Leptachatina captiosa C.M. Cooke, 1910
Amastra caputadamantis A. Hyatt & H.A. Pilsbry,1911
Leptachatina cerealis (A.A. Gould, 1847)
Leptachatina chrysallis (L. Pfeiffer, 1855)
Leptachatina cingula (J.W. Mighels, 1845)
Laminella citrina (L. Pfeiffer, 1848)
Carelia cochlea (L.A. Reeve, 1849)
Leptachatina compacta W.H. Pease, 1869
Laminella concinna W. Newcomb, 1854
Leptachatina concolor C.M. Cooke, 1910
Amastra conica D.D. Baldwin, 1906
Leptachatina conicoides E.R. Sykes, 1900
Amastra conifera E.A. Smith, 1873
Leptachatina conspicienda C.M. Cooke, 1910
Leptachatina convexiuscula E.R. Sykes, 1900
Amastra cornea (W. Newcomb, 1854)
Leptachatina corneola (L. Pfeiffer, 1846)
Leptachatina coruscans W.D. Hartman, 1888
Leptachatina costulata (J.T. Gulick, 1856)
Leptachatina costulosa W.H. Pease, 1870
Amastra crassilabrum (W. Newcomb, 1854)
Leptachatina crystallina (J.T. Gulick, 1856)
Carelia cumingiana L. Pfeiffer, 1855
Leptachatina cuneata C.M. Cooke, 1910
Amastra cyclostoma D.D. Baldwin, 1895
Leptachatina cylindrata W.H. Pease, 1869
Amastra cylindrica (W. Newcomb, 1854)
Amastra davisiana C.M. Cooke, 1908
Leptachatina deceptor T.D.A. Cockerell, 1927
Amastra decorticata J.T. Gulick, 1873
Leptachatina defuncta C.M. Cooke, 1910
Amastra delicata C.M. Cooke, 1933
Planamastra diginophora (C.M.F. Ancey)
Planamastra digonophora (C.M.F. Ancey, 1889)
Leptachatina dimidiata (L. Pfeiffer, 1856)