HYALINIA RADIATULA. 93 
In Belgium, according to Van den Broeck, the species exhibits similar 
characteristics, the examples from the mountainous region of the Ardennes 
showing a more strongly sculptured shell with a different facies to that 
exhibited by the individuals from the plains, in which the radial striation 
is much less definite. 
The Z. subradiatulus Fagot, from mossy limestone rocks by the castle 
of Bramevaque in the Pyrénées, differs in its closer, finer, and more 
regular striation, and its slightly narrower umbilicus. 
The H. viridulu of Menke is probably quite identical with the var. 
viridescenti-alba of Jeffreys, and will take precedence of that name. 
VARIATION IN SHELL. 
Var. viridula Menke. 
Flelix viridula Menke, Syn., ed. ii., 1830, p. 127. 
Zonites radiatulus var. vitrina Gray's Turton’s Manual, 1840, p. 174. 
Zonites striatulus var. albinos Moq.-Tand., Hist. Moll. France, 1838, ii., p. 86. 
Zonites striatulus mut. vityea Schmidt. 
Helix radiatula var. concolor Dum. and Mort., Hist. Moll. Savoie, 1857, p. 234. 
Zonites radiatulus var. viridescenti-alba Jeffreys, Brit. Conch., 1862, p. 160. 
Original Description. —‘‘ Helix viridula, m. H. testa orbiculato-convexiuscula, 
umbilicata, tenui, glabra, pallide viridicante, pellucida, nitida; apertura sub- 
rotunda: labro simplici. Alt., 1 lin. ; lat., 1¢ lin.”.—C. T. MENKE, Syn. Moll., 
2nd ed., 1830, p. 127. 
The sub-var. viridescenti-alba Jeffreys is described as greenish-white. 
The sub-var. albinos of Moq.-Tand. is described as entirely whitish. 
The sub-var. vitrina Gray is described as transparent, greenish-white. 
The sub-var. coneolor Dum. and Mort. is described as pale, unicolorous, and 
hyaline. It is considered as a tendency to albinism induced by shade and moisture. 
The shell is often slightly Jarger than the type, but not so large as H. petronella, 
from which it differs by its slightly flattened last whorl and oval mouth. 
The original description of Menke’s H. viridula indicates the transparent pale 
greenish form, which Herr Clessin regards as the marsh variety of H. pura. I, how- 
ever, agree with Dr. E. von Martens in thinking this form more correctly referable 
to radiatula, as English specimens of the undoubted var. viridescenti-alba were 
found, after careful comparison by him, to be quite identical with authentic speci- 
mens of H. viridula preserved in the Berlin Museum. The view that H. viridula 
is synonymous with H. radiatula has also been adopted by American conchologists. 
The name in its strict sense is, therefore, adopted for the variety, superseding 
Dr. Jeffreys’ name. 
This variety is also probably the Hyalina hammonis var. virescens of Esmark. 
ENGLAND AND WALES. 
Devon N.—In woods with type at Countesbury, Aug. 1892, Lionel E. Adams. 
Wilts. N.—Melksham, 1905 ! E. W. Swanton. 
Wilts. S.—Dinton, 1905! Hugh Wyndham. 
Essex S.—High Beach, Epping Forest, May 1906, J. E. Cooper. 
Middlesex—Mill-Hill near Ealing, 1885, F. Fenn. 
Bedford—W oburn Sands, Sept. 1905 ! F. H. Sikes. 
Worcester—Turner street, Sparkbrook, Birmingham ! W. Nelson. 
Stafford—Caldon Low, Dec. 1888 ! and High Shut near Cheadle, T. F. Burrows. 
Cannock Chase near Stafford, 1884, Lionel E. Adams. 
Salop—(Jettreys, Brit. Conch., 1862, i., p. 166). 
Merioneth—Torrent Walk, Dolgelly, April 1888 ! G. W. Mellors. Fairly com- 
mon at Fairbourne, Aug. 1907, A. H. Jowett-Murray. 
Derby—Near Clifton, with type, Aug. 1889 ! Lionel E. Adams. 
York N.E.—Gravel pit, Farwath Bridge, Aug. 1886 ! W. Denison Roebuck. 
York S.W.—Roydhouse Wood near Hudderstield, April 1876 (Peace, Sei. Goss., 
July 1876, p. 161). Penistone, Nov. 1890, Lionel E. Adams; and Bullelitte Wood, 
1904 ! F. Booth. 
York Mid W.—Shipley Glen near Bradford, Sept. 1882 ! W. West. Crossgates, 
Jan. 1894 ! W. Nelson. Rombald’s Moor, Ilkley ! F. W. Fierke. 
York N.W.—Banks of river Clough near Low Fawes, Aug. 1887! B. Hudson. 
Durham—Var. Helix vitrina Veér., Gibside Wood ! (J. Alder, Suppl. Neweastle 
list, 1838, p. 340). 
Cumberland—Very rare, Wreay Wood (Miss Donald, Cumberland list, p. 57). 
Isle of Man—Peel, Aug. 1890, R. Cairns. 
