94 On the hand and Fresh-water Mollusca
Z. alliarius, Miller.—Very common under fallen timber in
woods.
Z. glabra, Studer (Z. alliarius, Miller).—In similar spots
to the last species. Not rare.
Z. nitidulus, Drap.—Everywhere in moss, damp herbage
and dead leaves. I also find it commonly in the loose soil
under leaves in woods.
Z. purus, Ald.—The like localities produce also this
species, but not so commonly as the last, and I never find the
shells so nearly white as some I have had sent me.
Z. radiatulus, Ald.—I find this species and other small
shells by sifting the leaves and rubbish from the damp places
of our woods, in a brisk current of wind. By repeating the
process again and again, I have at last but a small quantity
of rubbish to spread on white paper and search over, and I
find this species to be not nearly so rare as is generally supposed.
Z. nitidus, Mull.—Rare, but easily distinguished by the
dark colour of the snail when living. Found occasionally
under moss and damp herbage.
Z. crystallinus, Mull.—Frequent in wet moss and under
dead leaves in all suitable places. Found by searching and
winnowing as above described.
Z. fulvus, Mull.—Very common under leaves in woods.
Suitable damp spots seem equally productive of this genus
in this district, whether the soil be clay, gravel or sand. I
have not therefore stated the soil on which I have found
individual species.
Helix aculeata, Mull.—Very rare. I did not think it
occurred until I adopted the winnowing process.
H. aspersa, Mull.—Extremely abundant everywhere. I
cannot recognize any of Jeffreys' varieties, but in Trinity
Churchyard, opposite my house in the centre of this town,
we often find an albino aberration.
H. nemoralis, Linn., and H. hortensis, Mull.--Both very
common, and as they are usually considered to be simply
varieties I give them together, but I generally find where one
is abundant the other is scarce, and I very much question
whether they are not distinct species.