314 University Geological Survey of Kansas. 



with the outer surface of the maxilla and is provided with numer- 

 ous small protuberances, which probably fit into corresponding 

 depressions in the premaxilla. It is seen from the above that the 

 pre maxilla is not so immovably fixed as in Xiphactinus, where 

 this bone fits into a deep depression on the maxilla and has a 

 thin lamina of bone extending forward nearly to the anterior 

 extremity, which gives it additional support. The ramus is 

 thin above and thickens but slightly at the alveolar border. 

 The bone does not materially thicken below the palatine condyle 

 as in Xiphactinus, and the anterior condyle is situated much 

 nearer to it than in this form. The palatine condyle is elon- 

 gated, elliptical, nearly flat, and does not have the internal 

 notch found in S. phlebotomus . The teeth are closely set, with 

 compressed, knife-like crowns and smooth enamel surface, ap- 

 pearing very slightly striated under the microscope. Alveoli 

 for thirty-one are found, below each of which there is a deep 

 notch, characteristic of this genus. 



A predentary was found on the same slab with the above 

 which has the form of the predentary of Saurocephalus. It is 

 short and triangular, the posterior surface of which is very 

 rough for cartilage, binding it to the sj 7 mphysis. The upper bor- 

 der is edentulous, the lower thin and sharp, and the two meet 

 at quite an acute angle in front. 



Maxilla: Length (estimated) 122.0 mm. 



Depth at center 37.0 " 



Depth at palatine condyle 44.0 " 



Number of teeth in one centimeter, 3.5. 



Predentary : Length (estimated) 30.0 mm. 



Depth at symphysis 28.5 " 



Saurodon xiphirostris. Plate LV. 



Saurodon xiphirostris Stewart, Kans. Univ. Quart., vol. vn, p. 178. 



This specimen consists of a skull crushed obliquely, the centra 

 of several vertebrae, and also a portion of a shoulder girdle in a 

 very bad state of preservation. The specimen is of nearly the 

 same size as that of the type of Saurodon (Daptinus) broadheadi 75 

 described by myself. 



75. Kans. Univ. Quart., vol. VII, pp. 21-29. 



