IN THE CAKNIVOnOlIS DINOCErHALIAN REPTILES. 



665 



the lower border of the orbit. Posteriorly it forms with the 

 sqiinmosal the sliort, deep, lower temporal arch. The posterior 

 process of the jngul reaches to the descending part of the 

 squamosal. Its lower border is curiously and very coarsely 

 roughened. 



The squamosal is a very large bone with an ascending, a 

 descending, and an anterior pi'ocess. The ascending process forms 

 the back of tlie temporal fossa, and articulates with the parietal 

 and the tabular. The descending process passes downwards and 

 slightly forwards. It has a. moderately developed outer side and 

 a larger occipital face. The occipital face almost completely 

 covei"S the huge quadrate. 



There is a small quadrato-jugal which must be very largely, if 

 not completely hidden from external view by the squamosal. 



The quadrate is very badly weathered, but must have been a 



Text-ficure 3. 



Oblique section from the nasal region to the largest part of the pterygoids, 

 in Scapanodon duplessisi Broom. About \ nat. size. 



large bone. The upper portion lies far up inside the folded 

 squamosal. 



The occiput is not very well preserved, but appears to be 

 essentially similar in structure to the fairly well preserved 

 occiput of the genus to be next described. 



The parietals are very thick and the pineal foramen large. 



The postfrontals and postorbitals are very badly preserved. 



Much of the lower jaw can be seen on one or other side. The 

 general structure appears to be fairly similar to that of the jaw 

 in the Tapinocephaloids. The dentary has a distinct though 

 probably short coronoid process. The angular is large, and forms 

 the greater part of the outer side of the back part of the jaw. 

 The surangular is a powerful bone with a very thick upper edge^ 

 which, when the jaw is closed, lies outside the descending process 

 of the squamosal as shown in text-fig. 1. 



