SALMONIM). 129 



Hist. (2), xv, 1855, p. 57), found the stomach of some he examined distended 

 with thousands of Entomostraca. Jardino observed the same food in those he 

 dissected. 



Means of capture. — Netting. 



Breeding. — Generally, but not invariably, about the middle of November. 

 Knox examined 22 females captured the middle of December, in 19 the ovaries 

 were small, very soft, and the ova mere points, while the fish were in good con- 

 dition : in the other three the ova were large and the parents about to spawn : 

 in two males the milts were progressing in size, but not much enlarged. 



As food. — It is much esteemed locally, being considered a great delicacy for 

 the table, enhanced possibly by the difficulty in procuring it. 



Habitat. — In two of the system of lakes near Lochmaben, Dumfriesshire, 

 namely, the Castle Loch, so termed from the ruined castle of Brus, on its banks : 

 and the Mill Loch ; the latter being deeper but less extensive. Also Derwent- 

 water and Bassenthwaite Lakes (Davy). 



It attains to about 9 inches in length. 



4. Coregonus pollan, Plate CXXIII, fig. 2. 



Coregonus pollan, Thompson, Proc. Zool. Soc. 1835, p. 77, and Mag. Zool. and 

 Bot. i, p. 247, and Nat. Hist. Ireland, iv, p. 168 ; Jenyns, Manual, p. 432 ; Yarrell, 

 Brit. Fishes (ed. 1) ii, p. 88, c. fig. (ed. 2) ii, p. 156 (ed. 3) i, p. 319 ; Cuv. and 

 Val. xxi, p. 502 ; White, Catal. p. 81 ; Giinther, Catal. vi, p. 194 ; Houghton, 

 Brit. F. W. Fish. p. 157, c. fig. 



Coregonus clupeoides, Thompson, Ann. and Mag. Nat. Hist, ii, and I.e. iv, p. 170. 



Pollan, Couch, Fish. Brit. Isles, iv, p. 292, pi. cexxxi. 



B. ix, D. 13-14 ( TT 2 Ty ) | P. 15-16, V. 11-12, A. 12-14 ( t Vtt) 0. 23, L. 1. 

 80-88, L. tr. 9-10/11-12, Vert. 59-61. 



Length of head 5 to 5i, of caudal fin 5j, height of body 5J to 5^ in the total 

 length. Eyes — diameter 4 to 4|- in length of the head, 1 to If diameters from the 

 end of the snout, and also apart. The two jaws of the same length anteriorly. 

 Thompson observes that he has seen individuals with the upper rather exceeding 

 the lower jaw, others with the lower slightly projecting beyond the upper, and 

 the difference was not sexual. The posterior extremity of the maxilla reaches to 

 beneath the first third of the eye. Teeth — if present very minute. Fins — the 

 first dorsal commences midway between the end of the snout and the hind edge 

 of the base of the anal fin, it is five-sixths the height of the body beneath it : 

 ventral inserted below the middle of the first dorsal fin, and midway between the 

 hind edge of the head and the middle of the base of the anal fin. Ccecal 

 appendages numerous. Scales — nine rows between the lateral-line and the inser- 

 tion of the ventral fin. Colours — superiorly bluish along its upper third, silvery 

 on the sides and beneath. Dorsal, caudal, and anal fins darkest externally. 



Varieties. — The pollan of Lough Eime, was observed by Yarrell to be com- 

 paratively rather deeper than those from Lough Neagh. Mr. Ffennell produced 

 specimens of the pollan taken in November, 1881, in Lough Neagh, and some 

 from Killarncy, taken May 8th, and pointed out the difference in the shape of the 

 head and gill-covers in the sjiecimens from the two localities (Dublin Nat. Hist. 

 Soc. April, 1852). 



Names. — Pollan, from a local Irish term. Thompson obtained two examples, 

 4^ and 4;} in. long, from the Shannon at Killaloe where it was termed a Gunn, 

 this form being reputed to descend the river with the eels during the winter and 

 to refuse all bait. He first proposed to term it Coregonus elegans. 



Habits. — This fish approaches the shore in large shoals, not oidy during spring 

 and summer but late into the autumn. It dies soon after being removed from the 

 water. In Lough Neagh, where it is a permanent resident, it is not generally 

 diffused but approaches the shores at some particular spot, to which it returns 

 again and again. 



A correspondent of the Field (Jan. 29th, 1881) observes respecting this fish in 



9 



