Lithasia crassa S.S. Haldeman, 1842
Holandriana crassilabris (J.R. Bourguignat, 1884)
Lithasiopsis crassus F.G. Thompson, 1959
Elimia crenatella I. Lea, 1860
Anculosa curreyana I. Lea, 1841
Pleurocera currierianum I. Lea, 1863
Lithasia curta I. Lea, 1868
Goniobasis curvicostata (L.A. Reeve, 1861)
Anculosa cylindracea T.A. Conrad, 1834
Lithasiopsis darnelli F.G. Thompson, 1959
Elimia darwini E.L. Mihalcik& F.G. Thompson, 2002
Elimia densicostata (L.A. Reeve, 1862)
Elimia dickinsoni (W.J. Clench & H. Turner,1956)
Leptoxis dilatata T.A. Conrad, 1835
Anculosa dislocata L.A. Reeve, 1861
Holandriana divina (J.R. Bourguignat, 1884)
Elimia dooleyensis (I. Lea, 1862)
Lithasia duttoniana I. Lea, 1841
Goniobasis ebenum (I. Lea, 1841)
Elimia edgariana (I. Lea, 1841)
Goniobasis emeryensis I. Lea
Gyrotoma excisa (I. Lea, 1843)
Pleurocera excurvatum (T.A. Conrad, 1834)
Holandriana eximia (J.R. Bourguignat, 1884)
Elimia exusta E.L. Mihalcik& F.G. Thompson, 2002
Holandriana fagotiana (J.R. Bourguignat, 1884)
Elimia fascinans I. Lea, 1861
Anculosa flava I. Lea, 1862
Anculosa flexuosa H.H. Smith in C. Goodrich,1922
Goniobasis floridensis (L.A. Reeve, 1860)
Goniobasis floridensis timidus (C. Goodrich, 1942)
Io fluvialis (T. Say, 1825)
Leptoxis foremani I. Lea, 1843
Leptoxis formani (I. Lea, 1843)
Leptoxis formosa I. Lea, 1860