86 BRITISH FRESHWATER FISHES 



dermere, Coniston, Buttermere, and Crummock 

 Water, and presumes that those of the other lakes 

 mentioned belong to the same species. 



In this form, described by Dr. Giinther in 1862, 

 there are eight to ten branched rays in the dorsal 

 fin, and seven to nine in the anal ; the scales in 

 a longitudinal series vary from 160 to 200, i.e. 

 that is the number of oblique rows of scales de- 

 scending to the lateral line ; there are from eleven 

 to sixteen moderately long gill-rakers on the lower 

 part of the anterior branchial arch, and the vertebrae 

 number sixty to sixty-two. 



The adult fish is usually 10 to 12 inches, 

 rarely as much as 18 inches, long, and has 

 nearly the form of a Trout, the depth measuring 

 from one-fourth to one-fifth of the length to the 

 base of the caudal fin ; the snout is subconical, 

 with the jaws equal anteriorly, the mouth slightly 

 oblique, with the maxillary extending to or 

 a little beyond the vertical from the posterior 

 edge of the eye, and the teeth moderately strong. 

 The diameter of the eye measures about one-sixth, 

 the width of the convex interorbital region one-third, 

 or a little less than one-third, of the length of the 

 head. The dorsal fin is moderately elevated, the 

 longest ray measuring one-half to two-thirds the 

 length of the head, and the pectoral fin, when 

 laid back, extends from one-half to three-fourths 

 of the distance from its base to the insertion 

 of the pelvic fins. The females have a somewhat 

 smaller head, blunter snout, shorter paired fins, and 

 duller coloration than the males, whilst young speci- 

 mens are distinguished from the adult fish just 

 described by their blunter snout, smaller mouth, 



