1910. STEI.FOX AND WKI.CH. — Rosapciina. — Molhisca. 175 



very meagre fauna. On the grass-covered slopes of the 

 eastern cliffs ten species were taken, viz., A griolhnax agrestis, 

 Amalia gagates, Ario7i ater, A. viteniiedhis^ Hyalinia alliaria^ 

 Helix TO hill data, H. jiemoralis, Piipa cylindracea^ Cochlicopa lu- 

 brica, and Clausilia bideiitata. Of these all but Amalia gagafes 

 and the last two species on the list were abundant, but only one 

 specimen of the Clausilia was taken, and both the others men- 

 tioned were rare. In Legrehy, Agriolimax agre^tis^ Avion 

 ater, A. intennediiis^ Hyalinia alliaria, H. nitidnla, H crystal- 

 Una^ Helix rotundata^ Pupa cylindracea^ and P. aiiglica, all 

 appeared to be fairly common, living either at the roots of the 

 plants or under stones. The Common Sorrel, Rumex Acetosa^ 

 which here grew to a height of at least two feet, seemed 

 particularly to attract the majority of the species mentioned, 

 and many specimens of Arion ater were seen feeding on its 

 leaves. Several additions to the above lists were made at the 

 western end of the island, where Agriolimax ag7'estis^ A. Icsvis^ 

 A??ialia gagates, Aiion ater^ A. interviediiiSj Vitrina pcllitcida^ 

 Hyalinia alliaria, Helix i^otundata^ H. nemoralis^ and Pupa 

 cyli7idi'acea were picked up. 



The freshwater shells taken by us, were Limncea peregra, 

 L. truncatiila, Plarwrbis crista, Pisidiuni personatuni and 

 P. casestamwi. All but the last species were taken at the 

 western part of the island, the eastern end only yielding 

 Pisidia. As several of the species showed certain insular pecu- 

 liarities, we think it necessary to give a few notes on the 

 various species. 



Agriolimax agrestis, L.— All the specimens lakeu were of an almost 



uniform pale brown, which had a slightly pinkish tinge. Many 



examples showed darker brown longitudinal stripes on each side of 



the shield similar to those usually to be seen on Umax niarginalus. 



A. laevis, Mlill. — One specimen only, under a stone on shore of 



Lough Ayes. Quite normal. 

 Amalia gagates, Drap. — All examples were very small, and all of a 



dark bluish slate-colour. 

 Arion ater, L. — Only the jet black form noted. 



A. intermedius, Normand. — Extraordinarily abundant on the cliffs; 

 almost all of the greyish form, with dorsal stripes, which so closely 

 resembles a pale A. hortensis, 

 Vitrina pellucida, Miill.— One dead shell on cliffs east of lighthouse. 



Normal. 

 Hyalinia alliaria. Miller.— Type rare, with the green and milky- 

 white forms fairly common. The shells of this species are of the 

 usual island type and are coarse in striation, large and flat, with a 



wide umbilicus. 



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