24 
with, the trypsin in the pancreatic juice of mammals. 
The calcium phosphate was probably used up in the 
making of the autumn epiphragm; and the glycogen 
combined with the intra-molecular oxygen in the muscle- 
tissues, producing a ‘‘ chemical explosion,” which resulted 
in the characteristic slow wave-like contraction of un- 
striated muscle in the Mollusca and in unstriated 
muscle generally. Mr. Basil W. Martin, F.Z.S., exhibited 
on behalf of Mr. J. E. Whiting, a Pied variety of the 
Common Blackbird (Zurdus morula, Linn.), and stated 
that it was recently found dead in Avenue Road, St. 
John’s Wood. 
Mr. C. S. Nicholson, F.L.S., read a paper entitled 
“‘ Local Variations in Plants,” and illustrated it with a 
number of specimens from his herbarium. 
Friday, 12th December, 1902. Sir Samuel Wilks, 
Bart., F.R.S., in the Chair. 
Mrs. Park exhibited a number of Jurassic Fossils, 
and read explanatory notes of the Jurassic formations. 
Mr. Hugh Findon, on behalf of Mr. George Dolman, 
showed Afptocrinites parkinsoni from the Bradford Clay. 
Mr. Frank Podmore, M.A., exhibited the impression of 
the foot of a Cretaceous Deinosaur (Iguanodon). Mr. 
K. I. Marks, F.R.M.S., read a paper on “ The Rotifera 
—their Haunts and Habits.” Mr. Marks’s paper was 
illustrated by drawings and living specimens under the 
microscope. Dr. J. W. Williams, F.L.S., made some 
remarks upon TJestacella haltotidea and T. scutulum, and 
described the anatomical distinctions between these two 
species, TZestacella scutulum, he said, was a common 
slug in North London, but very often overlooked 
because in its quiescent condition it resembled a pebble. 
eee 
