GLOSSARY OF TECHNICAL TERMS. 361 
the mouth and becomes attached to the ventral surface of the brain. 
The dilated end of this diverticulum and the end of the infundibulum 
form the gland-like pituitary body. 
Planta. Sole of foot. 
Plantigrade. Walking on the soles of the feet. 
Plastron. Lower shell of a turtle. 
Pleurodont. ‘Teeth fixed by their bases to lateral surface of ridge of jaw. 
Plicate. Folded so as to show transverse folds or wrinkles. 
Plumbeous. Lead-colored or dull bluish-gray. 
Pollex. ‘Thumb. 
Post-caval vein. A large dorsal vein connecting the hepatic veins with the 
renal veins. 
Postfrontal plates. Parietal plates, on serpents. 
Postmental plate. Second scaly plate at end of mandible in lizards. 
Postocular plate. One or two scaly shields behind eye, in serpents. 
Postorbital: Behind eye. Postocular. 
Postorbital plates. Postoculars. One or more scaly plates behind the eye, 
before the temporals, in snakes. 
Post-temporal plates. One or more scaly shields, comprising third row, be- 
hind eye. 
Preanal plates. A single or divided scaly plate, before the vent in lizards 
and snakes, 
Precaval veins. Ramifications of the sinous venosus which ramify into the 
jugular and brachial veins. 
Precoracoid. Portion of coracoid more or less separated from rest. 
Prefrontal plates. A pair of plates just before the frontal, in lizards and 
snakes. 
Preloreal plate. First of scaly loreal plates, in lizards. 
Premaxillary. Front bone of the upper jaw. 
Preocular. Before eye. 
Preocular plates. Preorbital plates. 
Preorbital plates, Preoculars. One or more scaly plates before the eye, in 
serpents. 
Presphenoid. A median continuation forwards of the basisphenoid. 
Procelian. Concave in front only. 
Projectile. Capable of being thrust forward. 
Pronephros. ‘The fore kidney, usually deciduous. 
Prootic. Bone forming front side of brain-case. 
Prosencephalon. Anterior portion of the fore brain. 
Prosocele. Fore ventricle of the brain. 
Protractile. Capable of being drawn forward. 
Proximal. Nearest. 
Pierotic. Bone at side process back on skull. 
Pterygoids. Bones on roof of mouth behind palatines. 
Pubic bones. Lower pelvic bones. 
Pulmo cutaneous trunk. Outer or posterior ramification of the bulbous aorte. 
Pulmonary. Relating to lungs. 
Pulmonary artery. A division of the pulmo-cutaneous trunk to the lung. 
