Fauna and Stratigraphy of the Stormberg Series, 



347 



the lachrymal, so that it forms about 18 mm. of the orbital border; 

 but its width throughout most of its length is only about 6 mm. 



I can see no evidence of a postfrontal. Even if one be present 

 the frontal is still peculiar in that it passes back to form part of 

 the anterior border of the upper temporal fossa, separating the 

 postorbital from the parietal. The interorbital region has a median 

 elevation, broadened at the level of the postorbital bars, and nar- 

 rowing posteriorly until it forms the median parietal crest. On each 

 side there is a slight supraor bital crest; and between this and the 

 median ridge is a well-defined channel. The frontal forms half of 



Fig. 11. tiphenosuchus acutus, Htn. 

 Occipital view of skull, x 1. 



the supraorbital border. Its greatest length is in the middle line, 

 the sutures with the parietals passing well forward from a point 

 one-third along the parietal crest nearly to the anterior extremity 

 of the supratemporal fossa. 



The postorbital bar differs from that in Eupa.-'kei la and the allied 

 forms in that its upper end is in advance of the lower. The des- 

 cending portion of the postorbital is thus inclined backward instead 

 of forward, lying in front of the ascending process of the jugal. 

 The postorbital forms most of the outer border of the upper tem- 

 poral fossa and a small portion of the upper border of the lower 

 opening, anteriorly articulating with the frontal, and posteriorly over- 

 lying a part of the squamosal. Nowhere does it meet the parietal. 



