Stelfox — List of Land and Freshwater Mollusks of Ireland. 117 



water in which it lives ; for it is fre- 

 quently met with in peaty di-ains, with 

 no other associates save Pisidia. 



WD ED LD AN 

 FE TY AR DO 

 WMSL LE MO 



EM RO CV LH 

 WG NC LF WH ME 

 SG KG KD DU 

 CL NT QG CW wi 

 NK LK ST KK WX 

 SK MG EC WA 

 . WC 



Planorbis fontanus (Lightfoot). 



Selix fontana, Brown, Mem. Werner. 

 Soc, vol. ii, p. 524, 1818. Planorbis 

 nitidus, Thompson, Cat. L. & F. W. 

 Moll, of Ireland, p. 37, 1840. 



WD ED LD AN 

 FE TY AR DO 

 WMSL LE MO 



EM KO CV LH 

 WG NG LF WH ME 

 ^G KG KD DU 

 GL NT QG GW WI 

 NK LK ST KK WX 

 SK MG EG WA 

 WC 



Generally distributed, but becomes 

 rare towards the south, west, and 

 north, its headquarters being, like that of 

 so many of our other freshwater shells, 

 situated in the central counties. In 

 habits it is similar to Planorbis crista, 

 and is seldom found in deep water, pre- 

 ferring the grassy margins of canals, 

 ditches, or lakes, wliere it is occasionally 



abundant. It is rare to find specimens 

 of more than medium size, but in Castle- 

 bar Lake in West Mayo, during Sept., 

 1909, I took several shells measuring 

 6'25 mm. in diam. 



PHYSIDAE. 



Physa fontinalis (Linn6). 



Bulla fontinalis Brown, Mem. Werner. 



Soc, vol. ii, p. 516, 1818. 



WD ED LD AN 

 FE TY AR DO 

 WMSL LE MO 



EM RO CV LH 

 WG NG LF WH ME 

 SG KG KD DU 

 GL NT QG GW WI 

 NK LK ST KK WX 

 SK MC EG WA 

 WC 



Though recorded for all divisions, 

 this shell is seldom met with in the 

 peat-covered areas of the west or north, 

 und has not been recorded from any of 

 the western islands. Over the central, 

 south-eastern, and north-eastern dis- 

 tricts it is one of our commonest fresh- 

 water species. 



Aplecta hypnorum (Linne). 



Bulla Hypnorum, Brown, Mem. Werner. 

 Soc, vol. ii, p. 517, 1818. Plujsa 

 hypnorum Thompson, Cat. L. & F. W. 

 Moll, of Ireland, p. 34, 1840. Aplexa 

 hypnorum, ScharfE, Irish Ifatiiralist, 

 p. 151, 1892. 



Much more local than Physa fon- 



