22 
(Belted Beauty), and Amphidasys betularia (Peppered 
Moth). Mr. Hugh Findon exhibited and make some 
remarks upon a collection of Ammonites. Mr. Basil 
W. Martin, F.Z.S., made remarks upon Prjevalsky’s 
Horse (Eguus prjevalskit) which had lately arrived in 
the Zoological Society’s Gardens and pointed out that it 
was a true horse and in all probability the descendant of 
the original stock from which the horse of domesticity 
had been derived. 
Friday, 11th April, 1902. Sir Samuel Wilks, Bart., 
M.D., F.R.S., in the Chair. 
Dr. J. W. Williams, F.L.S., exhibited under the 
microscope and otherwise, specimens of the fresh-water 
sponge (Zphydatza fluviatilis) and opened a discussion 
on its structure and affinities. Specimens of Phzlodina 
voseola (Ehr.), a ‘‘revivified rotifer,” were shown by Mr. 
K. I. Marks, F.R.M.S. Mr. Basil W. Martin, F.Z.S., 
exhibited on behalf of Mr. J. E. Whiting, a case of the 
Indian Leaf Butterfly (Kalima huttonz), illustrating pro- 
tective resemblance. Mr. Montagu F. Hopson, F.E.S., 
exhibited specimens of Clear-wing Moths, which super 
ficially resemble wasps, hornets or bees, and are examples 
of a form of mimicry. Mr. Hugh Findon read a paper 
entitled ‘‘The Approximation of the Forms of Living 
Mollusca to their Fossil Prototypes.” Mr. Findon illus- 
trated his subject with a number of recent shells, together 
with their fossil forms, and showed very clearly how the 
types persist through the different deposits to the present 
day. Dr. J. W. Williams exhibited under the micro- 
scope a L.S. through the eye of Pecten opercularis, as 
an example of a molluscan eye. 
Friday, 9th May, 1902. Sir Samuel Wilks, Bart., 
F.R.S., in the Chair. 
Mr. K. I. Marks, F.R.M.S., exhibited Pvrotococcus 
pluvialis (Br.), and read a short paper upon this and 
