20 /-■ Hmsakof — N~ew Cyprmid Fish, 



tins, ami the projection of the lower jaw, that the species most 

 probably belongs in the genus Leuciscus. 



It is interesting to note that the fossil has considerable 

 resemblance to Leuciscus balteatus (Richardson), a species now 

 living in the same region and said to be "generally abundant 

 everywhere in the Columbia Basin, and very variable."* It 

 differs, however, in being deeper, in having a larger head, and 

 a longer dorsal, with 14 rays as against 10. The anal in 

 Leuciscus balteatus is given by Jordan and Everuiann as " 11 

 to 22, usually 16," so that the anal of the fossil species falls 

 within this range of variation. 



Six other fossil species of Leuciscus have been described 

 from North America,! but only one is known by a complete 

 fish, the other five — from the Pleistocene of Idaho— being 

 based on pharyngeal teeth. The complete fish is Leuciscus 

 turneri Lucas,:]: from the Miocene of Nevada. From this 

 species the present one differs in proportions, position of the 

 fins and other details. 



Besides the type, I have in hand three other specimens 

 (paratypes) from the same locality, and also collected by Dr. 

 Rose. One is a fish as large as the type but with the fins in 

 less perfect condition and lacking the upper margin of the 

 body. This specimen also belongs to the Geological Survey of 

 Canada. Secondly, two imperfect fishes in the American 

 Museum collection : one, an impression lacking the snout and 

 the lower margin of the body including the pectorals, one 

 ventral and the front portion of the anal ; the other, a poorly 

 preserved mold of a fish about as large as the type with the 

 bone completely weathered awa}' but showing part of the out- 

 line of the body and tracings of the opercular region and of 

 the dorsal and caudal fins. 



The species is named for Dr. Bruce Rose, of the Geological 

 Survey of Canada, who collected the specimens, and kindly 

 placed them at my disposal for study. 



* Jordan and Evermann, Fishes of North America, Pt. I, 238 ; and Pt. IV, 

 pi. xlii, figs. 105, 105a. 



+ 0. P. Hay, Bibliogr. and Catal. Fossil Vertebr., N. Amer., 1902, 396. 



\ F. A. Lucas, A New Fossil Cyprinoid, Leuciscus turneri, from the 

 Miocene of Nevada. Proc. U. S. Nat. Mus., xxiii, 1901, 333-334, pi. viii. 



