Eutrochatella chittyana (L. Pfeiffer, 1858) Jamaica9,6 mm
Helicina christophori H.A. Pilsbry, 1897
Troschelviana chrysochasma (F. Poey, 1853) Cuba7 mm
Troschelviana chrysochasma jucunda (J. Gundlach in L. Pfeiffer, 1863) Cuba6 mm
Tristramia chrysocheila (W.G. Binney, 1851) Mexico, Nuevo León
Lucidella cibaoensis (J.C.H. Crosse, 1891)
Emoda ciliata (F. Poey, 1852) Cuba19,52 mm
Oxyrhombus cinctella (R.J. Shuttleworth, 1852) Veracruz, Mexico
Helicina circumlineata G.W. Tryon, 1866
Sulfurina citrinella (O.F. von Möllendorff,1893) Philippines, Siquijor5 mm
Eutrochatella citrinocallosa A.J. Wagner, 1911 Cuba10,5 mm
Alcadia citrinolabris (C.B. Adams, 1849) Jamaica
Helicina clappi H.A. Pilsbry, 1909 Florida Keys
Emoda clementis W.J. Clench& C.G. Aguayo, 1950 Cuba
Helicina colorata W.H. Pease, 1868
Poeniella columbiana R.C. Pierce, 2001 Venezuela
Helicina columellaris J. Gundlach, 1857 Cuba15 mm
Ogasawarana comes (A.J. Wagner, 1909) Japan, Ogasawara Islands
Helicina concentrica L. Pfeiffer, 1848 Venezuela7 mm
Alcadia concinna (J. Gundlach in L. Pfeiffer, 1857) Barbados
Ceratopoma congener (E.A. Smith, 1889) Papua New Guinea
Semitrochatella conica (L. Pfeiffer, 1839) Cuba
Poeniella conoidea H.A. Pilsbry, 1933 Dominican Republic
Alcadia consanguinea (C.B. Adams, 1850) Jamaica
Priotrochatella constellata (P.M.A. Morelet, 1847) Cuba
Helicina constricta L. Pfeiffer, 1849 Hawaii
Helicina contamanoensis H.B. Preston, 1914
Ceratopoma contermina (W. Kobelt, 1884)
Troschelviana continua (J. Gundlach in L. Pfeiffer, 1858) Cuba
Idesa conuloides (A.E.J. Férussac, 1822) Dominica
Idesa conuloides (R.J.L. Guppy, 1868) Dominica
Helicina conus A.J. Wagner, 1911 Peru, Huanchaco
Olygyra convexa L. Pfeiffer, 1849 Florida6 mm
Orobophana cookei M.C. Neal, 1934 Hawaii
Olygyra cordillerae L. Pfeiffer, 1857 Veracruz, Mexico