>A Vt 



* ^^ 



PALEONTOLOGICAL BULLETIN No. 22. 



[Extracted from the Proceedings of the Academy of Natural Sciences of Philadelphia, 



October 31, 18T6.] 



DESCRIPTIONS OF SOME VERTEBRATE REMAINS FROM THE FORT UNION 

 BEDS OF MONTANA. 



C~ 



BY E. D. COPE. 

 Aublysodon lateralis, sp. nov. 



Established on some teeth, one of which is of the size of those 

 of the A. horridus, and which differ in some important particu- 

 lars. The posterior crenate ridge is as in that species, lateral in 

 position, separating a posterior face from the lateral at a right angle. 

 The posterior face is separated from that of the other side by a 

 very obtuse angle. The anterior aspect of the crown is without 

 crenate cutting edge, but the latter is present as a border to the 

 front, passing along the front of the side opposite to that which 

 bears the posterior angle. It is directed laterally, and projects 

 beyond an open groove which follows its posterior base. The 

 base of the crown is broad elliptic in section. Enamel smooth. 



A much smaller tooth was found with the preceding, and pre- 

 sented similar characters, excepting that the posterior face is not 

 so strongly truncate. 



Measurements. M. 



Length of crown preserved .025 



.018 



Diameter of base of crown \ on & 

 v short 



Width of posterior face 



Length of smaller crown . . • 



Long diameter of base of do. 



.010 

 .006 

 .011 

 .006 



The apices of both crowns are considerably worn by use. Both 

 were found by Charles H. Sternberg of my exploring party. 



Laslaps incrassatus, sp- nov. 



Represented by two teeth, a larger and a smaller, which were 

 found near each other, but not sufficiently so as to warrant the 

 belief that they pertain to the same individual. 



The characteristic feature of these teeth is, that the transverse 

 diameter of the base of the crown exceeds its anteroposterior, a 

 point in which it differs from all the other carnivorous dinosau- 

 rians yet known from the formation. Nevertheless, the posterior 

 cutting edge is median, and is denticulated. The anterior cutting 

 edge, which is also denticulated, is nearly median at the apex, but 



