of the District around Colchester. 95
H. arbustorum, Linn.—Not rare, but very local.
H. cantiana, Mont.—Very common, especially on the gravel.
H. concinna, Jeffr.—Abundant on the Roman wall and
elsewhere, in suitable spots throughout the district.
H. hispida, Linn.—Common.
H. virgata, Da Costa.—Abundant on the coast at Walton
and Clacton, on the cliffs of London Clay. Found also
inland, 011 gravel and sandy soils, but local. At Paglesham
near Rochford, on clay, (but this is beyond my district), I
have seen the vegetation absolutely swarming with this
species and H. caperata. It is there very large, and many of
these large shells have scarcely any markings.
H. caperata, Mont.—Common, but local.
. H. ericetorum, Mull.—I have never found this species
except by the side of the brook at Marks Tey, where the
subsoil is boulder clay.
H. rotundata, Mull.—Abundant in woods under fallen
timber, bark, leaves, &c.
Var. alba.—Eare.
H. pulchella, Mull.—Not rare in damp spots in pasture
in all parts of the district.
Var. costata.—I find this form on the Roman wall sur-
rounding the town.
H. lapicida, Linn.—I have no doubt this snail occurs in
the district, as I once found a dead shell at Layer de la Hay,
and I know it occurs at Wiston, on the Suffolk side of the
Stour, on a sandy subsoil.
Bulimus obscurus, Mull.—Rare. I find an occasional
shell in the hedges.
Pupa umbilicata, Drap.—Frequent on the Roman wall and
on Colchester Castle, and very rarely on trees.
P. marginata, Drap.—About as common as the last on the
castle and wall; rare elsewhere according to my experience,
but the Rev. Revett Sheppard says it occurs in profusion near
Wrabness Point, in the Stour estuary, a situation which at
high tides is covered with water.
The above two forms are the only species of the genus
Pupa that I have been able to find or hear of as occurring in