156 THE ESSEX FIELD CLUB.
Mr. W. Cole exhibited some examples of a series of species of butterflies
which were intended to be placed in the Museum to illustrate the theory of
Mimicry amongst insects.
He also exhibited some specimens of the curious mollusc, Petricola
pholadiformis, which had been presented by Mr. J. E. Cooper and Mr. A. S.
Kennard. Mr. Cole and Mr. Kennard made some remarks upon the species,
which are embodied in a "Museum Note" in the present part of the Essex
Naturalist.
Dr. Thresh read a paper by Miss May Thresh on "Manganiferous
Nodules in the Boulder-clay of Essex." This paper is printed in the present
part, ante p. 137.
Mr. T. S. Dymond, F.I.C, made some extended remarks upon this
paper which are printed ante p. 139, and a short discussion upon it was carried
on by Mr. Dalton, F.G.S., Mr. D. Howard, F.C.S , and Mr. J. W. Salter.
The Secretary said that he had received some little time back a paper by
Mr. J. P. Johnson on a Manganiferous Deposit in the Thames Valley Drift at
Ilford, which was already in print, and which would appear at the same time
as Miss Thresh's paper (ante pp. 135-6).
On the proposal of the President, who remarked that the paper was a
most interesting piece of work, a cordial vote of thanks was passed to Miss
Thresh.
Mr. Martin Hinton read a paper prepared by himself and Mr. A. S.
Kennard entitled "Contributions to the Pleistocene Geology of the Thames
Valley. I. The Grays Thurrock area, Part II.," being the continuation of the
paper already published in the Essex Naturalist, Vol xi., pp. 336-370.
A discussion on the paper took place, carried on by Mr. T. V. Holmes,
F.G.S., Mr. Dalton, F.G.S., Mr. Rudler, F.G.S., Mr. J. W. Salter, F.G.S.,
and the President. Mr Hinton replied, and the authors were unanimously
thanked for their communication.
In the absence of the author, Mr. C D. Soar, F.R.M.S., Mr. Scourfield
read a paper on "The Water-Mites (Hydrachnidae) of Epping Forest."
The paper was illustrated by many beautiful coloured drawings, done
from nature by Mr. Soar, and Mr. Scourfield exhibited some specimens of
Water-Mites under the microscope.
Both Mr. Soar and Mr. Scourfield were thanked for the paper, and the
meeting ended.