292 PROCEEDINGS OF THE NATIONAL MUSEUM. tol. 52. 



Family CYPRINIDAE. 



Genus AMYZON Cope. 



TMs is an extinct genus related to modern suckers, but vnth. a more 

 extended dorsal fin. It is stated by Woodward to be "scarcely dis- 

 tinguishable from Sclerognathus, but with pharyngeal bones expanded 

 behind." Mr. J. T. Nichols has pointed out to the \\Titer that the 

 Canadian species A. hrevipinne approaches very closely to existing 

 buffalo fishes of the genus Ictiohus; and Cope, in his description of 

 Amyzon, has remarked upon its near relations with BubalicMiys. 



AMYZON BREVIPINNE Cope. 



Plate 19, figs. 1, 2. 



Amyzon brevipinne Cope, Proc. Acad. Nat. Sci. Phila., 1893, p. 402.— Lambe, 

 Trans. Roy. Soc. Canada, vol. 12, 1906, pp. 151-155, pi. 1. 



The type of tliis species was obtained from beds in British Columbia 

 supposed to be of late Eocene or early Miocene age. It has never 

 been figured, but one small specimen from Horsefly River, British 

 Colmnbia, and another belonging to a different species (not of A. com- 

 mune, however), have been described and illustrated by Dr. L. M. 

 Lambe mtliin recent years. 



To this species should probably be referred two specimens figured 

 ill plate 19, which were collected in 1910 by ;Mr. J. B. Umpleby from 

 beds of supposed Lower Miocene age, near Republic, Washington. 

 These are now the property of the National Museum, and are cata- 

 logued as Nos. 81 and 8117. Tliey are the largest and best preserved 

 examples of this species yet brought to fight. 



Genus LEUCISCUS Cuvier. 



LEUCISCUS TURNERI Lucas. 



Leuciscus turneri Lucas, 21st Ann. Rept. U. S. Geol. Surv., 1901, pt. 2, pp. 223- 

 224, pi. 31. 



The holotype of this species (Cat. 4302a), and a large number of 

 weU-preserved specimens from the Esmeralda formation in western 

 Nevada, ^re contained in the United States National Museum collec- 

 tion. The age of these beds is discussed by H. W. Turner in the 

 Twenty-first Annual Report of the United States Geological Survey, 

 1899-1900 (part 2, pp. 203-205), and in the same volmne (pp. 209- 

 220) the fossil plants occurring in this formation are described by 

 F. H. Knowlton. 



Nothing can be added to our knowledge of the species beyond the 

 information ah'eady contributed by Dr. F. A. Lucas.^ There may be 

 compared with it, however, a specimen that apparently belongs to 



1 21at Ann. Rept. U. S. Geol. Surv., 1901, pp. 223-224, and Proc. U. S. Nat. Mus., vol. 23, 1900, pp. 333- 

 334, pi. 7. 



