Irish Fishes of (he Genus Coregonus. 487 



Of these sixteen examples thirteen have 9 scales between 

 the lateral line and the base of the pelvic fin. 



Although not so abundant as the Pollan in Lough Neagh, 

 this form is fairly plentiful, and I am informed by Major 

 Trevelyan that it has been netted fur the market for some 

 years, fetching 10c?. per lb. in England and Sd. per lb. in 

 Belfast. F 



Subsp. b. Coregonus elegans. 

 The Shannon Pollan. 



Coregonus clupeoides (non Lacep.), Thompson, Ann. & Mao-. Nat Hist 



ii. 1839, pp. 266 & 421, pi. xvi. fig. 4. 

 Coregonus elegans, Thompson, t. c. p. 422. 



Depth of body 3f to 4£ in the length, length of head A\ 

 to 5. Snont as long as or longer than eye, the diameter of 

 which is 4^ to 6 in the length of head ; interorbital width 3 

 to 3^ in the length of head. Jaws equal anteriorly; maxil- 

 lary extending to below anterior \ of eye, its length \ to 2 

 the length of head. 24 to 28 gill-rakers on the lower part of 

 the anterior arch. 78 to 92 scales in a longitudinal series 

 9 to 11 in a transverse series from origin of dorsal fin to 

 lateral line, 8 to 10 between lateral line and base of pelvic 

 fin, 22 to 26 round the caudal peduncle. Dorsal with 10 or 

 11 branched rays, its origin nearer to end of snout than to 

 base of caudal fin ; longest ray about § the length of head. 

 Anal with 8 to 10 branched rays. Pectoral extending \ or 

 a little less than \ of the distance from its base to that of the 

 pelvics, which are inserted below the middle of the dorsal. 

 Caudal peduncle 1^ to If as long as deep, its least depth 

 from a little more than \ to a little less than \ the length of 

 head. Coloration as in C. pollan. 



Lakes of the Shannon System, Ireland. 



Eleven specimens from Loughs Ree and Derg, 210 to 

 360 mm. in total length — one a dried skin, the only one of 

 Thompson's examples of this form which has been preserved, 

 lent by the Belfast Museum ; one received on loan from the 

 Dublin Museum; the others recently acquired from Mr. Frank 

 Browne (five), Mr. E. W. L. Holt (presented two), and 

 Harrod's Ltd. (presented two). 



Of the eleven examples, seven have 10 scales between the 

 lateral line and the base of the pelvic fin, three have 9, and 

 one 8. 



. This fish is now scarce, but Mr. E. W. L. Holt writes me 

 that it was plentiful in Lough Ree previous to the drainage 

 of the Shannon in 1845-6. 



35* 



