Calycoceras boreale (FOSSIL) A. Hyatt 1900 †
Calycoceras boreale (FOSSIL) Kennedy Cobban& Landman, 1996 †
Nigericeras bulbosum (FOSSIL) (Reyment, 1954 †) Nigeria68 mm
Protacanthoceras bunburianum (FOSSIL) Sharpe, 1853 † Venezuela,
Acompsoceras calabarense (FOSSIL) Zaborski, 1985 † Nigeria, Akwa Ibom, Ika
Kamerunoceras calvertense (FOSSIL) Powell, 1963 † Egypt, Janub Sina', At-Tur
Calycoceras canitaurinum (FOSSIL) (F. Haas, 1949 †) USA, Wyoming
Mantelliceras cantianum (FOSSIL) Spath, 1926 † France, Basse-Normandie, Orne91 mm
Mantelliceras charlestoni (FOSSIL) Kellum & Mintz, 1962 † Mexico, Coahuila, Francisco I. Madero
Acanthoceras chasca (FOSSIL) Benavides-Caceres, 1956 † Peru, Cajamarca, Celendín
Spathites chispaensis (FOSSIL) Kummel & Decker, 1954 †
Utaturiceras chrysanthemum (FOSSIL) E. Matsumoto & al.,2003 † Japan, Hokkaido, Horokanai
Dunveganoceras clowi (FOSSIL) Warren & Stelck, 1955 † Canada, Alberta, Division No. 3
Burroceras clydense (FOSSIL) Cobban, Hook& J. Kennedy, 1989 † USA, New Mexico
Spathites coahuilaensis (FOSSIL) (Jones, 1938 †) USA, New Mexico
Watinoceras cobbani (FOSSIL) M. Collignon, 1966 † USA, New Mexico
Mantelliceras cobbani (FOSSIL) Amédro, 1993 †
Eucalycoceras collignoni (FOSSIL) (Fabre, 1940 †)
Pseudaspidoceras collignoni (FOSSIL) Cobban & P.H. Scott,1972 †
Watinoceras coloradoense (FOSSIL) (Henderson, 1908 †) USA, Colorado, Boulder
Watinoceras coloradoense praecursor (FOSSIL) Wright & J. Kennedy,1981 † UK, Devon
Jeanrogericeras combesi (FOSSIL) Sornay, 1951 † France, Poitou-Charentes, Charente-Maritime105 mm
Acanthoceras compitalis (FOSSIL) Stoyanow, 1949 †
Protacanthoceras compressum (FOSSIL) (Jukes Browne, 1896 †) UK, England
Mammites conciliatum (FOSSIL) (F. Stoliczka, 1865 †) Madagascar172 mm
Dunveganoceras conditum (FOSSIL) F. Haas, 1951 † USA, Wyoming
Sumitomoceras conlini (FOSSIL) Wright & J. Kennedy 1981 †, Arizona, Coconino County
Mitonia constricta (FOSSIL) Renz, 1982 † Venezuela, Portuguesa
Cunningtoniceras cookense (FOSSIL) Cobban, Hook& J. Kennedy, 1989 † USA, New Mexico
Mantelliceras corroyi (FOSSIL) Fabre, 1940 †
Euomphaloceras costatum (FOSSIL) Cobban & al., 1989 † Brazil, Sergipe, Japaratuba
Metoicoceras crassicostae (FOSSIL) L.W. Stephenson, 1953 † Texas, Grayson County
Microsulcatoceras crassum (FOSSIL) J. Kennedy & Cobban,1990 †
Cunningtoniceras cunningtoni (FOSSIL) (Sharpe, 1855 †) Angola, Cuanza Sul, Sumbe
Tarrantoceras cuspidum (FOSSIL) L.W. Stephenson, 1953 † USA, Montana, Carter