1863.] DR. A. GTJNTHER ON THE BRITISH CHARRS. 15 



I am acquainted, that of Lough Neagh *, the flesh of which is quite 

 white ; aud the shape of the fish was like Sea-Herring." 



Conclusion. 



When we recapitulate the results of our examinations contained in 

 this and in the preceding papers, we hope we have shown — 



1. That three very distinct species of Charrs are found in Great 

 Britain, namely, S. willughbii in the Lake of Windermere and in 

 Loch Bruiach, 5. cambricus in Wales, and S. alpinus in certain parts 

 of Scotland. 



2. That those three species diifer by most constant characters from 

 the S. umhla and S. salvelinus of the Continent ; but that S. alpinus 

 of Scotland is closely related to the S. alpinus of Lapland, differino- 

 merely by its smaller size when first attaining to maturity, and by 

 the number of vertebrae. 



3. That Iceland is inhabited by a distinct species {S. nivalis). 



4. That the Charrs of Ireland form a separate group by them- 

 selves, distinguished by the feeble development of their dentition ; 

 and that the Charr of Lough Melvin (S. grayi) is a distinct species 

 from that of Lough Eske and Lough Dan {S. colii). 



In conclusion, I subjoin a synopsis of the species which I have 

 examined up to the present time, observing, however, that this sy- 

 nopsis is given merely for the purpose of showing afeiv of the prin- 

 cipal characters by which tte mature individuals of the different 

 species are distinguished : — 



I. Jaws to ell developed; teeth, of moderate size. 



A. The length of the pectoral fin in the mature fish less than 



one-half of the distance between the roots of the pectoral 

 and ventral fins. 



1. Thirteen dorsal rays. Intermaxillary teeth much 

 stronger than those of the maxillary. L. lat. 185. 

 Lower parts silvery. S. umhla. 



2. Fourteen dorsal rays ; intermaxillary and maxillary 

 teeth equal in strength. L. lat. 190. Lower 

 parts red. S. salvelinus. 



B. The length of the pectoral fin in the mature fish more than, 

 or equal to, one-half of the distance between the roots 

 of the pectoral and ventral fins. 



1. The height of the body one-fifth or one-sixth of the 

 total length ; the height of the dorsal fin three- 

 fifths or one-half of the length of the head. L. 

 lat. 195-200. S. alpinus. 



2. The height of the body one-fifth of the total length ; 

 the height of the dorsal fin equals the length of 

 the head without snout. L. lat. 190. The gill- 

 cover not overlapping the root of the pectoral. 

 S. nivalis. 



* Mr. Brooke evidently alludes here to the Coregmus pollan. 



