52 SALMONID^. 



line be taken from the upper end of the gill-opening to the opercular 

 angle, and another line from the latter point to the lower end of the 

 suboperculum, the latter line is three-fourths of the length of the 

 former. 



The distance of the origin of the dorsal fin from the occiput equals 

 three-fourths of the distance of the root of its last ray from the caudal. 

 The dorsal fin is longer than high, and possesses fourteen rays, of 

 which the two anterior ones are rudimentary and enveloped in the 

 skin ; the third also is covered by the skin and less than half the 

 height of the fourth, which is simple and about equal to the fifth in 

 height ; the latter is the first branched ray ; the last ray of the fin is 

 cleft to its base. 



The length of the base of the anal is somewhat more than two- 

 thirds of the height of that fin ; there are twelve anal rays, the two 

 foremost being rudimentary and covered by the skin, the third simple 

 and not quite as long as the fourth, which is branched and, with the 

 fifth, the longest of the fin ; the last ray is cleft to the base. 



The length of the pectoral fin is equal to that of the distance 

 between the hinder margin of the operculum and the pupU of the 

 eye. Ventral shorter, equal to rather more than half the distance of 

 its root from the vent ; its outer ray is in the vertical from the tenth 

 of the dorsal. Hinder margin of caudal truncated. 



There are 124 transverse series of scales, counted immediately 

 above the lateral line ; the series descending obliquely backwards 

 from the first dorsal ray contains twenty-eight scales ; that from 

 the adipose forwards to the lateral line has fifteen scales ; and there 

 are twenty-three longitudinal series between the lateral line and the 

 root of the ventral. All the scales are rounded posteriorly. 



Back brownish green ; sides with a reddish tinge ; belly dirty 

 white ; numerous small X-shaped spots are regularly scattered over 

 the back and sides as far as the darker hue of the upper parts pre- 

 vails. The immediate neighbourhood of each spot is reddish. Several 

 round blackish -brown spots on the operculum. Dorsal fin with black 

 spots in several series. The other fins immaculate, with a blackish 

 tinge deepening towards the extremity. 



Description of a Male Hybrid specimen from the Rhymney, captured 

 in the month of October, with the sexual organs normally developed 

 {probably after second return from the sea). 



inches. 



Total length 13 



Greatest depth of the body 2| 



Length of the head 2f 



Girth of biggest part of body 6g 



Least depth of the tail ly^^ 



Girth of narrowest part of tail 2f 



Distance between end of snout and eye ^ 



Length of maxillary bone 1^ 



Distance between eye and angle of pra^operculum . . -| 

 Greatest width of operculum ^ 



