PROCEEDINGS OF SOCIETIES. 275 
‘turned out to be pollen of Pines, indeed that of, the Scotch Fir, 
which Dr. Moore verified by showing some pollen of that species 
side by side under another microscope ; nay, Dr. Moore had 
found that several of the grains at first thought to be sulphur, and 
then by some regarded as possible insect’s eggs, upon being 
moistened developed a pollen tube. 
Mr. Crowe exhibited a very minute Cosmarium from Bray 
Head, which was sufficiently puzzling, as it seemed to come 
exceedingly close to Cosmarium tuberculatum (Arch.), and yet not 
to be truly that form. The plant is very minute, segments 
broadly elliptic, constriction very obtuse and shallow, isthmus 
broad, surface smooth. 
Mr. Archer said this seemed, no doubt, a very puzzling little 
form; indeed, as much so as he had ever met. Leaving the 
minute tubercles and somewhat smaller size of C. tuberculatum 
out of view, the present plant seemed fairly to agree with that 
form. It is to be drawn attention to that the figure of C. 
tuberculatum (‘ Proceedings Nat. Hist. Soc. Dub.,’ vol. iii, pl. ii, 
figs. 11—15; also, ‘ Quart. Journ. Mic. Sci.,’ N. 8., vol. ii, pl. xii, 
figs. 11—15) gives these very minute tubercles as much too large 
and prominent and pellucid. They, on the other hand, are 
exceedingly minute and opaque. However decidedly Mr. Archer 
felt disposed to rely on the permanence of these forms, he would 
not insist too strongly in any case, without a much closer 
acquaintance with the forms in question than he had as yet been 
able to make. Tbe plant now shown by Mr. Crowe may indeed 
be but a variety of C. tuberculatwm, for the actual differences are 
but slight, but it may be premature to pronounce until these 
little forms are more frequently met, and any characters deducible 
from their zygospores discovered. But, be it as it may, Mr. 
Archer thought that this plant could be mistaken for no other 
than C. tuberculatum. Nor could either (@f they should indeed 
turn out distinct) be at all confounded with any other species. 
Mr. Porte exhibited some pupa cases of aphides, all of which 
had been inhabited by Ichneumons, leaving the well-known 
curious aperture by which these insects made their exit. 
Dr. E. Perceval Wright exhibited sections of the pitcher of 
Sarracenia purpurea and S. flavans, showing the peculiar arrange- 
ment of the cellular tissue of these strangely metamorphosed 
leaves, and especially the glands, which were found underneath 
the outside layer of the epidermis. He alluded to Vogl’s paper 
in ‘Sitzungsberichte der k. Akad. der Wissenschaften,’ Band 1, 
p- 281 
Dr. John Barker showed the (with us rather rare, and withal 
very elegant) Micrasterias Americana, Ehr., gathered on the 
occasion of the Glen-ma-lur excursion. 
