824 Appendix 



Coccus (kok' us) (Gr. kokkus, berry), spherical, unicellular organism. 



Cochlea (kok' lea) (Gr. kochlias, snail), spirally coiled part of the inner ear, 



containing receptors for hearing. 

 Cocoon (ko-koon') (L. concha, shell), the enclosed stage of certain insects in 



which the pupa enters the cocoon and the adult emerges from it; e^g case 



of spiders and earthworms. 

 Coelenterata (se lent er -a' ta) (Gr. koilos, hollow; enteron, digestive tract), 



phylum of animals having a hollow digestive tract as Hydra, Obelia, etc. 

 Coelom (coelome) (se' lum) (Gr. koilos, hollow), a hollow true body cavity con- 

 taining organs. 

 Coelomization (se lom i -za' shun), presence of a true body cavity (coelom) be- 

 tween the body wall and the digestive tract formed from mesoderm. 

 Cohesion (ko -he' shun) (L. cohaerere, to stick), attraction whereby particles 



(molecules) of a body are united throughout a mass (attract each other). 

 Cold-blooded, body temperature varies with the environment. 

 Coleoptera (ko le -op' tera) (Gr. coleos, sheath, ptera, wings), order of insects 



with hard, chitinous wings, such as beetles and weevils. 

 Collar cell (choanocyte), cells with a collarlike structure on the surface as in 



sponges. 

 Collembola (kol -em' bo la) (Gr. kolla, glue; embolon, rod), wingless insects such 



as springtails. 

 Colloid (kol' oid) (Gr. kolla, glue), a finely divdded matter suspended or dispersed 



through some continuous medium. 

 Columnar (kol -lum' nor) (L. column, column), column shaped. 

 Combination, an inherited variation due to the combining of genes from parents. 

 Combustion (L. combustio, burn), rapid oxidation of a chemical substance. 

 Commensalism (kom -men' sal izm) (L. com, with; mensa, table), an association 



of members of two or more species (not truly parasitic) which live in, or 



on, or with each other, usually partaking of the same food. 

 Commissure (kom'ishoor) (L. commisura, join together), a circle of nervous 



tissue to connect various regions as in earthworms, snails, insects, etc. 

 Companion cell, one which usually accompanies seive tubes in phloem tissues of 



plants. 

 Complementary factors, two or more dissimilar factors (genes) which interact 



and complement to produce a particular trait. 

 Compound, a substance made of two or more elements in chemical union. 

 Compound eye, one made of numerous units called ommatidia, as in certain 



arthropods. 

 Condyle (kon' dil) (Gr. kondylos, knuckle), rounded process for articulation of a 



bone. 

 Congenital (kon -jen' i tal) (L. con, together; gigno, to bear), present at birth. 

 Conidia (ko -nid' i a) (Gr. konis, dust), small spores formed by constricting hyphae. 

 Conidiophore (ko -nid' i o for) (Gr. konis, dust; phoreo, to bear), structure which 



bears conidiospores. 

 Conidiospore (conidium) (ko -nid' i o spor) (Gr. konis, dust; sporos, spore), spore 



formed by constricting the tip of a hypha as in certain molds. 

 Conjugation (kon joo -ga' shun) (L. con, together; jugare, to join), temporary 



union of two cells to exchange nuclear materials. 



