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pointed processes, which are again retracted, Amoeba-like, in 
continual change, and are renewed afresh, and which gene- 
rally appear most numerous at the rounded-off hinder end. 
The spores of the Protomyxae resembled those of the 
MyxomycettE in form as well as in their movements, with 
this difference only, that the former, as long as they swarm, 
show no appearance of vacuoli. The next stages of both 
spores are also quite similar. Both come to rest after some 
time, assume an Amoeba-like position, and then develop (at 
least partially) by assimilating plasmodia. 
The swarming time of the Protomyxa spores seems to last 
at least one day ; at least, I never saw them come to rest on 
the same day on which they issued from the cyst. On the 
following day I mostly found them lying quiet at the bottom 
of the watch-glass ; the tail of the spore was drawn in, and 
the pear-shaped form of the body was exchanged for that of 
an irregular roundish disc, whose star-shaped circumference 
was drawn out into several processes. The reddish-yellow 
plasma bodies now completely resembled in outline the spores 
of Myxomycetse when they have come to rest, or likewise 
Amoeba radiosa of Ehrenberg ; only the surrounding pro- 
jecting processes (usually from five to twenty in number) 
were sometimes more of a slender cone-shape, and were 
sometimes more club-shaped (fig. 6). Most of the processes 
were simple, but, at this stage, the largest already began to 
divide themselves dichotomously, or repeatedly to ramify 
themselves. The protrusion and retraction of the ever-chang- 
ing processes was accomplished throughout in the same 
manner as in the lively moving species of Amoeba. A short 
time after the sporules of the Protomyxa had become 
stationary, and had passed into their Amoeba-like condition, 
they already began to take nourishment. With a drop of 
water I introduced a number of small Diatomaceae into the 
watch-glass, and those Amoebae which came in contact with 
the Diatomaceae attached their processes to them, and began 
to close round them in the usual manner. The Naviculae 
were soon entirely enclosed by single Amoebae, whose whole 
bodies, as it were, seemed to form only a thin mucous film 
over them (figs. 8, 9). The yellowish-brown plasma-contents 
of the siliceous skeleton of the diatom were assimilated by the 
Amoeba, which then drew itself back from the empty shelly 
covering, and recommenced the characteristic Amoeba motions, 
the constant protrusion and retraction of the ever-changing 
finger-like processes. The volume of the small Amoeba 
increased, perhaps, about twice or thrice by the digestion of 
a Navicula, and now the processes also began to lengthen, 
