Clare Island Survey — Land and Fresh-water Mollusca. 23 7 



List of Species found on the Mainland as yet unknown from the 



Islands. 



Limax niaximus. Physa fontinalis. 



Pyramidula rupestris. Aplecta hypnorum. 



Vertigo angnstior. Paludestrina ventrosa. 



Succinea putris. P. jenkinsi. 



S. oblonga. Bithynia tentaculata, 



Phytia myosotis. Yalvata cristata. 



Limnaea stagnalis. Neritina fluviatilis. 



Planorbis albus. Margaritana margaritifera. 



P. contortus. Anodonta cygnea. 



P. fontanus. Sphaerium corneum. 



Four species have been taken on the islands not yet recorded from the 

 mainland: — Limax cinereo-niger, Pupa museorum (fossil), Pisidium steenbuchi, 

 and P. hibemicum. All of these are, of course, known from the mainland in 

 other parts of Ireland. 



Four species are known from Clare Island which have not been reported 

 from the other islands : — Lirnax cinereo-niger, Hdicella intersecta, Acanthinula 

 lamelluta , and Valvata piscinalis. 



Six species are recorded for Achill Island not known to occur on the 

 other islands : — IAmiwea auricularia, Planorbis glaber, Paludestrina stagnalis, 

 Pisidium pulchellum. P. steenbuchi, and P. lilljeborgi. 



Three are found on Inishbofin not yet known on any of the other islands : — 

 Vidloni'i costata (fossil), Pupa museorum (fossd), and Pisidium hibemicum. Of 

 these three, the first two occurred in the deposit described on p. 51, and have 

 not been found in a living state on Inishbofin. 



Helicella barbara has been taken on the islands of Achill and Bofin, 

 but not on Clare ; Hygromia fu.sca and Arion circumscriptus on Clare Island 

 and Achill Island ; while Acanthinula aculeata has been taken only on Clare 

 Island and in the deposit on Inishbofin. All these species are frequent in the 

 mainland except //. baroaru, which has been found only upon the sand-dunes 

 of The Mullet, 



5. EAEE SPECIES FOUND IN THE DISTEICT. 



In a group like the land and fresh-water Mollusca, in which so much 

 work has been done in Ireland, there was little expectation of finding any 

 new shells ; it was, however, hoped that during the present survey, some of 

 our more local western species might be found to possess a wider distribution 



