SALMONIDiE. 109 



the sidas, each of them including three or four scales. The un- 

 covered portion of each scale is roundish, and it^ convex centre, 

 having a grayish hue and silvery lustre, is surrounded by a dark 

 border of minute spots, which are deficient or less numerous on the 

 yellowish gray spots, and also on the bluish white belly. The dorsal 

 and caudal fins have the greenish gray tint of the back, and the ven- 

 trals and anals are muddy orange ; this color also partially tinging the 

 pectorals. The irides are bright honey yellow with blue clouds." 



I will merely add to this, that in the colored lithograph, which is 

 beautifully executed, the fish has a bright, clean, silvery appearance, 

 with a prevalence of bluish gray hue, and a silvery belly, precisely in 

 accordance with a description given to me by Prof. Agassiz, of the 

 TruitR du Large, for in this condition I have never myself seen the 

 fish. 



In the drawings by Mr. Cabot, from which the wood-cuts to this 

 paper are taken, and the correctness of which I had an opportunity of 

 verifying by personal inspection during a recent visit to the upper 

 lakes, the Truite des Battures, large plate facing page 104, is of a dark 

 bluish green on the back, fading into a greenish brown about the late 

 ral line, thence into a greenish yellow on the sides, and into bluish 

 silver on the belly, the whole largely marked with distinct irregularly- 

 shaped spots — light green on the dark back, yellowish on the brown 

 green of the sides, and silver on the bluish belly, becoming larger as 

 they descend from the back, and at last melting into the brightness of 

 the abdomen. The dorsal and caudal fins of the same color as the 

 back, with irregular yellowish green spots, the latter faintly margined 

 with dull red ; the pectorals bluish gray, margined with the same 

 color, and the ventrals and anals broadly margined with dusky ver- 

 mUlion. The third variety, the Truite. de Gfreve, is generally of a 

 muddy greenish brown, darker and greener on the back, browner on 

 the sides, and yellovrish gray on the belly. The spots in this variety 

 are much smaller than in that last described, and far less definite both 

 in shape and color, so that the fish might be said to be- mottled or 

 clouded, rather than spotted. The fins are all of the same dull, 

 dingy, olivaceous color, similarly clouded, with the faintest possible 

 indication of a ruddy margin on the pectorals, ventrals, and anals, but 

 no tinge of that color on the caudal fin. Both these varieties I have' 



