126 



Proceedings of the Royal Irish Academy. 



WD ED LD AN 



FE TY AE DO 

 WMSL LE MO 



EM RO CY LH 

 WGNC LF AYHME 



SG KC ED DU 

 CL NT QC CW ^^ I 



XK LK ST KE WX 

 SK MC EC WA 



wc 



Pisidium personatum Malm. 



WD ED LD AN 



FETY AE DO 

 WM SL LE MO 



EM EO CV LH 

 WC NG LF VVH ME 

 SG KC KD DU 

 CL NT QC CW WI 

 NK LK ST KK WX 

 SK ilC EC WA 

 WC 



Widely distributeil <m the mainland 

 and islands, and particularly common in 

 boggy areas. Only recently recognized 

 in this country by Mr. Woudward. 



Pisidium milium Hold, 



WD ED LD AN 

 FE TY AR 

 WMSL LE MO 



EM RO CV LH 

 WG NG LF WH ME 

 sCt KC KD DU 

 CL J^T QC CW WI 

 NK LK ST KK WX 

 SK MC EC WA 

 WC 



DO 



Generally distributed on tbe mainland 

 and islands. 



Pisidium hibernicum Westerlund. 



WD ED LD AX 



FE TY AE DO 

 WMSL LE MO 



EM EO CV LH 



WGNG LF WHME 



SG KC KD DU 



CL XT QC CW WI 



NK LK ST KK WX 



SK ^-fC EC WA 



WC 



Thi.s species, wliicb, like Limnaea in- 

 voluta and L. praefenuis, is unknown 

 outside Ireland, is now known to inhabit 

 several lakes in South Kerry and one in 

 West Cork. All of these lie at an 

 altitude of over 1,000 feet, and the 

 greater number of them are intensely 

 peaty. Its only associates so far ob- 

 seiTcd have been Limnaea praefenuis, 

 Ancyhis fluviatilis, and other Pisidia. 



Some English conchologists have con- 

 sidered this species to be a form of 

 Pisidium ohtusale ; but I learn from 

 Mr. Woodward that, judging by the 

 hinge, it is a good species, and that its 

 nearest ally in the Biitannic area is 

 Pisidium milium. 



Pisidium steenbuchi Moller. 



? Pisidium glolulare, Scharff, Ir. Xat., 

 p. 179, 1892. 



Though recorded as a fossil fiom Clare 

 and Kildare, this species Tvas until 1910 

 unknown in the living state in Ireland. 

 It, however, inhabits Keel Lough on 



