141 
MICROSCOPICAL SECTION. 
November 18, 1861. 
E. W. Binney, F.R.S., F.G.S., in the Chair. 
Dr. Edward Stephens was elected a member of the Section. 
The Secretary read a communication from Mr. Thomas 
G. Hylands, of Warrington, “ On the Classification of the 
Diatomacem.” The Author desired to call attention to the 
want of systematic arrangement which characterises this 
favourite branch of microscopical investigation, and to the 
necessity of a thorough revision of the entire classification of 
the natural order. The author presented to the Section two 
slides to illustrate his arguments. The predominant form 
of frustules was first named by Dr. Brebisson Cocconeis lams. 
In 1857 it was published by Mr. Roper (M. I. vol. vi. p. 22) 
under the provisional name Coscinodiscus ? ovalis ; but 
in consequence of finding on the valves eight to twelve 
submarginal obtuse processes with tumid bases, quite distinct 
from the spines or teeth which occur in the Coscinodiscese, 
the Author considers this species must be placed in the genus 
Eupodiscus, and may fitly be called Eupodiscus loevis. The 
specimens were obtained at Llandudno, in ripples in the sand 
below mid- water ; and the Paper concludes with a description 
of some peculiarities connected with their sudden disap- 
pearance. 
Mr. John Watson read a paper “On certain Scales of 
some Diurnal Lepidoptera,” in which he recommends a new 
and careful study of this subject. In some genera peculiar 
