CAY 



[ 76 ] GEL 



ish-brown, reddish-brown, and 

 greyish-white, with intermediate 

 shades. The finest specimens are 

 brought from Ceylon. Cat's-eye is 

 harder than quartz, and consists of 

 silex 95, alumine 1'75, lime 1*25, 

 oxide of iron 0-25. 



CATAEHINI. A family of the order 

 Quadrumana, comprising the mon- 

 keys of the old world. 



CATILLUS. A genus of bivalve couchi- 

 fera, considered by some authors to 

 be identical with Inoceramus, but 

 is separated by M. Deshayes for 

 reasons apparently conclusive; it 

 is oval or oblong, nearly equivalve, 

 inequilateral, the umbones being 

 more or less prominent, the hinge 

 is straight, nearly perpendicular to 

 the longitudinal axis, its border 

 being furnished with a series of 

 small cavities; the shell is very 

 thick, sometimes of enormous di- 

 mensions, being mentioned as 

 attaining many feet in length ; the 

 structure of the test is fibrous. The 

 white chalk of France and England 

 has produced all the known species. 

 Lycett. 



CATO'DON. A name given to the 

 spermaceti whale. Of the genus 

 Catodon, Ray mentions a large one 

 stranded on the coast of Holland. 



CATOCY'STI. The second great di- 

 vision, or family, of Echini. The 

 catocysti have the opening for the 

 vent in some part of the base of the 

 shell ; they are divided into fibu- 

 lae, cassides, scuta, and placentae. 



CAifDA. (Lat.) In conchology, the 

 elongated base of the ventre, lip, 

 and columella. 



CATT'DEX. (Lat.) The stock or trunk, 

 the stem or body of a tree. 



C'AVEBNOUS (cavernosus, Lat. caver - 

 nem, Fr. cavernoso, It.) Full of 

 caverns and hollows. 



CAWK. A name for sulphate of 

 barytes. 



CA'YMAN. The name assigned to a 

 sub-genus of crocodiles. Authors 

 are not agreed as to the origin of 



this name ; Rochefort says it was 

 original with the native islanders 

 of the Antilles. 



CELA'CANTH. Hollow spine. A family 

 of fossils of the old red sandstone, 

 deriving their name of hollow- 

 spine from this peculiarity. Hugh 

 Miller. 



CELE'STINE. Sulphate of strontia, or 

 sulphate of strontites. It has 

 obtained the name of celestine from 

 being frequently found possessing 

 a blue colour ; but as it does not 

 invariably possess that colour, and 

 is often found either colourless or 

 red, the name appears to be inap- 

 propriate. It occurs both massive 

 and crystallised. It is composed 

 of 58 parts of strontia, and 42 of 

 sulphuric acid. It is found in 

 Scotland, in Yorkshire, and in 

 Somersetshire, near Bristol; also 

 in the neighbourhood of Paris, and 

 in Sicily, from which last place 

 we obtain the finest specimens. 



CELLEPO'EA. Animals belonging to 

 the class Yermes, order Zoophytes. 

 Generic characters : Animal an 

 hydra or polype ; coral somewhat 

 membranaceous, composed of cells. 

 Species : The principal species are 

 the Cellepora pumicosa, annulata, 

 spongites, &c. Crall. 



CELLEPO'EITE. A fossil cellepora. 

 Seven species of celleporites have 

 been determined by Goldfuss as 

 belonging to the organic remains of 

 the cretaceous group : two other 

 species are found occurring in the 

 oolite, and two distinct species in 

 the grauwacke. Fossil celleporae 

 may be distinguished from fossil 

 flustrae, by their cells being urceo- 

 lated and irregularly placed, and 

 by the constricted appearance of 

 their mouths. 



CE'LLULAE MEMBEANE. In anatomy, 

 that tissue of filmy meshes which 

 connects the minute component 

 parts of most of the structures of 

 the body. 



