™ 
486 MONOGRAPH OF BRITISH LAND AND FRESHWATER MOLLUSCA. 
Helix hortensis Miiller (see p. 326). 
Geological Distribution.—In West Gloucestershire, it is recorded 
by Mr. H. Bolton from the Holocene deposits on Dumball Island. 
In Mid-west Yorkshire, Mr. J. Wilfrid Jackson has found specimens of 
tlis species quite common in a Neolithic hill-wash at Clapdale, Clapham. 
Variation.— When treating of this species in Part xvi. of the present 
work, I omitted any definite allocation of the Helix hybrida of Poiret 
from, amongst other reasons, the misleading name and the uncertainty of 
the true and precise character of the form. 
That the uncertainty is not confined to this country is demonstrated by 
Dr. L. Germain, who ina recent work describes the Helix hybrida of Poiret 
as variable in colour, but generally fawn coloured, with a violet, white, or 
flesh coloured lip, and assigns it to Helix nemoralis. 
[ have recently been fortunate in acquiring a copy of Poiret’s Coq. fluv. 
et terr., 1801, from which it 1s apparently clear that the Helix hybrida of 
that author (if correctly allocated to 7. hortensis) is referable to my var. 
“ilacitna and not to the rosy-lipped unicolorous variety—var. fusca—with 
which it has usually been associated. If placed with //. nemoralis, as 
suggested by Dr. Germain and others, it must be associated with the var. 
studeria Moq. ‘The description of Poiret is :— 
Helix hybrida.—SuELL globose, imperforate, semitransparent, of a delicate 
lilac colour, with one or many bands; MOUTH without stain ; LIP violet ; WHORLS 53. 
Diam. 16-18 mill. Inhabits large forests, Celle de Villers-Cotteréts, Aisne, Poiret, 
Coq. fluv. et terr., 1809, pp. 70, 71. 
Var. fusea Poiret, Coq. fluy. et terr., 1801, pp. 70-73. 
This name, which supersedes that of baudonia given by Moquin-Tandon, is also 
due to Poiret, and this form has hitherto also been overlooked or misunderstood. 
The var. hybrida has been in England almost invariably ascribed to shells un- 
doubtedly really referable to var. fusca. This form is described by its author as 
Helix fusea.—SuELL globose, imperforate, of a clear or dark fawn (faune noir); 
Lip distinet, brown or white, tinged with rose colour ; MOUTH unstained ; WHORLS 
43-5. Diam. 11-12 mill. 
Var. A. —Shell of a pale yellow, greenish, or tinged with rose colour. 
Var. B. —The same, with one to five brown spiral bands. 
The great forests, Celle de Villers-Cotteréts, Aisne. 
Var. lutea Picard, Moll. Somme, 1840 (see p. 344). 
Helix hortensis var. lutea-lurida Swanton, Moll. Somerset, 1912, p. 32. 
The sub-var. lutea-lurida of Swanton differs from that of Williams, being 
described as var. lutea blotched with faint lilac spots. 
ENGLAND. 
Somerset N.—Hedgebanks at Holbrook, near Wincanton, and on hilltops at 
Milton-Clevedon and Penselwood (Swanton, op. cit., p. 33). 
Var. fascialba Taylor, var. nov. (pl. xxviii.). 
The var. faseialba is characterized by the presence of a white and calcified 
supraperipheral zone, upon which the third band of the pentateeniate formula is 
placed. 
The specimen upon which this variety is based is of a slightly greenish-yellow 
colour, with the supra-peripheral white zone, and has the formula 00300. 
ENGLAND. 
Somerset N.—Blagdon near Bristol, Miss F. M. Hele (Darbishire Collection, 
Manchester Museum), 
