244 NATURAL HISTORY SOCIETY OF DUBLIN. 
central cells of our Rhizopod be so far comparable with the yellow cells 
of the marine Radiolaria, it could not possibly be admitted into that 
great group at all, owing to the total want of a ‘‘ central capsule’— 
this latter being a part of the organization of the Radiolaria of Haeckel 
which is common to every member of the whole of that marvellously 
beautiful class. 
If, indeed, our animal had a central capsule, it would seem easy to 
show a relation to such marine forms without skeleton of any kind, as 
Thalassicolla and Thalassolampe, or Collozoum; but being destitute of 
that organ, it must remain by the side of Actinophrys, Raphidiophrys, 
Clathrulina, Acanthocystis, and other less allied freshwater Rhizopoda, 
until, perhaps, a greater number of types become known, or until more 
is made out of the development of these humble existences, and a light be 
thus shed upon their real affinities. It will be seen, however, that upon a 
comparison and contrast with its seemingly nearest allies, it offers 
characters showing affinities in various directions, but at the same time 
forbidding its finding a place, so far as I am aware, in any known 
enus. 
As regards the ‘‘ yellow cells,’ Haeckel suggests that they may 
have something to say to the function of digestion. I am at least 
strongly inclined to suppose that in the present form the central cells. 
must subserve rather to reproduction. But on this point I am without 
any but too cursory observations to be worthy of record. Let us, 
however, hope that this animal may turn up on some other occasion— 
perhaps at the same season next year—although, as will appear, it is 
readily overlooked; but I should not be without hope of refinding it, 
as I met with it in several gatherings in Callery, and in one from near 
Carrig Mountain, though, on the other hand, a more recent gathering 
from one of these localities did not reveal it. 
I now refer to the second form, Cystophrys oculea (n.s.), which, 
provisionally at least, I would associate with the foregoing; I have 
tried to reproduce it in fig. 3. It will be seen that, whilst it agrees in 
having a number of central cells, it differs in the character of the pseu- 
dopodia, which here are fine, linear, directed in various ways, and do 
not branch or inosculate; and this is the principal reason why I imagine 
that it is possible they should not fall under one and the same genus ; 
for I think the nature of the pseudopodia is, generally speaking, very 
characteristic in these forms. Again, I have not satisfied myself that 
the cell-like structures occupying the mass of the body are really cells— 
that is, I have not seen that they possess a special wall, though the 
bright spot in each, with its central black dot, may, most probably, be 
regarded as nucleus and nucleolus, and homologous with the white 
space and darkish dot in centre of the cells of last form. These bodies 
in the present are of that bluish hue and granular appearance prevalent 
in such forms. The central nucleus, so to call it, is of a circular or 
broadly elliptic outline, and is bounded by a distinct, sharp, black 
line; its colour seems to vary, and this, with the kind of illu- 
mination and with the state of the focus of the microscope, from a 
