90 PROCEEDINGS OF SOCIETIES. 
lated to it are Chytridiwm cornutum (Al. Braun) and C. trans- 
versum (A. Br.); but the projections or lobes of the former 
species are numerous, narrower, and quite irregularly disposed 
and variable in size and form, the general form of the cell itself 
being globular—not, as in the present species, the lobes in one 
plane and equal in size, and three or four only, and the general 
form of the cell itself being depressed; and in the latter species 
the minute projections are two, and opposite and minute—not 
four, and in the same plane and large. In the present form there 
is no rounded body, the sides in top view are concave, and the 
whole cell is constituted by the lobes. But the present form is 
also distinguished from the species mentioned (and, so far as Mr. 
Archer was aware, every other species also) by the possession of 
the curious vertical, slender, hyaline process, with the minute 
knob at the apex, starting from the centre of the somewhat con- 
cave upper surface of the cell. What the nature of this curious 
appendage may be it would be hard to guess. The minute knob- 
like head, like the stem or process on which it is borne, is hyaline. 
Occasionally a free globose body, similar in size and appearance 
to this knob or head, was to be seen close beside it, leading to 
the idea that it might be detached and renewed. The zoospores 
make their exit from the opened ends of the radiating lobes, and 
their motion, like that of those of most of these forms, seems but 
faint and short-lasting. The cell-contents of the jomt of the 
Zygnema, on which these Chytridia were established, were always 
effete and brown-coloured, and destroyed. As has been remarked, 
it was mostly the shortest joints of the Zygnema which were so 
attacked by this parasite, but occasionally a long one was so, and 
on one occasion five or six were noticed on one very long joint. 
Occasionally the attachment and root-like appendages of the 
Chytridium could be seen penetrating into the Zygnema-cell, but 
more frequently, on a lateral view, the parasite seemed to be 
seated merely superficially thereon, and without any apparent 
means of attachment, as happens in other forms of Chytridium. 
It might seem, possibly, that after the Chytridium had become 
fully grown the root-like appendages might become resorbed. 
Mr. Archer ventured to think that this little plant, the most 
marked in figure of any of the genus, might not be without 
some interest, in case it may be detected elsewhere by other 
observers. 
QueEKett MicroscopicaL Crus. 
University College, London. 
September 28th.—W. Hislop, Esq., Vice-President, in the chair. 
Eight members were elected, and several donations were an- 
nounced. 
