300 University Geological Survey of Kansas. 



The ethmoid is rather broad posteriorly and pointed anteri- 

 orly. The prefrontals are heavy masses of bone with large 

 facets for the superior condyles of the palatines. The frontals 

 are broad, and each has a prominent ridge extending from near 

 the median line posteriorly, and curving outward to a point over 

 the prefrontals. The parasphenoid is triangular, the base of 

 which is below. The transverse processes are long and not very 

 slender. The orbit is surrounded by quite a heavy ring of scle- 

 rotic bones. 



The centra of several vertebrae are preserved. They are 

 deeply concave and without lateral grooves in the anterior re- 

 gion. The more posterior vertebrae are grooved, and have the 

 ribs attached to small processes of bone which fit into pits on 

 the sides of the centra. 



Ichthyodectes cruentus. Plate L, figs. 8a, 8b, 9, 10a, 10b. 



Ichthyodectes cruentus Hay, Amer. Jour. Sci., vol. vi, 1898, pp. 225-228. 



This species of Ichthyodectes has been recently established by 

 Professor Hay from a fragmentary maxilla and a portion of a 

 mandible supposed to belong with it, from the Butte creek re- 

 gion of western Kansas. Through the kindness of Professor 

 Hay, I have been allowed to examine his type and compare it 

 with a specimen of the same species in our collection, which 

 fortunately is somewhat more complete than his. 



The premaxilla is especially remarkable for its great depth 

 and for the length of the alveolar border. The outer portion of 

 the bone is very convex from before backward, especially so 

 just above the alveolar border, where the bone is covered with 

 minute canals, which give it a somewhat rugose appearance. 

 The inferior third of the bone receives no support from the 

 maxilla, thus causing it to be projected downward to a consid- 

 erable extent. The bone becomes contracted in width supe- 

 riorly, and bears an articular facet above, probably for the 

 ethmoid. The lower portion of the anterior border is much 

 roughened, probably for ligamentous union with its fellow on 

 the opposite side. Alveoli for nine teeth are found, all of 

 which are broken away. 



