Fauna and Stratigraphy of the Stormberg Series. 



345 



temporal fossa is elongate, oval in shape, and larger than that of 

 Euparkeria or Ornithosuchus. The shape of the infratemporal fossa 

 is characteristic in that its anterior border, formed by the jugal and 

 postorbital, passes upwards and forwards instead of upwards and 

 backwards as in Euparkeria and Ornithosuchus; so that the superior 

 length of the opening is about equal to the inferior length. 



The snout is characterised by the fact that the premaxilla does 

 not form an anterior border to the nostrils, these being quite ter- 

 minal. Further, there is no trace of a median septum dividing 

 them. The roof of the snout is formed by the paired nasals, which 

 are broken posteriorly. The extreme tip of the left nasal is missing 

 but the bones w-ere obviously pointed in front. The whole of the 



Fig. 0. Side view of skull of Sphenosuchus acutus Htn. X f. 



(Slightly restored.) 



posterior and lower borders of the nostril are formed by the pre- 

 maxilla, which sends back a process separating the forward portion 

 of the maxilla from the nasal. The nostril seems to have had an 

 upper prolongation between the nasal and premaxilla. The pre- 

 maxilla carries apparently three or four simple pointed teeth. 



There is no septomaxilla present on the face. 



The antorbital vacuity is large, and is sunken in the face, having 

 borders which make an oblique angle with the sides of the face. 

 The whole of the anterior and lower borders is formed by the 

 maxilla, which extends back only as far as the front of the orbit 

 not nearly so far as in Euparkeria. The maxilla carried about 

 12 teeth, of which 8 are preserved on the right side. Unfortunately, 

 not one possesses the crown; but a small tooth in the lower jaw 

 shows serrations on the anterior border similar to those of the car- 

 nivorous Dinosaurs. The teeth are llattened laterally, and vary 

 considerably in size. The first maxillary tooth has an antero-posterior 



