1883.] NATURAL SCIENCES OF PHILADELPHIA. 153 



VI. Silver Lake. 

 Salmo purpurafus Pall. Myloleucus formosus Givd. 



VII. Abert's Lake. 

 Salmo vurpuratus Pall. Myloleucus formosiis Gird. 



Apocope vulnerata Cope. 



VIII. Weber River, Utah. 

 BhinichthystransmontanusCoT^e. Squalius montanus Cope. 

 Agosia novemradiata Cope. Pantosteus platyrhynchus Cope. 



IX. Fossil Lake, Oregon. (Fossil.) 



Leucus altarcus Cope. Catostomus labiatus Ayres. 



Myloleucus gibbarcus Cope. Catostomus batrachops Cope. 

 Gliola angustarca Cope. 



Examination of the preceding lists discloses the following 

 facts: (1). The species of Leucus replace in Pj'ramid Lake the 

 3Iylo1eucus of the other lakes. (2). All the species of Pj-ramid 

 Lake are peculiar to it, excepting the Catostomus te7ioensi.s', which 

 is found in the third (and probably other) Warner Lakes, one 

 hundred and fift^' miles north of it. (3 \ The Myloleucus formosus 

 inhabits the eastern line of lakes — "Warner's, Abert's and Silver 

 Lakes; while the M. paroranus is confined to the more western 

 lakes, the Goose and Klamath. (4\ The distribution of the 

 Catostomi is similar; the G. tahoensis being the eastern, in 

 Pyramid and Warner's Lakes, and the C. labiatus in the Goose 

 and Klamath Lakes. 



The distribution of the other species is not sufficiently known 

 to enable us to draw any conclusions regarding them. 



II. The Fauna op the Idaho Lake. 

 RAIIDJE. 



Baia pentagona Leidy, Oncohatis pentar/onns Leidy, Proceeds. Phila. Academy, 

 1870, p. 70. 



A species said to have been found in the beds of this deposit. 



It ii8 referred to a new genus, by Leidy, who, however, does not 



characterize it. 



CYPRINIDJE. 



This family predominates over all othei's in the number of 

 species and individuals. Typical carnivorous forms (Squalius) 

 were not rare, but the greater number of genera are carnivorous 

 with the teeth less (^LeucuSj Myloleucus) or more {Mylocyprinus) 



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