192 On the Occurrence of the Bonapartian Gull in Europe. 



Eolis exigua. 



Body slender, yellowish white with olive or pale brown mark- 

 ings. Dorsal tentacles linear, moderately long, with a ring of 

 brown near the top : oral tentacles about one-third shorter and 

 of the same colour. Branchiae generally in a single series of five 

 or six on each side, but in fine full-grown specimens there are 

 two on each side in front or sometimes a cluster of three, the 

 third being placed a little behind the others. There is also fre- 

 quently an additional papilla united with some of the others be- 

 hind. They are ovate, tapering abruptly to a point : there is a 

 ring of olive or yellowish brown, sometimes reddish, at a short 

 distance from the apex, and frequently two others, less perfect 

 below, but generally these are only indicated by brown spots or 

 streaks. The body is also blotched and spotted with brown, and 

 there is frequently an interrupted line of that colour on each side. 

 Foot rounded in front and nearly linear, with a slight margin of 

 pale brown at the sides. Length 1| to 2 lines. 



This species was found in considerable abundance in Fowey 

 Harbour on Laminaria saccharina. Mr. Cocks has also found it 

 at Falmouth. It is allied to Eolis despecta, some specimens of 

 which were found in company with it, but it is easily distin- 

 guished by not having the waved dorsal line of the latter species. 

 It appears to be the Tergipes lacinulatus of Professor Loven, but 

 we cannot concur in referring it to the Limax tergipes of Forskahl 

 {Doris lacinulatus, Gmelin). 



XXI. — Note on the Occurrence of the Bonapartian Gull (Larus 

 Bonapartii, Rich, and Swains.) for the first time in Europe. 

 By Wm. Thompson, Esq., Pres. Nat. Hist, and Phil. Society 

 of Belfast. 



A specimen of this beautiful little species of Gull (first distinctly 

 characterized in the ' Fauna Boreali Americana ' of Richardson 

 and Swainson in 1831), was killed at the tidal portion of the river 

 Lagan, between Ormeau Bridge and the Botanic Garden, about 

 a mile above the lowest bridge at the town of Belfast, on the 

 1st of February 1848. It was flying singly. The person who 

 shot the bird, attracted by its pretty appearance merely, left it 

 to be preserved with a taxidermist, who on receipt of any birds, 

 either rare or unknown to him, kindly brings them for my in- 

 spection. I had thus most fortunately an opportunity of exa- 

 mining the bird previous to its being skinned, when all the fol- 

 lowing measurements, &c. were made. This was not however 

 until the morning of the 5th of February, when the irides had 

 faded so that the colour could not be accurately noted. 



