FISHES — SALMONIDAE — FARIO GAIRDNERI. 



313 



Fig. 3 is a scale from the lateral line. Fig. 4, a scale from the abdominal region, midway 



between the lateral line and the ventral fins. 



Figs. 2 — 4 are magnified views. 



List of specimens. 



4. FAKIO GAIRDNERI, Grd, 



Plate LXXI, Figs. 1—4. 



Spec. Char. — Body fusiform in profile, very compressed ; head comprised four times in the length, the caudal fin excluded. 

 Upper jaw longest ; maxillary curved, extending to a vertical line intersecting the posterior rim of the orbit. Anterior ma.rgin 

 of dorsal equidistant between the extremity of the snout and the base of the caudal. Caudal ^\a furcated. Back silvery grey, 

 sides silvery, and belly yellowish white. Body obsoletely spotted with black ; similar black spots on the dorsal and caudal fins. 



SfN. — Salmo gairdneri, Richards. Faun. Bor. Amer. Ill, 1836, 221. — DeKat, Now Y. Fauna, IV, 1842, 243. — Storer, 



Synops. 1846, 196. 

 Fario gairdneri, Grd. in Proc. Acad. Nat. Sc. Philad. VIII, 1856, 219. 



The body is fusiform in its outline, but very much compressed and thin, giving it a much 

 narrower back than is generally the case with its congeners. The head constitutes the fourth of 

 the entire length, excluding the caudal fin ; it is sub-conical in shape, anteriorly rounded, the 

 upper jaw slightly overlapping the lower. The mouth is moderately cleft, the posterior 

 extremity of the maxillary extending to a vertical line drawn inwardly to the posterior rim of 

 the orbit, as in Fario clarkii. The teeth generally are less developed than in the latter, in 

 which respect it resembles Fario argyrcus. Those on the tongue are exiguous and far apart in 

 either row ; the pterygoidian teeth are a little smaller than the dentar and maxillar ones ; the 

 vomerians are the stoutest of all, at least those which exist along the shaft of that bone ; for, on 

 the front they are not conspicuous at all. The eye is elongated, sub-elliptical ; its diameter being 

 contained five times and a half in the length of the sides of the head, and abotit once and a half 

 in advance of its anterior rim. The nostrils are situated towards the upper surface of the rostrum, 

 nearer the orbit than the extremity of the snout ; the anterior aperture is sub-circular and 

 larger tha,n the posterior. Twelve branchiostegal rays may be observed on either side. 



The greatest depth of the body, taken in advance of the dorsal fin, is equal to the length of 

 the head ; hence enters four times in the length, the caudal fin excluded. The anterior margin 

 of the dorsal is equidistant between the snout and the insertion of the caudal fin ; its height 

 anteriorly is nearly equal to its length. The adipose is slender and placed opposite the posterior 

 portion of the anal. The caudal fin is furcated and constitutes a little more than the seventh of 

 the total length. The anal has the general shape of the dorsal, but it is deeper anteriorly than 

 it is long. The origin of the ventrals is placed opposite the third ray of the dorsal, but the tip 

 of its rays do not extend posteriorly as far as the tip of the posterior rays of the dorsal. The 

 40 a 



