350 
MOLLUSCA. 
he has also procured some at Youghal ; in Mr. Hyndman’s cabinet, is a 
specimen from another locality in the South. By Mr. T. W. Warren of 
Dublin this Cyclas has been obtained in a pond in the Phoenix Park, 
and in the Grand Canal near that city. And by Dr. Coulter in Lord 
Roden’s demesne, Dundalk. Dr. Hincks has lately procured it near 
Cork. 
Genus Pisidium. 
P. obtusale, Pfeiffer ? 
This, with the exception of P. Hensloivianum, 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. 
Pisidium nitidum, Jenyns, 
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, ex- 
cavated 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. Waller, Esq. 
Pisidium pusittum, Jenyns, 
Is the most common of the genus in Ireland, and universally distributed. 
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 Mollusca, 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. 
Pisidium pulchellum, Jenyns. 
This handsome and well-marked species is generally distributed over 
the island. It inhabits stagnant and running water of the least, as well 
as the 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. 
Pisidium Henslowianum, Jenyns. 
The addition of this species to our Fauna is due to Edw. Waller, Esq., 
Avho has favoured me with the inspection of a few specimens which he 
procured at Finnoe, County Tipperary. 
Pisidium am?ncum, Jenyns, 
Although not very common, is widely distributed over the island, and is 
known to me as occurring in every portion except the extreme South. 
