Eutrochatella chittyana (L. Pfeiffer, 1858)
Helicina christophori H.A. Pilsbry, 1897
Troschelviana chrysochasma (F. Poey, 1853)
Troschelviana chrysochasma jucunda (J. Gundlachin L. Pfeiffer, 1863)
Tristramia chrysocheila (W.G. Binney, 1851)
Lucidella cibaoensis (J.C.H. Crosse, 1891)
Emoda ciliata (F. Poey, 1852)
Oxyrhombus cinctella (R.J. Shuttleworth, 1852)
Helicina circumlineata G.W. Tryon, 1866
Sulfurina citrinella (O.F. von Möllendorff,1893)
Eutrochatella citrinocallosa A.J. Wagner, 1911
Alcadia citrinolabris (C.B. Adams, 1849)
Helicina clappi H.A. Pilsbry, 1909
Emoda clementis W.J. Clench & C.G. Aguayo,1950
Helicina colorata W.H. Pease, 1868
Poeniella columbiana R.C. Pierce, 2001
Helicina columellaris J. Gundlach, 1857
Ogasawarana comes (A.J. Wagner, 1909)
Helicina concentrica L. Pfeiffer, 1848
Alcadia concinna (J. Gundlachin L. Pfeiffer, 1857)
Ceratopoma congener (E.A. Smith, 1889)
Semitrochatella conica (L. Pfeiffer, 1839)
Poeniella conoidea H.A. Pilsbry, 1933
Alcadia consanguinea (C.B. Adams, 1850)
Priotrochatella constellata (P.M.A. Morelet, 1847)
Helicina constricta L. Pfeiffer, 1849
Helicina contamanoensis H.B. Preston, 1914
Ceratopoma contermina (W. Kobelt, 1884)
Troschelviana continua (J. Gundlachin L. Pfeiffer, 1858)
Idesa conuloides (A.E.J. Férussac, 1822)
Idesa conuloides (R.J.L. Guppy, 1868)
Helicina conus A.J. Wagner, 1911
Olygyra convexa L. Pfeiffer, 1849
Orobophana cookei M.C. Neal, 1934
Olygyra cordillerae L. Pfeiffer, 1857