4,, 



A GLOSSARY OF TERMS 



CLASSIFICATION. The act of form- 

 ing classes. An arrangement. 



CLAUSI'LIA. fr. lat. clausus, closed. 

 A genus of land shells, so named 

 because the aperture of the shell 

 is closed internally by a spiral 

 lid. (p. 40, Book v). 



CLA'VATE. Club-shaped ; larger at 

 top than at the bottom. 



CLAVELLA'TA. Lai. (fr. clavulus, a 

 little nail.) Marked by little pro- 

 jections or points; knotted. 



CLAVKi/LOSE.-Clubbed; having club- 

 like processes. 



CLAVICLE. fr. lat. clavis, a key. The 

 collar-bone. 



CLA VICOR'NES. fr. lat. clavus, a club ; 

 cor/m, horn. Name of a family 

 of insects. 



CLAVIGE'LLA. fr. lat. clavis, a nail. 

 A genus of* acephalous mollusks. 

 (p. 88, Book v). 



CLAW. The inferior part of a petal, 

 corresponding to the petiole of a 

 leaf. 



CLAY. An argillaceous rock of an 

 unctuous, soft, friable and dense 

 homogeneous structure, forming a 

 tenac-ious paste with water, and 

 of various colours. The varie- 

 ties of clay are essentially sili- 

 cates of alumina. Indurated clay 

 is a variety of trap rock. Kim- 

 meridge clay is a subdivision of 

 the upper oolite formation of a 

 blue or yellowish colour and more 

 or less slaty. Oxford clay, or 

 Clunrh day, .is a subdivision of 

 the middle o'olite formation, and 

 Weald flay is the upper portion 

 of the Wealden formation. 



CLAY-SLATK. A rock which resem- 

 bles clay or shale, but is gene- 

 rally di.~tiuguis.hed by its struc- 

 ture; the particles having been 

 re-arranged, and exhibiting what 

 is called slaty cleavage. It is 

 one of the metamorphic rocks. 



CLEAVAGE. The mechanical divi- 

 sion of the lamina of rocks and 

 minerals, to show the constant 



direction in which they may be 

 separated. 



CLEFT. A space made by the sepa- 

 ration of parts ; a crack ; a cre- 

 vice. The line of separation be- 

 twixt the two mandibles of bird i 

 shows to what distance the beai 

 is cleft from its point. 



CLEODO'IIA. Name of a genus ol 

 pteropod mollusks. fp. 67, Book v) 



CLiNA'NimiVM. That part of the 

 column of on hideous plants in 

 which the anther lies. 



CLINKSTONE. See pho'nolite. 



CLIO. fr. gr. kleos, glory. A genus 

 of pteropod mollusks. (p. 67, 

 Book v). 



CLO'ACA. Lat. A common sewer; 

 fr. gr. Ar/uzo, I wash. The pouch 

 at the extremity of the intestinal 

 canal, in which the solid and li- 

 quid excretions are commingled 

 in birds, fishes, and reptiles. 



CLO'STRES. Fr. Elongated, spindle- 

 shaped cells. 



CLOVES. Small bulbs developed at 

 the base of parent bulbs. 



CLU'PEA. Lat. A herring; a shad 



CLUPKJB. Lat. plur. of clupea. 



CLUSTKR. When flowers are borne 

 on a common, irregularly branch- 

 ed peduncle, they form a cluster. 



CLYME'NIA. fr. gr. klumenon, the 

 marigold ? A genus of fossil ce- 

 phalopods of the Devonian sys- 

 tem, with a chambered shell ana- 

 logous to that of the ammonite, 

 (p. 33, Book viii), 



CLY'PEATE. Scutate ; scutiform. 

 Applied to the scales found on 

 the leaves of certain plants. 



CLY'PEIFORM. fr. lat. clypeus, a 

 shield ; forma, shape. Shield- 

 shaped. A term applied to the 

 large prothorax in beetles. 



CLY'PEUS. Lat. A buckler. Name 

 of that part of the head of insects 

 to which the labrum is attached. 



COA'DNATE. 

 COAII UNATE. 



COAI A combustible mineral, con- 



