336 University Geological Survey of Kansas. 



clined to think that it represented a superior or inferior phar- 

 yngeal. In all of the specimens that I have examined it seems 

 to be entirely symmetrical, and in one specimen it is in place 

 at the anterior extremity of the skull, so there can be no doubt 

 of its being an ethmoid. I am inclined to think that the 

 asymmetry of Cope's specimen was due to distortion. The an- 

 terior end is extended forward into a beak of dense bone, which 

 is directed sligiitly downward. Just back of the beak, on the 

 lower side, there are a number of small teeth, which are ele- 

 vated considerably above the rest of the bone when it is re- 

 versed. There seems to be a great deal of irregularity in the 

 arrangement of these teeth. In some specimens they are 

 grouped together, with the largest near the center, while in 

 others there are a number of large teeth anteriorly, with a 

 single row of smaller ones extending back from them. The 

 upper surface of the bone is covered with numerous stria^ radi- 

 ating from the apex. 



There are fragments of other bones whose location cannot be 

 determined. One of these is a long bar of bone which has an 

 articular surface at the anterior end and is expanded at the 

 other ; another is a flat semicircular plate, finely striated ; while 

 others are irregular in outline. 



The whole of the upper part of the skull is preserved, either 

 by the bones themselves or by their impression in the chalk. 

 It is very flat and bears a marked resemblance in general out- 

 line to the top of the skull of Stratodus. The frontals form the 

 greater part of the upper walls of the skull and the two are 

 separated by a well-marked suture in the median line. The 

 two bones together are somewhat triangular in outline and are 

 beautifully sculptured, on the upper surface, by radiating 

 ridges. These ridges are especially marked just internal to 

 the postorbitals, from which point they radiate toward the 

 front and back of the skull. They are in contact with the 

 supraoccipital posteriorly. The supraoccipital enters but little 

 into the top of the skull. It projects backward in a small 

 crest, which is probably not raised above the rest of the skull. 

 The postorbitals form beak-like processes on the sides and are 



