256 NATURAL HISTORY SOCIETY OF DUBLIN. 
no opening; they seem to be true closed cells, contained in the common 
sarcode body, just like the “ yellow cells’ of the marine Radiolaria. 
Nay, the creature seems to shed these or extrude them during the ex- 
ertion of incepting foreign matter of an extraordinary character or size, 
and this seemingly with complete nonchalance. See my second draw: 
ing of an example of this creature (Pl. VIII, fig. 2). Now, under all 
circumstances, these cells appear to be close all round, and, therefore, 
could not give off sarcode processes. In fact, so far as observation reaches 
in Cystophrys Haeckeliana they must be regarded as contained cells, 
possibly comparable, as I have said, to the “‘ yellow cells’ of the marine 
types; whereas in the animal now drawn attention to the outer wall 
must be regarded as simply a test, and this notwithstanding the ge- 
neral resemblance of the two. Further, the test in the form now 
brought forward is larger than the cells of Cystophrys Haeckeliana, nor 
do the pseudopodia of the latter ever seem to reach the inordinate 
length of those of the present form. Again, the great difference in the 
relative degree of activity or locomotive power of the two is sufficiently 
striking. As has been mentioned, the movements of the present form 
are exceedingly slow and torpid,} whilst in Cystophrys Haeckeliana the 
change of place and power of modifying the outward configuration of 
the general mass and of encompassing foreign bodies was very consi- 
derable, as was well evidenced by the example from which the second 
figure was taken (Pl. VIII., fig. 2). 
On the whole, then, I think this form presents itself to us as a new 
and distinct Rhizopod, one which fulfils the conditions which entitle it 
to admission into the genus Gromia (Duj.), but one which, as has been 
seen, offers some puzzling resemblances. I can, then, only hope that it 
may be met with elsewhere if searched for, and that thus the desirable 
observations of others who may work in this field may shed that light 
upon its development which the present imperfect remarks, I regret to 
say, fail to do, and that I may thus, perhaps, hope some day or other 
to have my views upon it confirmed, or, if ill-founded, to have them 
corrected. 
Diaphoropodon mobile, gen. et sp. nov. (PI. X., fig. 6.) 
I pass on to another novel form, and amongst those I have had the 
opportunity to bring forward, probably, if not the prettiest, at least one 
of the most curious—one, indeed, which I apprehend, in one respect at 
least, 1s unique amongst Rhizopoda. It is not, of course, without affi- 
nities and resemblances in other respects, and to some of those I would 
briefly refer, after first endeavouring to convey an idea of the present 
form. 
An inspection of the accompanying drawing (Pl. X., fig. 6) will 
assist in accomplishing that end. We have here to do with a rather 
large form, one of the largest, indeed, of encased freshwater forms with 
which I am acquainted, its rude test, if test it may be called, seemingly 
formed of heterogeneous foreign materials very loosely aggregated 
around the generally pretty regularly elliptic-shaped body. These 
