28 GLOSSARY. 



Coccyge'al. Relating to the coccyx ; composing the coccyx. 

 Coccygomor'phae (Gr. kokkux. a cuckoo ; morphe, form). A 



division of the Carinate birds which includes the Cuckoos, 



Kingfishers, and Trogons. 

 Coc'cyx (Gr. kokkux, a cuckoo). The term applied to the four 



posterior vertebras of man, which unite to form a structure 



similar to the beak of a bird. 

 Cochlea (L. a snail's shell). A structure forming part of the 



internal ear. 

 Cocoon' (Fr. cocon ; Gr. kokkos, a kernel). The covering of an 



insect in the pupa state. 

 Coelentera'ta (Gr. koilos, hollow; enteron, an intestine). A 



group of the Metazoa which includes the Hydrozoa and 



the Actinozoa. 

 Co3'liac artery (Gr. koilia, a hollow, the belly). A short wide 



branch of the aorta given off just below the diaphragm. 

 Coeliac canal (Gr. koilia, the belly). The largest of three canals 



which run in the arm in the Crinoidea. 

 Cosnen'chyma (Gr. koine, in common; chuma, something 



poured). The intermediate skeletal layer developed in 



some Actinozoa in the process of gemmation or fission, by 



the new polype, and which is continuous with that of the 



other polypes. 

 Coe'nosarc (Gr. koine, in common ; sarx, flesh). The common 



stem which sometimes unites the buds of a hydrozoon. 

 Co'itus (L. a coming together). The congress of the sexes. 

 Coleo'ptera (Gr. Koleos, a sheath ; pteron, a wing). The beetles, 



so called because the anterior chitinous wings form cases 



for the posterior membranous pair. 

 Coleorhi'za (Gr. koleos, a sheath ; rhiza, a root). A wreath 



which encloses the radicle of an endogenous embryo. 

 Colla'teral sul'cus. The groove in the cerebral hemispheres 



which gives rise to the collateral eminence in the lateral 



ventricles. 

 Collete'rial glands (Gr. kolletos, glued). Two glands in the 



cockroach which probably give rise to the cases of the eggs. 

 Colli'culus (L. a little hill). A small elevation. 

 Colli'culus bul'bffl ure'thrge (L. little eminence of the bulb of the 



urethra). A layer of spongy tissue surrounding the bulb 



of the urethra. 

 CoUi'culus ner'vi op'tici (L. little eminence of the optic nerve). 



A small eminence on the retina where the optic nerve 



expands. 



