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. (3 of Mr. J effreys, 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. truncatulus , J effreys, 
Is generally distributed over Ireland. It inhabits drains, ditches, &c., 
like the L. palustris ; 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, f 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. truncatulus 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.” — Man. 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 
8, 1840, 1 learn that “ L. elongatus was mentioned as Irish on the author- 
ity of the late Dr. Goodall, who 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 strictly correct. 
Genus Ancylus. 
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 ( Venellus cristatus), from 
whose stomach I have taken it. 
f Montagu has, on the contrary, remarked that when left dry the animal 
perishes. — Test. Brit., p. 372. 
