Stelfox — Z//s/ of Land and Freshwater MoUiisks of Ireland. 85 



Pyramidula rupestris (Draparnaud). 



Helix umbih'cafa, Thompson, Cat. L. 

 and F. W. Moll, of Ireland, p. 17, 

 1840. B:. rupestris, Scliarff, Irish 

 Nat., p. 106, 1892. 



WD ED LD AN 



FE TY AE DO 



WMSL LE MO 



EM RO CV LH 

 WG NG LF WH ME 

 SG KG KD DU 

 CL NT QG GW wi 

 NK LK ST KK WY 

 SK MG EG WA 

 WC 



"Widely distributed over the Car- 

 boniferous limestone of the central 

 plain, and also occurs in several isolated 

 colonies on the Chalk in Antrim. 

 Between the Antrim Cbalk and the 

 nearest habitat of this species on the 

 Carboniferous formation lie many miles 

 of country from which the shell has 

 never been recorded. In the south 

 P. rtipestri^ is often found on old 

 mortared walls and other buildings 

 many miles from the nearest limestone 

 area. On the Antrim coast in one 

 spot it has certainly spread from the 

 Chalk on to the adjoining basalt ; its 

 distribution is therefore not altogether 

 governed by the presence or absence of 

 a pure limestone. It, however, seems 

 to prefer districts where limestone 

 predominates, and the only island on 

 which it has yet been found is com- 

 posed of this rock : this is Inismore, 

 in the Aran Islands, where the beauti- 

 ful var. virideseenti-alla occurs sparingly 

 with the type. On the bleak summits 



of the Leitrim mountains which pro- 

 trude from the peat-covered areas this 

 shell sometimes occurs in great profu- 

 sion. On one of these hilltops not 

 many feet in circumference, completely 

 isolated by the surrounding peat, and 

 at an altitude of over 1400 feet, I 

 have taken this species, associated with 

 Agriolimax agrestis, BJyaUnia alliaria, 

 JHucomdiis fulvus, Avion subfuscus, Hy- 

 gromia hispida, and Pupa eylindracea. 

 Thompson's old record for " Scrabo, 

 Co. Down," has never been verified, 

 though often searched for. As there are 

 no specimens in the Thompson collection 

 from this division, it is not included iu 

 the present list. 



Pyramidula rotundata (Miiller). 



Helix radiata, Brown, Mem. Werner. 

 Soc, vol. ii., p. 525, 1818. H. 

 rnfundata, Thompson, Cat. L. & F. 

 W. Moll, of Ireland, p. 16, 1840. 



WD ED LD AN 

 FE TY AR DO 

 WMSL LE MO 



EM RO GV LH 

 WC NG LF WH ME 

 SG KG KD DU 

 CL NT QG GW WI 

 NK LK ST KK WX 

 SK MG EG WA 

 WG 



Common and us\ially abundant 

 throughout the entire mainland and 

 islands. The principal variation is an 

 almost unicolorous form which lives 

 iu the old native woods iu all districts. 



