FISHES. 541 



dotted with small black spots. Br. 10; D. 21; P. 15; 

 V. 10; A. 13; C. 19. 



Gen. Coregonus, Art. The Gwynniad. 



General appearance that of a large herring, with an 

 adipose fin ; teeth either altogether absent, or very small ; 

 the whole head and gill covers totally devoid of scales ; first 

 dorsal short ; more high than long. 



Most of this genus are partial migrants to the sea, but 

 all spawn in fresh water. 



This is another class respecting the identity of the mem- 

 bers of which the greatest confusion has hitherto existed. 

 It is impossible, from the variety and misapplication of the 

 synonymes used by different authors when describing the 

 different species, to say which the synonyme properly belongs 

 to, and although of late many of our naturalists have 

 turned their attention to this genus, much still remains to 

 be done before we can even say how many different species 

 of gwynniad we have in Sweden. I shall refer to the 

 various authors who have devoted much time to the study 

 of this fish, and by comparing their remarks we will see if 

 we can throw any light upon this vexata quaestio. 



Beginning with Mr. Lloyd, who has had good opportuni- 

 ties of studying the gwynniads in the south of the Wener, 

 and who wrote on this subject in 1854. He first remarks 

 that English naturalists assured him that not one of the 

 Swedish specimens brought over by him was identical with 

 those found in Great Britain. 



In his "Scandinavian Adventures" he gives us descriptions 

 and excellent figures of three different gwynniads which 

 were all common in the Wener, and which he seems to 

 consider as good and distinct species, and these are certainly 

 the commonest and best identified of the Scandinavian 

 gwynniads. 



1. Coregonus oxyrliynchus, L. ISTabb sik, Sw. Thymallus 

 Latus, Bl. 



The distinguishing characteristics of this fish, he says, 

 are the remarkable elongations of the upper jaw, the 



