464 



DR. W. G. RIBEWOOD ON THE CRANIAL [DeC. 13, 



the skull to determine their presence. The opisthotic is moderately- 

 small, and more ventral than posterior in position; it touches 

 the pro-otic, squamosal, and exoccipital, but is remote from the 



Text-fig. 126. 

 me 



ps 



pbf 



pro 



Craninia of GJiatoessus erehi. — A, dorsal view; B, left sidej C, back view. 

 For explanation of lettering see p. 493. 



epiotic. An auditoiy fenestra is present, bounded by the pro-otic, 

 exoccipital, and basioccipital. At the back of the cranium are 



