400 
Just as the Collosphera-capsules secrete a hard membrane 
before the formation of zoosphores, so do also the Collozoa. 
Their Capsules acquire a sharp contour, and grow considerably 
larger. Their content contains besides the oil-bubbles 
not unfrequently a number of small crystalline rods, which 
are quite like those which we found in the Collosphera- 
zoospores. ‘These little rods seem, however, to be of no im- 
portance in the further development of the contents, since 
Capsules which behave themselves similarly not unfrequently 
occur in the same colonies with or without the little rods. 
The beginning of the differentiation of the contents is in- 
augurated by its breaking up into cuneiform aree arranged 
radially around the oil-globules (figs. 16,17). To be sure, 
this arrangement is by no means without exception, since the 
divisions of the Capsule-contents as often form irregular or 
spherical masses. ‘The differentiation now steps further in 
advance; the large protoplasmic aree break up into a number 
of small bodies, which are again able to divide themselves by 
constriction (fig. 18). 
When one squashes a Capsule in this stage, naked content- 
balls are seen to escape of various sizes, which are already 
entirely made up of small corpuscles. The indifferent 
behaviour of the oil-globules in the breaking up of the Cap- 
sule-content becomes here apparent. ‘They lie partly enclosed 
in the balls, partly free between the masses round about. 
Where only one oil-globule was present, I have always found 
it outside the aggregate of small spheroids. As in Collo- 
spheera so also here, the complete differentiation of the contents 
is indicated by the commencing contraction of the Capsule. 
The colonies obtain in consequence a coarsely punctate aspect, 
occasioned by the sharp contours of the Capsules and the 
yellow cells which bedeck them. One after another the 
Alveoli disappear, and the radiant Protoplasm almost entirely ; 
the Capsules become thereby generally so closely pressed 
against one another that they appear flattened out like a 
parenchyma-tissue whose intercellular spaces are filled up by 
Yellow Cells (fig. 19). In these masses of Capsules, as 
already the experience of Collosphzra showed us, the differ- 
entiation of the Capsule-contents, par excellence, takes place, 
although this may begin even in the normal habitus of the 
colony. 
So far the analogy of what takes place in the Collosphera 
is so close that it would be exceedingly strange if the last 
stage—the out-swarming of the corpuscles formed from the 
Capsule-contents—were to be wanting here. Unhappily, I 
was obliged by illness to break off my researches at this 
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