332 Bibliographical Notices. 



figure Lrivcn as the supposed " Parr or young Trout" has been un- 

 doubtedly designed from a young specimen of true S.fario. We may 

 also remark that all the examples figured are from specimens agree- 

 ing with a very marked but not uncommon variety of the Scottish 

 S.fario found in the smaller alpine streams. On tab. Ill b. are 

 given representations of the head of a deformed Trout, similar to 

 that represented by Mr. Varrell, and which we know to occur in se- 

 veral lochs in Wales and in Scotland, and to be not uncommon in the 

 localities where it is found. The malformation is extremely uni- 

 form or similar in all the specimens or representations of it which 

 we have seen, but the cause has not yet been noticed, nor has it been 

 attempted to be accounted for. Is the race continued by breeding? 



Seven plates illustrate two species of migratory Trout which are 

 given under the names of £. trutta and lacustris, Linn.*. In these 

 we think we recognise the two British fishes which have been con- 

 founded under the provincial name of " Sea Trout." They are very 

 distinct in some of their states, and the form of the tail distinguishes 

 them, together with the colours during the breeding season, but w r e 

 should have preferred to have seen figures of these species when in 

 high condition ; residence in a lake may in various ways influence 

 the form. The young of these fish constitutes the S. albus of Fleming. 

 Should the S. trutta of this work not stand as S. criox of Willughb. ? 



The Char are all placed under S. umbla, Linn., and the "Welsh 

 Char" is given as an English synonym. Although we know r the Char 

 to vary very considerably, we are inclined to refer the British fish to 

 two species, chiefly distinguished by the great difference in the scaling. 

 Those figured by M. Agassiz seem all referable to the "Northern 

 Char" of modern British writers. 



S. hucho of the Danube, unknown in the British waters, is repre- 

 sented in the young and adult states, and the last plates delineate the 

 Thymallus vejcillifer, Agass., or Common Grayling, found only by 

 the British ichthyologist in certain districts in England. 



In looking at the list of the Salmon of Britain and Central Europe 

 comparatively, w r e are prepared for a close resemblance of species ; 

 but from the work before us we perceive one species, S. hucho of 

 the Danube, which does not occur in Britain or Ireland, while we 

 find omitted the Bull Trout of the river Tweed, (the S. eriox of some 

 authors, but not of Willughby,) and the great Trout of the Scotch, 

 Irish, and North of England lakes. These we have no doubt in being 

 distinct species, and it appears to us remarkable that the latter should 



* We are presuming that the S. lacustris here given is a migratory 

 species, and if so we think the name objectionable. 



