320 



K. J. Anderson, 



The interparietal fissure in Pelosaurus (Dyas) is nearlj^ equal to 

 the interfrontal suture although the parietals appear to be larger than 

 the frontals, there are pre- and postfrontals of course. The parietal 



Fig. 1. 



Pelosaurus. 



Fig. 2. 

 Procolophon trigoniceps. 



suture is larger in Branchisaurus (Dyas). The interparietal suture in 

 Archegosaurus decheni (Dyas Prussia) is half the length of the frontals 

 in the middle line, but there are post Squamosals. 



m 



PMX. 



Fig. 3. 

 Ichthyosaurus. 



Fig. 4. 

 Palaeohatteria. 



Fig. 5. 

 Plesiosaurus. 



Anomodonta. In Procolophon trigonoceps the interparietal suture 

 appears to be one third smaller than the interfrontal. Gordonia 

 Traquairi shows a long parietal as well as an interparietal bone. 



