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PROCEEDINGS OF SOCIETIES. 
Dustin Microscorprcat Crive. 
18th April, 1867. 
Mr. Crowe showed some hairs from the nest of the larva of a 
species of Oiketicus, from Australia. These hairs, of which the 
felt-like wall of the nest, some inches in length, was constructed, 
formed a curious object. They were cylindrical, general form 
clavate towards the extremity, but armed there by a number of 
thorn or spine-like prolongations, pointing towards the ex- 
tremity of the hair. 
Dr. Collis exhibited crystals of cholesterine and epithelial 
scales from an encysted tumour; also sections of cancer-tissue, 
stained with carmine, and explained the process. 
Mr. Archer exhibited fine conjugated examples of Olosteriwm 
rostratum, showing the well-known characteristic form of this 
pretty zygospore. 
Rey. E. O’Meara showed several new diatoms from the Arran 
gathering—one the type of a new genus, named Wrightia, after 
Dr. E. Perceval Wright. Full descriptions, accompanied by Mr. 
O’ Meara’s drawings of the form, will appear in this Journal. 
Dr. Reynolds showed, under the polariscope, some crystals of 
Santonine, forming a very fine and gorgeous object. 
Mr. Dawson exhibited some remarkably fine and vigorous spe- 
cimens of Bacillaria paradoxa; these were in full and active 
movement, and the ever fitful changes of position of the frustules 
were well shown. 
Mr. Archer showed two forms of freshwater Radiolarian Rhi- 
zopoda, both seemingly new and noteworthy. One of these apper- 
tained to Actinophrys; it was remarkable, owing to a peculiar 
differentiation of the body into two sharply marked distinct 
strata, differently characterised in colour and structure. Though 
a greatly more minute animal, this differentiation is still more 
marked than that shown by Actinophrys Eichhornit.—The other 
form might be compared to an Actinophrys enclosed within a per- 
forated hollow globe, and emitting its pseudopodia through the 
apertures, but it really seems to possess a greater affinity with 
certain marine forms, and, leaving out of view the want of the “ yel- 
low cells,” to find its nearest allies amongst the Ethmospherida, 
close to Heliosphera. As a figure of these forms would, however, 
convey an idea of their nature far more readily than a hasty 
description, Mr. Archer would defer any more extended allusion 
to them till another opportunity.—He was able again to exhibit 
examples of the curious form he lately brought forward under 
the name of Raphidiophrys viridis (Minutes of 20th Dec., 1866) ; 
