356 University of Kansas Geological Survey. 



postfrontal suture, is parallel with the median line of the skull ; 

 it then turns obliquely outward, with a gentle convex border, to 

 the middle of the hind margin. The plane of their margins is 

 not more than ten or twelve degrees from the vertical, and is 

 turned outward and forward at an angle of about thirty-five de- 

 grees. The margins are everywhere thin. 



The mandibles have been firmly compressed upon the max- 

 illaries, and are posteriorly somewhat flattened. They are 

 stout and heavy, with a thin inferior margin throughout 

 most of their extent. The genial margin is gently convex 

 and considerably receding. The superior margin was evidently 

 thin, like that opposing it. The articulating surfaces cannot 

 be clearly made out, as the quadrates have been crowded upon 

 them. They appear, however, to be slightly convex. The two 

 sides show no trace of a suture between them. 



The palate is remarkable for its extreme concavity and the 

 anterior position of its choanse. All posterior to the pterygoids 

 has been so crushed that it is impossible to determine the char- 

 acters. 



The pterygoids are short and narrow, concave on the sides, 

 extending out in front to form a rounded, vertical, ectopterygoid 

 process, just in front of which is the distinct, transverse, pala- 

 tine suture. The palatines continue the full width of the ptery- 

 goids in front, and are gently concave, with a rounded margin 

 on the sides as far as the process. These processes curve out- 

 ward and forward nearly horizontally to unite with the maxil- 

 laries, which do not send a distinct process out to meet them. 

 Near the posterior border of the process, well out towards the 

 extremity, there is a small palatine foramen, leading up into 

 the floor of the orbit at about its middle, and vertically below, 

 or a little to the inner side of the innermost part of the superior 

 margin of the orbit. On the left side there appear to be two 

 foramina. Almost from the posterior margin of the palatines 

 the surface begins to ascend obliquely forward, forming a 

 deep channel, which in the anterior half is divided into two by 

 a strong median ridge. Unfortunately, the suture with the 

 vomer cannot be made out. The posterior narial openings are 



