88 



MARINE EEPTILES OF THE OXFOED CLAT. 



portion is, speaking generally, convex from side to side, and is, to a great extent, 

 overlapped and concealed by the adherent outer wing of the exoccipital, which extends 

 along it to within a short distance of the articular surface. From this point the 

 suture with the overlapping exoccipital runs close to the hinder edge of the quadrate 

 as far as the outer angle of the posterior wing of the pterygoid, with the outer edge of 

 which the quadrate unites, sending on to the side of the brain-case a prolongation, 

 the precise relationships of the inner end of which cannot be observed. 



Test-fig. 33. 



eu.m. 



Palatal view of the posterior part of the skull of Steneosaurus durobrivensis. (about 3 nat. size.) 

 hoc, basioccipital ; bs., basisphenoid ; car., carotid foramen ; eu.L, lateral eustachian opening ; eu.m., 

 median eustachian opening ; ex.o., exoccipital ; i.nar., internal nares ; j., jugal ; l.t.f., lateral temporal 

 fossa ; mx\, maxilla ; pal., palatine ; p.fr., postfrontal ; pt., pterygoid ; q., quadrate ; q.art., articular 

 surface of quadrate ; q.j., quadrato-jugal ; s.o.v., suborbital vacuity ; tp., transverse bone. 



The quadrato-jugal (q.j.) unites by a posterior expansion with the outer edge of the 

 quadrate, then narrows into a rod of bone which, after running forwards a short distance, 

 joins the jugal in an overlapping suture. The jugal (j.) is also rod-like posteriorly ; 

 anteriorly it widens out and becomes compressed from side to side. In front of the 



