GASTEROPODA. 305 



specimens of the ordinary colour, but with the addition of spiral narrow- 

 white bands — in some waters the different species of Limnei, &c., are so 

 marked. A shell differing from the L. palustris in general proportion 

 (being much shorter relatively to its breadth) and in colour (generally of 

 a uniform pale yellow) is common to Lough Neagh and other lakes in 

 Ireland : it is found attached to stones at the edge of the water, and 

 where the adjacent bottom is stony, with very little vegetation — under 

 similar circumstances it has also occurred to me in the first-named local- 

 ity. It is identical with the var. (i of Mr. Jeffreys, who has favoured me 

 with specimens from Battersea, near London. The small size, different 

 colour, and freedom from all adventitious matter, I should be disposed to 

 attribute to the colder water and less food, in such localities, than in the 

 ponds and ditches, in which the ordinary form prevails. 



L. tnmcatulus, JeSi'eys, 



Is generally distributed over Ireland. It inhabits drains, ditches, &c., 

 like the L. joa/ustris ; but in moist spots, and about springs, at a consi- 

 derable elevation in the northern mountains,* is likewise found, and is 

 here always of a very small size. In July, 1833, when accompanied 

 by Mr. Hyndman, I remarked many of this species alive, and adhering to 

 stones which lay dry upon the shore of Lough Neagh, far above the sum- 

 mer level of its waters,! these were of uniform size, very small, and when 

 containing the living animal of a very dark reddish-brown colour. 

 Many varieties of the L. tnmcatulus have occurred to me in Ireland ; 

 among them was one very much elongated, and another with regular 

 longitudinal striae, the latter of which is well remarked by Dr. Turton 

 to be " very elegant." — 3Ian. p. 125. 



L. glaber, Gray. 



I have not seen any Irish specimens of this Limneus, which is thus no- 

 ticed in the supplement to Mr. Jeffreys's paper in the Linnaean Transac- 

 tions, vol. xvi. p. 520 : " Ireland, Rev. James Bulwer." On inquiry of 

 Mr. Bulwer, he stated that the shell so noticed was considered by him 

 but a variety of L. palustris. By a letter from Mr. Jeffreys, dated June 

 S, 1840, 1 learn that " L. elongatus was mentioned as Irish on the author- 

 ity of the late Dr. Goodall, Avho stated that he had received specimens 

 from Mr. Bulwer." Mr. Jeffreys adds, " I have, however, two or three 

 undoubted specimens among a collection of Irish shells, which I pur- 

 chased about three months ago from Mr. John Humphreys of Cork — the 

 tray which contained them was labelled ' Cork.' " From Mr. Humphreys 

 I learn that he had not identified the species, but that the note of locality 

 appended to the shells alluded to by Mr. Jeffreys, was stxictly correct. 



Genus Anctlus. 

 A.Jluviatilis, Mull. 



This species is distributed over the island, and is equally found attached 

 to stones in the mountain torrent, the river, and the still waters of the 

 lake. The var. described by Montagu (p. 483) as being strongly striated, 



* In such places it is preyed on by the lapwing [Venelhis cristafus), from 

 whose stomach I have taken it. 



f Montagu has, on the contrary, remarked that when left dry the animiil 

 perishes. — Test. Brit., p. 372. 



