370 MR. 8. LE M. MOORE’S STUDIES 
in figs. 15 and 25 is certain. The evidence is two-fold. On a 
warm afternoon at the beginning of June Z saw a cenobium, pre- 
cisely like that of fig. 25 e, detach itself from the zoosporangial 
wall and swim about inside the zoosporangium. Unfortunately 
just at that moment I was called away, and never had the good 
fortune of repeating the observation, and ascertaining what 
becomes of such ecenobia. But besides this, Z have found very 
occasionally free feebly motile coenobia in the neighbourhood of 
zoosporangia in the condition of fig. 25. One of these—biscuit- 
shaped like fig. 25 c, and, like it, two-celled—is shown in fig. 26; 
and a larger form, with whieh fig. 13 may be compared, is the 
subject of fig. 27, Pl. LVI. 
But besides this, two other kinds of cenobia—presumably of 
Apiocystis—were observed. The firstis shown in Pl. LVI. fig. 28: 
upon a dome-shaped wall were ranged about forty cells with long 
cilia; part of the wall, carried posteriorly in the rapid movement 
of which the coenobium was capable, had to some extent broken 
down, giving to the ecnobium the appearance of being the top of 
an Apiocystis zoosporangium. So much so was this the case, that 
immediately upon seeing it I exclaimed, “At last here is the 
ecnobium I have been looking for during so many weeks!” 
Zoosporangia with a large opening in the lower partthrough which 
zoospores— possibly coenobial ones—have apparently escaped 
may sometimes be observed (Pl. LVL fig. 30); and it is clear that 
if the rest of the proximal part of the wall were to break down, 
we should get the condition of fig. 28. Of such canobia I saw 
but four or five, and regret to say that though I did my utmost 
to directly observe so extremely interesting a fact as the breaking 
away of the distal half of a zoosporangium, success did not crown 
my efforts. I shall have a few words to say upon this later 
on: all that ean be now stated is that coenobia strikingly like the 
top of an Apiocystis zoosporangium, and either actually such or 
examples of an undescribed motile organism, occur in the same 
locality with Apiocystis. I venture to think, however, that it 
would be unsafe to found any positive opinion unfavourable to 
the suggestion propounded above, in view of the probably rapid 
manner in which the ccenobia might, by means of their powerful 
cilia, free themselves from the proximal part of the zoospor- 
angium, to the consequent minimizing of the chances of direct 
observation. 
The last form of cænobium is that of fig. 29, Pl. LV I., which was 
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