GLOSSARY OF TECHNICAL TEEMS xix 



CHROMATOPHORES (Gr. XP^M**, colour; <f>opevs, carrier)? proteid 

 bodies (contained within cells) in which colouring matter is 

 deposited. 



CHROMOMERES (Gr. XP^M a > colour ; pepos, part), the constituent 

 parts of chromosomes (#.r.); termed by Weismann "ids." 



CHROMOSOMES (Gr. XP^M, colour ; o-co/txa, body), definite aggrega- 

 tions of chrornatin which appear during mitotic nuclear 

 division ; termed by Weismann " idants." 



CILIA (Lat. cilium, eyelash), hair-like protoplasmic projections 

 from the surface of a cell, which have the power of rapid, 

 co-ordinated vibration. 



CLAVICLE (Lat. claricula, small key), one of the bones of the 

 shoulder girdle, the collar-bone in man. 



CLEAVAGE, the division of the developing egg into undifferentiated 

 cells or blastomeres. 



COCCYX (Gr. KOKKV, cuckoo), the lower end of the vertebral 

 column in man. 



CCELENTERATE (Gr. KotAov, cavity ; tvrcpov, gut), the term applied 

 to those animals (Coelenterata) in which there is only one 

 cavity in the body, the enteron or digestive cavity. 



CCELOM (Gr. KOI\OV, cavity), the body cavity, which lies between 

 the gut and the body wall in ccelomate animals. 



CQSLOMATE, possessing a body cavity or coBlom (y.?.-A 



COLLOIDS (Gr. /co'AAa, glue), gummy~substances which will not 

 diffuse through organic membranes. 



CONGENITAL (Lat. congenitatis, present at birth), a term applied 

 to characters present at birth (but not necessarily 

 blastogenic). 



CONJUGANT (Lat. conjugare, to join together), one of two "con- 

 jugating" individuals (in Paramoecium, &c.). 



CONJUGATION (Lat. conjugare, to join together), the union of two 

 sexual cells or gametes to form a zygote, which is capable of 

 developing into a new individual (the term is sometimes 

 limited to cases of isogamy, but is used in this work in a more 

 general sense). 



CONVERGENCE, the acquisition, by different organisms, of similar 

 form or structure as the result of a similar mode of life, 

 and not as the result of inheritance from common 

 ancestors. 



CORACOID (Gr. Kopa, raven ; etSoj, form ; anything hooked like a 

 raven's beak), one of the bones of the typical shoulder girdle 



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