On a Nearly Perfect Skull of a New Species of the Gorgonopsia. 9 



serration, though the evidence is not quite conclusive. The 5 

 incisors measure 23 mm. 



The septomaxilla is also as in Therocephalians. The posterior 

 process is long and separates the anterior part of the nasal from the 

 maxilla. 



The maxilla is large and deep. In front it overlaps the premaxilla. 

 There is a single fair- sized canine situated 8 mm. behind the last 

 incisor, and measuring in section 8*5 mm. by 6 mm. There are a 

 few small rounded molars, but the exact number cannot be made out 

 with certainty. Three are preserved. Possibly the original number 

 was 5. These molars are only about ^ of the size of the incisors. 



The nasal is large and fairly wide. It is only slightly wider at 

 the front and behind than it is in the middle. The internasal 

 pi'ocess is evidently feeble. 



The prefrontal is large and forms the upper and anterior quarter of 

 the orbital margin. It unites behind with the postfrontal, shutting 

 out the frontal from the orbit. In this it agrees with the conditions 

 in the higher Cynodonts and differs from all known Therocephalians, 

 and also from the lower Cynodonts and from the Anomodonts. 



The lachrymal is of moderate size, and the canal seems to be 

 inside the orbit. 



The jugal is fairly large but much hidden by the overlapping 

 squamosal and postorbital. 



The frontal is large, the two forming most of the interorbital 

 region. On its outer side it articulates with the prefrontal and post- 

 frontal. Behind it meets the parietal and preparietal. 



In the middle line between the two frontals and the two parietals 

 is a small median bone, manifestly the bone which in the Anomo- 

 donts has been called the preparietal. This character is perhaps the 

 most interesting in the skull. For long the little median bone which 

 lies mainly in front of the parietal foramen has been known in the 

 Anomodonts. It has been variously named parietal, interparietal 

 and preparietal. Quite certainly it is neither the parietal nor the 

 interparietal, and the name preparietal proposed by Seeley and 

 adopted by myself and others seems the best name for it. It is 

 known in all Anomodonts except Cistccephaius, but hitherto it has 

 not been recognised in any other group. The discovery of a pre- 

 parietal in another group is thus of great interest. It pretty 

 certainly does not occur in most Therocephalians. That it should 

 occur in the Gorgonopsidae, the group which in some other respects 

 most approaches the Anomodonts adds further confirmation to the 

 view I expressed many years ago that the Anomodonts are descended 



