80 



Proceedings of the Royal Irish Academy. 



shaded habitats occur. It lives on 

 several of the western islands, and is 

 also recorded from Rathlin Island in 

 Antrim and Lambay in Dublin. In 

 most parts of the country the type is 

 commoner than the var. nitidosa, which, 

 according to Mr. J. W. Taylor,' is most 

 prevalent in the central districts. 



Hyalinia radiatula (Alder). 



Helix radiatula, Thompson, Cat. L. & 

 F. W. Moll, of Ireland, p. 19, 1840. 



WD ED LD AN 

 FE TY AR DO 

 WMSL LE MO 



EM RO CV LH 

 WG NG LF WH ME 

 SG KG KD DU 

 GL NT QG GW Wl 

 NK LK ST KK WX 

 SK MG EG WA 

 WG 



One of the most ubiquitous species 

 of the genus in Ireland, having a wide 

 distribution in all four provinces. The 

 green form and the type occur probably 

 in about equal numbers ; but in parti- 

 cular districts one of these may often 

 predominate. Recorded from Lambay, 

 in Dublin, and usually found on the 

 western islands. 



[Westerlund has recorded Hyalinia petronella 



mentions (Cat. L. & F. "W. Moll, of Ireland, 

 p. 18) that M. Michaud identified Irish 

 specimens of B. pura and S. radiatula as two 

 forms of H. nitidiila Drap. Michaud must 

 surely at this time have heen fully qualified to 

 recognize Drapamaud's species. 



' Mon. L. & F. W. Moll, of the Brit. Isles, 

 Vol. iii, p. 85. 



(Jharpentier as found in " Ireland." This 

 would appear to be an erroneous record, 

 Westerlund, like the late Dr. Gwyu Jeffreys, 

 probahly mistaking Zonitoides excavattts for 

 H. petronella. Mr. Taylor, in his monograph, 

 classes the latter shell as an alpine race of 

 S. radiatula.^ 



Zonitoides nitidus (Miiller). 



Helix lucida, Thompson, Cat. L. & F. W. 

 Moll, of Ireland, p. 19, 1840. Mya- 

 linia nitida, Scharfi, Irish Nat., p. 67, 

 1892. 



WO ED LD AN 

 FE TY AE DO 

 WMSL LE MO 



EM RO GV LH 

 WG NG LF WH ME 

 SG KG KD DU 

 GL NT QC CW Wl 

 NK LK ST KK WX 

 SK MG EG WA 

 WG 



Generally tlistributed, but only locally 

 common. Found on two of tlie 

 western islands, namely, Clare Island, 

 West Mayo, and Inishmore, Aran 

 Islands, Clare. Around the stony edges 

 of lakes in the limestone areas it is 

 perhaps most abundant ; but it can be 

 obtained by careful search in almost all 

 marshy places throughout the country. 

 Its principal variation is in colour. 

 The darkest specimens I have seen are 

 from Clare Island, which are of a rich 

 red-mahogany colour; and the palest 

 are from Queen's County. A rather 

 strongly striated form, with narrower 

 whorls, closely resembling some speci- 

 mens of Zonitoides excavati(s, I have 

 seen in several localities in the we.--t. 



