No. 5.] 



PARIOTJCHUS I AX I SI V US COPE. 



239 



to show that it was small and flat, and even in the natural con- 

 dition was covered by the surrounding bones to a large extent. 

 The arrangement of the bones of the lower surface is partly 

 indicated in Fig. i. 



The lower jaw is of the same type as the modern Sphenodoii; 

 there is a rather low coronoid process, and the angle of the jaw 

 extends posterior to the articulation. 



The Vertebrae. — There are eighteen presacral vertebrae in 

 the specimen ; a break between the skull and the anterior end 



FiG. 2. — Superior view of skull. The sculpture of the surface is indicated in the 

 different regions, s.o., supraoccipital. 



of the body suggests the possibility of one or more having been 

 lost, but this is hardly probable ; the author collected the speci- 

 men here described, and from the position of the bones and the 

 condition of the matrix it seems that the column must be per- 

 fect. The number of presacrals is very interesting, as it is the 

 characteristic number for Pareiasaiirus and the turtles. The 

 anterior two vertebrae have been badly crushed and lie upon 

 the lower surface of the skull ; enough can be seen to show 

 that the atlas was a simple ring; the face for the occipital 

 condyle shows that there was a better development of the 



