CLASSIFICATION OF THE THERIODONTIA. 



83 



coatinuiug the plane of the paroccipital processes, with whose ends 

 they are rigidly articulated. The posterior surface of the lower 

 part of the squamosal is separated from that of the paroccipital 

 by the usual ridge, which borders a groove for the external 

 auditory meatus. 



This ridge continues upwards until, just below the level of the 

 post-temporal fossa,, its hinder margin is turned inwards ab 

 a scroll with a thickened edge in a very unusual manner, not 

 understood by me when I published my figure of the palate. 



Text-figure 24. 



Sci/mnosaurus ivatsoni Broom. Type-skull. 



Brain-case in sagittal section seen from the left side. Epipterygoid of left 



side seen in outer view. X §. 



I.Au.M., internal auditory meatus. 



This scroll overhangs the occiput, but very rapidly subsides 

 into the general surface of the squamosal, just at the point where 

 that bone begins to bend backward. 



The lower edge of the squamosal is thin and is split by two 

 notches associated with the attachment of the quadrate. 



The quadrate, or in all probability the fused quadrate and quad- 

 rato-jugal, is relatively small, nothing of its hinder surface being 



