March. 1918. The Irish Naktralist. 33 



RECENT EXTENSIONS OF THE RANGE OF 

 PISIDIUM HIBERNICUM. 



BY R. A. PHILLIPS, M.R.I. A., AND A. W. STELFOX, M.R.I. A. 



(plates I., II.). 



Twenty-four years have now passed since Dr. Scharff 

 collected the original specimens of this fresh-water bivalve 

 mollusk in Lough Nagarriva, South Kerry ,1 and forwarded 

 them to the great Swedish conchologist, the late C. A. 

 Westerlund, who described them as new to science under 

 the name of Pisidium hihernicum.^ 



The shell was again taken in L. Nagarriva in 19073 

 and discovered in two neighbouring tarns in West Cork — 

 Lough Namaddra and a small unnamed tarn on Barraboy 

 Mountain. In more recent years Loughs Nagarriva and 

 Namaddra have been visited and specimens obtained by 

 Fleet-Surgeon K. H. Jones, R.N., Mr. H. C. Huggins, and 

 one of the writers (R. A. P.). While collecting in the Dingle 

 promontory in 1910 a shell w^as taken abundantly in many 

 tarns by A. W. Stelfox and Robt. J. Welch which was 

 thought at the time to be P. hihernicmn , and notes of its 

 occurrence in that district were inserted in the " Irish List "■* 

 then in the press. At the last moment, however, these 

 were deleted in deference to Mr. B. B. Woodward's opinion 

 that all the shells referred to were forms of P. ohtusale, with 

 the exception of the statement on p. 126 that P. hihernicitm 

 was " known to inhabit several lakes in South Kerry," which 

 was overlooked. At the time of publication this appeared 

 to be a mistake, L. Nagarriva being the only recorded station 

 for the species in South Kerry. Subsequent stud}- of the 



^ R. F. Scharff, Irish Nat., vol. iv., p. 335, 1895. [Here the lake 

 is wrongly stated to be in Co. Cork]. 



^ Nachricht. Deutsch. Malakozool. Gesellschaft, 26*^ Jahrg., p. 205, 

 •1894. 



^ J. N. Milne and A. W. Stelfox, Irish Nat., vol. xvi., p. 288. Plate 35 in 

 this volume shows the original habitat of the species. 



^Proceedings R. I. Acad., vol. xxix., Sect. B., No. 3. 



A 



