PROMERYCOCHCERUS 143 



The glenoid articular surface is strongly convex, its transverse diameter being, as usual, the greater. 

 The stout postglenoid process is 22 mm. in transverse, and 18 mm. in anteroposterior diameter. 

 The bullae are large and ovoidal. They extend forward to the midline of the glenoid surface and 

 downward somewhat below the inferior edge of the postglenoid process. The paroccipital processes 



Fie. 103. — Promerycochcerus temporalis (Bettany) = P. suferbus. Skull. HT. Cat. No. 329S W.M. 1/2 nat. size. 

 (Drawn from Woodwardian Museum photographs and from Bettany, 1876.) 



Fig. 104. — Promerycochcerus temporalis (Bettany) = P. suferbus. Right half, superior view of skull. HT. Cat. No. 

 3298 W.M. 1/2 nat. size. (Drawn from Woodwardian Museum photographs and from Bettany, 1876.) 



are broad and platelike at the base and are in contact with the bulls. Farther down, the long axis 

 is anteroposterior. The stout occipital pillar is flanked by deep lateral fosss. Index: 0.507. 



Mandible: The chin profile is straight, and the symphysiodental angle is 45°. The promi- 

 nent mental tubercle lies below P 2 to Ps. The horizontal ramus deepens gradually aft beneath 

 the tooth row, and the angle is moderately prominent. The masseteric fossa is deep and does not 

 extend below the alveolar border. The coronoid process is low, the sigmoid notch wide and shallow, 

 and the condyle very slightly convex and inset. 



