394 
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 Haechel- 
iana they must be regarded as contained cells, possibly com- 
parable, 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 not- 
withstanding the general resemblance of the two. Further, 
the test in the form now brought forward is larger than the 
cells of Cystophrys Haecheliana, 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 suffi- 
ciently striking. As has been mentioned, the movements of 
the present form are exceedingly slow and torpid, whilst in 
Cystophrys Haecheliana the change of place and power of 
modifying the outward configuration of the general mass and 
of encompassing foreign bodies was very considerable, as was 
well evidenced by the example from which the second figure 
was taken (PI. XVII, fig. 2). 
On the whole, then, I think this form presents itself to us 
as a new and distinct rhizopod, one which fulfils the condi- 
tions 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 observa- 
tions 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 thetp corrected. 
Diaphoropodon mobile , gen. et sp. nov. (PI. XX, 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, is unique amongst 
Rhizopoda. It is not, of course, without affinities and resem- 
blances 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 tire accompanying drawing (PL XX, 
fig. 6) will assist in accomplishing that end. TV e have 
here to do with a rather large form, one of the largest, indeed 
of encased freshwater forms with which I am acquainted, its 
