CIONELLA. 107 



CHTHALAMUS. Ranz. Fam. Balanidea, Bl. Order, Sessile 

 Cirripedes, Lam. — Bescr. " Shell much depressed, valves thick, 

 thickened at the base, with prominent areas ; operculum nearly 

 horizontal, composed of four valves." — Obs. This description 

 would apply generically to the shell called Platylepas in the 

 British Museum, only nothing is said about the prominent plates 

 jutting from the internal surface of the valves. The difference 

 between this genus and Balanus consists principally in the hori- 

 zontal position of the operculum, and general flatness of the shell. 

 C. stellatus, fig. 18. 



CIBICIDES. Montf. A genus of microscopic Foraminifera. 



CIDARIS. Swains. A genus composed of Turbo Smaragdus, pe- 

 tholatus, and other similar species. The word Cidaris is, how- 

 ever, already in use for a genus of Echinae. 



CIDAROLLUS. Montf. A genus of microscopic Foraminifera. 



CILIATED, (ciliee, hairs.) Having minute hairs as in Orbicula, 

 Lingula, &c. and the jointed feelers of the Cirripedes. 



CIMBER. Montf. Navicella, Auct. 



CINERAS. Leach. (Cinereus, ash-coloured.) Order, Peduncu- 

 lated Cirripedes, Lam. — Bescr. Animal with a quadrilateral 

 body, supported on a fleshy peduncle, with an opening in front 

 of the upper part for the passage of a bunch of ciliated tentacula. 

 Immediately above this aperture is a pair of small elongated 

 valves, placed in a nearly horizontal position ; at the lower part 

 is another tripartite pair placed perpendicularly, one on each side, 

 and a narrow, angulated, keel-shaped piece placed at the back. — 

 Obs. The nearest approach to this genus is Otion. (C. Vittatus, 

 fig. 42.) Found upon substances floating in the sea. 



CINEREOUS. (Cinereus) Ash-coloured. 



CINGULA. Fleming. Rissoa, Leach. 



CIONELLA. Jeffreys. Fam. Colimacea, Lam. — Bescr. Oblong 

 or elongated; last whorl large; apex rather acute; columella, 

 sub-interrupted; aperture canaliculated, sub-effuse at the base; 

 margins very unequal; no umbilicus. Bulinus octonus, lubri- 

 cus, acicula, &c. Auct. C. lubrica, fig. 285. 



