348 GEOLOGICAL SUEYEY OF THE TEREITORIES. 



^. XipJiactiniis audax, Leidy. 

 Sauroceplialus iMehotomns^ Cope. 

 arapahovius, Cope. 



Pachyehizodontid^. 



Pacliyrliizodus caninus^ Cope, 



'kingii, Cope. 



latimentum, Cope. 



slieareriy Cope. 

 Empo nepalioUca, Cope. 



Stbatodontid^. 



Stratodus a2)icaJis, Cope. 

 CimoJichthys sidcatus. Cope. 



semianceps^ Cope. 



anceps, Cope. 



gJadioJus, Cope. 

 ? carinatHs, Coi^e. 

 Uncliodus caUiodon^ Cope. 



Fam.? 



Apsopelix saurifonnisj Cope, Hay den's Eei)ort Wyoming, 1871, p. 423. 



Selachii. 



Galeocerdo crass idens, Cope. 

 MartveUiij Cope. 



Of the preceding twenty-four species tlie gTeater part are pbysostoraons' 

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

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

 been yet discovered in strata of this period in the West, though one 

 [Beryx inscidjytus, Cope) has been discovered by Dr. Lockwood in the 

 grecD-sand marl of Xew Jersey. 



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

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

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

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

 CimoJichtliys, and Pachyrhizodus, each. Encltodus has long been known 

 from Holland, etc.; Empo Apsopelix and Stratodus being so far the only 

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

 and j)oints to a synchronism, as generally understood, between the 

 chalk formations of Kansas and of Eu-iland. 



'O' 



MOLLUSC A. 



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

 the Xiobrara epoch. They consist chiefly of Ptwcerami of two or more 

 species. Throngh the kind assistance of my friends, X. Daniels, of Hays, 

 and Dr. J. H. Janeway, post-surgeon at Fort Ha^^s, I was enabled to 

 procure a number of ver\' complete specimens of some remarkable sbeDs 

 rrora 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 sx^ecimens to my colleague, 



