178 PROCEEDINGS OF SOCIETIES. 
Mr. Archer would venture to propose the name Difflugia cari- 
nata. 
Passing on to other types, Mr. Archer was happy at being able 
to show two distinct but related forms, which time did not permit 
to bring forward at last meeting, and which so far as he could make 
out seemed referable to the genus Pseudodifilugia (Schlumberger) 
(‘Annales des Sciences Naturelles,’ 3 sér., tome iii, p. 256). 
This genus seems to form a very distinct type, and to judge from 
his paper alluded to, not apparently met with by Dr. Wallich. 
These seem to be rhizopods with Radiolarian (Carpenter) pseudo- 
podia and with tests apparently comparable to those of Difilugia. 
These he would not here delay by. dilating upon, but hoped to give 
an idea of them by figure on another occasion. 
The new form was very distinct indeed from any of the fore- 
going, and, perhaps, might be regarded, along with Acanthocystis 
turfacea (Carter), as possessing more affinity with certain marine 
forms than any other hitherto recorded as being found in fresh 
water. 
Before, however, passing on to mention and to show a specimen 
of this new form, Mr. Archer took occasion to exhibit examples 
of the species just ‘alluded to, Acanthocystis turfacea (Carter), 
never before, as identified, exhibited in Ireland. He also showed 
Carter’s figure (‘ Annals of Natural History, 3rd ser., vol. xiii, 
p. 36, pl. II, fig. 25, and 3rd ser., vol. xii, p. 262). This is an 
organism not very rare with us in suitable localities, but never, 
seemingly, plentiful. It is rare to get a good view of the very 
long and slender pseudopods ; but there can be no doubt of the 
general correctness of Carter’s description. The spicnles, however, 
are described by Carter as crescentiform—they seem rather to be 
short bacillar, and to be held together by some common bond, 
flatly arranged in one stratum round the periphery ; and thus held 
together the whole acquires the character, more or less, of an inte- 
gument of some tenacity, projected from which are the peculiar 
shaped spines, and through which emanate the filiform pseudo- 
podia.—So far as one could venture to judge, Carter seems to be 
quite right in supposing Acanthocystis to be quite another thing 
from Actinophrys brevichirris (Perty). 
To pass on to the new form Mr. Archer desired to exhibit, 
this might be most briefly defined by saying it represented an 
Actinophrys plus spicula. The sarcode body possessed, immersed 
and entangled in the outer region, beyond all computation densely 
numerous, very slender, elongate, pellucid spicules, acute at both 
ends, and lying in every possible direction. In the central por- 
tion of the body were contained one or several hollow globular 
clusters of somewhat large rounded chlorophyll granules; the 
pseudopods numerous, exceedingly slender, very long, and fine. 
As this remarkable form would require a figure to convey a just 
idea of its character, Mr. Archer would here refrain from any 
further attempt at description for the present. Should, how- 
