurostoma D.D. Baldwin, 1896
Amastra badia D.D. Baldwin, 1895
Leptachatina baldwini A. Hyatt & H.A. Pilsbry,1911
Leptachatina balteata W.H. Pease, 1870
Carelia bicolor (J.C. Jay, 1839)
Carelia bicolor fuliginea (L. Pfeiffer, 1854)
Amastra biplicata (W. Newcomb, 1854)
Amastra borcherdingi A. Hyatt & H.A. Pilsbry,1911
Amastra breviata D.D. Baldwin, 1895
Leptachatina brevicula W.H. Pease, 1869
Laminella bulbosa J.T. Gulick, 1858
Leptachatina callosa (L. Pfeiffer, 1857)
Leptachatina capitosa C.M. Cooke, 1910