PROCEEDINGS OF SOCIETIES, 89 
lines, which, though they furrow them, do not sink so deeply as 
to give a moniliform character to the strie. 
Dr. M. H. Collis exhibited Vorticella, beautifully showing the 
process of gemmation in various stages, from the first faint indi- 
cation of a commencing protuberance, the young gemma, up to 
the fully formed animal ready to become disengaged from the 
parent. 
Dr. John Barker showed a Carchesium, forming a beautiful 
object; but he drew attention to it chiefly to point out a curious, 
seemingly parasitic, filamentous growth, fringing the stipes of the 
animal, and often forming a more or less dense, ruffle-like, annular 
tuft round the stipes, just under the animal. These little fibres 
were exceedingly delicate and colourless, and Dr. Barker would 
regard them as fungoid. 
Mr. Archer ventured to think these delicate filaments might 
fall under some of Kiitzing’s more slender forms of Leptothrix, 
and they seemed to him, at least, although the habitat was seemingly 
novel, to be the same thing as the minute filaments or delicate 
fibres one sees more or less frequently attached to diatoms and 
other yarious objects in the water. 
Mr. A. Andrews exhibited some beautiful slides of crystals of 
sulphate of copper, made by Mr. Davis, similar to those figured 
and described by him in the ‘ Quart. Journ. Mic. Science,’ N. §., 
No. XIX, July, 1865, p. 210. These formed magnificent objects 
when viewed with polarized light. 
Mr. Archer brought forward a curious form of Chytridium 
(A. Br.), which he believed to be new. He had found it living 
upon the joints of Zygnema, and it was seemingly remarkable that 
it nearly always attacked the shortest joints. The gathering had 
been made by him in Callery Bog. As the form was first noticed 
in the company of Dr. J. Barker, and, indeed, was first drawn 
attention to by him, he would venture to take the opportunity to 
name this very distinct form after that gentleman. 
The following may serve as a description : 
Genus, Chytridium (Al. Braun). 
Chytridium Barkerianum, sp. noy.— Cells much depressed, 
three- or four-lobed, the lobes broadly rounded ; upper surface of 
the cell concave, bearing at the centre a vertical, hyaline, very 
slender, terate, minutely capitate process; the cell-contents 
mainly confined to the centre, leaving the ends of the lobes 
empty ; zoospores making their exit through the opened apices of 
the lobes. 
As regards the affinities and differences of this curious little 
species, it would seem that the only forms at all immediately re- 
