1. SALMO. 125 



52. Salmo immaculatus. 



Storor, Bost. Journ. Nat. Hist, 1850, vi. p. 264. 

 D. 9. A. 11. V. 9. 



Length of head about one-sixth of the length of body ; depth of 

 head two -thirds of its length; greatest depth of body, directly in 

 front of dorsal fin, equal to length of head. Upper jaw the longer. 

 Jaws with numerous sliarj) incurved teeth. Eyes laterally elon- 

 gated ; their diameter one-third the distance between them. Oper- 

 cles rounded posteriorly ; lower portion of operculum naked, marked 

 with concentric striae ; prfeoperculum larger than in S. fontinalis. 



Scales larger than those of S. fontimdis. 



The dorsal fin commences just anterior to the median line ; it is 

 nearly quadrangular. Adipose fin situated at a distance back of the 

 first dorsal little less than one-half of the length of the fish. 



Pectorals beneath posterior angle of operculum ; their length 

 three-fifths of that of the head. Ventrals beneath posterior portion 

 of fii'st dorsal ; the scales at their base very large. 



The anal is situated at a distance back of the ventrals equal to 

 length of head, and terminates directly beneath the adipose fin ; 

 caudal deeply forked ; its length equal to depth of body. 



Silvery on sides and abdomen ; darker on back. No spots. 



Only a single specimen, thirteen inches and a half long, of this fish 

 taken, and that by a gill-net stretched across the mouth of a brook 

 flowing into Red Bay, Labrador. 



Second subgeueric groiij). Salvelini. 



Salvelini, NiUs. Skand. Faun. Fisk. p. 368. 

 Salmo, sp., Cuv. ^ Val. 



Teeth on the head of the vomer only from the earliest age of the 

 individuals. 



Most of these fishes, viz. the Charr proper, have a series of teeth 

 along the median line of the hyoid bone : Rapp has proposed for 

 them the generic name of Umhla (Fische des Bodeusee's, p. 35). 

 Others, like S. hucho, lack these teeth, and may be united under the 

 name of Hucho. Probably some of the species described by Pallas 

 should be referred to this latter group. However, as the dentition 

 of these fishes is veiy imperfectly known, this division can be merely 

 indicated at present. 



I. Europe. 

 1. Salmo umbla. 



Ombre chevalier ; Rothel. 



Salmo Lemani lacus, seu Umbla, Rondel, ii. p. 160. 



Salmo no. 7, Artedi, Synon. p. 25 ; and no. 9, Genera, p. 13. 



Salmo umbla, L. Syst. Nat. p. 511; Bl., Jnrine, Poiss. du Lac Leman, 

 pi. 5 ; Af/ass. Poiss. d'eau duuce, pis. 10 & 11 ; Cuv. iSi" Val. xxi. 

 p. 233; Meckel, Reisebericht,in Sitzgsher. Akad. Wiss. Wien, 1851, 

 July, p. 93 ; Pnpp, Fische d. Bodensee's, p. 32, taf. 5 (fig. optima) : 



