334 University Geological Survey of Kansas. 



while the internal is nearly smooth and deeply grooved. The 

 articular portion sends a long, sword-shaped process forward, 

 but how far cannot be determined, as the anterior portion is 

 covered by the overlying ceratohyal. The cotylus is very broad 

 transversely but has no great vertical extent. It is composed 

 of two concave facets separated from each other by a well- 

 marked ridge. The external of these facets seems to be slightly 

 .the larger of the two. 



Premaxilla : Length 117 mm. 



Maxilla : Length ( estimated ) 114 " 



Dentary : Length of alveolar border to last tooth 182 " 



Length of mandible from cotylus 252 " 



Transvere diameter of cotylus 14 " 



Length of articular from cotylus ( estimated) 133 " 



The quadrate is compressed and fan-shaped ; extending down 

 its posterior border there is a deep groove, which probably 

 accommodates the preoperculum. Just in front of this 

 groove, on the internal side, there is still another groove 

 which extends over half way down to the condyle, in which the 

 symplectic probably fits. Cope 91 was unable to discover a sym- 

 plectic in the specimen of E. semianceps which he described, 

 and I am inclined to think he was of the impression that this 

 genus did not possess this bone, but from the presence of this 

 groove we can assume that it was proportionately broader than 

 in the Saurodontidse. The anterior border is very thin and is 

 projected upward, with a small portion of the superior border, 

 into quite a prominent process of bone. The condyle is bifur- 

 cate in the center and has a superficial resemblance to the distal 

 end of the mammalian femur. The external side cannot be 

 seen. 



The preoperculum is long and very slendor in the superior 

 portion*. Near the lower extremity the bone bends suddenly 

 forward and broadens out into a thin plate below. The upper 

 portion is only slightly curved and very roughly and irregularly 

 marked. A portion of one operculum is present, showing the 

 internal side. It is a broad, thin plate of bone, with a small 

 condyle for the hyomandibular. The condyle is not situated so 



91. Cret. Vert. West, p. 229. 



