244 ARION INTERMEDIUS. 
Parasites.—'l'lis species is at times infested with a tiny Acarus of a 
white colour, which in size, general aspect, and activity resembles the 
ordinary Acarus of our larger slugs. 
Variation.— The variability of this species is not great, but it 1s 
suggestive that in the south-west corner of Lreland the specimens generally 
are much darker coloured and more strongly banded than those found in 
England. How far this may be an effect of the moister climate, and how 
much may be attributed to their retention of the darker colourmg said by 
Mr. Gain to be a characteristic of the earlier stages of life in England, is 
uncertain, but it is worthy of note that this most general retention of 
immature colouring should be in stations furthest removed from the most 
active evolutionary centre and where the last remaining stronghold of 
Geomalacus is located. 
VARIATIONS IN COLOUR AND MARKINGS OF ANIMAL 
Var. alba 'T'aylor. 
ANIMAL almost pure white. 
, ENGLAND AND WALES. 
Cambridge—Grantchester, Sept. 1904 ! Hugh Watson. 
Carmarthen—Near Llanelly, Sept. 1904 ! H. Rowland Wakefield. 
& IRELAND. 
Dublin—Ditch, Foxhall Demesne, Raheny ; and Killakee, Dublin Mountains, 
Sept. 1890 ! R. F. Scharff. 
Galway W.—Renvyle and Kylemore, March 1891, R. F. Scharff. 
Var. normalis Moquin-'andon, Hist. Moll. France, 1855, p. 16. 
Arion flavus var. normalis Moquin-Tandon, l.c. 
ANIMAL yellow, with blackish head and tentacles. 
Antrim—Belfast, Dec. 1891, R. F. Scharff. 
Clare —Woodpark, Scariff, Sept. 1904! N. F. Hibbert. 
Kerry—Great Skellig (R. F. Scharff, Irish Nat., Jan. 1898, p. 11). 
CONTINENTAL DISTRIBUTION. 
France—Pas de Calais (Bouchard-Chantereux, Moll. Pas de Calais, 1838, p. 23). 
Var. pallida Moquin-T'andon, Hist. Moll. France, 1855, p. 16. 
Arion flavus var. pallidus Moquin-Tandon, l.c. 
Arion flavus var. albidus Moquin-Tandon, l.c. 
ANIMAL pale, back pale cinereous, with yellow or orange shield. 
The sub-var. albida is whitish, yellowish beneath and also on the shield, head 
and tentacles blackish. 
IRELAND. 
ENGLAND. 
Cornwall E.—Stenalee, St. Austell, Sept. 1904 !C. P. Richards. 
Devon N.—Belstone, Okehampton Sept. 1904 ! Miss Daisy Mason. 
IRELAND. 
Roscommon—Mote Park, Sept. 1904 ! Lord Crofton. 
Leitrim—Drumkeeran, Oct. 1904 ! Rev. J. Meehan. 
Waterford—Clonmel, Rev. A. H. Delap. 
CONTINENTAL DISTRIBUTION. 
France—V. pallida and sub-v. albida, Pas de Calais (Bouchard-Chantereux, l.c. ). 
Var. plumbea Collinge, Conch., 11., 1892, p. 63. 
ANIMAL dark-grey ; shield and tail only slightly tinged with orange ; foot-sole 
cream, somewhat darker medially. 
This is the var. grisea of Roebuck. 
ENGLAND AND WALES. 
Cornwall E.—Stenalee, St. Austell, Sept. 1904! C. P. Riehards. 
Devon N.—Belstone near Okehampton, Sept. 1904 ! Miss Daisy Mason. 
Suffolk E.—Mendlesham, Oct. 1904! A. Mavtield. 
Norfolk W.—Didlineton Hall, Sept. 1904 ! Hon. Mrs. Evelyn Ceeil. 
Northampton—Kettering, Sept. 1904! C. E. Wright. 
Gloucester W.—Symonds Yat, Sept. 1904 ! W. C. Blake. 
Hereford—Garden, Acacia Villa, Ross, Sept. 1904 ! W. C, Blake. 
