Vol. 56,] 



ARISTODE8MUS RUTIMEYERI. 



623 



much in depth as it extends from front to back. At the angle of the 

 jaw, which is not much behind its middle length, its depth is greatest. 

 The jaw widens transversely from side to side : seen externally on 

 the left side, it is remarkable for the distinct inferior angular 

 process. There is a prominent longitudinal lateral ridge, towards 



Fig. 1. — Inferior aspect of the mandible of Aristodesmus E-iitimeyeri, 

 showing the median suture between the rami, the angle, and the 

 composite structure. {Nat. size.) 



Suture. 



Fig. 2. — Teeth in the mandible. {Nat. size.) 



.rViA 



Cavity in the hinder 

 part of the mandible. 



the base of the jaw, behind the angle, as though for the attachment 

 of the masseter-muscle. There was no heel extending behind the 

 lower jaw. It may be compared with fig. 5, p. 330 in Phil. Trans. 

 Roy. Soc. vol. clxxxiii (1892) B. 



The mandible is not in articulation with the skull, but slightly 

 displaced laterally. The external surface of the dentary bone is 

 tumid, curving forward towards the symphysis. About six teeth are 



2t2 



