1866.] HUXLEY TELERPETON ELGESTENSE. 79 



The counterpart of the fragment which contains the greater part 

 of the skull exhibits the impressions of part of the roof of the skull 

 with the left orbit and left supratemporal fossa. It proves that the 

 squamosal bone was large, thick, and slightly elongated posteriorly 

 and externally, while its outer edge seems to have been undulated. 



There is no evidence that any postfrontal bone separated the 

 temporal and the orbital fossae, the two forming one oval space 

 about 0-7 in. long and 0*4 in. wide. The roof of the skull can be 

 traced forwards, narrowing gradually for a distance of 0-65 in., and 

 then seems to have suddenly contracted to form the interorbital 

 region. Here, however, it is completely hidden by the matrix. 



In the prefrontal region it widens out again ; and a curious, per- 

 fectly separate, sandstone cast of the interior of this part of the 

 skull has been formed. This cast is shaped somewhat like an ace 

 of spades, with a truncated apex and a trilobed base, and presents a 

 few traces of bony matter upon its upper surface. The rest of its 

 exterior is stained, for the most part, of a reddish colour, as if by 

 oxide of iron. 



The middle basal lobe presents a truncated, uneoloured surface, 

 where it has broken off from the matrix which lies behind it. 

 The anterior end is similarly fractured and unstained ; and there 

 are two oval, uneoloured elevated spaces on the under surface of 

 the cast, which answer to the posterior nares. All the rest of the 

 cast has been enveloped in bone, which must have been furnished, 

 at the sides, by the prefrontals and below by the vomers or the pala- 

 tine bones. The impression of the upper surface of the vomers 

 has left a strong median groove along the under surface of the cast. 

 The surface of the matrix upon which this cast fits shows the 

 remains of the oral faces of the facial bones, the bony matter itself 

 appearing to be, for the most part, replaced by oxide of iron. 



Each of the teeth, already mentioned, which are implanted in 

 the praemaxillae, is rather less than 0*1 in. wide, and rather more 

 than 0-1 in. long. Their apices appear to have been rounded 

 (fig. B). 



The maxillae are strong, and send up a process behind the exter- 

 nal nostril. The roots of several teeth, placed in a single series 

 from before backwards, occupy the alveolar surface of the thick 

 anterior moiety of each. The palatine bones meet, and appear to 

 be completely united in the middle line, nor does any posterior 

 palatine space appear to be left between them and the transverse 

 and maxillary bones. The very imperfectly preserved bony matter 

 which remains is dotted over with rows of red spots of oxide of 

 iron, the arrangement of which forcibly reminds me of that of the 

 palatine teeth in Hyperodajpedon, though I cannot make sure that 

 these spots reaUy represent teeth. Posteriorly the palatine bones 

 meet the pterygoids, which diverge and pass backwards, to become 

 connected with the quadrate bones in the ordinary way. 



In the interspace between these the remains of the basi-sphenoid 

 are visible. 



The quadrate bone, 0-7 in. long, is strong ; and its anterior aspect 



h2 



