Leptachatina microdon H.A. Pilsbry& C.M. Cooke, 1914 Hawaii
Amastra mirabilis C.M. Cooke, 1917 Hawaii
Amastra modesta (C.B. Adams, 1851) Hawaii
Amastra modicella C.M. Cooke, 1917 Hawaii
Amastra moesta (W. Newcomb, 1854) Hawaii
Leptachatina molokaiensis C.M. Cooke, 1910 Hawaii
Amastra montagui H.A. Pilsbry, 1913 Hawaii
Amastra montana D.D. Baldwin, 1906 Hawaii
Amastra montivaga C.M. Cooke, 1917 Hawaii
Leptachatina morbida C.M. Cooke, 1911 Hawaii
Amastra morticina A. Hyatt & H.A. Pilsbry,1911 Hawaii
Amastra mucronata (W. Newcomb, 1853) Hawaii
Amastra nana D.D. Baldwin, 1895 Hawaii
Amastra nannodes C.M. Cooke, 1933 Hawaii
Carelia necra C.M. Cooke, 1931 Hawaii
Amastra neglecta H.A. Pilsbry& C.M. Cooke, 1914 Hawaii
Leptachatina nematoglypta H.A. Pilsbry& C.M. Cooke, 1914 Hawaii
Amastra nigra W. Newcomb, 1855 Hawaii
Leptachatina nitida W. Newcomb, 1853 Hawaii, Maui9,1 mm
Amastra nubifera A. Hyatt & H.A. Pilsbry,1911 Hawaii
Amastra nubigena H.A. Pilsbry& C.M. Cooke, 1914 Hawaii
Amastra nubilosa (J.W. Mighels, 1845) Hawaii17 mm
Amastra nucleola (A.A. Gould, 1854) Hawaii
Amastra nucula E.A. Smith, 1873 Hawaii
Amastra obesa (W. Newcomb, 1853) Hawaii
Amastra obesa aurora H.A. Pilsbry& C.M. Cooke, 1914 Hawaii8 mm
Leptachatina obsoleta L. Pfeiffer, 1857 Hawaii
Leptachatina obtusa L. Pfeiffer, 1856 Hawaii
Leptachatina octogyrata J.T. Gulick, 1856 Hawaii
Carelia olivacea W.H. Pease, 1866 Hawaii
Leptachatina omphalodes C.M.F. Ancey, 1899 Hawaii
Leptachatina opipara C.M. Cooke, 1910 Hawaii
Leptachatina optabilis C.M. Cooke, 1911 Hawaii
Leptachatina oryza L. Pfeiffer, 1856 Hawaii
Amastra oswaldi C.M. Cooke, 1933 Hawaii