PLEISTOCENE GEOLOGY OF THE THAMES VALLEY. 355
Helix nemoralis, Linn. Two imperfect examples and
numerous fragments.
Helicella virgata, Da Cost. Four examples. The
occurrence of this species is of great interest, as hitherto it is
only represented from the Pleistocene of the Thames Valley by
a single example found at Ilford by Dr. Frank Corner, and now
in the Natural History Museum. Elsewhere it was common at
Barnwell, and it has been found in several rainwashes of uncer-
tain age, probably very modern, if not post-Roman.
Helicella itala, Linn. Not found by us, but a single
example was found by W. J. Lewis Abbott, F.G.S., in the pit
belonging to the Tunnel Cement Works Company. It differs
markedly from typical examples of this species, but it can only
be considered a variety. Several examples of this variety have
lately been obtained from Ilford by J. P. Johnson and G. White
(see Essex Nat., vol. xi., p. 159).
Helicella caperata, Mont. Three examples of this
abundant Pleistocene shell.
Cochlicopa lubrica, Müll. One perfect and two broken
specimens.
Pupa muscorum, Linn. Not common. This is note-
worthy as it is usually one of the most abundant land shells in
Pleistocene deposits.
Vertigo antivertigo, Drap. Five examples. This species
was recorded by S. V. Wood, but hitherto no examples were
known.
Vertigo substriata, Jeff. Recorded by A, Tylor on the
authority of A. Bell.
Vertigo pusilla, Müll. Recorded by S. V. Wood.
Clausilia laminata. Mont. Several fragments. It has
hitherto been unrecorded from Grays. It is known from the
Pleistocene of Ilford, Clacton, Copford and Ightham, whilst
it is abundant in many Holocene beds.
Clausilia biplicata, Mont. Several imperfect examples.
Though originally listed by S. V. Wood this record has hitherto
been rejected since the species was unknown in a fossil state
in this country (there being no examples of it in the Wood