734 LIFE HISTORIES OF THE PROTOZOA. 
tained very numerous vacuoli, and which had formed a very ex- 
tended sarcode net, with many branches and anastomoses, after 
some time began to slacken their extremely rapid currents, and to 
simplify their pseudopods. The silicious shells of the many dia- 
toms which had been absorbed were rejected, and the branches 
and twigs of the pseudopods were successively retracted, At last 
they drew back the main stems, which had everywhere become 
simple, into the central plasma-body, and the entirely homoge- 
neous sarcode body took the form of an irregular lump, and 
finally rounded itself into a regular ball. l 
‘“ Now commenced the separation of the covering of the cyst, 
in which the sharply defined single outline of the orange-red 
plasma-balls passed into a perceptible, though certainly fine, 
double outline. A second, and then a third, concentric boundary 
line soon’ followed this, and then the proper concentric hyaline 
cyst-covering appeared somewhat quickly (in the course of a day) ; 
its layers corresponded with the above stated breaks of the sepa- 
rated gelatinous skin. At first a quantity of vacnoli were still 
perceptible in the plasma during the encysting process, which as 
peared and disappeared here and there, but visibly decreased in 
numbers ; and after the complete development of the cyst covering, 
no vacuoli could be any longer perceived in the orange-red plasma, 
now interspersed with numerous granules. ‘The encysted plasma- 
ball was now no longer to be distinguished from those red balls 
whose transition to the mass of sporules I have above described. 
Thus was the cycle of the generation of the Protomyxa completed, 
and the course of its simple and remarkable life history estab- 
lished.” sae 
- The phases may be thus summed up :— 
1. The free swimming flagellate state (sporule or zoospore). 
2. The creeping Amæba state. ' 
3. The reticulated Rhizopod state. 
4. The encysted state. 
‘Somewhat similar is the development of Vampyrella spirogyr®s 
which penetrates into the cells of the fresh-water plant Spirogyt™ 
and absorbs its protoplasm. Fig. 129, A, represents the adult, 
with its radiating pseudopods, and a large one in the act of boring 
into the walls of the plant. It then withdraws its pseudopodi: 
and assumes what Cienkowski calls the cell-state. During ps 
period it is surrounded by a delicate membrane. The granuli 
