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 

 ]3ub]in this Cifclas has been obtained in a pond in the Phoenix Park, 

 and in the Grand Canal near that city. And by Dr. Coulter in Lord 

 Koden's demesne, Dundalk. Dr. Hincks has lately procured it near 

 Cork. 



Genus PisiDlUM. 



P. ohtusaJe, PfeifTer ? 



This, Avith the exception of P. JIensloivianu7n,'wou\d 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 nitiduin, 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 Utricnlaria vulr/aris growing in stagnant pools, ex- 

 cavated in brick-making, close to the town. These places are of a very 

 diflerent nature, the pond at the former being sujiplied 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 jmsillum, Jenyns, 

 Is the most common of the genus in Ireland, and imiversally 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 pahistris, &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 pulchelliwi, Jenyns. 

 This handsome and Avell-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 gentlj'-flowing river Main, near 

 its junction with Lough Neagh. 



Pisiditmi Henslowicmum, Jenyns. 



The addition of this species to our Fauna is due to Edw. Waller, Esq., 

 who has favoured me with the inspection of a few specimens which he 

 procured at Finnoe, County Tipperary. 



Pisiditim amnicum, 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. 



