South African Fossil Reptiles and Amphibia. 53 



teeth, which are small and of the usual type. On the maxilla two 

 teeth can be discerned. 



The nostrils are large, and placed well forward. The nasals are 

 long bones, and along their junction below the well-marked frontal 

 boss is a fairly deep median groove 56 mm. long. 



It is difficult to be absolutely certain of the sutures of the top of 

 the skull on account of the peculiar weathering of the surface, but 

 their probable positions can be assigned. 



The prefrontal and lachrymal are both large bones, coming well 

 forward from the orbital border on to the cheek. The prefrontal 

 forms most of the anterior border of the orbit. 



The frontals form the upper border of the orbit, giving rise to the 

 very pronounced supraorbital crest. Near their anterior margin, 

 and just above the groove in the nasals, is a large median boss, the 

 presence or absence of which may probably be taken as a specific 

 character in this genus. The postfrontals, if present, are indis- 

 tinguishable. 



The pineal foramen is large and situated just behind the 

 postorbital bar. It is entirely surrounded by the parietals. 



The eye is large, looking forwards and outwards. The temporal 

 fossa is larger than the eye, higher than long, and looks outwards, 

 upwards, and slightly backwards. It is almost wholly bounded by 

 the postorbital and the squamosal, only a portion of its superior 

 border being formed by the parietal. 



The postorbital bar is very massive, being strongest at the junction 

 with the jugal. The squamosal has a broad descending portion 

 which passes forward, articulating with the jugal and pushing the 

 quadrate forward to the level of the middle of the orbit. 



The quadrate has a large articular surface for the lower jaw. 

 Posteriorly it forms a flat, plate-like bone which articulates with 

 the squamosal and the paroccipital. The quadrato-jugal is well 

 denned, but small. Its upper border is clasped by the jugal, its 

 lower border rests on the squamosal, while internally it articulates 

 with the quadrate. Apparently it forms no part of the articular 

 surface for the lower jaw. 



The interparietal is 70 mm. high, and narrows rapidly below. It 

 articulates laterally with the tabulare, and inferiorly with the bone 

 which may be the supraoccipital, although on account of the 

 imperfection of the specimen no suture can be seen between that 

 bone and the basioccipital. The element in the lateral part of the 

 occiput, which was mentioned in the description of Scymnognathus 

 tigriceps as occurring in Dinocephalians, is here well seen, and 



