1. SALMO. 43 



the operculum is very slightly rounded, and placed at a right angle 

 to its lower margin ; the angle of the suboperculum is also rounded. 

 A line taken from the upper end of the gill-opening to the angle of 

 the operculum is one-eighth of an inch longer than one from that 

 point to the lower anterior angle of the suboperculum. 



The distance of the origin of the dorsal fin from the occiput, if 

 carried back from behind that fin, reaches to a little less than half- 

 way between the adipose and the root of the caudal. The dorsal fin 

 is a little shorter than high, and composed of fourteen rays, the three 

 anterior ones being rudimentary and enveloped in the skin, whilst 

 the fourth is simple, shorter than the fifth and sixth, which are 

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



The length of the base of the anal fin is about two-thirds of its 

 height, and the fin is composed of eleven rays, of which the first and 

 second are rudimentary and enveloped in skin, the third simple and 

 much shorter than the fourth, which is also simple ; the fifth is the 

 first branched ray and the longest of the fin ; the last ray is cleft to 

 the base. The pectoral fin slightly exceeds in length the postorbital 

 portion of the head : ventral fin shorter, its length being rather more 

 than one-half of the distance of its root from the vent ; its outer ray 

 is in the vertical from the tenth of the dorsal. Posterior margin of 

 the caudal fin emarginate. 



There are 130 transverse series of scales, counted immediately 

 above the lateral line on one side of the body, and 121 on the other ; 

 but it is to be noticed that the series are not quite as regular as is 

 usually the case ; the transverse series descending obliquely back- 

 wards from the origin of the dorsal to the lateral line contains twenty- 

 five scales, and there are twenty longitudinal series of scales between 

 the lateral line and the base of the ventral. The transverse series 

 descending from behind the adipose fin to the lateral line is composed 

 of fifteen scales. All the scales are rounded behind, but less obtusely 

 than in larger specimens. 



Back greenish ; sides and belly silvery ; scattered black X-shaped 

 spots on the sides above the lateral line, and sparingly on the an- 

 terior part of the body below that line. Dorsal fin with two or three 

 series of black spots ; other fins immaculate, with a blackish tinge. 

 Operculum with a single rounded black spot. 



Description of a Female specimen in the Grilse-state, with thirteen anal 

 r^ys ; caught in the Rhymney in the month of August. 



inches. 



Total length 11| 



Greatest depth of the body 2\ 



Length of the head i . 2^ 



Girth of biggest part of the body 51^ 



Least depth of the tail 1 



Girth of narrowest part of the tail 2^ 



Distance between end of snout and eye ^ 



Length of maxillary bone ^ 



