Fauna and Stratigraphy of the Stormberg Series. 351 



The condition of the basicranium is somewhat similar to that seen 

 in Thecodontosaurus aniiquus, but differs in that the basisphenoidal 

 tubera are placed further back and more ventrally in this new form, 

 so that the lower surface of the basioccipital instead of passing 

 almost entirely forward has a very concave profile when viewed from 

 the side. The basisphenoid, too, differs in that it is longer in com- 

 parison with its width, neither the outward ridges of the bone which 

 lead to the tubera nor the forwardly directed pterygoid apophyses 

 diverging at so great an angle from each other as in the higher form. 



The postpalatal vacuity lies directly below the orbits, and has a 

 length of 26 mm., and a width of 9 mm. Almost the whole of its 

 inner border, its anterior border, and part of its outer border are 

 formed by the palatine. Its hinder border, and the remainder of 

 the outer border is formed by the transpalatine. 



The internal nares are not seen, but must have been considerably 

 in advance of the postpalatal vacuity. 



The anterior prolongation of the pterygoid passes far forward as 

 a narrow bone with a rounded keel, separated from its neighbour 

 by a well-marked groove. At the level of the front of the postpalatal 

 vacuity it begins to broaden out and passes back as a gradually 

 broadening plate articulating with, and lying below, the palatine. 

 Posteriorly the mesial rounded keel becomes less pronounced and 

 the platelike portion of the bone has a slight median depression. 



The palatine is not wholly displayed. It articulates with the 

 pterygoid internally, with the maxilla externally, and with the trans- 

 palatine posteriorly, forming the anterior and inner borders of the 

 postpalatal vacuity. The front part of the bone carries a pronounced 

 ridge which runs zig-zag across the bone with deep hollows in front 

 and behind. There is no evidence that this ridge carried teeth. 



The transpalatine is a stout bar with a strong expanded articu- 

 lation with the maxilla externally. It separates the postpalatal 

 vacuity from the large pterygoid vacuity ; internally it is broken off, 

 but the impression of the upper surface of the bone on the matrix 

 remains in part, and it seems to have met both the palatine and 

 the pterygoid. 



Of the whole palate the premaxilla, maxilla, and prevomer form 

 but a small part : in this, as pointed out in an earlier paper, the 

 form agrees with Erpetosuchm and differs from Ornithosuchus. 



The lower jaw is incomplete. About 100 mm. of the right ramus 

 is anchylosed to the anterior 40 mm. of the left ramus, while a 

 small portion of the back of the jaw is attached to the left quadrate. 

 I am thus unfortunately unable to say whether or not a fossa was 



