258 NATURAL HISTORY SOCIETY OF DUBLIN. 
sarcode body, except the anterior prominence, there are given off 
exceedingly numerous, very short, linear, hyaline, unbranched pseudo- 
podial processes, of but slightly varying lengths, which protrude through 
the loosely connected outer covering, and there, when seen marginally, 
looking like a dense fringe, bordering the body all round. Here, then, 
we have a Rhizopod presenting the seemingly remarkable character of 
one and the same sarcode body giving off its processes of two distinct 
forms or kinds—one often long, copiously branched, and very transitory, 
and fitfully changeable—the other short, unbranched, and so compa- 
ratively rigid as to give the appearance of a persistent hyaline marginal 
fringe; the first kind confined to one end, which I have called the an- 
terior end of the Rhizopod—the second kind evenly and densely dis- 
tributed everywhere else. 
T am not aware, then, that the circumstance just alluded to has a 
parallel amongst Rhizopoda, and hence I cannot but think such a form 
demands a distinct genus for its reception. It is true that I myself 
have drawn attention in a previous part of this paper (ante, p. 246) to 
two congeneric forms, themselves forming the type of a new genus, 
Heterophrys, and otherwise, indeed, considerably removed from our 
form, but which present sarcode processes of two distinct kinds; but 
each of these emanate from a differentiated part of the sarcode body, 
one enclosed within the other, and are not, as here, given off from one 
and the same body, seemingly without any differentiation, if I might 
so express it, of its body structure. 
But amongst Rhizopoda provided with a test, and not of the radiate 
(heliozoan or radiolarian) type, our form presents what appears to me 
to be still another speciality. That such a form should present an in- 
ternal contractile vacuole would not be unusual, but that it (in some 
of the specimens, at least) should offer a marginal pulsating vacuole, 
similar to that of an Actinophrys, seems to me to be noteworthy. 
Such, at least, so far as I am aware, has not been seen in Difflugia or 
Gromia, for instance, from both of which, indeed, our form upon other 
characters is sufficiently and distinctly removed. Perhaps, however, I 
err in ascribing any particular importance to such an organization in 
our form, but, at least, such is one of its characters. In the drawing 
(Pl. X., fig. 6) I have tried to depict the pulsating vacuole at its 
extreme point of distention just before its discharge and collapse in that 
wrinkled and contracted manner with which every one who has seen 
the same phenomenon in Actinophrys or in Actinospherium must be 
familiar. 
The body mass of our form is rather densely granular, and thereby 
rendered very opaque. Immersed in the substance ean be seen, 
without much trouble, however, a large and globular body, the so-called 
nucleus. With a little pains this can be pressed out intact, and is seen 
to be of that granular character and somewhat bluish hue of the similar 
body in an Amoeba, the body substance bearing opaque, somewhat 
coarse, and crude-looking granules. 
Having thus endeavoured to convey an idea of this new form, L 
