South African Fossil Reptiles and Amphibia. 



181 



and the anterior ends approximate to one another The whole 

 of the lower border is formed by the septo maxillary which also 

 foims the upper border of the small external foramen, and passes 

 back some distance behind the nostril. 



The maxilla is long and narrow. The nasal is long and com- 

 paratively narrow, broader at its two extremities than in the 

 middle. Posteriorly the two bones are separated for a short 

 distance by the frontals. 



FIG. 46. L'fpsr view of type skull of Aloffcogmit-lrus tinnm . x J. 



FIG. 47. Ventral view of type skull of Alopecognathus minor as 

 developed, x ^. 



The prefrontal is fairly large ; the lachrymal smaller. There is 

 a pronounced antorbital depression. 



The orbit is longer than wide, almost wholly in the posterior 

 half of the skull. The postorbital arch is comparatively weak. 



There is a pronounced triangular-shaped postfrontal. The 

 postorbital does not pass far along the upper border of the 

 temporal fossa, most of the border being formed by the parietal. 



There is a large pineal foramen 10 ram. behind the postorbital 

 arch, wholly surrounded by the parietals There is no preparietal 



