1074 DR. It. liROOM ON Xi;\\ TKUMIAX 



(listinot is beyond question, :uid the marked diti'erence in the 

 tempoi'iil region seems to me of sufficient importance to justify the 

 formation of a new genus for its reception. 



The Uiisal region makes with the line of the teeth a sharp angle 

 of about 45°, and the snout is moderately broad. The pre- 

 maxillaries are small and each carried three teeth. 



The maxillary is moderately large and fiat and carried 12 teeth, 

 of which the first four are large and may be regarded as canines. 

 The sejjto-maxillary is a small bone which forms the lower wall of 

 the nostiil, and passes backwards a short distance, separating the 

 nasal from the maxilla. 



The nasals are fairly large i-ounded hones which ai-e separated 

 from each other at the lower part by the internasal processes of 

 the premaxillaries. 



Tlie orbit is large and round, protected above by a marked 

 thickening of the supraorbital border and behind by a strong 

 postorbital arch. The bones surrounding the orbit appear to be 

 very similar to those of Delphinognathite and Tapinocephalus, 

 though the limits of the prefrontal have not been clearly made 

 out. The lachrymal foramen is large and opens on the face. 

 The jugal forms the lower border of the orbit. It is a ila,t and 

 relatively slender bone which passes back to meet the squamosal 

 and the quadra to- jugal. 



The quad rato- jugal is a small bone which rests on the descending 

 process of the squamosal and on the quadrate. It does not as in 

 Belphinognathns unite with the jugal to enclose a foramen. 



The quadrate is very similar to that of the Pelji^cosaurs. In 

 the type it is considerably crushed and displaced. 



The squamosal is large. It has a long slender ascending process 

 which forms part of the posterior wall of the temporal fossa and 

 meets the parietal. A descending process supports tlie quadrate, 

 and- an anterioi' meets the jugal. The upper part of the squamosal 

 rests on a flat bone which forms part of the occiput, and which 

 I regard as the opisthotic from a comparison with the bone in 

 Marsupials and Cynodonts. 



The f rentals are large and broad and enormously thickened. 

 The parietals are relatively small, but like thefrontals extremely 

 thick. They enclose, as in Delphinognathiis and Tapinocephcdas, 

 a large pineal foramen. The edges of the foiumen are elevated, 

 but the pineal region stands out less prominently than in 

 Uelphinognathtts. 



The occiput is moderately flat, and the condyle large and 

 rounded. The upper side of the condyle has a deep hollow 

 groove for the medulla, and in the middle line immediately below 

 the medullary groove is a small deep pit which passes forward 

 into the basioccipital for the notochord. 



The palate is imperfectly known, but appears to be fairly 

 similar to that of I'apinocephalus. 



The lower jaw is like that of DelpMnognatlius but more fully 



