426 



I1VDEX. 



long prehensile processes or feet 

 project from the head, xxii, 663, 

 673. 



Cephal'o-tho v rax (Gr. Ke^aXrj, head ; ! 

 Lat. thorax, chest), the anterior j 

 division of the body in spiders, 

 scorpions, &c., which consists of 

 the head and chest blended to- 

 gether. 



Cerca'ria, alternate generation exem- 

 plified in the, 520524. 



Cerca'ria} (Gr. Kfpicoc, a tail), ani- 

 malcules whose body is termi- 

 nated by a tail-like appendage. 



Cerebellum, or little brain,inman,87. 



Cer'ebral nerves, 97114. 



Cer'ebrum, or brain, in man, 86. 



Cestra v cion Phil'lipii, a living repre- 

 sentative of the fishes of a former 

 age, 615. 



Ceta x cea, or Cetaceans (Lat. cete, a 

 whale), marine animals, which nurse 

 their young, like the whale, por- 

 poise, &c., xxi. 304. 



ChahVza, the albuminous thread by 

 which the yolk of the egg is sus- 

 pended, 446. 



Chalk formation, 650. 



Chart of zoological regions, 595 

 622. 



Chelo'nia (Gr. ^t\Mvn, a turtle), the 

 order of reptiles including the tor- 

 toises and turtles, xxi. 



Che'le (Gr. \rj\i], a claw), applied 

 to the bifid claws of the crusta- 

 cea, scorpions, &c. 



Chick, development of the, first 

 period, 482 485; second period, 

 486492 ; third period, 493 

 497 ; birth, 498 ; physical and 

 chemical changes in the egg du- 

 ring incubation, 499. 



Chil'ognatha (Gr. \ti\og, a lip ; 

 yvaQoQ, a jaw), the order of many- 

 footed insects, typified by the 

 gally-worm or julus. 



Chi'tine (Gr. %iroi', a coat), the pe- 

 culiar chemical principle which 

 hardens the integument of insects. 



Chol'edochus (Gr. 



doxe, receptacle), the tube form- 

 ed by the union of the hepatic 

 and cystic ducts. 



ChoVion, from the Greek word sig- 

 nifying the membrane which en- 

 closes the foetus, and applied ge- 

 nerally to the outer covering of 

 the ovum, 475. 



Cho v roid, one of the coats of the eye, 

 124. 



Chrys'alis (Gr. xpvvos, gold), the 

 stage of the butterfly immediately 

 preceding its period of flight, when 

 it is passive, and enclosed in a 

 case, which sometimes glitters 

 like gold. 



Chyle (Gr. ^uXoc, juice), nutrient 

 fluid extracted from digested food 

 by the action of the bile, 333. 



ChylificaHion, 332. 



Chyme (-^V^LOQ, juice), digested 

 food which passes from the sto- 

 mach into the intestines, 331. 



Chymifica'tion, 331. 



Cil'ia (Lat. cilium, an eye-lash), mi- 

 croscopic hair-like bodies, which 

 cause, by their vibratile action, 

 currents in the contiguous fluid, 

 or a motion of the body to which 

 they are attached, 216. 



Cil'iary motions, 211, 216, 217. 



Cilia v ted, provided with vibratile cilia. 



CiliobrachiaHa (Lat. cilium, an eye- 

 lash ; Gr. fi(>a%ioi>, the arm), po- 

 lyps, in which the arms are pro- 

 vided with vibratile cilia. 



Ciliogrades x (Lat. cilium, an eye- 

 lash ; gradior, I walk), acalepha? 

 which swim by the action of cilia. 



Circulation, the, 350 375; its 

 course in the mammalia, 364, 

 365 ; in reptiles, 366 ; in fishes, 

 367 ; in mollusca, 368 ; in crus- 

 tacea, 369 ; in insects, 370 ; in 

 cold-blooded animals, 373. 



Cir'ri (Lat. cirrus, a curl), curled 

 filamentary appendages, as the feet 

 of the barnacles. 



