46 The Irish NaluralisL March 



NOTES ON NON-MARINE MOLLUSCA 

 FROM SOME IRISH LAKES. 



OBTAIiNEU BY MAJOR II. TRHVELYAN. 

 BY A. S. KENNARD, F.G.S., AND B. B. WOODWARD, F.L.S. 



It is, alas ! only too true that the molluscan fauna of many 

 of the smaller Irish lakes is practically unknown. R. A. 

 Phillips, Dr. Scharff, A. W. Stelfox, and R. Welch have 

 added greatly to our knowledge, but the number of these 

 smaller lakes is so large that it will be many years before 

 our information will be satisfactory. 



Difficulty of access is also an important factor, and this 

 is more painfully appreciated in the field than it is by an 

 examination of maps. It was, therefore, a matter of 

 congratulation to us when Major H. Trevelyan volunteered 

 to undertake the examination of some of these lakelets by 

 dredging, and to forward to us for examination the fresh- 

 water mollusca. We would here place on record our deep 

 obligation to this enthusiastic investigator, who spared no 

 trouble, and often had his boat carried many miles by 

 cart to reach some desired locality. We have not given 

 the depths at which the shells occurred, since they were 

 all taken in shallow water. We are indebted to E. W. 

 Bowell and A. W. Stelfox for kind assistance. 



Lough Tullynasiddagii, East Donegal. 



Liimicna preetcmiis, Bowell. Valvata piscinalis (Mi'ill.). 



palustris (Miill.). Sphctrium cornemn (1-inn.). 



Phyaa foniinalis (Linn.). Pisidiuni Slccnhuchii (Moll.). 

 Bithynia tcutnciilata (Linii.). 



Lough Scolban, Fermanagh. 



Planorbis albits, Miill. Bithynia hiilaculala (Linn.). 



Lough Acapple, East Donegal. 



LimucBa prcBtenuis, Bowell. Pisidium tniliinn Ilekl, [=gassicsi- 

 Bithynia tcntaculata (Linn.). anum, Dupny]. 



Pisidium subiniiicatum, Malm. pusillum (Gmel.) Jcnyns. 



obtusale (L;imk.). Slecnbuchii (Moll.). 



