158 SOME NEW SECTIONS AT ILFORD
into River Gravel with shells in the upper part, and overlaid by
made ground. Several imperfect examples of Corbicula fluminalis
and Helix nemoralis were obtained from the sand, together with
an abnormal specimen of Helicella itala—a new record from
Ilford. The adjacent pit showed a similar section which did not
however, at that time, yield any shells, these being very
irregularly distributed throughout the deposit.
Since the above visit we have systematically collected from
these sections and have been rewarded with several finds of great
interest.
The following is a complete list of the Mollusca we have
obtained :—
Agriolimax agrestis, Linn
Vitrea crystallina, Müll.
V. nitida, Müll.
Arion ater, Linn.
Punctum pygmaeum, Drap.
Pyramidula rotundata, Müll.
Eulota fruticum, Müll.
Helicella itala, Linn. var.
,, caperata, Mont.
Vallonia pulchella, Müll.
Helix hortensis, Müll.
,, nemoralis, Linn.
Pupa muscorum, Linn.
Vertigo antivertigo, Drap.
Clausilia laminata, Mont.
C. bidentata, Strom.
Cochlicopa lubrica, Müll.
Carychium minimum, Müll.
Succinea elegans, Risso.
Ancylus fluviatilis, Müll.
Limnea pereger, Müll.
L. auricularia, Linn.
L. palustris, Müll.
L. truncatula, Müll.
Planorbis marginatus, Drap.
P. glaber, Jeffr.
P. spirorbis, Müll.
Valvata piscinalis, Müll
V. cristata, Müll.
Bithynia tentaculata, Linn.