CLASSIFICATION OF THE THERIODoNTIA. 



87 



further lateral]}' the palatine forms a deep groove, flattening 

 out as it is traced forward until it becomes the nearly vertical 

 surface of that anterior part of the Ijone which bounds the outer 

 side of the posterior nares. The pterygoid flanges are powerful, 

 but difi:er from the ordinary Goi'gonopsid type in that the ecto- 

 pterygoids extend down to their summits. There is a single inter- 

 narial bar whose ridged lower surface lies far above the lower edge 

 of the maxilla. 



Text-figure 25. 



^liirosaurid, ? geii. et sp. 



Dorsal, right lateral, and palatal views of the anterior part ol' a skull. 

 R. 855, B.M.N.H. X 3. 



The palate is of the same type as that of yEluroscmrus felinus. 

 but diflfers in the much smaller development of tooth-bearing 

 ai-eas and in the much more caudal position of the hinder ends 

 of the posterior nares. 



An analysis of the structure presented by a series of animals 

 belonging to the Theriodontia thus suggests that that group is a 



