412 PROCEEDINGS OF SOCIETIES. 
bast-prosenchyma were visible both in the new phloem as well as 
in that of the first year. The cortical tissues, with the remark- 
able trumpet-like openings of the medullary rays, were very 
conspicuous. 
Structure of Leaves of Selaginella.— Mr. Pim showed two pre- 
parations of leaves of Selaginella (Selaginella Kraussiana and 
S. Poulteri), presenting the peculiar epidermal structure. The 
stomata, which are much smaller than in most Phanerogamia, 
are found only on the lower surface, and are disposed in three or 
more rows, in the immediate neighbourhood of the midrib. The 
epidermal cells on the upper surface are small and nearly circular, 
while those of the lower surface are large, irregularly trapeziform 
with waved margins. The leaves were bleached with the nitric 
acid solution described on a previous occasion, stained with 
cearmine and Judson’s blue, and mounted in Deane’s gelatine. 
Mr. Pim had found the same general arrangement in all the 
species of Selaginella he had examined, the chief variations being 
the shape and size of the epidermal cells of the under side, and 
the number of rows of stomata. 
Spermatozoids of Volvox globator, exhibited.—Mr. Archer ex- 
hibited the spermatic condition of Volvox globator, showing the 
little tabular bundles of collaterally combined elongate sper- 
matozoids, at first enclosed in a globular envelope ; in the examples 
shown a considerable number of the peripheral cells had remained 
unaltered, whilst in others nearly the whole had become changed 
into the groups of spermatozoids ; other examples showed the 
resting-cells, preparatory to assuming the golden hue. 
Cosmarium cyclicum, Lundell, new to Lreland.—Mr. Archer, 
though the evening was late, still, as the example was perishable, 
further showed the only specimen he had ever seen or taken 
of Cosmarium cyclicum, Lundell. This example was from Callary, 
from a small pool all but dried up, which, however, had never been 
very good for Desmidiee (but a noted site for the rotatorian, 
Conochilus Volvoz). It was quite in accord with Lundell’s 
lower figure (‘ De Desmidiaceis,’ t. ITT, f. 6 d), and the form must 
be, he thought, quite distinct from the so-called variety of this 
species of Nordstedt, “ Desmidiaceze ex Insulis Spetsberger- 
sibus, ete., collecte ” (in ‘ Ofversigt af Kongl. Veteskaps Akade- 
miens Férhandlingar,’ Stockholm, 1872), and even more so from 
the further “ variety” of Reinsch, “ Contributiones ad Algologiam 
et Fungologiam,” p. 89, t. x, f. 10, 1875. 
27th May, 1875. 
On Chytridie in the Floridiee.—Dr. E. Perceval Wright 
called the attention of the Club to the subject of the presence of 
Chytridiesw attacking certain Floridiee. Magnus had very 
recently described a new species as met with in the young cells 
of Ceramium flabelligerum, near Edinburgh, and suggests that, in 
the red Algw, these parasites have often been passed over as 
