124 BRITISH FRESHWATER FISHES 



This form is distinguished by small blackish spots 

 on the back and sides, which are in some specimens 

 few and indistinct, in others very numerous, and 

 present also on the head and in transverse series on 

 the dorsal and caudal fins. The body is usually 

 deeper and the interorbital region broader than in 

 the Powan ; the branched rays in the anal fin 

 number ten to twelve (nine to eleven in the Powan) 

 and the scales round the caudal peduncle twenty- 

 two to twenty-four (twenty to twenty-two in the 

 Powan). 



Accounts of the habits and food of this fish are 

 very similar to those which have been given for the 

 Powan. It is scarce in Ullswater, but still abundant 

 in Haweswater, where it is netted ; it reaches a 

 length of 1 5 inches. 



THE GWYNIAD (Coregonus pennantit), of Bala 

 Lake in Merionethshire, takes its name from the 

 Gaelic gwyn, white ; it has a somewhat larger eye 

 than either the Powan or the Schelly ; it further 

 differs from them in that there are usually nine or 

 ten (rarely eight) longitudinal series of scales on 

 each side between the lateral line and the base of 

 the pelvic fin, whereas the Powan and Schelly have 

 seven to nine, the latter number being rare. The 

 anal fin has eleven to thirteen branched rays. 

 The Gwyniad attains a length of 1 6 inches ; its 

 habits appear to resemble those of the Powan. 



The Powan, Schelly, and Gwyniad are represented 

 by several very similar forms in the lakes of 

 Scandinavia and Central Europe^ including the 

 " Blaufelchen " (C. wartmannt) of the Lake of 

 Constance. A migratory arctic species (C. muksuri], 



