THE OSTEOLOGY OF THE DIADECTIDAE 



141 



with the upper portion thickened to receive the alveoli of the great 

 teeth. The teeth are set in shallow alveoli, which do not reach to 

 the outer side of the bone, but are separated from it by a deep groove, 



Fig. 7.— Photograph of the inner surface of the right half of the lower jaw of 

 specimen No. 1076. 



the outer edge of which is formed by a narrow elevated edge of the 

 dentary. In the anterior end of the jaw the teeth reach the outer 



Fig. 8. — Outline of jaw shown in Fig. 7. One-third natural size. 



surface. The anterior portion of the jaw descends slightly to the 

 symphasis. 



The posterior portion of the jaw descends rapidly from the coro- 

 noid; the articular surface is not above the middle half of the jaw. 

 The articulation consists of two deep cotyli elongated in the anterior 



