1863.] DR. A. GUNTHER ON THE BRITISH CHARRS. ^ 



great value for the distinction of the species of fishes as in the higher 

 classes of vertebrate animals. I have been induced to make these 

 remarks by the fact (to which we shall recur in the progress of this 

 paper) that the Salmo alpinus of Scotland attains maturity at a size 

 inferior to that of an immature Swedish Salmo alpinus. Now, if such 

 a difference in the size should be considered as a specific character at 

 a future time, the Scotch and Swedish fishes would be separated. 



The specimens which I have examined since the publication of the 

 first paper are the following ; they have been deposited in the Col- 

 lection of the British Museum : — 



a. Salmo salvelinus, Nilss. 



A large male specimen from the Lake of Wettern ; presented by- 

 Professor Liljeborg. 



b. Salmo alpinus, L. 



A young male from Lapland ; presented by Prof Liljeborg. 



Four adult males from Quickjock (Lapland) ; sent by Mr. Wheel- 

 wright. 



Two immature specimens from Lake Helier in Hoy, Orkneys ; pre- 

 sented by Dr. W. Traill. 



Five adult specimens, males and females, from Scotland ; pur- 

 chased of Mr. Stevens. 



c. Salmo willughbii. 



Many mature male and female specimens from Loch Bruiach ; 

 presented by Lord Lovat. 



d. Salmo nivalis. 



Two very fine immature specimens ; presented by G. G. Fowler, 

 Esq. 



e. Salmo grayi. 



Many adult males from Lough Melvin ; presented by the Earl of 

 Enniskillen. 



An adult female ; purchased of Mr. Stevens. 



f. Salmo coin, n. sp. 



Many specimens from Lough Eske ; presented by the Earl of En- 

 niskillen and by T. Brooke, Esq. 



A female specimen from Lough Dan, co. Wicklow ; presented by 

 R. H. Scott, Esq. 



Before proceeding to the detailed remarks on these six species, I 

 must express my best thanks to the gentlemen mentioned for their 

 assistance, which was accompanied by much valuable information. 



a. Salmo salvelimis (L.), Nilss. 



Diagnosis, taken from a male specimen from the Lake of Wettern, 

 1 7 inches long. — Body slightly compressed and elongate, its greatest 

 depth being contained five times and a half in the total length (to 



