HYALINIA CRYSTALLINA. Dis 
In Germany, it is recorded with H. subterranea by Dr. Kobelt from the 
loess of the Rheingau in Nassau. 
In Belgium, it is found very commonly in the “Tourbe” of Uccle les- 
Bruxelles by Grégoire. 
In France, M. Locard records it from the Upper Tertiary Freshwater 
Molasse strata of the Dauphiné and near Lyons ; by ‘lournoiier it is cited 
from the tufa of La Celle near Moret, Seine et Marne; by Picard from 
the quartzose sands of Menchecourt in the Somme ; and by Von Ihering 
from the tufa of Ober-Zaunsbach, French Switzerland. 
In Denmark, it is reported by Mr. Kennard from the site of an ancient 
“kitchen-midden” at Meilgaard on the north coast of Jutland, and from 
deposits of the Stone age in Bornholm. 
Variation.— /7. crystallina tends to be of a more generalized form and 
according to Dumont and Mortillet has its specific characters more faintly 
developed in mountainous regions than in the plains, yet the variation is 
very restricted, as no striking modifications in the colour have yet been 
chronicled, the nearest approach being the opaque white form, resulting 
from a larger proportion of calcareous matter being incorporated with the 
shell substance. 
The closer or looser coiling of the whorls, resulting in a wider or a 
narrower umbilicus, is the feature which has been cliefly noted for 
varietal differentiation, though Baudon has instituted a var. nitidissima 
for the small and unusually glossy individuals found in stony places at 
Garenne dHoudainyille in the Oise. 
VARIATION IN SHELL. 
Var. contracta Westerlund. 
Zonttes crystallinus var. contracta Westerlund, Fauna Moll. Suec., 1873, p. 56. 
Hyalina contracta Clessin, Jahrb. Mal. Gesellsch., 1875, pl. 2, f. 1, p. 32. 
Hyalina dubrueili Clessin, Mal. L!., 1877, pl. 1, f. 4, p. 128. 
Differs from the typical erystallina in its smaller shell, narrower umbilicus, 
the still more gradual increase in size of the whorls, the last hardly exceeding the 
penultimate in diameter, and in possessing an additional whorl. 
The H. erystallina var. subrimata Reinh. is possibly practically identical with 
the var. contracta, differing chiefly in its somewhat looser coiling. 
Sek BY 
Tete 
lic. 153. hic. Lok. 
Fic. 153. —//. contracta Clessin, showing frontal, basal, and upper aspects, x 6 (after Clessin). 
Fic. 154.—H/. dubruetli Clessin, showing frontal, basal, and upper aspects, x 6 (after Clessin). 
The sub-var. dubrueili is said to differ from yar. contracta only in its slightly 
wider umbilicus and rounder ultimate whorl. 
ENGLAND AND WALES. 
Devon S.—Haldon and Stoke woods (Marquand, J. of Coneh., 1889, p. 138). 
Devon N.—Vellacot’s Pool, near Rockford, April 1908 ! A. H. Jowett-Murray. 
Somerset N.—Near Minehead, Ang. 1892 ! C. Oldham. 
Wilts. N.—Purton Marsh ! and Braydon woods, Apl. 1907 ! Rey. J. Going. 
Surrey—Putney, July 1888 ! G. K. Gude. 
Norfolk E.—Whitlingham woods, Rey. S.S. Pearce. Costessey ! A. Maylield. 
Montgomery—Abernant, Llanfyllin, Nov. 1886! J. Bickerton Morgan. 
Derby—Moderately common, Clifton, Aug. 1889 ! Lionel E. Adams. 
Lancashire $.—Broeckholes wood, near Preston, Feb. 1889! W. H. Heatheote. 
Lancashire Mid—larington, Feb. 1889! W. H. Heathcote. 
Durham—Finechale Abbey, June 1885 ! Baker Hudson. 
Isle of Man—Among moss on cliffs overlooking the sea, Glen Maye, Sept. 1891 | 
3/9/08 H 
