322 University Geological Survey of Kansas. 



nearly half as deep as the corresponding part in Xiphactinus . 

 The superior articular surface is small and oval in outline, 

 while the lower is larger and more elliptical. The depth of the 

 malleolar portion is 20 mm. 



The hyomandibular is very similar to that found in Ichthyo- 

 dectes. The superior condyle is elongated, and depressed in the 

 central portion. In the skull of S. intermedins, figured by 

 Newton, 85 this condyle is shown to be regularly rounded from 

 before backward. As all the figures and descriptions of the 

 hyomandibular of this family and the Ichthyodectidfe show the 

 depression described above, I am inclined to think that this 

 portion may have been distorted in the specimen figured by Mr. 

 Newton. Extending downward from the anterior and posterior 

 angles there are two slight ridges, which converge toward the 

 center and form a much larger one, which extends downward to 

 nearly the lower extremity of the bone. It forms the outer 

 border of the groove for the preoperculum. There is also 

 another ridge on the internal side, just in front of the condyle 

 for the operculum, but it is not so prominent as the one just 

 mentioned. The condyle for the operculum is elongated, as in 

 Ichthyodectes. 



The lower extremity of the bone presents an articular surface 

 similar in size and character to that found at the upper end of 

 the symplectic. I think it is very likely that these two bones 

 articulate at this point. 



A small portion of a scapula is preserved. It shows only two 

 distinct articular condyles, one large and one small, instead of 

 three, as in Xiphactinus. Portions of several spines are pre- 

 served, of which one complete and a portion of another are 

 shown in the figure and need no further consideration. 



The first anterior vertebra has the posterior end deeply con- 

 cave, but the anterior end is not so deep, and has a slight pro- 

 tuberance projecting forward above. On the superior surface 

 there are two deep, rounded pits for the neurapophyses ; aside 

 from this there are no other grooves displayed upon the centra. 



A small toothed element was found on the internal side of one 



85. 1. c, pi. xxxiv. 



