Stewart.] Cretaceous Fishes. 313 



the internal side of the symphysis of the form just mentioned. 

 Back of the symphysis there is a slight concavity in the alveolar 

 border, just over the large shallow pit at this point. This pit, 

 which is probably for the Mento-Meckelian ossicle, is much 

 smaller than in SaurOcephalus and -the swelling above it is less 

 pronounced. The alveolar border supports thirty-six teeth, the 

 anterior ones of which are very small and the posterior ones 

 about twice the size of those on the maxilla. The crowns are 

 subcylindric, knife-like, and extend nearly to the coronoid proc- 

 ess, which is rather weak, and not curved upward and outward 

 as in Xiphactinus. The lower border of the bone is very thin, 

 with numerous fine stria* extending obliquely upward and for- 

 ward on both the external and internal sides. 



The articular portion is divided into the dermarticular and 

 antarticular portions. Owing to the crushed condition of the 

 specimens these portions cannot be made out with certainty, 

 but seem to be very similar to the same parts of S. ferox, de- 

 scribed below. The predentary is not preserved in any of the 

 specimens. 



Maxilla : Length of 96.0 mm. 



Depth at center 25.0 " 



LeDgth of palatine condyle 11.5 " 



Number of teeth in one centimeter, 5. 



Length of crown 4.0 mm. 



Breadth of crown 2.3 " 



Depth of bone at palatine condyle .30.0 " 



Mandible : Length of bone from cotylus 116.0 " 



Depth of symphysis 26.0 " 



Depth at coronoid angle 41.0 " 



Length of alveolar border 92.0 " 



Number of teeth in one centimeter, 1. 



Saurodon broadheadi. 



Daptintt8 broadheadi Stewart, Kans. Univ. Quart., vol. vir, pp. 24, 25. 



This species was established upon the left maxilla and one of 

 predentaries found in Wallace county, Kansas, collected by Mr. 

 (ieo. \\\ I looper. The catalogue number of the specimen is 212. 



The maxilla is less elongate and ends more abruptly than in Sau- 

 rocephalus. The antprior border slopes forward more obliquely 

 than in Xiphactinus. The pre maxillary surface is continuous 

 21- vi 



