PROCEEDINGS OF SOCIETIES. 177 
might be premature to say that in that genus it should find its 
place, inasmuch as Kiitzing has not given any details as to the 
mode of growth in any of the four plants he describes (‘Species 
Algarum,’ p. 162). May this plant possibly be Zrochiscia mul- 
tangularis (Kiitz.), l.c.? A thought strikes one here—might it be 
just possible that Kiitzing, in describing some of his forms, may 
have had some partially or fully developed zygospore of some 
Desmidian before him? The plant now exhibited was, at least, 
no zygospore, as its mode of growth, if not its form, wholly pre- 
cludes. 
Dr. Ryan showed the pollen of Monstera deliciosa, forming a 
pretty object under refiected light. 
Dr. Moore gave some particulars of the plant itself, referring to 
its leaves with natural apertures and its edible fruit. 
Mr. Archer, in continuation of the exhibition by him at the 
previous meeting, brought forward some additional rhizopodous 
forms, some not before recorded, he believed, in this country, 
as well as an additional one, which he thought must'be considered 
the type of a new genus amongst Radiolarian species. 
Amongst the described Lobosa probably one sufficiently note- 
worthy, though, perhaps, not uncommon, was Difflugia tuberculata. 
Amongst seemingly undescribed Lobosa was a form, in cha- 
racter of test, most nearly related to Difflugia triangulata (Lang), 
but of quite a distinct figure. As in that species there were no 
foreign adherent particles whatever, and the pellucid test showed 
similar markings, but smaller, comparable to “ broken ashler- 
work in building.” This seems to be a kind of test to which 
Dr. Wallich, in his very interesting, though Mr. Archer ventured 
to think not conclusive paper, does not allude. All his forms of 
Difflugia (setting aside ofcourse Arcella, which he would include 
in the same genus) are more or less coated by foreign particles. 
Nor does he allude to the peculiar reticulated markings com- 
parable to ‘“ broken ashler-work” on any more or less denuded 
specimens. Hence this character of test, it may be presumed, must 
be rare, or at least local, as his collections were made so largely and 
from so very wide sources. 
This new form differs from Diffiugia triangulata in not being at 
all triangular or lobed, but in broad view regularly balloon-shaped 
or pyriform, slightly drawn out into a somewhat wide neck-like 
extension and compressed ; round a lateral line or centre of the 
narrow side projects a more or less broad eel, which thus forms a 
border when the broader view is towards the observer; this keel 
bears just the same markings as the rest of the test. The whole 
is thus not unlike the form of a pocket-flask, with a wide neck, 
plus the keel. This keel is not continued on to the aperture, which 
is round and smooth and without a lip, but it usually becomes 
narrowed off where the gradually sloped off body becomes con- 
tracted into the sub-cylindrical neck-like portion. For this form 
VOL. VII.—NEW SER. M 
