FISHES — SALMONIDAE — FARIO CLARKII. 



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rest do not materially diSer from each other. The eye is large and circular, its diameter being 

 contained about four times in the length of the sides of the head, exactly once in advance of its 

 anterior rim, for, the snout is blunt and rounded off. The upper part of the opercle is narrow, 

 gradually widening towards the sub-opercle, which is largely developed and almost as large as 

 the opercle ; the longest diameter of the two being nearly at right angle with one another. 

 There are eleven flattened branchiostegal rays. 



The anterior margin of the dorsal fin is situated a little nearer the extremity of the snout 

 than the base of the caudal fin. The fin itself is a little higher than long, composed of fifteen 

 articulated rays, the anterior one being a mere rudiment, whilst the others are branched and 

 well developed The adipose is slender and situated opposite the posterior portion of the anal, 

 but extending further back. The caudal is furcated or rather concave posteriorly; the anal 

 is shaped like the dorsal, though smaller. The ventrals are not preserved upon the specimen 

 before us ; even their insertion has been carried away by the rupture of the abdomen, but on 

 specimens from Fort Dallas their insertion is nearly opposite the anterior third of the dorsal fin. 

 The pectorals are rather small, and inserted towards the inferior part of the thorax ; the upper 

 two rays are the largest, the others diminish gradually towards the inferior edge of that fin. 

 Br. 11 : 11 ; D 15 ; ; A 13 ; C 12, 1, 8, T, 1, 10 ; V ? ; P 14. 



The scales are proportionally well developed without being large ; they are irregular in their 

 outline, sub-circular, longer than deep above the lateral line and nearly as deep as long below 

 it, and imbricated for nearly the third of their surface. The lateral line takes a straight course 

 along the middle of the flanks. 



The ground color of the upper regions is bluish grey, with a purplish reflection ; the sides are 

 silvery grey and the abdomen white. The upper surface of the head is black; the dorsal region 

 above the lateral line is studded with irregular black spots and specks, extending likewise to 

 almost the entire surface of the dorsal and to the base of the caudal. Along the tail they are 

 also observed a little way beneath the lateral line. The specimen figured and described still 

 exhibits traces of the patches or transverse bands peculiar to the immature fish throughout this 

 family. 



This species was taken in Catlapootl river, a tributary of the Columbia, on the 2d of August, 

 1853, by Dr. J. G-, Cooper. Two specimens, which we refer to the same species, were collected 

 by Dr. Geo. Suckley at Fort Dalles, on the Columbia river. They are smaller still than the 

 one just described and figured ; the lateral bands and patches are more distinctly marked, whilst 

 the spots or specks are much less distinct. 



Beferences to the figures. — Plate LXXI, fig. 5, represents Fario clarhii, size of life. Fig. 6, 

 a scale taken from the dorsal region. Fig. 7, a scale from the lateral line. Fig. 8, a scale 

 from the abdomen. Figs. 5 — 8 are magnified. 



List of specimens. 



