Clare Island Survey — Lund and Fresh-water Mollusca. 23 21 



L. palustris Mull. — Occurred in one of the pools of Lough-na-phuca, where 

 a small rather deeply-sutured form was common. In the Harbour Pool 

 I took two large specimens during my last visit. 



L. truncatula Mull. — Generally distributed, but most plentiful on the face of 

 the cliffs of Croaghmore. Several white shells were taken by the late 

 Dr. Chaster in the bed of a stream, or perhaps it was a road — it is 

 frequently difficult to distinguish between these in certain places in the 

 west — above Craigmore. 



Ancylus fluviatilis Mull. — Common in all streams between the Abbey and the 

 Signal Tower ; but though many other suitable habitats occur, none 

 seemed to shelter this species. 



Planorbis spirorbis L. — Very local, and common only in the drains by the road- 

 side between the Harbour and Craigmore. Also lives in Lough-na- 

 phuca, in the marsh below the cliff of Knocknaveen, and round 

 L. Avullin, though in the latter localities not more than half a dozen 

 specimens were taken in all. All specimens seem referable to a stunted 

 form of Planorbis leucostoma Millet. 



P. crista L. — After repeated failures this shell was found in Creggan Lough, 

 where to judge from the number of young shells afterwards collected by 

 Welch, it is perhaps not rare. 



Acicula lineata Drap. — The type was taken in moss on the cliff of Knock- 

 naveen, but seemed exceedingly rare, only five or six examples in all 

 being found. On Croaghmore it appeared more plentiful, but none of 

 the var. alba — usually the more common form in Ireland — was met with. 

 Several specimens were taken in the latter locality clinging to the stems 

 of the moss Hypnum cupressiforme—an association commented upon by 

 J. A. Hargreaves in the Journal of Conchology (xii, 331) as being frequent 

 in Yorkshire. 



Valvata piscinalis Mull. — Taken by Welch in the outlet of Lough Avullin, where 

 during September, 1909, it was very plentiful. However, during my last 

 visit in July, 1911, scarcely a single specimen was seen. 



Pisidium subtruncatum Malm. — Occurred sparingly in Lough-na-phuca and 

 in the marsh at the base of the cliff of Knocknaveen. 



P.casertanumPoli. — Widely distributed and common in most parts of the island. 



P. pusiilum Gmelin. — Sparingly in Lough Avullin and in Creggan Lough on 

 my last visit, but not previously taken on the island. 



P. nitidum Jenyns. — Taken in Light-house Pool and near Craigmore. 1 



1 P. pulchellum appeared in my first notes as occurring on the island, but the specimens were after- 

 wards identified by B. B. Woodward as P. nitidum. I regret therefore that this shell was reported 

 by me from the island in Proceedings K.I. A., xxix, Section B, 125. 



