372 PRINCIPLES OF ANIMAL BIOLOGY 



Chordata (korda'ta). A phylum of animals including the vertebrates and a few- 

 others. For definition see Chapter XII. 



Chorophilus (ko rof i lus). A genus of frogs. 



Chromatic figure {kro mat' ik). That part of a mitotic figure which stains deeply, 

 namely, the chromosomes, as distinguished from the spindle. 



Chromatin [kro' matin). The deeply staining substance of the nucleus of a cell, 

 attached to or imbedded in the linin network. 



Chromomere {kro' mo rneer). One of the small aggregations of chromatin and 

 other substances collectively forming a chromosome. 



Chromoplast {kro' mo plast). One of several kinds of colored structures or organs 

 found in many plant and some animal cells. 



Chromosome {kro' mo some). One of the rod-like or rounded bodies into which the 



chromatin of a nucleus is resolved at the time of cell-division. 

 Chrysemys {kris' e mis). A genus of turtles. 



Chyme {kime). The fluid containing partly digested food found in the stomach. 

 Cicindela {sis' in dee' la). A genus of tiger-beetles. 

 Ciliary (si/' ^' a n). Pertaining to cilia. 



Ciliata {siV i a' to). A subclass of the Infusoria (Protozoa), in which both young and 

 adult stages are provided with cilia. 



Ciliate {siV i ate) or ciliated. Provided with ciUa, 



Cilium {siV i um). A minute hair-like motile structure occurring on the surface of 

 certain cells. 



Circular canal (se/ ku lev ka naV). A channel passing around a medusa near its 

 margin. 



Circulation {ser' ku la' shun). The movement of the blood through a system of 

 vessels. 



Circumpharyngeal connectives {ser' kumfa rin' je at). Nerve cords in the earthworm 

 connecting the brain with the ventral nerve cord; so called because they pass 

 around the anterior end of the pharynx. 



Cirrus (approximately seer' us) {pi., cirri). A soft tentacle-like projection. Also, 

 a copulatory organ in some animals. 



Class {klas). A subdivision of a phylum; a group of higher rank than the order. 



Clavicle {klav' i k'l). The collar bone in man. One of the bones of the ventral part 

 of the pectoral girdle in vertebrates in general. 



Cleavage {kleev' aj). The division or segmentation of an egg. 



Clitellum {kli teV lum). A thickened glandular band encircling the body of an earth- 

 worm. 



Cloaca {klo a' ka). A common passage-way through which the intestine, kidneys, and 

 sexual organs discharge their products in some fishes, in amphibia, reptiles and 

 birds, and in a few mammals. 



Coccidae {kok' si dee). A family of scale insects. 



Coccidium schubergi {kok sid' i um shu' berg i). A species of parasitic protozoon, 



one of the Sporozoa. 

 Cocoon {ko koon'). A case in which eggs are stored and in which frequently the 



larvae are developed; also a silky covering around the pupa. 



Codosiga {ko' do si' ga). A genus of flagellate Protozoa having a collar around 

 the flagellum. 



