Some Waifs and Strays of the Cork Flo7'a 335 



H. murinum, L. — Admitted by Alliii as a casual only, is still 

 abundant on rocks at Haulbowline, where it was first noticed by the late 

 Mr. J. Sullivan, and is also plentiful at Fort Carlisle, Cork Harbour, where 

 I found it three years ago. 



AN ADDITION TO THE IRISH MOLLUSCAN 



FAUNA. 



BY R, F. SCHARFF, PH.D. 



Towards the end of last year, Dr., Westerlund described in 

 the Nachrichtsblatt der deutschen Malakozoologischen Gesellschaft 

 (26ter Jahrg., 1894, p. 205), a new species of Pisidium from 

 Ireland which he named Pisidmm hibernicum. 



As no figure is given with the description, I herewith add 

 an outline sketch (three times natural size) of the shell, so as 

 to facilitate future diagnosis. I may mention that I discovered 

 the species during the summer of 1893, in a small mountain 

 tarn known by the name of Lough Nagarriva, about 1,200 feet 

 above Glengariff, in the County Cork, and sent it to Dr. 

 Westerlund for identification. The shell is thin, of a yellowish 

 green colour, and remarkably ventricose, so much so that its 

 breadth is equal to its height. It resembles Pisidium obtzisale, 

 but is much more globular. Not only is it equal in breadth 

 and in height, but also in length (see figures). 



The following is Dr. Westerlund's description : — 



Pisidium (Fossarina) hibernicum. — C. supra medium ventri- 

 cosissima, lateribus leviter convexis regulariter ad marginem inferum 

 declivis, truncato-ovata, ubique sulcato-striata, marginibus omnibus 

 regulariter arcuatis, parte posteriore brevissima, anteriore duplo longiore, 

 ad margines compressa, sed obtusissima ; umbones validi, lati, tumido- 

 rotundati, prominentes. Long. 3I, rect. 3^, cr. 3^ mm. 



