Goniobasis bullula (I. Lea, 1861)
Elimia caelatura (L.A. Reeve, 1860)
Elimia caelatura stearnsiana R.E. Call, 1886
Elimia cahawbensis I. Lea, 1861
Pleurocera canaliculata T. Say, 1821
Pleurocera canaliculata filum I. Lea, 1845
Pleurocera canaliculata undulata T. Say
Elimia cancellata (W.H. Benson, 1833)
Elimia capillaris I. Lea, 1861
Leptoxis carinata (J.G. Bruguière, 1792)
Goniobasis carinifera (J.B.P.A. Lamarck, 1822)
Anculosa carinocostata I. Lea, 1854
Holandriana castanea (J.R. Bourguignat, 1884)
Goniobasis catenaria (T. Say, 1822)
Goniobasis catenaria dislocata (E. Ravenel, 1834)
Goniobasis catenaria vanhyningiana C. Goodrich, 1921
Elimia catenoides (I. Lea, 1842)
Elimia chiltonensis (C. Goodrich, 1941)
Leptoxis choccoloccoensis (H.H. Smith, 1922)
Elimia christyi (I. Lea, 1862)
Goniobasis circumlineata G.W. Tryon
Anculosa clara J.G. Anthony, 1854
Elimia clausa I. Lea, 1861
Elimia clavaeformis (I. Lea, 1841)
Elimia clavaeformis unciale (S.S. Haldeman, 1841)
Goniobasis clenchi C. Goodrich, 1924
Anculosa clipeata E.A. Smith, 1922
Elimia cochliaris (I. Lea, 1868)
Holandriana codiella (G. Servain, 1884)
Elimia comalensis H.A. Pilsbry, 1890
Anculosa comma T.A. Conrad, 1834
Leptoxis compacta J.G. Anthony, 1854
Goniobasis contigua I. Lea
Pleurocera corpulenta J.G. Anthony, 1854
Goniobasis costifera (L.A. Reeve, 1861)