DESCRIPTION OF A NEW WIIITEFISII (COREGONUS 

 OREGONIUS) FROM McKENZIE RIVER, OREGON. 



By David Starr Jordan and John Otterbein Snyder, 

 Of Stanford University, California. 



In this paper the description of a new species of whitefish from 

 McKenzie River, in Ore<jon, is presented. 



COREGONUS OREGONIUS Jordan, and Snyder, new species. 

 CHISEL-MOUTH JACK. 



Coregonus wittiamftoni .Jordan and I<]vermann, Fish. North Middle Anier., 

 I, p. 463, 1S98, in part, not of Girard. 



Head 4 in length to base of caudal fin ; depth 5 ; depth of caudal 

 l")eduncle 15; eye 5^ in head; snout 2f ; interorbital space 4; scales in 

 lateral series 8G ; between lateral line and base of dorsal 9 ; between 

 lateral line and base of anal G ; dorsal rays 12 ; anal rays 12. 



Body long and slender, the caudal peduncle narrow; snout very 

 long, the end fleshy, rounded and somewhat turned up; interorbital 

 space broad and convex. Maxillary 4 in head, 2| when measured 

 from tip of snout, its width equal to two-thirds of its length; the 

 upper edge almost straight, the lower broadly and rather evenly 

 curved. Lower jaw much shorter than the upper, the square anterior 

 edge fitting beneath the overhanging upper lip; lateral edge of lower 

 lip thin, broad, and pendent. Branchiostegals 8, broad and leaf-like. 

 Gillrakers G-|-13, short, pointed, and comparatively slender. Eye 

 located nearer tip of snout than edge of opercle by a distance equal 

 to half its diameter; a narrow, thin, adipose lid anteriorly. Open- 

 ings of nostril separated by a valve-like partition. A row of jDromi- 

 nent mucous tubes extending along the suborbital bones, below and 

 behind the eye. 



Scales moderate; 32 tranverse rows between occiput and origin of 

 dorsal; small scales along basal part of adipose dorsal, there being 

 5 or G rows a short distance behind its origin ; a large scale above axil 

 of ventral, the length of which is contained 2:^ times in the length of 

 fin. Laterial line almost i^erfectly straight. 



Proceedings U. S. National Museum, Vol. XXXVI— No. 1677. 



425 



