1863.] DR. A. GiJNTHER ON THE BRITISH CHARRS. 13 



size of 5 inches. Owing to the kind assistance of the Earl of Enni- 

 skillen and of Th. Brooke, Esq., I have been able not only to ascer- 

 tain the exact locality where those specimens are found, but also to 

 determine the characters of this new species (for such has the 

 Charr of Lough Eske proved to be) ; and I name it after that noble- 

 man, who has taken untiring interest in these researches. 



Salmo coin is not confined to Lough Eske ; a specimen procured 

 by R. H. Scott, Esq., from Lough Dan, agrees in every respect with 

 the Charr of Lough Eske. The following description, given strictly 

 iu accordance with that of Salmo graijii, will show the distinctive 

 characters on which this species is founded : — 



Body slightly compressed and rather elongate, its greatest depth 

 being contained four times and three-fifths or five times in the distance 

 of the snout from the end of the middle caudal rays. The length of 

 the head is one-half of the distance between the snout and the vertical 

 from the origin of the dorsal fin. Head compressed ; interorbital 

 space nearly flat, its width being less than twice the diameter of the 

 eye. Jaws of the male of equal length anteriorly ; teeth very small, 

 four to six in each intermaxillary, fourteen to seventeen in each 

 maxillary. Pectoral shorter than the head, terminating at a consi- 

 derable distance from the origin of the dorsal and of the ventral. 

 Dorsal rays fourteen. 160 transverse series of scales above the 

 lateral line. 



Description of a male and female specimen, 7| inches long. — Head 

 and body slightly compressed, not elevated, the greatest depth being 

 below the origin of the dorsal fin, where it is contained four times 

 and three-fifths (female) or five times (male) in the total length (to 

 the end of the middle caudal rays) . The least depth of the tail is 

 considerably less than the length of the base of the dorsal fin. The 

 height of the head above the mandibulary joint is more than the 

 distance between the posterior margin of the orbit and the end of 

 the operculum. The top of the profile of the head is scarcely elevated 

 above the margin of the orbit, the diameter of which is one-fifth of 

 the length of the head, somewhat shorter than the snout, and two- 

 thirds of the width of the interorbital space ; the latter is but very 

 slightly convex, with a very indistinct ridge along the middle. The 

 nostrils are situated midway between the end of the snout and the 

 orbit. The maxillary extends scarcely to the vertical from the poste- 

 rior margin of the orbit, and is armed with from thirteen to seven- 

 teen very small teeth. All the other teeth are small ; four to six in 

 the intermaxillary, fifteen in each mandible, three on the vomer, 

 fifteen on each palatine, and four pairs on the tongue. The sub- 

 operculum forms the hindmost part of the gill-covers, and does not 

 cover the exposed portion of the humerus above the root of the pec- 

 toral ; its vertical width is one-half of that of the operculum. 



D. 14. A. 12. P. 13. V. 9. 



The origin of the dorsal fin is a little nearer to the end of the 

 snout than to the root of the caudal ; the length of its base is con- 

 siderably more than that of the last ray, and contained once and a 



