822 Appendix 



Centriole (sen' tri ol) (L. centrum, center), small central granule of most centro- 



somes. 

 Centrosome (central body) (sen' tro som) (L. centrum, center; soma, body), the 



body enclosing the centriole and located in the center of the aster during 



mitosis. 

 Centrosphere, see Centrosome. 



Cephalic (se -fal' ik) (Gr. kephale, head), pertaining to the head. 

 Cephalization (sef al i -za' shun), development of larger head and brain in higher 



animals. 

 Cephalochordata (sef a lo kor -da' ta) (Gr. kephale, head; chorde, chord), a sub- 

 phylum of the phylum Chordata in which the notochord is confined to 



the temporary tail of the larva. 

 Cephalopoda (sef a -lop' o da) (Gr. kephale, head; pous, foot), certain moUusks 



with muscular, sucker-bearing "arms" on the head region. 

 Cephalothorax (sef a lo -tho' raks) (Gr. kephale, head; thorax, chest), head fused 



with the thorax. 

 Cercaria (ser -ka' ri a) (Gr. kerkos, tail), tailed larva of a fluke. 

 Cerebellum (ser e -bel' um) (L. dim. of cerebrum, brain), the part of a vertebrate 



brain dorsal and anterior to the medulla. 

 Cerebrum (ser' e brum) (L. cerebrum, brain), anterior hemispheric part of a 



vertebrate brain. 

 Cervical (sur' vi kal) (L. cervix, neck), pertaining to the neck. 

 Cestoda (ses -to' da) (Gr. kestos, girdle), a tapeworm. 

 Chaeta (ke' ta) (Gr. chaite, hair), spine or bristle. 



Chalone (kal' on) (Gr. chalinos, depress), a hormone which depresses activity. 

 Chelicera (ke lis' era) (Gr. chele, claw; keras, horn), the most anterior pair of 



appendages of the spider, scorpion, king crab. 

 Cheliped (ke'liped) (Gr. chele, claw; pous, foot), pincerlike appendage on the 



thorax of crayfish and allies. 

 Chemosynthesis, manufacture of foods by certain bacteria which use energy 



derived from chemical reactions such as the oxidation of ammonia, sulfur, 



etc. 

 Chemotaxis (chemotropism) (kem o -tax' is; ke mot' ro pizm) (Gr. chemo, chemi- 

 cal or juice; taxis, reaction) (Gr. trophe, turning), the simple response 



(either positive or negative) to chemical stimuli. 

 Chilopoda (ki -lop' o da) (Gr. cheilos, lip; pous, foot), centipedes. 

 Chitin (ki' tin) (Gr. chiton, covering), outer, horny covering of insects, Crus- 

 tacea, etc. 

 Chiton, a mollusk (class Amphineura) with a shell made of eight dorsal plates. 

 Chlamydospore (klam -id' o spor) (Gr. chlamys, mantle), a thick-walled, resting 



spore in certain fungi. 

 Chloragogen cells (klo ra -gog' en) (Gr. kloros, green; ago, lead) cells on the outer 



surface of the earthworm intestine. 

 Chlorophyta (klor -of i ta) (Gr. chloros, green; phyta, plants), green algae. 

 Chlorophyll (klo'rofil) (Gr. kloros, green; phyllon, leaf), the green pigment of 



many plants. 

 Chlorophyllogen (klo ro -fil' o jen) (Gr. kloros, green; phyllon, leaf; gen, to form), 



the plant material from which chlorophyll is formed. 



