ARCHER—ON RHIZOPODA. 939 
This must be accounted a rare form; the distinct situations in Co. 
Wicklow, in which | have found it, are perhaps, not as many as six, 
and the individual pools not quite twice that number, yet in some of 
these I almost think I should hardly fail to get examples, with perse- 
verance, at any season. But although thus seemingly restricted to 
spots, and never abundant, I fancy this fine form may be more widely 
distributed than we imagine, for only the other day I saw at least two 
examples from near Glengariff, but they weve poor ones. A large ex- 
ample, witha little experience, can be seen by the unassisted eye, like a 
greyish-green dot, almost as large as some specimens of Actinospharium 
Lichhornu. 
I shall again advert to this organism and its position in a future 
part of this communication. 
Cystophrys Haeckeliana (Pl. VIII., figs. 1 and 2), and C. oculea, 
gen. et sp. nov. (fig. 3.) 
The next type, which presents itself under two forms, is destitute 
of the hard parts characterizing the two preceding, and thus recedes 
further in that regard from the true Radiolaria of Haeckel; but, though 
wanting in anything which might be called skeleton, there is a part of 
the organization presented which calls to mind the “‘ yellow cells” per- 
vading the majority of that great group, so rich in multitudinous forms. 
But whilst there is seemingly a community of characters in the two 
Rhizopods now to be drawn attention to, I am not, indeed, myself yet 
quite satisfied that they ought truly to be regarded as congeneric, 
owing mainly to the diverse character of their pseudopodia; but still, 
for the present at least, it is desirable to leave them together. As in 
the previous instance, I defer to the latter part of this communication 
the special generic and specific descriptions of the forms drawn atten- 
tion to, giving for the present merely a few cursory remarks upon 
them. 
I shall first advert to the form which I first met with, though, as 
experience has shown, it is the more rare. 
The Rhizopod which I have named Cystophrys Haeckeliana (Pl. 
VIII., fig. 1), is of an irregular, though normally of a roundish figure, 
possessing, immersed in the body-mass, a number (often very great) of 
spherical cells, with dense granular contents enclosed in a special wall, 
and each with a nucleus and nucleolus, these cells forming a subglo- 
bose internal cluster; they, however, sometimes are more or less scattered, 
and even separated into minor groups. These central cells are pretty 
much of equal size, though occasionally a few somewhat smaller or 
larger than the average—about 1-1700 of an inch—present themselves. 
The nucleus appears to be usually, if not always, excentric, with an 
excentric nucleolus ; but the nucleus is sometimes not evident, most pro- 
bably owing either to the cell-contents being too thick and dense to 
admit of its being seen through them, or to its being turned away from 
that side which is towards the observer. The nucleus appears of a light 
