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more minute (highly dyed) body occupying the centre of each 
of the conjugated individuals in the figure, may represent the 
vesicula intima, or inner vesicle (“ Binnenblase,” Haeckel). 
If, indeed, I may be correct in that assumption, then this will 
be the first instance (so far as I am aware) in which that 
element of the organization of a typical ‘‘ Radiolarian ”’ has 
been perceived in any fresh-water representative. Still, it is 
a portion of the structure that I believe would be quite im- 
possible to detect or see in this form in the ordinary condition 
of the fully-grown rhizopod, owing, I may presume, to the 
solid or opaque appearance of the “central capsule” above 
alluded to. At least, I fear, I should never myself have 
suspected its existence or have seen it in such examples with- 
out the application of the reagent. 
But the experiment illustrated by the figure having shown 
the actual existence of such an inner body, leaving its precise 
homology in abeyance, I naturally was anxious to refind some 
of the more minute, and, therefore, less opaque and less 
granular forms, which, as I have said, I would be much in- 
clined to regard as younger examples of A. spinifera, in order 
to submit such to a more critical examination. Fortunately 
a gathering, just made in County Tipperary, revealed a few 
such, and of one of these I endeavour to give a portrait in 
fig. 8, which, indeed, though so minute, seems to give a 
certain indication of the yellow globules, though faint in 
colour. I had now, however, no difficulty in percetving 
in the centre of such a minute example a delicate pale and 
colourless globular little body, whose nature can admit of but 
two interpretations, one only of which, of course, can be the 
true one. It is eitherastructure quite homologous with that 
represented in Greeff’s figure, and indicated also in mine 
(fic. 7), in fact, the presumable “ central capsule,” or else 
it represents the inner minute body so deeply dyed in the 
example figured. Probably, had the very small specimens in 
this particular gathering been sufficiently numerous, the 
experiment of the application of the carmine solution would 
have assisted to decide the point; I could not succeed, how- 
ever, as yet in bringing it to bear on any of those minute 
specimens. But although I must leave the question an open 
one as yet, I may draw attention to the consideration that if 
the little central body in fig. 8 really represents the same 
body as figured by Greeff, and readily seen in examples taken 
by myself—the presumed “ central capsule ’”’—it ought to be 
larger in proportion, as this generally occupies in this form a 
comparatively considerable extent of the body, and that there- 
fore, so far as I can yet form an opinion, it should rather be 
