266 NATURAL HISTORY SOCIETY OF DUBLIN. 
consistent, and in itself (unacted on by outward forces) the less change- 
ablein form. When spicula are characteristic of the species, it is the 
outer region which bears them—when colouring granules (green, red, 
or yellow) are characteristic of the species, it is the inner region which 
contains them. It is the inner region which projects the true pseudo- 
podia, these passing directly through and through the outer investing 
region; and further, it is the inner region which receives and digests 
the food in such forms as have shown crude objects incepted. But 
sharply marked off as may be the inner globular portion from the outer 
investing stratum, there appears no evidence of a ‘‘ capsule” including 
the former; nor does it appear, therefore, that the outer can be re- 
garded as homologous with the “ extra-capsular’? and the inner as 
corresponding to the ‘‘intra-capsular” region of a true or typical Ra- 
diolarian. 
Itis true that ere now, in bringing forward before our Club Hetero- 
phrys Focku for the first time, I have suggested a different view,* and 
it is also true that Greef proposed, in his recent paper, the same 
view, which I then suggestively put forward, of the presence in this 
Rhizopod (which I think I see portrayed in his fig. 35), of a ‘“‘ central 
capsule” represented by the definite outline of the inner globular 
body. But I do not any longer see the justice of the assumption, 
when compared with the seemingly true ‘‘ central capsule’ of the 
forms contained in his new genus Astrodisculus and <Acanthocys- 
tis spinifera, for the very same sharp line of demarcation exists in 
those forms ; because they contain within the globular central portion 
a capsule-like structure, it is unnecessary to assume the outer boun- 
dary of the inner region as the representative of the ‘‘ central cap- 
sule,” and yet the globular inner region seems to me to be in both 
quite alike in this regard. But it further appears to me to be indispu- 
table that (in H. Focku, or Pompholyxophrys punicea, for instance), — 
there is no capsule enclosing the globular central portion—first, because 
it cannot be seen when crushed or otherwise—secondly, because the 
margin of the inner globular region sometimes shows pulsating vacuoles 
(in H. Lockii), like those of Actinophrys or Actinospherium — and, 
thirdly, because crude food is incepted into it—all which could 
not happen were there a rigid ‘‘ capsule’ (even though minutely ‘‘per- 
forated”’ for the passage of pseudopodia) enclosing it. 
If this outward boundary of the inner globe in Heterophrys Fockw 
be truly the homologue of the ‘‘ central capsule,”’ with however delicate 
a wall, then the same part in Astrodisculus must have a like significa- 
tion, and in that case must not, surely, the central globe represent 
rather the ‘‘inner vesicle” (‘‘ Binnenblase”’)? 
Nor can this outer region, as it seems to me, be supposed to be truly 
the same thing that is, homologous, with that sarcode layer attributed 
by Wallich to the Polycystina—the ‘‘chitonosare’ Wallich—which 
* “ Proc. Dub. Mier. Club.,” 19th Sept., 1867, in “ Quart. Journ. Micr. Science.” 
