On some Grorgonopsian Skulls. 503 



foramen. The nasals end anteriorly in a nearly straight margin, 

 and externally overhang the nostril slightly. The nostrils look mainly 

 forward. 



Careful development of the palate, shows that Broom's figure is 

 substantially correct. The pterygoid has no anterior prolongation 

 and is widely separated from the posterior nares and prevomer by 

 the palatine. The deep median groove in front of the pterygoids is 

 partly covered in by processes of the palatines as in the Aeluros- 

 aurid figured by Watson in his 1921 paper; and there seems to be 

 a median suture throughout this groove, the ''vomer" thus being 

 prevented from forming a part of the palatal surface. 



AELUROGNATHUS TIGKICEPS, Br. and Htn. 



J9l:>. Scyvn.noqnafhvs figric(j>x Broom and Haughton. Ann. S. Afric. 

 Mus. XII. 1. p. 26, IM. VI, figs. 14. 



-191)). Scymnognathus figricejis Broom. I'roc. Xool. Soc. p. '225. 



1914. Scymnognathus tigriceps Broom Phil. Trans. 1!. Vol. 206. 

 p. 46. IH. VI, lig. 6<i. 



The type skull is considerably crushed laterally, as is evidenced 

 by the bending backward of the right ptervgoid llange : so that 

 probably the height of the snout is exaggerated when compared with 

 its width. Comparison of the photographs of the type in the Annals 

 S. A. Museum with Broom's figure of 19113 shows that the vertically 

 of the snout in the latter is somewhat exaggerated. The snout is, 

 however, not so rounded as that of Scymnognathus whaitsi. There is 

 no "step" between the lower edges of the premaxilla and maxilla, The 

 septomaxillary foramen is fairly large. The septomaxilla is large and 

 has a large facial portion. The nostril is well overhung by the nasals, 

 which have a straight front edge transverse to the axis of the snout. 



The palate is so crushed that it is rather indefinite. The palatines 

 are very large and the pterygoids comparatively small, the latter 

 having no anterior extension to the internal nares. The presence or 

 absence of a median bone on the palate is uncertain. The median 

 portion of the palate is deeply grooved between two prominent 

 ridges formed bv the pterygoids and palatines. Between the pterygoid 

 flanges and the posterior nares the palate is shorter than in S'r//w- 

 nognnthns wlicritsi approximating more in this particular to that of 

 the Aelurosaurids. The ectopterygoid is large, and forms part of 

 the front face of the powerful pterygoid llange. The anterior part 

 of the mouth is considerably vaulted. 



There is a weak preorbital depression on the face. 



