Freshwater Mollusca of Ireland. 195 
gland likewise, the additional habitat of Stow Pool, Lichfield, may 
be given, where I procured it in July, 1836. 
Gen. 2. Prsip1um, Pfeiffer. 
1. P. obtusale+, Pfeiffer? Jenyns, Monog. p. 13. pl. 20. f. 1—3; 
Gray, Man. p. 282. pl. 12. f. 149. 
This, with the exception of P. Henslowianum, would seem to be 
the rarest of the Pisidia in Ireland. In two localities in the county 
of Down it has occurred to me—in a drain cut through clay soil in 
a brickfield near Bangor, and in a pond at Portavo, the seat of D. 
Ker, Esq. M.P. A single specimen has been taken at Finnoe (county 
Tipperary) by Edw. Waller, Esq. 
2. Pisidium nitidum, Jenyns, Monog. p. 16. pl. 20. f. 7, 8; Gray, 
Man. p. 283. pl. 12. f. 150. 
Is somewhat generally distributed in Ireland. It is abundant in 
a cold turfy deposit conveyed by a mountain stream to a pond at 
Wolfhill{ near Belfast; and on the Utricularia vulgaris growing in 
stagnant pools, excavated in brick-making close to the town—these 
places are of a very different nature, the pond at the former being 
supplied with clear spring water, and at an elevation of nearly 600 
feet above the sea, the latter but a few feet above it, and supplied 
only with rain water. In the west, I have obtained this species in 
Lough Gill, county Sligo. From about Portarlington it has been 
sent me by the Rev. B. J. Clarke, and from Finnoe by Edw. Wal- 
ler, Esq. 
3. Pisidium pusillum, Jenyns, Monog. p. 14. pl. 20. f. 4—6; Gray, 
Man. p. 288. pl. 1. f. 7. 
Is the most common of the genus in Ireland, and universally dis- 
tributed. It is generally to be met with in ponds, drains, &c.; but 
in marshy spots, both in this country and in Scotland, I have found 
it in company with, and adhering to, the same stones as land Mol- 
lusca which inhabit such places, as Vertigo palustris, &c. In the 
north and south of Ireland I have procured it among moss, which 
was kept moist only by the spray of the waterfall. 
4. Pisidium pulchellum, Jenyns, Monog. p. 18. pl. 21. f. 1—5§; Gray, 
Man. p. 284. pl. 12. f. 151. 
This handsome and well-marked species is generally distributed 
over the island. It inhabits stagnant and running water of the least 
as well as greatest extent, and at the same time and place may be 
found on various subaquatic plants, and buried in the mud—the 
largest and finest specimens I have procured were from the gently 
flowing river Main, near its junction with Lough Neagh. 
+ All the Pisidia about to be noticed, have been determined from compa- 
— with English specimens favoured me by the Rev. L. Jenyns and Mr. 
Alder. 
t A minute leech preys much on the P. nitidum and P. pusillum, which. 
are found here in company. 
§ All the varieties are found in Ireland—of var. 3, a single specimen 
has been obtained by the Rev. B. J. Clarke near Portarlington. Mr. Jenyns 
is now inclined to consider this a distinct species. See Gray, Man. p. 285. 
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