76 
Proceedings of the Royal Irish Academy. 
moment revert. I refer to the formation of vacuoles therein. I left 
the allusion to this in abeyance, because the appearances accompanying 
its display are curious in relation to the presence of the remarkable 
outer coat, which I proceeded therefore to describe first. 
Although, however, the formation of pulsating and non-pulsating 
vacuoles is a phenomenon so frequent in various genera of Ehizopoda, 
their existence in the present form seems to be rather exceptional than 
otherwise. 
Such a specimen as that repeated in my fig. 2 offers, however, an 
example of this condition in a pronounced degree. Here the whole 
body-mass is more or less areolated by the presence of vacuoles, and 
the green and colourless granules are pushed aside, and these run more 
or less into a reticulately disposed arrangement between the vacuoles, 
the elliptic bodies naturally falling into a position more or less end to 
end. But not only do those internal vacuoles exist, but no less than 
three marginal ones appear in the example figured, showing a distinct 
pulsation in action, very much like that of the marginal pulsating 
vacuoles in Actinophrys, Actinosphserium, Heterophrys {IE. Focldi^ 
mihi) and others. 
But, perhaps, the most interesting circumstance connected with 
these pulsating vacuoles is the way they stretch and seem to attenuate 
the outer coat, as seen in two of those present in the example figured 
(Pig. 2). I have not been able to see that they caused an opening in 
the coat ; at all events, on collapsing, the latter had quite its ordinary 
aspect. From the appearance here presented, we see something like 
what I imagine ought to reveal itself before an advancing pseudo- 
podium, did not it actually penetrate through and project beyond the 
outer coat, as I have already conveyed. The third marginal vacuole 
in the rather energetic example figured occurs on the broad projection 
giving off the pseudopodia, and seemingly here without the covering 
of the outer coat. Unlike the marginal vacuoles of the Actinophryans, 
these were slow in action, pulsating only a few times and disappearing, 
nor recurring after a long time of waiting, until finally the dip dried up. 
But our form occasionally, indeed rarely, presents yet another 
characteristic : this I have tried to repeat in Eig. 3. This consists 
in the* somewhat sudden appearance of a fitfully more or less deep 
halo of very pellucid sarcocle matter, outside the whole body-mass and 
outer coat — sometimes involving the example completely round — at 
other times seemingly developed over only a portion of the superficies. 
So far as my observation reaches of the occurrence of this curious- 
looking envelope, it has presented itself only in the examples from the 
third locality (county Tipperary), and in those without chlorophyll- 
granules, and in which, too, the hair-like appendages were least deve- 
loped, or, as in the example figured, all but obsolete. Whether, 
however, there is more than meets the eye in the circumstance just 
mentioned, I must leave in abeyance. But, to describe the appearance 
presented more closely : one is watching an example in the hopes that 
pseudopodia may be extended, or to have a view previous to treating 
