Stelfox — List of Land and Freshwater Mollusks of Ireland. 109 



some of the maritime lakes of the west 

 coast. The prevailing form in the west 



WD E^D LD AN 

 FE TY AR DO 



WMSL LE MO 



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wc 



is the var. acuta of Jeffreys (tigs. 15, 

 16, 17). Even that found in the eastern 

 and southern counties inclines towards 

 this same variety, though Cork examples 

 are fairly typical (figs. 18, 19, 20). 



In the lakes of Mullaghderg and 

 Carnboy in West Donegal the majority 

 of the shells are pure white, while the 

 animals are often of a rich yellowish- 

 orange colour in the latter locality. 

 Both these lakes are almost at sea-level, 

 and no doubt receive a certain amount 

 of spray during rough weather. With 

 the exception of Achill Island in West 

 Mayo, we have no records of this species 

 being found on any of the western 

 islands, owing probably in most cases to 

 the want of a suitable habitat. 



Limnaea pereger (Miiller). 

 Plate VII, figs. 1-6, 10-14. 



Helix putris and H. Uwosa, Brown, 

 Mem. Werner. Soc, vol. ii, p. 530, 

 1818. Limneus pereger, Thompson, 

 Cat. L. & F. W. Moll, of Ireland, 

 p. 30, 1840. ZM«rt««a^;«r«yr«, Scharif, 

 Irish Nat., p. 150, 1892. 



The typical Limnaea pereger of the 



Continent is not found in Ireland ; but 

 in the eastern counties specimens some- 



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 FE TY AR DO 

 WMSL LE MO 



EM RO GV LH 

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 SG KG KD DU 

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 SK MG EG WA 

 WG 



what approaching the type occur. 

 Many different forms are to be met with 

 in this country, of which the following 

 are the most noteworthy : — 



(«) Nax. ovata(= L. ovataJira.'^.). In 

 canals, slow-flowing rivers, and large 

 drains throughout the mainland, but 

 more particularly in the central and 

 eastern counties (fig 5). 



(J) Var. boissyi Dupuy. In maritime 

 marshes and lakes and sometimes in 

 peat-bogs, but not typical in the latter 

 habitats. Especially common on the 

 west coasts of Clare, Mayo, and Donegal, 

 and is the form most commonly met with 

 on the western islands (figs. 2, 4). 



(fl) Var. lacustris Leach. In nearly 

 all the larger sheets of water through- 

 out the country, such as Lough Neagh, 

 Lough Erne, Lakes of Killarney, 

 LoughGill, and many others. This form, 

 according to the late Wm. Thompson, 

 is a deep-water one ; and certainly it is 

 seldom taken alive, and differs from the 

 shells living in the marshes and drains 

 connected with some of the lakes 

 mentioned above (figs. 1, 13). 



In the peaty mountain and similar 

 isolated tarns of the west coast, many 



