156 SALMONIDJS. 



Fario ara-yreus, Cr'(Va/-rf, P/-OC. Acad. Nat. Sc. I'hilad. 1856, p. 218 ; 

 and U. S. Par. Ji. E. E.ip. Fish. pi. 70, p. 312. 



B. 14. D. 13. A. 15-17. L. lat. 125-130. L. transv. ?^. 

 Csec. pyl. 73. Vert. 64. 



In habit similar to Sahno salar. Prajoperculum irregularly cres- 

 cent-shaped, with the margins rounded, and with the angle very 

 obtuse ; it is very broad, as broad as, or broader than, the orbit. 

 Vomerine teeth rather feeble, in a single series, a part of them being 

 lost with age. Teeth on the tongue present*. The scale-like ap- 

 pendage in the axil of the ventral long, half as long, or more than 

 half as long, as the fin. Caudal fin forked. There are twelve scales 

 in a series obliquely descending forwards from the axil of the adipose 

 fin to the lateral line. 



A male, 32-4 inche.s long, from the Yukon River. — Snout very much 

 produced, both jaws forming a hook, the upper being bent down- 

 wards, the lower upwards. The intermaxillary teeth and the an- 

 terior ones of the lower jaw are exceedingly strong, especially the 

 pair nearest to the symphysis, and hook-like. The maxillarj' is feeble, 

 extending far beyond the orbit. Skin thickened, especially on the 

 back. Caudal fin with the outer rays more than t\vice as long as 

 the inner ones. Belly dark brown. 



A male, 23 inches long, from Vancouver Island diff'crs from the 

 former only in ha\'ing the jaws less curved into a hook. The teeth 

 on the tongue form two series, and are rather strong and closely set. 



A male, 20 inches long, evidcntlij talrn hefore spawning, has the 

 snout pointed, but none of the jaws are bent ; the maxillary is rather 

 feeble, extending backwards to below the hind margin of the orbit. 



A female, 22 inches long (skin from PaUas's Collection), has the 

 snout much shorter, and a feeble maxillaiy which just reaches to 

 below the hind margin of the orbit. The skin is scarcely thickened, 

 the scales on the back being very small. 



Females, 12 inches long, from Vancouver Island, do not differ from 

 older ones, except in having the caudal fin more deeply excised, the 

 length of the middle rays being two-fifths of that of the outer ones. 

 These specimens are silvery, immaculate, with the exception of a few 

 spots on the head. Dorsal and caudal fins blackish. 

 a. Male, 23 inches long : stuffed. Vancouver Island. Collected by 



Mr. J. K. Lord. 

 h. Female, 12 inches long. Esquimalt Harbour. Collected by Mr. 



J. K. Lord ; presented by Earl RusseU. 

 c. Female, 13 inches long. Esquimalt Harbour. Collected by Mr. 



J. K. Lord ; presented by Earl Russell. 

 d-e. Young. Bay of San Francisco. Purchased of 'Mr. Gruber. 



Besides the specimens mentioned, I have had for comparison the 

 typos of S. dermafinus (Richards.), S. consuetus (Richards.), and two 

 flat skins from PaUas's Collection, about which a few words must 

 be added. They are marked " 91 . Salmo leucichthgs " and " 76. Sal- 



* They arc lost in the typical specimen of .S. dermafinus, which is probably 

 accidental. 



