238 



THE OSTEOLOGY OF THE REPTILES 



more or less flattened and denticulated along their border/ not more 

 than eighteen in either jaw, subisodont or with a large caniniform 

 tooth; no teeth on palate. Pre vomers, palatines, and pterygoids 

 united in midline, concealing the parasphenoid. Quadrate large. 

 Vertebrae deeply concave or notochordal. Atlanto-axis as in Dime- 

 trodon (Theromorpha) ; four sacral vertebrae. Ribs dichocephalous, 

 probably no parasternals. Shoulder girdle massive; procoracoid 

 barely entering glenoid fossa; a feeble cleithrum sometimes, if not 



Fig. 170. Skeleton of MoJfAo/)j (Dinocephalia). After Gregory. One twenty-second natural 

 size. Skeleton in American Museum. 



always, present. Large clavicles and interclavicle. No acromion. 

 Pelvis with small pubo-ischiatic vacuity. An entepicondylar fora- 

 men. Legs stout; epipodials and digits short; phalangeal formula 

 unknown, probably primitive. 



Family Tapinocephalidae. Middle and Upper Permian. Del- 

 phinognathus Seeley, Lamiasaurus'^ Watson, Moschognathus Broom, 

 Mormosaurus Watson, Moschops Broom, Moschosaurus Haughton, 

 Phocosaurus Seeley, PnigaUon Watson, Struthiocephalus Haughton, 



1 [This statement refers only to the cheek teeth; the premaxillary teeth and the first 

 three or four in the dentary have a long conical crown, greatly expanded posteriorly 

 at the base, and long roots. — Ed.] 



- [Cranium, Fig. 170. — Ed.] 



