128 XEROPHILA ITALA. 
VARIATIONS IN SUBSTANCE OF SHELL. 
Var. vitrea Dumont & Mortillet. 
Helix ericetorum vay. vitrea Dum. et Mort., Moll. Savoie, 18357, p. 59. 
Helix ericetorum var. vitrea Wattebled, Journ. de Conch., 1889, p. 325. 
The var. vitrea Dum. & Mort. is described as white, quite 
vitreous and transparent ; the var. vitrea of Wattebled is trans- 
parent and of a whitish colour. 
SCOTTISH DISTRIBUTION, 
Ebudes Mid—Thie sub-var. witrea of Wattebled, the Island 
of lona ! Rev. G. A. Frank Knight. Fic. 193.—\" fta/a var 
Main Argyll—Roadside, Acheran, Lismore ! A. Somerville. : Soe mt 
FOREIGN DISTRIBUTION. Rey. G. A. F. Knicht. 
France—Var. rifrea D. & M., banks of River Arve, near 2 
Geneva, Savoy, Dum. & Mort., le. ; sub-var. vitrea Wattebled, rare at Champigny, 
Jura, Wattebled, le. ; and Dr. Debeaux records white and excessively thin shells 
from Baréges, Hautes Pyrénées. 
According to Dr, P. Fischer, in the voleanie region of Auvergne, the Y. ita/a and 
certain other species are remarkable for their pellueid and excessively thin shells. 
VARIATIONS [IN COLOUR OF SHELE. 
Var. alba Moquin-'l'andon. 
Hlelix ertcetorum var, 6 Charpentier, Moll. Suisse, 1837. p. 12, pl. 1. f. 18. 
Helix ericetorum var. alba Moquin-Tandon, Hist. Moll. France, 1833, p. 253. 
Helix ertcetorum var. concolor Picard, p.p. Moll. Somme, 1840, p. 235. 
The var. alba Mogq.-Tand. is deseribed as entirely white. 
The sub-var. econeolor of Picard comprises a totally 
white form, but also embraces a reddish-white variety, from 
which I have separated it. 
The H. ericetorum var. 6 of Charpentier, which he deseribes 
as “ tota alba,” and as frequent in the neighbourhood of Bex, 
Switzerland, I have ventured to assume should be referred to var. alba. 
Though it is by no means certain that any of these authors had the truly albine 
variety in view when describing this form, yet | have assumed them to have had 
knowledge of it, and that it was the form indicated. 
The var. alba of Jeffreys is probably referable in part to the var. concolor D. & M. 
The true albine variety though uncommon is widely dispersed in this country, and 
also oceurs on the continent, as has been firmly established by the efforts of Mr. 
F. H. Sikes and Dr. W. Eagle Clarke, but the foreign records are all more or less 
uncertain as to their precise nomenclature. 
Mr. J. G. Milne mentions a small colony of the var. a/ba on Achill Island, near 
Dugort, in West Mayo, whose range was limited to an area of dry white sand, 
without noticeable vegetation. 
Fic, 194.—\.. ‘tala var. 
alba Moquin- Tandon. 
BRITISH DISTRIBUTION 
England and Wales—Its occurrence has been veritied from Buckinghamshire, 
Berkshire, Cambridge, Carmarthen, Cornwall West, Denbigh, Derby, Devon North, 
Dorset, Durham, Essex North, Gloucester, Hants North, Hereford, Hertford, Kent, 
Leicester and Rutland, Lincoln North, Norfolk, Northampton, Northumberland, 
Nottingham, Oxford, Pembroke, Radnor, Salop, Somerset North, Suffolk East, 
Sussex East, Yorkshire, and Isle of Man. 
Scotland —It has been verified for Mid Ebudes, Fifeshire and West Sutherland. 
Ireland—It has been found in Londonderry, Antrim, Donegal, Dublin, King’s 
County, Mayo, Galway, Clare, North Cork, and Kerry. 
FOREIGN DISTRIBUTION. 
France—Recorded from St. Jean de Luz, Basses Pyrénées ! by Mr. F. H. Sikes; 
from Grasse, Alpes Maritimes, by Moquin-Tandon; and from the dunes of Dunkirk, 
Nord, by Dr. Bouly de Lesdain. It is also on reeord from the Gironde, Hautes 
Pyrénées, Landes, Oise, and Seine. 
Switzerland — The var. 4 of Charpentier is noted as frequent about Bex, 
Canton Vand. . 
Spain—Found by Dr. W. Eagle Clark in May, 1889, at 5,700 feet altitude at 
Canillo, Republic of Andorra! 
