306 U. S, P. R. R. EXP. AND SURVEYS ZOOLOGY GENERAL REPORT. 



in the Fauna Borealis Americana, and we are inclined to regard it as identical with the 

 &quot; Observatory Inlet Salmon/ described in the same work. 



The specimen alluded to was collected by Dr. John S. Newberry, under Lieutenant R. 8. 

 Williamson, in the Des Chutes river, a tributary of the Columbia, Oregon. 



2. SALMO QUINNAT, Eichards. 

 PLATE LXVII. 



SPEC. CHAR. Body fusiform in profile, compressed ; head forming about the fifth of the total length ; maxillary bone curved, 

 extending beyond the orbit ; anterior margin of the dorsal equidistant between the extremity of the snout and the insertion of 

 the caudal. Dorsal region olivaceous, studded with irregular black spots ; dorsal and caudal fins similarly spotted. Region 

 beneath the lateral line unicolor, silvery along the middle of the flanks, and yellowish on the belly. Inferior fins unicolor. Head 

 above blackish grey ; sides bluish grey. 



SYN. Salmo quinnat, RICHARDS. Faun. Bor. Amer. Ill, 1836, 219. DEKAV, New Y. Faun. IV, 1842, 242. STORER Synops. 



1846, 196. GRD. in Proc. Acad. Nat. Sc. Philad. VIII, 1856, 217. 

 Common Salmcn, LEWIS and CLARK. 



Of this species we have but a prepared skin, and, to a certain extent, deformed. Still the 

 figure which we give is thought sufficiently accurate, and represents well its specific features. 



The head is elongated and sub-conical, constituting about the fifth of the total length. 

 The maxillary is gently curved, and its posterior extremity extends to a vertical line drawn 

 posteriorly to the orbit ; the teeth being rather slender and acerated. The eye is of moderate 

 development, circular in shape, its diameter entering a little over seven times in the length of 

 the side of the head, and twice in advance of its anterior rim. The opercle is large, broad, and 

 irregularly rounded off upon its posterior margin. The limb of the preopercle is expanded and 

 irregularly rounded off, also, upon its external margin. I find as many as twenty branchiostegals 

 on the left side ; those on the right being not all present, their number cannot be given. 

 They are rather short, as usual flattened, and diminish very gradually from the sub-opercle to 

 the hyoid apparatus. 



The body is compressed, elongated, sub-fusiform, rather thickish upon its middle. The anterior 

 margin of the dorsal fin is equidistant between the extremity of the snout and the insertion of caudal 

 fin. It is a little higher anteriorly than long, and its posterior margin is less than the half of 

 the anterior ; its upper margin is sub-concave. The adipose is slender and arched, its tip 

 extending beyond the tip of the last rays of the anal. The caudal fin is deeply furcated, and con 

 stitutes about the seventh of the total length. The anal is low but long ; its base being greater 

 than the base of the dorsal ; its external margin is sub-concave. The insertion of the ventrals 

 takes place opposite the posterior third of the dorsal. The pectorals are elongated, lanceolate, 

 and about one-fourth longer than the ventrals. We have endeavored to count the rays, but, 

 perhaps, not with an entire success. 



Br. 20 : 00 ; D 13 ; ; A 16 ; 5, 1, 9, 8, 1, 4 ; V 10 ; P 14. 



The anterior two rays in both the dorsal and anal fins are mere rudiments or undeveloped 

 rays. The accessories in the caudal may prove more numerous than we have actually put on 

 record. 



The scales are of moderate development, and conspicuously larger on an area along the middle 

 of the flanks, and which is traversed by the lateral line. They are sub-ovoid in shape, a little 

 narrower anteriorly than posteriorly, upon which margin the concentric stria are obliterated. 

 Those of the lateral line are more irregular in their outline, and proportionally much larger 

 than on the abdominal region, where they are slightly larger than on the dorsal region. 



