Lissospira bushae (W.H. Dall, 1927)
Skenea bythinoides J.G. Jeffreys, 1875
Leucorhynchia caledonica J.C.H. Crosse, 1867
Haplocochlias calidimaris (H.A. Pilsbry& J.T.L. McGinty, 1945)
Skenea californica (P. Bartsch, 1907)
Leucorhynchia callifera (FOSSIL) (G.P. Deshayes, 1832 †)
Liotella cancellata (C.F.F. von Krauss, 1848)
Leucorhynchia candida (C.B. Adams, 1862)
Liotella capitata (C. Hedley, 1907)
Cirsonella carinata (C. Hedley, 1903)
Pseudorbis carinifera (FOSSIL) P. Lozouet, 1999 †
Skenea carmelensis A.G. Smith & W.J. Gordon,1948
Skenea catenoides (T.A. de M. Monterosato,1877)
Mikro cerion (W.H. Dall, 1927)
Haplocochlias christopheri F. Rubio & E. Rolán, 2015
Lodderia coatsiana (J.C. Melvill & R. Standen,1912)
Liotella compacta (W.F. Petterd, 1884)
Haplocochlias compactus (W.H. Dall, 1889)
Parviturbo comptus (W.P. Woodring, 1928)
Haplocochlias concepcionensis (H.N. Lowe, 1933)
Skenea concordia (P. Bartsch, 1920)
Cirsonella congrua (FOSSIL) (C.R. Laws, 1941 †)
Lissospira conica (W.H. Dall, 1927)
Cirsonella consobrina A.W.B. Powell, 1930
Lissospira convexa K.J. Bush, 1897
Liotella corona (C. Hedley, 1902)
Skenea coronadoensis (R. Arnold, 1903)
Liotella crassicostata (H. Strebel, 1908)
Leucorhynchia crossei G.W. Tryon, 1888
Skenea crossi G.W. Tryon, 1888
Haplocochlias cubensis J. Espinosa, J.A. Ortea& R. Fernández-Garcés, 2007
Cirsonella cubitalis (C. Hedley, 1907)
Dikoleps cutleriana (W. Clark, 1849)
Haplocochlias cyclophoreus P.P. Carpenter, 1864
Lissospira dalli (A.E. Verrill, 1882)