LIFE HISTORIES OF THE PROTOZOA. 747 
a capsule of a young Collospheera without the latticed shell), held 
together by a common mass of protoplasm. These capsules are 
separated by a certain interval from one another, while the proto- 
plasm binding them together consists of alveoli (vesicles) of 
various sizes, between and on to which sarcodic threads and net- 
works are disposed. “I always found,” he adds, “the capsules 
supported on the surface of the alveoli, often lenticular, com- 
pressed, and enclosed by a radiating layer of protoplasm, which 
also spreads itself over the alveoli, and passed over continuously 
into the sarcodic envelope of neighboring capsules. Besides those 
alveoli which carry capsules, there are Fig. 135. 
many smaller, which are free from cap- 
sules,.” 
Collosphera spinosa (Fig. 135, B) pos- 
sesses a fenestrated shell beset with small 
spines, which encloses a capsule with a 
protoplasmic investment. Fig. 135, B, a, 
indicates the problematical yellow cells. 
ig. 135, A, indicates a young capsule of 
another spineless species, C. Hualeyi 
Mill. The young capsule of this species 
is naked, embedded, without any shell, in 
a radiated protoplasmic sheath, not emar- 
ginated by any sharply marked envel- 
ope. ‘In this stage they often divide 
themselves by fission into two halves. 
Not until maturer age does the capsule 
obtain a resisting membrane, and become 
enclosed in a fenestrated shell. 
The next change which takes place in 
the capsule is its division into a number 
of little spheroids. This process is accomplished in a single day 
in C. Huzleyi. These spheroids become monad-like bodies, filling 
the capsule with a mass of corpuscles having a tremulous move- 
ment, and which finally swarm out in all directions (Fig. 135, B) 
from the capsule as true zoospores (C). The capsules now die 
and break up. These zoospores are provided with two long cilia. 
In the interior are a few oil drops, and a little crystalline rod, 
which sometimes projects out of the body. 
“Among the swarms of swimming zoospores lay many motion- 
Collosphera. 
