Investigations in South African Fossil Rcptilia and Amphibia. G7 



in being more pointed, the skull of Ehinesuchus differs from that of 

 the American genus Eryops in lacking the interfrontal bone. I have 

 searched carefully for evidence of this bone in all the species, but 

 can find none. Moreover, although the lower jaws I have examined 

 are not in the best condition for showing sutures, I am not able to 

 find any tripartite division in the coronoid bone. 



EHINESUCHUS WHAITSI, Broom. 



(Plate XII., figs. 3, 4. Text-fig. 7.) 



1908. Broom, Ann. S. African Mus., iv., 8, p. 373; pi. xlvi., fig. 3. 



An almost complete skull and lower jaw (S.A.M. Cat. No. 3009) 

 collected by the Eev. J. H. "Whaits at Beaufort West (Endothiodon 

 zone of Beaufort Beds) enables me to give more details concerning 

 this species. 



In its general outline the skull has a shape like that of Eryops 

 megaccphalus and Rhinesuchus semkalensis. The upper surface of 

 the skull and the outer surface of the lower jaw are covered with 

 a pitted sculpturing. In the snout and mid-regions of the skull the 

 pits are roughly circular; in the jugal, quadratojugal, and squamosal 

 regions the pits are more elongated. The orbits are wholly in the 

 posterior half of the skull and are comparatively more nearly set 

 together than in Eryops. The articular region extends well behind 

 the occiput. The following are some of the principal measurements 

 of the skull : 



Maximum length 312 mm. 



Length on median line 265 ,, 



Maximum width 258 ,, 



Interorbital width 40 ,, 



Internasal width 41 ,, 



Length from back of nostril to front of orbit 125 ,, 



Length from plane of snout to front of orbit 158 ,, 



Length of orbit 33 ,, 



Width of orbit 34 



Comparison with the type specimen of R. whaitsi shows that the 

 skull is flattened, but the width and general size of the parasphenoid 

 and the pterygoids, as far as they can be compared, leave no doubt that 

 this skull belongs to the species already described. Unfortunately 

 the sutures on the top of the skull are not visible, but the structure 

 of the palate can be made out fairly well. 



The parasphenoid has a flat posterior portion similar to that 



