HYALINIA CELLARIA. ore 
Variation.—-All the species of this group have but a restricted scope 
for variation ; in addition to the modifications of shape and size, the white 
basal coloration may extend over the whole of the shell, or on the contrary 
the shell be entirely more or less fawn-coloured. 
In very dry situations the shells are said by Macgillivray to be notice- 
ably thicker, firmer, and more opaque; while in the moister localities the 
shells are often of a yellowish-brown colour and so very thin as to be a 
mere film. After death, if exposed to the weather, the shells soon become 
of an opaque-white and very brittle. 
In the west and north there is apparently a larger but more ancient 
and weaker race of this species, which forms a still closer connecting link 
with Hyalinia lucida, from which it is often very difficult to separate it by 
external characters; the anatomy of these somewhat dubious forms. is, 
however, undoubtedly that of /7. ced/uria, and they may be referable to 
the var. compacta of Jeffreys. 
It is quite probable that the /7. eillw of Mortillet is also only a form of 
the present species, with which its radula closely coincides, and with which 
it has frequently been allocated. //. chersa, H. suncta, H. intermissa, 
and other forms have also been referred to HZ. cellaria by many authors. 
VARIATIONS IN SHELL. 
Var. compacta Jeffreys, Brit. Conch., 1862, 1., p. 160. 
Zonites cellarius var. conipacta Jeffreys, l.c. 
Zonites cellarius vy. stlvatica Morch, Syn. Moll. Dan., 1864. 
Zonites cellarius elevatus Van den Broeck, Ann. Soc. Mal. Belg., 1869, p. 87, pl. 2, f. 4. 
SHELL not so white underneath; whorls more convex; and spire more prominent. 
This variety, which according to Westerlund is identical 
with the var. si/vatica of Moérch, may be regarded as em- aces 
bracing the large convex cellaria, which by their deeper . ema 
colouring, convex spires, and large size, simulate H. lucida. 
Dr. Jeffreys himself regarded this variety as really including Fic. 69.—H. cellaria 
our H. lucida. It is evidently a transition form between é elevata Van den Broeck 
; J i : ; after Van den Broeck). 
H. lucida and H. cellaria, aving the internal structure of 
cellaria, but a superficial resemblance externally to the true /ucida, while its 
discontinuous northerly and westerly distribution in this country stamp this form 
as one of the weaker races which will be eventually exterminated. 
The sub-var. silvatiea differs in the aperture being surrounded by a thin 
whitish internal rib. Diam., 11-13 mill. ; alt., 5-6 mill. “ 
The sub-var. elevata is described as very convex above, with oblique but not 
compressed aperture. Diam. 13 mill. ; alt. 6 mill. 
ENGLAND AND WALES. 
Somerset S.—A somewhat flatter form, Dulverton, 1903 ! Hugh Watson. 
Isle of Wight—-Carisbrooke, July 1869 (Lecomte, Bull. Soe. Mal. Belg. , 1869, p. 61). 
Surrey—Box Hill, 1883, A. Loydell. Croydon (Kenneth MeKean, Proe. Croydon 
Nat. Hist. Club, 1883, p. 151). : 
Cambridge—Stapleford ! Hugh Watson. 
Gloucester W.—Strond, May 1885! E. J. Elliott. 
Worcester-—Hay Mills near Birmingham, 1870, W. Nelson. 
Warwick— Cellars, Digbeth, Birmingham, 1870! W. Nelson. 
Stafford—-Wren’s Nest, Dudley, 1870, W. Nelson. 
Salop—Porthynaen Quarries, Oswestry, 1866! W. Whitwell. 
Anglesey—Beaumaris, ‘‘ Rogers’ Collection,” F. H. Sikes. 
York S.W.-—Conisborough, June 1873, J. Wileoek. Elland, J. Whitwham. 
Lancashire S.—Abundant on the walls of a dark recess, heated by discharge of 
the condensing-water from the engines at the calico print works, Clayton-le-Moors, 
July 1889! R. Wieelesworth. 
Isle of Man—Peel ! W. Moss. 
Perth Mid—Perth (I*. Buchanan White, Scot. Nat., 1873, p. 162). 
Ebudes Mid —Isle of Tiree, Sept. 1886! Rev. J. E. Somerville. 
Hebrides—Very numerous in churchyard at Eye near Stornoway, Isle of Lewis, 
Sept. 1886 ! Alex. Somerville. 
SCOTLAND. 
