346 University Geological Survey of Kansas. 



ridge which continues upward to the superior border. The 

 groove for the symplectic seems to be very small. 



One specimen shows the top of the skull with most of the 

 bones in place. The frontals are long, extending backward as 

 far as the pterotics externally. They meet in the median line 

 by a suture which is probably dentate, although this cannot be 

 determined with certainty. On each side there is a small post- 

 orbital process. The bones are beautifully sculptured above 

 with coarse sulci, which radiate from near the centers of each, 

 internal to the postorbital processes. The parietals are small, 

 meet each other in the median line, and are covered with mark- 

 ings very similar to those on the frontals. The supraoccipital 

 is in a poor state of preservation, but probably entered but little 

 into the formation of the upper part of the skull. It seems to 

 have been projected backward for quite a distance and was de- 

 pressed, as is the rest of the top of the skull. The epiotics and 

 pterotics seem to be united on the side of that skull in which they 

 are preserved. The pterotics form prominent angles of the 

 skull, while the epiotic processes are not so prominent. The 

 two are covered with small pits and tubercles of bone. Just 

 back of the skull there are portions of two other bones, which 

 may be parts of the hyomandibular and supratemporal. The 

 first of these presents two articular surfaces, one of which is 

 extended outward from the rest of the bone, the two being sepa- 

 rated by a wide space somewhat similar to that found in the 

 hyomandibular bone of Empo. The other is an irregularly 

 shaped bone and has an articular surface on the side next to 

 the skull. There are numerous other small bones, sculptured 

 in a manner similar to the bones of the top of the skull. Three 

 of these are joined together in a chain, and from their position 

 would indicate that they might form a part of the rim of the 

 orbital cavity. The remainder of these bones are small and 

 scattered along the top of the skull, indicating that this part 

 was covered with dermal plates. The orbital cavity is quite 

 large, and the orbit is surrounded by a very thin ring of bone, 

 the number of pieces composing which cannot be determined, 

 owing to their fragmentary condition. Just in front of the or- 



