INDEX-GLOSSARY. 367 



Chromatophore (xfS/ice, xptafiaT-, colouring matter ; </>o % oos, bearing; <t>epw, 

 I bear) A pigment-bearing cell, 178. 



Cilium (dl'mm, an eyelash) A short vibratile thread of protoplasm on the 

 free surface of a cell, 13, 61, 312. 



Circulatory system Lumbricus, 59; Hirudo, 78; Astacus, 97; Anodonta, 

 Unio, 114; Helix, 127; Amphioxus, 142; Scy Ilium, 161; Rana, 194; 

 202; Tadpole, 227; Columba, 245; Chick, 267; Lepus, 289; Homo, 

 331 ; Comparison of, 314. 



Cirrus, in Distoma and Ttenia The penis, 32, 42 ; buccal c., 136. 



Cirrus-sac, 33. 



Clasper, 154, 167. 



Classification of Animals, 1, 3; Chap. xv. , 339. 



Claw, 176, 230, 241. 



Cleavage (Segmentation) The early stages of cell division occurring in a 

 developing oosperm, 26, 67, 105, 147, 222, 256, 306. 



Clefts, visceral, in Chordata Lateral apertures by which the pharynx com- 

 municates with the exterior, 3, 157, 225, 226, 262, 308. 



Clepsidrina, 18. 



Climate, 348. 



Clitellum (clitella;, a pack-saddle), 55, 64, 76. 



Clitoris, 299. 



Cloaca (cloaca, a sewer) The chamber into which the intestine, genital, 

 and, usually, urinary ducts open, 48, 49, 160, 191, 242. 



Cnemial crest, 290. 



Cnidoblast, 22. 



Cnidocil, 22. 



Coagulation, 165. 



Coats, of Alimentary canal, 192, 244, 288 ; of Artery, 202. 



Coccyx, 326. 



Cockroach, 18. 



Cocoon, 82. 



Cochlea (cochlea, a snail-shell) A posterior outgrowth from the mem- 

 branous labyrinth, coiled in higher forms, 173, 219, 256, 304. 



Cod, 153. 



Ccelenterata, 340; Chap, ii., 19. 



Ccelom (/coIXos, hollow) A body cavity which typically (1) does not contain 

 blood, (2) communicates at some period with the exterior by excretory 

 tubes, (3) has parts of its lining thickened into gonads, (4) arises early 

 in development, 56, 60, 79, 95, 143, 150, 191, 248, 263. 



Coelomata, 340. 



Ccenurus, 46. 



Collozoum, 339. 



