CHRYSODOMUS. Swains. "Distinguished from Fusus, by the comparative shortness of the basal channel, and the ventricose or enlarged shape of the body whorl. The beautiful orange-mouthed Whelk of England is a typical example; and the few others now known are all of a very large size, and chiefly found in Northern Seas, where they represent the more elegant Fusi of tropical latitudes; the outer lip is always thin and smooth." Sw. page 90, paragraph 78, described at page 308. CHRYSOLUS. Montf. POLYSTOMELLA, Bl. A genus of microscopic Foraminifera. CHRYSOSTOMA. Sw. A genus of the family "Rotellinæ," Sw. Thus described "Shell turbinate; the whorls few and convex; aperture effuse, round; inner lip thickened just over, and almost concealing the umbilicus. Nicobaricus, Martini, 182 fig. 1822-5." Sw. Lard. Cyclop. Malac. p. 327. CHTHALAMUS. Ranz. _Fam._ Balanidea, Bl. Order, Sessile Cirripedes, Lam.--_Descr._ "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 horizontal 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, petholatus, and other similar species. The word Cidaris is, however, already in use for a genus of Echinæ. CIDAROLLUS. Montf. A genus of microscopic Foraminifera. CILIATED. (ciliæ, 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_, Pedunculated Cirripedes, Lam.--_Descr._ 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.