Dr. A. Giinther on the British Charrs. 235 



Diagnosis. — Body slightly compressed and elongate ; its greatest 

 depth equals the length of the head, and is one-fifth, or somewhat 

 less than one-fifth, of the total length ; the length of the head is 

 rather more than one-half of the distance between the snout and the 

 vertical from the origin of the dorsal fin. The maxillary extends 

 beyond the orbit in the adult fish (15-20 inches long). The eye is 

 less than one-half of the interorbital space in the adult fish. The 

 length of the pectoral fin is, in mature and immature specimens, more, 

 or much more, than one-half of the distance of its base from the root 

 of the ventral. Dorsal rays fourteen ; the length of the longest ray 

 equals that of the pectoral, or that of the head without the snout ; 

 the length of the last ray is two-thirds of the length of the base. 

 190 transverse series of scales above the lateral line. Vertebrae 62. 

 Teeth of moderate size. 



Pyloric appendages 4 1 . Specimens from 10-12 inches long are 

 still immature. The stomach of one contained numerous very small 

 freshwater bivalves. 



e. Salmo Gi^ayii. 



The Earl of Enniskillen has sent several very fine specimens of 

 this species from Lough Melvin for the collection of the British 

 Museum ; they were all males, and perfectly like, even in size, those 

 from which I have taken my description. A few of them showed 

 the red of the belly of a deeper hue than the individual figured. A 

 female fish, however, has been discovered among a collection of Sal- 

 monidce purchased of Mr. Stevens : this specimen does not differ 

 from the males ; but the colours have disappeared, the specimen 

 being preserved in spirits. The eggs are of the size of a hemp-seed. 



The number of pyloric appendages is thirty-seven ; and that of 

 the gill-rakers of the lower branch of the outer branchial arch varies 

 from nine to thirteen. 



f. Salmo Colli, n. sp. The Charr of Lough Eske. 



In the former paper on Charrs, I mentioned several Irish speci- 

 mens, the property of the Museum at Belfast, said to be perhaps 

 from Lough Melvin. I then doubted the accuracy of the " habitat," 

 as those specimens, although allied to the Charr of Lough Melvin, 

 differed in several not unimportant points from the types, and as 

 they evidently belong to a very small species which is mature at a 

 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 

 in accordance with that of Salmo Grayii, will show the distinctive 

 characters on which this species is founded : — 



16* 



