56 Annals of the South African Museum. 



of the border of the temporal opening. The pineal foramen is large, 

 18 mm. behind the postorbital bar, and entirely surrounded by the 

 parietals. 



The postorbital is rather weak, and forms the whole of the 

 anterior and more than half the upper border of the temporal fossa. 



The palate is typically Therocephalian in structure. The pre- 

 vomers are narrow bones passing some distance backward behind 

 the internal nares, and forming the inner border of those openings. 

 Their sutures with the pterygoid are indeterminable. 



The palatine is a plate-like bone forming a small part of the 

 posterior border of the internal nares, and having a long 

 articulation with the maxilla. 



The pterygoid is large. The transpalatine is large, and articulates 

 with the pterygoid, maxilla, and palatine. Between it and the 

 pterygoid there is a very well-defined foramen. 



The symphysis of the lower jaw is weak. The dentary is a strong 

 bone, forming about two-thirds of the jaw. It possesses a pro- 

 nounced mentuni. The splenial extends back as far as the plane 

 of the front of the orbit, lying along the inside of the dentary. It 

 is a thin bone. The coronoid is small. The angular lies posterior to 

 the dentary, wedged in between that bone and the splenial. Between 

 it and the dentary is a small foramen. The surangular is large, but 

 is more than half-hidden from view by the angular. 



The chief measurements of the skull are : 



Greatest length 230 rnm. 



Distance from snout to front of orbit 115 ,, 



Diameter of orbit 42 ,, 



Interorbital width 46 ,, 



Intertemporal width 28 ,, 



In the possession of two large canines and five incisors this form 

 resembles Lycosuchus and Trochosuchus. It lies nearest to the 

 former genus, being distinguished from it by the shallow incisor 

 region of the upper jaw, by the much deeper dentary characters 

 in which it agrees with Trochosuchus and by the greater width 

 of the intertemporal region. From Trochosuchus it is distinguished 

 by the fact that the two canines are approximately equal in size, 

 whereas in the older genus the first canine is of the size of the 

 incisors, and the second canine is considerably larger. This form, 

 therefore, seems to stand in an intermediate position between 

 Lycosuchus and Trochosuchus. 



The type is in the South African Museum (Cat. No. 2756). 



