578 



Mr. D. M. S. Watson 



the inner side of the surangular and angular until it pasi3es 

 inside the splenial nearly to its symphysis. The enormous 

 development of this bone occurs in all Anomodonts, and is 

 no doubt correlated with the great massiveness of the whole 

 jaw. 



TTierocephalia. 



Scymnosuchtis lohaitsi. Broom, is taken as the type of the 

 Therocephalia, of which it is a fairly primitive member. 

 The material on whicli the description is founded consists of 

 the two rami of the same lower jaw, the right of which has 

 the bones naturally arranged and exposed from the outer side, 

 whilst the left has the bones somewhat displaced, the back of 

 the jaw being separated from the front; this jaw is free from 

 matrix on all sides. 



Fig. 3. 



A. Left ramus of lower jaw of Scymnosuchus ivhaitsi, inner aspect. 

 B. Right ramus of the same jaw, outer aspect. Teeth omitted. 

 X h 



The dentary is long and narrow, thick at the symphysis, 

 where it is loosely articulated with its fellow, and thinning 

 otf posteriorly to an oblique feather-edge, which overlaps the 

 surangular and angular. There is a large coronoid process 

 Avhich projects freely above the surangular. 



The splenial is a thin strip of bone lying on the inner side 

 of the dentary, and meeting the corresponding bone of the 



