THE ESSEX NATURALIST
ACKNOWLEDGMENTS
Especially to Prof. P. W. Shotton for stimulating interest
in Pleistocene geology, and to Prof. P. E. Zeuner for answer-
ing many questions about the deposits. It is only due to the
astute observation of Mr. Noel Morris that this site was
recognized before its final loss to geology. Above all, to the
late Mr. A. G. Davis, Mr. M. P. Kerney and Dr. A. J.
Sutcliffe for their constant help and advice, both in the field
and with their expert identifications. Mr. M. P. Kerney read
through the MS. of this paper and made many helpful sugges-
tions, most of which have been since adopted. Finally, to
the Clerk of the Works, Surveyor and workmen of Ilford
Borough Council, for permission to work on the site and for
supplying data giving altitudes of the concrete floor of the
trench, from which accurate measurements could be made.
Part of the molluscan fauna is now deposited at the British
Museum (Natural History); the mammalian remains in the
Museum of Birmingham University Geological Department.
APPENDIX ON THE NON-MARINE MOLLUSCA
By M. P. KERNEY and the late A. G. DAVIS
T
he following Mollusca were obtained by the writers in
September, 1956, from the "Corbicula sand" horizon,

between Sections I and II of the Gordon Road excavations.
Shells, which apart from Corbicula were not common, appeared
to be restricted to this horizon; none were observed in the
coarser deposits above or below, or in the brickearth.
Valvata piscinalis (Muller) 1
Belgrandia marginata (Michaud) 2
Bithynia tentaculata (Muller) 8
Lymnaea truncatula (Muller) 2
,, palustris (Muller) 1
Planorbis (Planorbis) sp. indet. 1
*Arianta arbustorum (Linne) 2 fragments
*Land Species.