40 



MR. D. M. S, WATSON ON THE 



Otherwise the skull is complete and, on the whole, extremely well 

 preserved. It is represented by beautiful and most accurate 

 lithographic drawings in Owen's Catalogue. From Mildenhals, 

 Fort Beaufort. Another more complete, but less well-preserved, 

 skull from the Endothiodon-zone of Beaufort West is in the 

 American Museum of Natural History. 



Text-figure 4. 



Gorgonops tonus Owen. Type-skull. 



Dorsal aspect. X|. Parts in broken line restored without evidence. 



Fe., frontal ; I.Pae., interparietal; Pb.Fe., prefrontal ; P.O., postorbital ; 



Pt.Fe., postfrontal; S.Mx., septomaxilla ; S.Oc, supraoccipital. 



The skull of Gorgonops has a flat dorsal surface, which passes 

 through a chamfered corner into the nearly vertical sides of the 

 snout. The orbit is large, directed almost entirely laterally and 

 of considerable depth. Immediately in front of it the snout is 



