POLLAN. 159 



men of the bivalve shell Pisidium pulchellum. A pebble of 

 equal size was also found with it." In the stomach of a 

 specimen given me by Mr. Thompson I found a species of 

 Gammarus. Mr. Thompson, in some more recent examina- 

 tions, lias found mature individuals of Gammarus aqualicus, 

 and the larvte of various aquatic insects ; some shells of the 

 genus Pisidium., one of the fry of the three-spined stickleback, 

 and a few fragments of stone. Others were found to contain 

 minute Entomostraca^ two Pisidia, and a Limneus pereger ; 

 this last was three lines in length. 



Besides inhabiting Lough Neagh, the Pollan has also 

 been found in Lough Derg, an expansion of the Shan- 

 non ; and Lord Cole, who has most condescendingly in- 

 terested himself in the History of British Fishes, had the 

 kindness to send me a jar full of Pollan from Lough Erne in 

 the county of Fermanagh, from one of which specimens our 

 figure was taken. The Pollan of Lough Erne are rather 

 deeper for their length than those of Lough Neagh. His 

 lordship has also sent me numerous Charr from Ireland ; 

 some from Lough Eask very much like the Charr of the 

 Cumberland Lakes, while those from Lough Melvyn are 

 short and deep fish with large fins exactly resembling the 

 Charr found in two or three lakes in Wales, the particulars 

 of which have been already described. 



To return to the Pollan of Ireland, Mr. Thompson's de- 

 scription is as follows : " The relative length of the head to 

 that of the body is about as one to three and a half; the 

 depth of the body equal to the length of the head ; the jaws 

 equal in length, both occasionally furnished with a few delicate 

 teeth ; the tongue with many teeth ; the lateral line sloping 

 downwards for a short way from the operculum, and thence 

 passing straight to the tail. Nine rows of scales from the 

 dorsal fin to the lateral line, and the same number thence to 

 the ventral fin, the row of scales on the back and that of the 



