Bicarina coluber (FOSSIL) (J. Perner, 1903 †)
Euryzone comatula (FOSSIL) J. Perner, 1907 †
Tylozone commensurata (FOSSIL) E.G. Linsley, 1968 †
Tropidostropha compta (FOSSIL) Batten, 1966 †
Baylea concentrica (FOSSIL) (B. Phillips, 1836 †)
Dictyotomaria concinna (FOSSIL) Hoare & al., 1997 †
Pleurorima confertinemilata (FOSSIL) Fagerstrom, 1961 †
Angyomphalus congletonensis (FOSSIL) Peel, 2016 †
Ananias conglobata (FOSSIL) (J. Wanner, 1922 †)
Campbellospira conica (FOSSIL) E.K. Yoo, 1994 †
Euconospira conica (FOSSIL) (B. Phillips, 1836 †)
Platyteichum coniforme (FOSSIL) (Jack & R. Etheridge jr.,1892 †)
Spiroscala conoides (FOSSIL) (F.B. Meek& A.H. Worthen, 1867 †)
Euconospira conula (FOSSIL) (J.W. Hall, 1856 †)
Cataschisma convexa (FOSSIL) Longst, 1924 †
Guizhouspira convexa (FOSSIL) Wang, 1980 †
Arctozone cooki (FOSSIL) Frýda & Blodgett, 2004 †
Baylea cordulae (FOSSIL) Heidelberger & al.,2009 †
Liraloron cornoviorum (FOSSIL) Peel, 2016 †
Glabrocingulum coronatum (FOSSIL) Chronic, 1952 †
Glabrocingulum coronulum (FOSSIL) Jeffery & al., 1994 †
Lunulazona costata (FOSSIL) Sadlick & C. Nielsen,1963 †
Stenozone costatiformis (FOSSIL) Swart, 1998 †
Lahnospira costatofasciata (FOSSIL) (C.L.F. von Sandberger,1842 †)
Platyteichum costatum (FOSSIL) G.B. Campbell, 1953 †
Pandospira costellata (FOSSIL) (C. Gemmellaro, 1889 †)
Breizospira crozonensis (FOSSIL) Blodgett & al., 1999 †
Spiroraphe cryptata (FOSSIL) (Billings, 1866 †)
Euconospira cryptolirata (FOSSIL) Chronic, 1952 †
Mourlonia cuneoi (FOSSIL) Ferrari & Sabattini,2008 †
Pleurorima cytherea (FOSSIL) (J. Perner, 1903 †)
Gosseletina dangchangensis (FOSSIL) Tong & Erwin, 2001 †
Nodulispira danmianshanensis (FOSSIL) Pan & Cook, 2003 †
Dictyotomaria decora (FOSSIL) Hoare & al., 1997 †
Spiroscala decorata (FOSSIL) Hoare & al., 1997 †