138 The Irish Naturalist. Augitst, 



Limnaea prsetenuis was obtained in its original habitat, Lough Nagar- 

 riva, but unlike the preceding species, %vas found on weeds instead 

 of on stones. Limnaea involuta could only be collected slowly and 

 carefully by hand, whereas Limnaea prcBtenu is required to be removed 

 with the scoop. The specimens were almost all immature and 

 extremely inclined to be localized in patches, even in the restricted 

 area of this little mountain tarn. They were not very numerous. 



Limnaea peregra. — A variety of this species was taken at Loughmore, on the 

 road between Glengarriff and Bantry, at an elevation of about 600 

 feet, or less. This variety is probably one of the intermediate forms, 

 which there can be little doubt exists between the type and the 

 very aberrant Limnaea involuta. The shells are characterized by 

 their great fragility, their deep sutures and the very well marked 

 striation in the lines of growth. Mr. A. W. Stelfox considers this 

 variety to be identical with one obtained by him at Sraheens 

 Lough, Achill Island, West Mayo, in April, 1910, which he has 

 figured in his list of the Land and Freshwater Mollusca of Ireland 

 {Proc. Royal Irish Acad., vol. xxix.. Sect. B., No. 3.) 



Ancylus fluviatilis. — This species is very common about Glengarriflf, 

 the shells are always fragile and usually somewhat small. In Barley 

 Lake, specimens of the variety alba were found in considerable 

 numbers and of a good size. 



Acicula lineata. — One specimen was taken under moss on the wall of 

 the bridge over the Glcngarrifif River, beyond the village. 



Margaritana margaritlfera. — The Pearl-mussel was only actually taken 

 from one locality, the little Owennochahina stream, which flows 

 from Barley Lake into the Glengarriff River. The species is also 

 to be found in the Coomerkane River, and in the lower reaches of 

 the Glengarriff River. The little stream mentioned above is only 

 three or four feet wide, and perhaps two, or two and a half deep, and 

 in it the molluscs are only found in the two hundred yards or so 

 nearest to the river, where the rivulet runs through almost fiat 

 meadows. There are no Margaritanae in the Glengarriff River 

 itself at this point, although in the stream they are abundant. The 

 natives capture these mussels by inserting a thin pointed stick 

 between the open valves, which is easily done in clear water, and 

 on it the mollusc at once closes them and is then withdrawn from 

 the bed of the stream, clinging tightly to the end of the switch. The 

 specimens obtained here were rather small, of an elegant shape, and 

 thin of shell. Pearls are said to be rare, so doubtless mussels would 

 be rare also. 



Plsidlum hibernicum. — A few small specimens were found in Lough 

 Xagarriva, where they appeared to be climbing on weeds. 



P. pusillum. — This species was taken in considerable numbers at the 

 two loughs of Avaul, on the road to Castletown and about four 

 miles from Glengarriff. It also occurred very sparingly in Coomer- 

 kane Lough, a partially drained lake at the head of the valley of 

 the same name. 



