.1909. Stet^fox. — Mollusca of N>W> Donegal. 91 



The habitat of Succinea elegavs calls for some comment, the 

 animals being found living on the short grassy slopes on the 

 cliffs facing the Atlantic on the western side of the island, 

 and also on the upper surfaces of dried cow-dung, where 

 their colour rendered them ver}^ difficult to see. In stormy 

 weather the}' must be constantly drenched with spray, which, 

 no doubt, accounted for the erosion of nearly all the 

 specimens. 



15th September. — This day was spent on the sandhills at 

 Keadew, and several of the small islands were worked, which 

 can be reached at low tide. In Arlands Lough the Boissyi form 

 of LimncEa peregja turned up again, but they were not such 

 extremely marked shells as those from Inishmeane. In this 

 lake Linuicsa auricnlaria, Playiorbis glaber, P. nauHleus, P. 

 spirorbis and Aplexa hyp7ioruni were also living. Mr. Collier 

 and Dr. Chaster took some veiy nice tj^pical Succinea elega^is 

 along the margin of a small stream running through the 

 dunes, quite unlike the form of this species which occurs in 

 most places in this district. 



As the weather did not improve we brought our holiday to 

 an end on the next da}' as far as west Donegal was concerned, 

 and returned to Derry, from which centre we worked 

 Magilligan sand-dunes, and finally went to Ballycastle, Co. 

 Antrim, for a couple of days. Our only discovery in these 

 parts was that of Helix hortensis at Downhill, Mr. Milne 

 beating a few specimens out of some long grass about a 

 quarter of a mile above Downhill on the waj' to Castlerock. 

 Only two adult specimens were taken, but young examples 

 were ver>" common, and all were of the bandless yellow form 

 which is undoubtedly the commonest in Ireland. This is the 

 first record of H. horteiins for Co. Derry, and although we are 

 all agreed as to the species, I have kept the specimens alive 

 and feeding in order to get the darts examined. 



In the above notes I have followed Dr. Scharff's nomencla- 

 ture as given^ in this Journal, vol. 1. With regard to the 

 Hyaliniae, it will be observed that I have not adopted the two 

 new species recently described by Mr. A. S. Kennard, F.G-S — 

 Vitrea hibernica and V. Scha?'ffii — for the reason that these 



* In the previous list, vol. xv., p. 65, Helix caperata was given instead of 

 Helix intersecia — the name used by Dr. ScbarfF. 



