348 GEOLOGICAL SUEVEY OF THE TEEEITOEIES. 



? Xiphactinus audax, Leidy. 

 Saurocephalus pJilebotomus, Cope. 

 arapahovius, Cope. 



Pachykhizodontid^. 



PacliyrJiizodus caninus, Cope. 



Mngii, Cope. 



latimentum, Cope. 



slieareri, Cope. 

 Umpo nepahoUca, Cope. 



Stratodontid^. 



Stratodus apicalis, Cope. 

 CimoUeJithys sulcatus, Cope. 



setnianceps, Cope. 



anceps, Cope. 



gladiolus, Cope. 

 "? carinatus, Cope. 

 Encliodus calliodon, Cope. 



Fam. ? 



Apsopelix smiriformisj Cope, Hayden's Eeport Wyoming, 1871, p. 423. 



Selachii. 



Galeocerdo crassidens, Cope. 

 Sartvellii, Cope. 



Of the preceding twenty -four species the greater part are physostomous 

 Actinopteri ; and there is no species of a physoclystous familj^ in the 

 list. ISo trace of spines or scales of fishes of the latter character have 

 been yet discovered in strata of this period in the West, thou^gh one 

 {Beryx insculptus, Cope) has been discovered by Dr. Lockwood in the 

 green-sand marl of New Jersey. 



In the second place, it is of importance to observe that the genera 

 have nearly all been obtained from the chalk of Europe. Fortheus is 

 represented, perhaps, by some specimens referred to Hypsodon ; one 

 species of Ichthyodectes is figured by Dixon, from Sussex; and one of 

 Cimolichthys, and Pacliyrhizodus, each. JEnchodus has long been known 

 from Holland, etc. ; Umpo Ajjsopelix and Stratodus being so far the only 

 ones not found in Europe. This is of much interest in every aspect, 

 and points to a synchronism, as generally understood, between the 

 chalk formations of Kansas and of England. 



MOLLUSCA. 



Species of this division of animals are not numerous in the beds of 

 the Niobrara epoch. They consist chiefly of Inocerami of two or more 

 species. Through the kind assistance of my friends, N. Daniels, of Hays, 

 and Dr. J. H. Jane way, post-surgeon at Fort Hajs, I was enabled' to 

 procure a numberof very complete specimens of some remarkable shells 

 from the yellow chalk. They were found on a denuded tract of the yel- 

 low chalk, near the Saline Eiver, and were quite exposed. They resem- 

 ble generally large oysters, some of them measuring as much as twenty- 

 seven inches in diameter. I submitted the specimens to my colleague, 



