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 
“ Observatory Inlet Salmon,” described in the same work. 
.The specimen alluded to was collected by Dr. John S. Newberry, under Lieutenant R. S. 
Williamson, in the Des Chutes river, a tributary of the Columbia, Oregon. 
2. SALMO QUINNAT, Richards. 
Plate LXVII. 
Spec. Char.— Body fusiform in profile, compressed; head forming about the fifth of the total length ; maxiliary hone 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 .—DeKay, New Y. Faun. IV, 1842, 242.— Storer Synops. 
1846, 193 — Grd. in Proc. Acad. Nat. Sc. Philad. VIII, 1856, 217. 
Common Salmon, Lewis and Clare. 
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, hut, 
perhaps, not with an entire success. 
Br. 20 : 00 ; D 13 ; 0 ; A 16 ; C 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. 
