ARCHER, ON STEPHANOSPHERA PLUVIALIS. 127 
abundantly well differentiated. The latter, I apprehend, 
more correctly regarded as actually the so-called “ primordial 
utricle,” was hyaline, presenting a border of nearly equal 
width all round, and at all parts of the external margin, except 
at the attenuated extremity, was very clearly and sharply 
defined ; at the narrow, mostly bluntly pointed extremity, as L 
have already said, the margin presented a somewhat granular 
appearance, or at least not a smoothly defined “outline. 
Beyond the limits of the immer boundary of the hyaline 
border the contained green granules did not infringe, no 
matter how energetic or changeable the movements of the 
pseudopodal processes (figs. 4, 5, 6). 
The changes described did not take place by any means 
simultaneously in all the eight primordial cells of any 
Stephanospheera-globe ; but while one, perhaps, might have 
attaimed the complete amceboid state, another might be still 
in the simple condition of a rounded uncoated cell, without 
as yet any apparent intention to undergo the wonderful 
change described, whilst several of the others might exhibit 
various intervening phases between both conditions (fig. 3). 
During the changes of the primordial cells described, the old 
common hyaline envelope-cell of the Stephanosphera became 
collapsed and burst, or, it may be, more or less dissolved, and 
from its trammels the now reptant amoeboid primordial cells, 
by means of what were decidedly their own automatic move- 
ments, by degrees niostly all succeeded in becoming one by 
one wholly emancipated. 
A pseudopod was projected from the broader rounded an- 
terior extremity of one of the so greatly modified primordial 
eclls, not slowly—not, as it were, hesitatingly—but with great 
vigour and considerable rapidity. The ‘hyaline lobose ex- 
pansions were generally extended to about a quarter or a 
third of the whole length of the total amceboid body ; and no 
sooner had one began to be projected than a rapid flow of the 
granules at once took place into it, but still not infringing on 
the hyaline border. This was scarcely accomplished when 
another similar lobose expansion was projected from the 
opposite side of the frontal or anterior margin, and thus, by 
drawing into it a similar influx of the granular contents, 
rapidly “obliterating the former. One, two, or three (rarely 
more) of these lobose expansions, were mostly evident at a 
time, but, of course, in various degrees of expansion and 
retraction, an influx of. the eranules taking place into that 
most recently formed at the expense of the others, the newest 
advancing always onwards beyond the others, and thus was a 
rapid reptant movement executed (figs. A, bs 6), a Eiieuw 
