1. SALMO. 45 



The anal fin is one-third higher than long, and consists of thirteen 

 rays, the first two being rudimentary and covered by the skin ; the 

 third slightly shorter than the fourth and fifth, which are branched 

 rays and the longest of the fin ; the last ray is cleft to the base. 

 Pectoral longer than the postorbital length of the head by one- 

 fourth of that length : ventral shorter, its length being a little less 

 than two-thirds of the distance of its root from the vent ; its outer 

 ray is in the vertical from the eleventh of the dorsal. Posterior 

 margin of the caudal distinctly emarginate. 



There are 120 transverse series of scales counted immediately 

 above the lateral line : the series descending obliquely backwards 

 from the origin of the dorsal fin to the lateral line contaius twenty- 

 eight scales, and there are twenty-two lougitiidinal series between 

 the lateral line and tlie root of the ventral. The transverse scries 

 descending forwards from behind the adipose fin contains fourteen 

 scales. AU the scales are roimded behind. 



Back brownish green, passing into silvery on the sides ; scattered 

 black spots of an irregular X-shape along the sides above the lateral 

 line, and a few similar ones on the anterior part of the body below 

 that line ; the operculum has one very distinct black spot in the 

 centre. Dorsal fin with three series of black spots ; the other fins 

 immaculate, and with a very slight greyish tinge. 



Description of a young Male, in the Smolt-state {before going 

 down to the sea), from the Rhymneij. 



inches. 



Total length 6| 



Greatest depth of the body 1-| 



Length of the head 1-jL 



Girth of the biggest part of the body 3|- 



Least depth of the tail ^ 



Girth of narrowest part of the tail 1|- 



Distance between end of snout and eye f 



Length of maxillary bone ^ 



Distance between eye and angle of praeoperculum .... ^ 



Greatest mdth of operculum f 



Greatest depth of operculum ^ 



Distance between occiput and origin of dorsal fin ... . 1| 



Distance between end of dorsal and root of caudal . . 2^-^ 



Length of base of dorsal f 



Greatest height of dorsal \^ 



Length of pectoral 1 



Distance between root of pectoral and root of ventral . If 



Length of ventral fin f 



Distance between root of ventral and origin of anal fin 1 j^ 



Length of anal fin ^ 



Greatest depth of anal f 



Length of longest caudal ray |- 



Length of middle caudal ray -^-^ 



