S3 30 Proceedings of the Royal Irish Academy. 



In J. G. Milne's list, thirty-eight species are recorded as living on Achill ; 

 two of these — Helix hortensis and Succinea putris — are certainly erroneous 

 records. Since then, twenty species have been added. Even now, I do not 

 think the list is complete, for Acicula lineata must surely occur somewhere on 

 the cliffs ; Balea perversa may linger in the same places, as it is met with on 

 the cliffs of Clare Island ; Acanthinula aculeata and A. lamellata are, perhaps, 

 in the woods at Glendarary, as these have been only superficially surveyed ; 

 and Lirntmca palustris or Alplecta hypnorum may lurk in some of the many 

 pools along the shores. The absence of Planorhis spirorbis appears to be real, 

 and is surprising when one considers its frequency on Clare Island and its 

 prevalence on the Curraun promontory. Helicella intersecta is another 

 unaccountable absentee from the present list, and plenty of suitable habitats 

 exist for Limax cinereo-niger. 1 



The Bills of Achill. 



This remote group of rocks was visited in June, 1910, by some members 

 of the survey — E. LI. Praeger, E. J. Welch, and A. D. Cotton — who have 

 reported that no specimens of mollusca were to be seen, though woodlice and 

 other small animals were abundant among the vegetation in the bird colonies- 

 On Lambay, in County Dublin (Irish Nat., xvi, 41-42), under somewhat similar 

 conditions, several species were collected among the debris of the nesting-places; 

 but it is possible that the molluscan fauna of The Bills has been exterminated 

 by the heavy Atlantic seas which must break over the rocks in winter time. 



The Black Eock. 



For Limax flavus J. W. Taylor (Mon. L. and F. W. Moll. II, 87) gives 

 the following record for West Mayo, " Black Eock Lighthouse, 1890. 

 E. Widdicombe." 



That this slug is native on the island, which, I learn, is but a sea-swept 

 stack, is scarcely possible. Mr. E. J. Ussher, who visited the island in 

 July, 1911, informs me that he only observed one species of flowering plant — 

 Armeria maritima — upon that occasion. 



It is most probable, therefore, that the specimens sent to the referees of 

 the Conchological Society had been brought from the mainland, with stores for 

 the lighthouse attendants. 2 (See record for L. flavus from Inishturk, p. 33.) 



1 For a list of the shells found on the neighbouring island of Inishhiggle and for various localities 

 and lakes on Achill, see J. G. Milne's paper (4). 



2 This opinion is shared by Mr. "W. Deuison Roebuck, to whom the specimens were 6ent by 

 Mr. Widdicombe. 





