THE SALMON FAMILY. 361 



marked with about 15 dusky longitudinal bands or bars j the general 

 hue becomes darker with age, and about the spawning-season the pec- 

 toral fins are reddish with small black spots : for further remarks on 

 colouring see p. 357. Vertebrae 58. 



Fin-rays : D. 20 : P. 15 : V. 10 : A. 13 : C. 20. 



Genus COREQONUS. 



THE GWYNIAD. 



(Coregonus Pennanti*.) 



All the species of this genus (the last of the Salmonidae) 

 are more or less like the Herring in their general appear- 

 ance, from which, however, they are broadly distinguished 

 by the characteristic of two back-fins the first being 

 greater in height than in length, and commencing before 

 the ventrals, the second adipose or fleshy ; the scales large ; 

 teeth small, or wholly absent ; pre-maxillary bones lying 

 across the front of the mouth, which is small ; maxillary 

 bones on sides of mouth, generally oval. 



* Coregonus, Gr. name for the species ; Pennanti, of Pennant, Lat. 



R 



