Calycoceras boreale (FOSSIL) A. Hyatt 1900 †
Calycoceras boreale (FOSSIL) Kennedy Cobban & Landman,1996 †
Nigericeras bulbosum (FOSSIL) (Reyment, 1954 †)
Protacanthoceras bunburianum (FOSSIL) Sharpe, 1853 †
Acompsoceras calabarense (FOSSIL) Zaborski, 1985 †
Kamerunoceras calvertense (FOSSIL) Powell, 1963 †
Calycoceras canitaurinum (FOSSIL) (F. Haas, 1949 †)
Mantelliceras cantianum (FOSSIL) Spath, 1926 †
Mantelliceras charlestoni (FOSSIL) Kellum & Mintz, 1962 †
Acanthoceras chasca (FOSSIL) Benavides-Caceres, 1956 †
Spathites chispaensis (FOSSIL) Kummel & Decker, 1954 †
Utaturiceras chrysanthemum (FOSSIL) E. Matsumoto & al.,2003 †
Dunveganoceras clowi (FOSSIL) Warren & Stelck, 1955 †
Burroceras clydense (FOSSIL) Cobban,Hook & J. Kennedy, 1989 †
Spathites coahuilaensis (FOSSIL) (Jones, 1938 †)
Watinoceras cobbani (FOSSIL) M. Collignon, 1966 †
Mantelliceras cobbani (FOSSIL) Amédro, 1993 †
Eucalycoceras collignoni (FOSSIL) (Fabre, 1940 †)
Pseudaspidoceras collignoni (FOSSIL) Cobban & P.H. Scott,1972 †
Watinoceras coloradoense (FOSSIL) (Henderson, 1908 †)
Watinoceras coloradoense praecursor (FOSSIL) Wright & J. Kennedy,1981 †
Jeanrogericeras combesi (FOSSIL) Sornay, 1951 †
Acanthoceras compitalis (FOSSIL) Stoyanow, 1949 †
Protacanthoceras compressum (FOSSIL) (Jukes Browne, 1896 †)
Mammites conciliatum (FOSSIL) (F. Stoliczka, 1865 †)
Dunveganoceras conditum (FOSSIL) F. Haas, 1951 †
Sumitomoceras conlini (FOSSIL) Wright & J. Kennedy 1981 †,
Mitonia constricta (FOSSIL) Renz, 1982 †
Cunningtoniceras cookense (FOSSIL) Cobban,Hook & J. Kennedy, 1989 †
Mantelliceras corroyi (FOSSIL) Fabre, 1940 †
Euomphaloceras costatum (FOSSIL) Cobban & al., 1989 †
Metoicoceras crassicostae (FOSSIL) L.W. Stephenson, 1953 †
Microsulcatoceras crassum (FOSSIL) J. Kennedy & Cobban,1990 †
Cunningtoniceras cunningtoni (FOSSIL) (Sharpe, 1855 †)
Tarrantoceras cuspidum (FOSSIL) L.W. Stephenson, 1953 †