86 



Mr. D. M. S. Watson on Pleurosaurus and 



These three rami meet and form a cap over the top of the 

 quadrate. The bone in this region has a powerful articula- 

 tion with the end, and particularly the front face of the 

 paroccipital — in fact, it sends a special thick process down 

 the front face of that bone, which (in some specimens at 

 any rate) actually reaches and touches the distal end of the 



Fig. 1. 



Ju. QuJ, 



A. Temporal region of the skull of Sphenodon, X 2. 



B. Temporal region of the skull of Uromaslix, x 2. 



Jr., ]ugal ; P.O., postorbital: Pt.Fr., postfrontal ; Qu., quadrate ; 

 Qu.J., quadrato-jugal ; Sq., squamosal. 



pro-otic. This process separates the head of the quadrate 

 from the distal end of the paroccipital. Another special 

 little process runs back along the posterior surface of the 

 pterygoid wing of the quadrate at the top, and its forward 

 end has a distinct suture with the pterygoid. 



Comparison of this description with that of the squamosal 



