288 JOURNAL OF CONCHOI.OGY, VOL, I3, NO. ID, APRIL, I9I2. 



H. nemoralis was not found at all commonly, and the specimens 

 which were seen resembled the last-named species in the extreme 

 tenuity of their shells. 



Limnaea involuta was obtained at Barley Lake, about four miles 

 from Glengariff and i,ooo feet above sea-level. 



The molluscs were plentiful but difficult to see ; all were resting 

 on stones at the water's edge, individually they were small, and only 

 one full grown specimen was taken. 



L. praetenuis was obtained in its original habitat — Lough Nagar- 

 riva — but, unlike the preceding species, was found on weeds instead 

 of on stones. 



Z. involuta could only be collected slowly and carefully by hand, ' 

 but Z. prcetenuis required to be removed with the scoop. 



The specimens were almost all immature, and extremely inclined 

 to be localised, even in the small area of this tiny mountain lough. 



They were not very numerous. 



L. pereger. — A variety of this species was taken at Lough More, 

 on the road between Glengariff and Bantry, at an elevation of about 

 600 feet. 



This variety is probably one of the intermediate forms, which there 

 can be little doubt exist between the type and the very aberrant 

 Z. involuta. The shells are characterized by their great fragility, 

 their deep sutures, and the very well marked striations in the lines 

 of growth. 



Mr. A. W. Stelfox considers this variety of Z. pereger to be identical 

 with one obtained by him at Graheen's Lough, Achill Island, West 

 Mayo, in April, 1909, which is figured in his List of the Land and 

 Freshwater MoUusks of Ireland (Proceedings of the Royal Irish 

 Academy, vol. xxix., section B., no. 3). 



Acicula lineata. — One specimen only was obtained of this 

 species. It was found under the moss on the stone wall of a bridge 

 over the Glengariff River, beyond the village. 



Ancylus fluviatilis. — This species is very common about Glen- 

 gariff; the shells are always fragile, and usually somewhat small. 



In Barley Lake specimens of the var. alba are found in considerable 

 numbers. 



Unio margaritifer. — The pearl mussel was only actually taken 

 from one locality — the little Owenacahina Stream, which runs from 

 Barley Lake down to the Glengariff River. 



U. fuargaritifer is also to be found in the Coomerkane River, and 

 in the lower reaches of the Glengariff River. 



