Camaena contractiva (J.F. Mabille, 1889)
Amphidromus contrarius (O.F. Müller, 1774)
Amphidromus contrarius concolour E.C. Von Martens
Amphidromus contrarius hanieli B. Rensch, 1931
Amphidromus contrarius nikiensis B. Rensch, 1931
Amphidromus contrarius suspectus (E.C. Von Martens, 1864)
Rhagada convicta (J.C. Cox, 1870)
Sphaerospira cookensis (J.W. Brazier, 1875)
Sinumelon cooperi B.C. Cotton, 1940
Chloritis cordieri A.R.J.B. Bavay& P. Dautzenberg, 1909
Badistes corneovirens (L. Pfeiffer, 1851)
Badistes corneovirens minor J.C.H. Crosse, 1864
Planispira cornicula J.B. Hombron& C.H. Jacquinot, 1842
Nanotrachia coronata F. Köhler & F. Criscione,2013
Retroterra costa G.A. Solem, 1985
Amphidromus costifer E.A. Smith, 1895
Eurytrachia costulata J. Stanisic & D.G. Potter,2010
Nanotrachia costulata F. Köhler & F. Criscione,2013
Turgenitubulus costus G.A. Solem, 1981
Basedowena cottoni T. Iredale, 1937
Ganesella coudeini A.R.J.B. Bavay& P. Dautzenberg, 1900
Gloreugenia coxeni (J.C. Cox, 1871)
Thersites coxi J.C.H. Crosse, 1866
Papuina coxiana G.F. Angas, 1867
Trachia crassicostata (W.H. Benson)
Australocosmica crassicostata F. Criscione & F. Köhler,2013
Chloritis crassula R.A. Philippi, 1844
Kimberleytrachia crawfordi (G.A. Solem, 1979)
Arnemelassa creedi (J.C. Cox, 1868)
Labyrinthus creveauxianus (C.M.F. Ancey, 1890)
Polydontes crispata (A.E.J. Férussac, 1821)
Satsuma cristata H.A. Pilsbry, 1902
Thersites croftoni (J.C. Cox, 1872)
Kimberleytrachia crucis F. Köhler, 2011
Calycia crystallina (L.A. Reeve, 1848)