•1870.] ^"^^ LCope. 



This specimen was found by J. C. Sclienk for Capt. Clarence King, at 

 Castle Creek, Idaho. No. 9790 Smithsonian Collections. The other 

 specimens are from Catharine's Creek, Idaho ; Nos. 9785 — 978G. A por- 

 tion of a maxillary of one of these forms indicates a fish half as large again 

 as the one above described. 



Genekal Observations. 



The six genera of fishes above described, present interesting relations 

 to existing ones. One of them, Semotilus, is recent, while three are 

 closely allied to existing genera ; viz. : Rhabdofario, Anchybopsis, and 

 Oligobelus. Distichus and Mylocyprinus are less nearly related to living 

 genera. The five representing the Cyprinidse can be referred to the 

 groups into which the existing members of the family fall ; thus Semotilus 

 and Oligobelus are carnivorous, and Anchybopsis and Mylocyprinus 

 herbivorous and molluscivorous. Accompanying these fossils are three 

 species of the recent genus Astacus, (A. subgrundialis, etc ) which I de- 

 scribe in the Proceedings of the American Entomological Society for 1870. 



The molluscs of this foi-mation have already been described by F. B. 

 Meek, and they, like the fishes, determine it to be lacustrine and fresh, 

 as already stated by Prof. Newberry. The species are stated by Meek * 

 to be distinct specifically, and in some cases generically, from all others 

 hitherto described from the West. Leidy observes,! that Mammalian 

 Remains received from Capt. King's expedition include portions of Mas- 

 todon mirificus and Equus excelsus, which indicate an age similar to that 

 of the bad lands of the Niobrara, which Hayden calls Pliocene. 



The remains described in this paper furnish few means of detei-mining 

 the age of the deposit. There is, however, a great probability af their 

 being later than Miocene, and nothing to conflict with their determination 

 as of Pliocene age. 



It may be added that numerous portions of skeletons of fishes remain, 

 to be identfied, in Capt. King's collection 



ON THE ADOCID^. 



BY E. D. COPE. 



ADOCUS. Cope. 



Proceed. Acad. Nat. Sci., Phila., 1868, 235. Proceed. Amer. Philbs.. 

 Soc, 1870, 295 ; Transac. Am. Phil. Soc, 1869, 232. 



Additional material enables me to add important characters to this 

 genus, and to define its position with something like precision. 



In the first place I find that it possesses a large intergular plate. This 

 I have verified on A. beatus and A. syntheticus, sp. nov. Having also 

 perfect xiphisternal bones of these two species, I can show that there is 

 110 sutural attachment for the pelvic bones. The coexistence of these 

 two characters has been hitherto universal, and the present deviation 

 from it is a point of much interest. Instead of sutural surfaces, there 



* Proc. Acad. Nat. Sci., Phila., 1870, 56. 

 1 1.0. 1870, 67. 



