Triodopsis burchi L.R. Hubricht, 1950
Upsilodon burlesoni A. Metcalf & D.H. Riskind,1978
Stenotrema burringtoni F.W. Grimm, 1971
Stenotrema caddoensis (S. Archer, 1935)
Stenotrema calvescens L.R. Hubricht, 1961
Praticolella campi W.F. Clapp & J.H. Ferriss,1919
Praticolella candida L.R. Hubricht, 1983
Linisia cantralli G.A. Solem, 1957
Ashmunella carlsbadensis H.A. Pilsbry, 1932
Xolotrema caroliniense H.C. Lea, 1834
Polygyra cereolus (J.K. Megerle Von Mühlfeld,1816)
Polygyra cereolus carpenteriana (T.B. Bland, 1860)
Webbhelix chadwicki (J.H. Ferriss, 1907)
Stenotrema cheatumi (W. Fullington, 1974)
Polygyra chiapensis (L. Pfeiffer, 1856)
Appalachina chilhoweensis (J. Lewis, 1870)
Ashmunella chiricahuana (W.H. Dall, 1896)
Daedalochila chisosensis H.A. Pilsbry, 1936
Fumonelix christyi (T.B. Bland, 1860)
Triodopsis claibornensis A. Lutz, 1950
Patera clarki H.C. Lea, 1858
Mesodon clausus T. Say, 1821
Patera clenchi H.A. Rehder, 1932
Mesodon clingmanicus (H.A. Pilsbry, 1904)
Ashmunella cockerelli H.A. Pilsbry & J.H. Ferriss,1917
Stenotrema cohuttense W.F. Clapp, 1914
Vespericola columbiana (J. Henderson, 1928)
Triodopsis complanata (H.A. Pilsbry, 1898)
Triodopsis copei (A. Wetherby, 1878)
Giffordius corneliae H.A. Pilsbry, 1930
Polygyra couloni (R.J. Shuttleworth, 1852)
Triodopsis cragini R.E. Call, 1886
Upsilodon dalli A. Metcalf & D.H. Riskind,1978
Ashmunella danielsi H.A. Pilsbry & J.H. Ferriss,1915
Stenotrema deceptum W.F. Clapp, 1905