GrevillEj on Aster olanijwce. 
41 
the instrument is certainly far superior to the ordinar}' micro- 
scopes of that time, both in its optical qualities and in the 
apparatus attached to it for the examination of objects. It 
is obviously not suited for the purposes to which the micro- 
scope is applied in the present day; still it was undoubtedly 
considered as a very superior, pleasing, and convenient in- 
strument at the time it was constructed. The workmanship, 
also, is of the very best description ; and although it must now 
be looked upon rather as a curiosity than as a useful instru- 
ment, the Society may be congratulated on having acquired so 
remarkable and characteristic a microscope of the olden time. 
Before I conclude I must call your attention to two other 
old microscopes, purchased at the same sale for the Society. 
They were made by Culpepper, a well-known optician, who 
flourished, I believe, a little earlier than Martin, but of whom 
I have as yet been unable to find any account. The first is 
an early form of the compound microscope, which long 
kept its standing imder the name of " Culpepper's Micro- 
scope,^^ and whose pyramidal box must be familiar to all of 
us. The second is a fine specimen of ^^Wilson^s Pocket 
Microscrope,^^ mounted in silver, with extra apparatus, by 
which it may readily be converted into a compound micro- 
scope, and fixed upon a stand, with a reflecting mirror, if 
required. They are both curious and characteristic specimens, 
and well worthy of a place in the collections of this Society. 
On the AsTEROLAMPR^ of the Baubadoes Deposit. 
By K. K. GuEviLLE, LLD., F.H.S.E., &c. 
Soon after the publication of my monograph of the genus 
Asterolampra, nearly two years ago, my attention was directed 
to certain discoid forms occurring in the celebrated deposit of 
Polycistinece and Diatomace(s, in the island of Barbadoes. At 
the same time my friend, Mr. T. G. Bylands, sent for my 
inspection a disc, which he had discovered in deep-sea sound- 
ings fromx the Atlantic. In the course of the same year 
(1860), Mr. Brightwell published, under the names of 
Craspedodiscus marginatus and semiplanus Mic. Journ.,-* 
vol. viii, p. 95), two diatoms from the Barbadoes deposit. 
All these, upon a careful examination, proved to belong 
to the same group, having a hyaline area, traversed by 
radiating umbilical lines, each of which terminated at the 
