88 



]\rAEliS'E EEPTILES OF THE OXFOED CLAY. 



fused with the bones here described as frontals, then the element now under con- 

 sideration must be called the lachrymal. 



'Sid.ch. prcmaxilla {i)mx.,V\. III. figs. 2, 2 a; PL VI. fig. 1 ; text-figs. 46, 47) consists 

 of a broad anterior portion and a long facial process which extends back to behind the 

 anterior border of the orbits. They unite in a close median suture ; in the broad 

 anterior portion their upper surface is gently convex from side to side and is 

 roughened and perforated with numerous vascular foramina, some near the middle 

 line being of considerable size. The suture uniting these bones with the maxiilse 

 crosses the alveolar border immediately behind the socket of the fifth tooth. On the 

 facial surface the posterior border of the premaxilla runs upwards and backwards, 

 passing into the outer border of the facial processes, a little below which it is notched 



Test-fi?. 47. 



/ ^.^ 



vom. 



Semi-diagrammatic restoration of the palatal view of skull of Mura-nosaunis. (About ^ nat. size.) 



hoc, basioccipital ; i.n., internal nares ; Ljy.v., interptervgoid vacuity; _;., jugal ; mx., maxilla; pal., 

 palatine; pas., parasphenoid ; ]im.v., premaxilla; p.p.v., posterior palatine vacuity; pf., pterygoid; 

 q., quadrate ; sq., squamosal ; i.p., transpalatine ; vom., vomer. 



by the anterior ends of the external narial opening. On the palatal surface the 

 anterior ends of the vomers are wedged in between the palatal plates of the premaxillte, 

 and extend as far forwards as the level of the alveolus of the third or fourth tooth. 

 Each premaxilha carries sockets for five teeth : of these the first is small and close to 

 the middle line; the second, third, and fourth are much larger; while the fifth is again 

 small. The sockets of the first four teeth show that they were directed strongly 

 forwards and doubtless were specially fitted for the prehension of living prey. 



The vomers {vom., text-fig. 47) occupy a considerable area in the anterior part of the 

 palate. They consist of a comparatively narrow anterior portion, which is thrust 



