GLOSSARY OF TECHNICAL TERMS. 353 
Carotid trunk. Ramification anteriorly of the bulbus aortz. 
Carpals. Wrist-bones. 
Carpus. The wrist. 
Caudal fin. Fin at or on the tail. 
Cavernous. Containing cavities, either empty or filled with mucous. 
Centralia. Middle row of carpal and tarsal bones. 
Centrum. Body of a vertebra. 
Ceratohyal. Median segment of the hyoid cornu. 
Cerebellum. The epencephalon. Anteriorly part of and derived from hind 
brain. 
Cervical. With reference to the neck. 
Cervical vertebre. Vertebra or vertebre of the neck. 
Chiasma. Crossing of the optic nerve fibers. 
Chin. Space at front of lower jaw. 
Choana. An opening into a funnel-like cavity, like one between nasal pas- 
sages and pharynx. 
Choroid. The second coat of the eye lining the sclerotic. 
Choroid plexus. Thickened vascular regions of the pia mater in contact with 
the thin epithelial roofs of the diencephalon. 
Ciliary muscle. Unstriped muscular fibres of the ciliary processes. 
Ciliary processes. Radiating folds at anterior or outer portion of the choroid, 
where joining the iris. 
Cirrt, Fringes. 
Clavicle. Collar-bone, or lower anterior part of shoulder-girdle, not entering 
arm-socket. 
Cleithrum. A bone on each side of interclavicle. 
Cloaca. Opening of ailimentary, urinary and genital canals. 
Cochlea. A posterior blind pouch of the sacculus. 
Columella. Cartilage bone attached to the stapes. 
Commisure. Line between two plates or scales. 
Compressed. Flattened laterally. 
Condyle,. Articulating surface of a bone. 
“Conus arteriosus. Main ramification of the heart below, or a fourth chamber 
of the heart in front of the ventricle. 
Coracoid. Cartilage or bone on ventral side forming part of arm-socket. 
Cornea. A transparent membrane on the outer or exposed portion of the 
eye replacing the sclerotic. 
Cornua. Slender rods of the hyhoid apparatus. 
Corpora striata. Floor of fore brain. 
Cortex. A thin superficial layer of gray matter in the hemispheres and cere- 
bellum. 
Costal folds. Plications or grooves showing position of coste, or ribs, in 
salamanders. 
Costal plates. Immovable ribs forming greater portion of the roof of the 
carapace in turtles. 
Costal shields. A series of about four plates or shields along side of carapace 
between the vertebral and marginals, in turtles. 
Costiform. Rib-like. 
Cranial. Relating to the skull. 
23 MU 
