582 



E. B. BRANSON 



The surangular is large. It articulates with the angular below 

 in a line that runs diagonally from the postero-inferior angle of the 

 jaw to a point just below the anterior end of the coronoid. Above 

 it articulates with the dentary and articular, and forms part of the 

 outer boundary of the supra-meckelian foramen. It is coarsely 

 pitted posteriorly with coarse ridges running upward and forward 

 from the pitting. 



i n. f 



Fig. 4. — Anaschisma brachygnatha; right ramus of mandible, one-fifth natural 

 size. 



a, angular; c, coronoid; d, dentary; inf, internal mandibular foramen; paa, supra-meckelian 

 foramen; sp, splenial; ?, probably a separate element; pr, prearticular. 



f^^rt^^fl^i 



Fig. 4a. — Anaschisma browni; outer view of right ramus of mandible, one-third 

 natural size. 



a, angular; ar, articular; d, dentary; sa, surangular. 



The dentary forms the upper half of the jaw in front of the middle 

 of the supra-meckelian foramen. It is not sculptured. The teeth are 

 set on the top of the inner side, and on the outer side there is a high, 

 thin parapet which forms the outer margin of the jaw, and in which 

 the outer sides of the teeth are imbedded for the height of i cm or 

 more. 



The coronoid is a small element at the anterior end of the supra- 

 meckelian foramen. The main part of it forms the front margin 

 of this foramen. The anterior part is slender and triangular, and 

 is wedged in between the splenial and dentary. 



The splenial extends from the prearticular to near the symphysis, 



