161 
taking the most typical forms of each, around which we group 
the others; but as all these divisions require illustrations to 
make their definitions clear, we must pass this part of the paper 
over, and refer to its text, which will be printed with the wood- 
cuts in our “ Proceedings.” 
Dr. Wricut having pointed out the genera by demonstrating 
a number of type examples which he had named for the occa- 
sion, and shown how distinct the groups are from each other 
when tested by the generic characters he had pointed out at 
the commencement of the paper, he said the change was not 
greater among the Ammonites than had been found necessary 
with the Trilobites, Brachiopods, and Hchinodermata, and other 
classes which had required revision and re-arrangement, in 
consequence of the discovery of so many new forms belonging 
respectively to them. The change proposed was one rendered 
necessary by the progress of Paleontology, and although it 
might meet with opposition for a time, the new names would 
replace the old ones, as had been the case among other groups 
which had undergone re-arrangement in modern times. 
THIRD WINTER MEETING. 
The third and last Meeting of the Club for the Winter 
season was held in the Lecture Theatre of the Science School, 
in Gloucester, on Wednesday, 17th March. 
Previous to the reading of papers, the company examined 
with much interest a fine collection of Arthropoda (Insects, 
Spiders, and Crustacea) arranged as an educational guide, 
which was liberally presented to the Gloucester Museum by 
Mr. Atten Harker. Mr. Harker explained the system of 
arrangement, and said that instead of exhibiting, as was too 
commonly done in museums, a collection of the most handsome 
and striking forms of Arthropods, he had endeavoured to give 
such a typical collection that the student of that branch of 
Zoology might find in it a key and a guide to the study of the 
whole group. He had illustrated the microscopic genera by 
enlarged drawings, and, where possible, had indicated habits or 
developmental peculiarities. 
