682 PKOF. T. H. HUXLEY OBSERVATIONS 



Pigs. 1-6. — Diagrammatic views of the Skulls of Hyperodapedon.. 



proportion? 



Pig. 1. — Skull of Hyperodapedon, side view. 



Pig. 2. — Incomplete Skull of JRhyncJiosaurus, side view. 



straight part, there is a strong conical tooth, the hase of which is 

 imbedded in the substance of the ramus. This is followed by a 

 series of distinct, acutely conical, teeth (also ankylosed to the jaw) ; 

 these increase in size backwards up to the last three, which gradu- 

 ally diminish. The anterior six or seven of these teeth are very 

 close set, but quite separate. 



In Hyperodapedon, the mandibular rami are extremely massive, and 

 are ankylosed together in front, throughout their long symphysis 



