374 PRINCIPLES OF ANIMAL BIOLOGY 



Cornea (kor* ne a). The transparent bulging membrane at the front of the eye. 



Corpora adiposa (kor' po ra ad' i po' sa). Fat-bodies, storage places for reserve fatty 

 food. 



Cortex (kor' teks). The layer of gray matter which covers the cerebrum and dips into 

 its folds. Also, an outer layer on various other organs. 



Costiform {kos' tiform). Rib-shaped. 



Cranial nerve (kra' ni al nerv'). One of ten or twelve pairs of nerves arising from 

 the central nerv^ous system within the skull. 



Cretaceous (kre ta' shus) . Pertaining to late Mesozoic time; so named from the 

 chalk deposits characteristic of it. 



Crinoidea (kri noi' de a). A class of Echinodermata, including the feather-stars and 

 sea-hlies. For definition see Chapter XII. 



Cristatella mucedo (kris' ta teV la mu se' do). A species of freshwater bryozoon. 



Crocodilini (krok' o di W ni). An order of Reptilia comprising the aUigators and 



crocodiles and their alUes. 

 Cro-Magnon {kro man' yon). A rather highly developed race of men preceding the 



principal races of today. It dwelt, as far as known, in western Europe. 



Crop (krop). In the earthworm, an enlargement of the digestive tract behind the 

 esophagus and in front of the gizzard. In birds, an enlargement of the esophagus 

 for the temporary storage of food. 



Crustacea (krus ta' she a). A class of arthropods including the lobsters, crabs, water 

 fleas, barnacles, etc. For definition see Chapter XII. 



Cryptobranchus (krip' to brang' kus). A genus of salamanders of large size. 



Crystalline lens (kris' tal lin lenz'). A rounded, transparent, refractive body situated 



behind the pupil of the eye. 

 Ctenophora (^e nof o ra). A phylum of animals including the comb jellies and sea 



walnuts. For definition see Chapter XII. 



Cubical epithelium (ku' bi kal). Epithelium in which the height and width of the cells 



are about equal. 

 Cuticle (ku' ti k' I) . Same as pellicle. Also same as epidermis. 



Cuvier, Georges (kii vyay'). French naturalist, founder of comparative anatomy, 



176^1832. 

 Cyclosis (si klo' sis). The rotation of protoplasm about the interior of a cell. 

 Cyclostomata (si klo sto' ma ta) . A class of Vertebrata having an eel-like form, a 



cartilaginous skeleton, no jaws, and no lateral fins; lampreys and hagfishes. 



Cynipidae (si nip' i dee). A family of gall-producing insects of the order Hymenop- 

 tera. 



Cyst (sist). Any enveloping structure, usually a secreted membrane. 



Cytoblastema (si' to bias' te ma). The name given to a supposed formative or nutri- 

 tive substance in organisms, from which cells were early thought to be formed. 



Cytology (si toV oji). The science which deals with the structure of cells. 



Cytoplasm (si' to plaz'm). The protoplasm of a cell exclusive of the nucleus. 



Dace (dase) . One of several small species of fish . 



Darwin, Charles (dar' win). Celebrated English naturalist, founder of the doctrine of 



natural selection, author of several works on evolution. Lived 1809-18S2. 

 Darwin, Erasmus (dar' win). English naturalist and poet, grandfather of Charles 



Darwin. Lived 1731-1802. 



