252 DK. J. MVRiK ON THE [Mav. 2(i, 



In No. 1, which I shall further describe iu detail, the greatest 

 depth of the body is perpendicular to the front of the dorsal fin ; it 

 is somewhat less than a fourth of the length of the body (not in- 

 cluding the head and tail). The snout is rather blunt and of about 

 equal diameter with the eye. This last occupies one-fourth of the 

 distance between the tip of the snout and the posterior edge of the 

 operculum. A vertical line dropped from the middle of the eye 

 would meet the hinder margin of the maxillary bone ; the eye is 

 0*4 inch in diameter. The angular bend of the hinder margin of the 

 operculum and suboperculum is gently rounded ; the praeopercu- 

 lum is still less angular in fact. The interorbital space is slightly 

 convex transversely and autero-posteriorly ; it is as broad as the 

 diameter of the eye. The occiput is rather prominent, and between 

 it and the interorbital region laterally there is a slight depression. 



There is complete dentition. The vomerine teeth incline to the 

 right and left sides, and are also slightly alternate in jiosition, 

 although apj)arently only one series. The palatine teeth aie more 

 linear in their arrangement, and do not on either side extend so far 

 back as the vomerine. 



The dorsal fin has fourteen rays, the anterior two being shorter 

 than the third. The posterior margin of the dorsal fin is nearer 

 the adipose fin than its anterior edge is to the occiput. The adipose 

 fin is dark-coloured, and not red as in the Trout. It is 08 of an 

 inch apart from the first caudal ray. The caudal fin is posteriorly 

 incised ; the lower fork appears a little larger than tlie u})per. 

 Tail-rays thirty-six in number, the U})per and lower or anterior ones 

 being very short. The anal fin possesses twelve rays ; its length is 

 greater than its basal attachment ; the third, fourth, and fifth rays 

 are the longest. During life the lower corner of this fin is more 

 rounded than our illustration depicts. Each ventral fin is about the 

 same length as the anal (to its furthermost point) ; but the ventral 

 is considerably shorter than the pectoral. Its attached root is rather 

 in advance of a vertical line from the posterior end of the base of 

 the dorsal fin ; its rays number nine. The pectorals are attached 

 to the thoracic walls immediately beneath the opercular angle; they 

 have thirteen rays apiece. 



With respect to the number of scales, taken in linear series lon- 

 gitudinally and transversely to the axis of the body, to which some 

 ichthyologists attach considerable value as a specific test among the 

 Salmonoids, I regret that circumstances prevented me irom counting 

 them with such rigid accuracy as could have been desired. Eager 

 to get as correct a sketch of the natural colours as possible, I left 

 over their numeration until the artist had finished, and found that 

 in consequence the body had got somewhat rubbed. It is merely an 

 approximation to the truth, then, when I state there are 120 or 122 

 scales along, but above, the median lateral line. An oblique series 

 from the lateral line up to the dorsal fin numbered nineteen. 



No measurements of No. 2 have yet been taken ; the subjoined 

 are those of the male. No. 1 . The better to compare this fish with 

 well-authenticated specimens of joung Salmon and of liybrids of 



