THE SKULL OF REPTILES 



31 



The splenial (sp), entering into the Meckelian symphysis primi- 

 tively (Figs. 15-18), extending back to the posterior inferior Meckel- 

 ian foramen, articulating with the dentary, coronoid, prearticular, 



Fig. 17. Diadectes {Nothodon). Cotylosaur: left mandible, 

 from within. One half natural size. 



Fig. 18. Pantylus. Cotylosaur: A, right mandible from inner side; B, the same 

 from above; C, the same from below; D, sections corresponding to letters. 



and angular, is not infrequently absent. In Pantylus (Fig. 18) only, 

 so far as known, the posts plenial corresponds to its posterior part as 

 in the known Stegocephalia (Fig. 15). It [the splenial] never bears 



