118 



Proceedings of the Royal Irish Academy, 



lis, although it has a wider range 

 and occurs in those western and northern 



WD ED LD AN 



FE TY AR DO 



WMSL LE MO 



EM RO CV LH 

 WG NG LF WH ME 

 SG KG KD DU 

 CL NT QC CW wi 

 NK LK ST KK WX 

 SK MC EG WA 

 wc 



areas in which that shell is not found. 

 It has also heen taken on Inishmeane in 

 West Donegal. 



This shell is seldom found without 

 Planorhis spirorhis var. leucostoma, an 

 association which has often heen re- 

 marked on ; hut it is scarcely so univer- 

 sally distributed as this species, P. 

 spirorhu frequently occurring without 

 A. hypnorum. 



PALUDESTRINIDAE. 

 Paludestrina confusa (Fraueufeid). 



WD ED LD AN 



FE TY AR DO 

 WMSL LE MO 



EM EO CV LH 

 WGNG LF WHME 



SG KG KD DU 

 CL NT QC GW WI 



NK LK ST KK WX 



SK MC EC WA 

 WC 



Added to oui' fauna in 1908 by 

 Mr. Phillips, P. confusa has now been 



taken by that conchologist in great 

 quantities in the brackish waters and 

 marshes of the Rivers Shannon, Suir, 

 Barrow, and Nore. The Irish form, 

 Mr. Phillips writes me, is uniformly 

 smaller than the English, as the latter 

 is smaller than that of the Continent. 



Paludestrina ventrosa (Montagu). 



Hydrohia ventrosa, Soharff, Irish Nat., 

 p. 178, 1892. 



WD ED LD AN 

 FE TY AR DO 

 WMSL LE MO 



EM RO CV LH 

 WG NG LF WH ME 



SG EC KD DU 

 CL NT QC CW WI 



NK LK ST KK WX 

 SK MC EC WA 

 WC 



Common in several estuaries on the 

 eastern, north-eastern, and western 

 coasts. On the Aran Islands it lives in 

 a brackish pool associated with Palu- 

 destrina jenkinsi. 



Paludestrina jenkinsi Smith. 



Hydrohia JenUnsi, Adams, Irish Nat., 

 p. 234, 1897. 



Since its first discovery in this country 

 by Mr. Welch in 1896, this species has 

 been taken in nearly all the maritime 

 counties, and has become alarmingly 

 abundant in many districts, greatly 

 to the inconvenience of competing 

 species. It is also abundant in the 



