Stelfox — List of Land and Freshwater Mollusks of Ireland. 79 



Generally distributed, but most abun- 

 dant in the western and northern mari- 

 time counties, and extremely common 

 on tlie western islands, where the 

 greenish form usually predominates. A 

 white or cream-coloured form is also 

 frequently met witb in the west or on 

 the islands, and resembles a gigantic 

 H. piira. In some old woods, especially 

 in the south-western districts, a smaller, 

 more narrowly umbilicatcd and more 

 conical shell is often found, which con- 

 trasts greatly with the larger and flatter 

 shells living in more exposed situations. 

 The case of these two forms seems 

 analogous to the scharffi and hibernica 

 forms of Hyalinici cellaria. In the 

 Dingle peninsula Hyalinia alliaria 

 occurs from sea-level to the summit of 

 Brandon Mt., 3127 feet; and its alti- 

 tudinal distribution exceeds that of any 

 of our other Hyaliniae. 



Hyalinia nitidula (Drapamaud).i 



Kelix nitidula, Thompson, Cat. L. & 

 F. W. Moll, of Ireland, p. 18, 1840. 



WD ED LD AN 

 FE TY AR DO 

 WMSL LE MO 



EM RO GV LH 

 WG NG LF WH ME 

 SG KG KD DU 

 GL NT QG GW Wl 

 NK LK ST KK WX 

 SK MG EG WA 

 WO 



Distributed thi'oughout the four pro- 



' It has always been the custom in England 

 and elsewhere to regard the species here in- 



vinces, but seldom met with in real 

 abundance. The prevailing form seems 

 to resemble the Hyalinia niUns of 

 IMichaud. The var. helmi is occa- 

 sionally met with in colonies, and on 

 the great talus of Fair Head in Antrim, 

 and in a similar position at the base of 

 the north cliffs of Achill Island, "West 

 Mayo, it occurs without the type. 

 This species is often found on the 

 western islands ; but it is usually rare, 

 and appears to be losing ground both 

 on the islands and on the mainland, 

 perhaps owing to the increase of culti- 

 vation and the consequent diminution 

 of sheltered habitats. 



Hyalinia pura (Alder). 



Helix pura, Thompson, Cat. L. & F. "W. 

 Moll, of Ireland, p. 18, 1840. 



WD ED LD AN 

 FE TY AR DO 

 WMSL LE MO 



EM RO GV LH 

 WG NG LF WH ME 

 SG KG KD DU 

 GL NT QG GW Wl 

 NK LK ST KK WY 

 SK MG EG WA 

 WG 



Generally distributed, and may be 

 found wherever suitable mossy and 



tended as the Hyalinia nitidula of Draparnaud ; 

 but the figure given by this authority in his 

 Hist. Nat. Moll. terr. et tluv. de la France, 

 p. 117, pi. viii., more resembles E. pura Alder. 

 The belief that Draparnaud intended to describe 

 H. pura is strengthened by his distinctly in- 

 cluding R. radintida Alder as a variety under 

 his nitidula. This belief is still further 

 strengthened by the fact that Wm. Thompson 



