CLAUSILIA. Ill 



Author (No. 12) contains sixteen species. Circe pectinata and 

 C. scripta, represent tlie two groups. Circe scripta, PL xxvii. 

 fig. 577. 



CIEEIPEDES. Lam. The tenth class of invertebrated animals, 

 so named from the curled and ciliated branchia which protrude 

 from the oval aperture of the shells. The class Cirripedes of 

 Lamarck constitutes the entire genus Lej)as of Linnseus. They 

 are divided into two sections ; first, Sessile Cirr. attached by the 

 basal portion of the shell; second, Pedunculated Cirr. supported 

 upon a peduncle. Eigs. 14 to 45. 



CIEEOBEANCHIATA. Bl. The first order of Paracephalo- 

 phora Hermaphrodita, Bl, This order has been formed for the 

 piirpose of giving a place in the system to the genus Dentalium. 

 The animal of which has lungs, consisting of numerous filaments, 

 having their basal origin in two radical lobes under the dock. 



CIEEUS. J. Sowerby (cirrus, a tendril.) Fam. Turbinacea, Bl. 

 and Lam, — Descr. Spiral, conical, with a hollow axis ; whorls 

 contiguous, numerous, rounded, or slightly angulated. — Obs. 

 This fossil genus resembles Trochus, from which it is known by 

 the deep funnel-shaped umbilicus. C. nodosus. PI. xvi. fig. 349. 



CISTULA. Humph. Part of Ctclostoma, Lam. C. fimbriata. 

 See Thesaurus ConchyKorum. 



CLANCULUS. Montf. 1810. Teochtjs Pharaonis, luam.—Obs. 

 This, with several other species, belong more properly to MoNO- 

 DONTA, Lam. Odontis, Sow. PI. xvi. fig. 361. 



CLATHODON. Conrad. Gnathodon, Gray. 



CLATHEUS. Oken, 1815. The species of Scalaria, which have 

 the whorls contingent. Ex. Scalaria Clathrata. 



CLATJSILIA. Drap. 1805. {Clausium, a valve or folding door.) 

 Colimacea, Lam. Limacinea, Bl. — Descr. Spire elongated, con- 

 sisting of many volutions ; aperture small, sub- quadrate, having 

 several tooth-shaped folds in the columella. A small, elastic, 

 shelly plate, attached to the columella within, called the Clau- 

 sium, its office being to enclose the aperture when the animal 

 has retired within the shell. — Obs. This last character distin- 



