The Skeleton 75 



symphysis, is covered with numerous, small, deep 

 pits, while along its inner side, parallel to the row 

 of teeth, is a row of somewhat larger pits like those 

 noted in the maxilla and premaxilla. Articulating 

 with the mesial side of the dentary along the 

 greater part of its length is a flat bone, the splenial 

 (Figs. 23 and 24, 19) ; between these two bones is a 

 long cavity that makes the ramus hollow almost 

 to the symphysis. A large foramen, not shown in 

 any of the figures, leads through the splenial into 

 this cavity. 



Articulating with the caudal end of the splenial 

 and forming the anterior border, as seen from the 

 mesial side, of the large external mandibular foramen 

 (Fig. 23, 27) is a small bone, the coronoid (Figs. 23 

 and 24, 23, Fig. 21, 21); it articulates with the 

 splenial anteriorly, with the supra-angular dorso- 

 caudally, and with the angular ventrally. 



The supra-angular (Figs. 23 and 24, 21, Fig. 21, 

 1 8) is an elongated bone that forms the dorsal border 

 of the external mandibular foramen ; it also forms 

 the lateral edge of the articular surface for the 

 quadrate. It articulates anteriorly with the splen- 

 ial, the dentary, and the coronoid; and posteriorly 

 with the angular and articular. 



The articular (Figs. 23 and 24, 22, Fig. 21, 19), 

 which is scarcely visible in a lateral view, forms 

 most of the surface for articulation with the quad- 

 rate, and sends back the large process so charac- 

 teristic of the crocodilian skull. On the dorsal side 



