132 LIFE HISTORIES OF THE PROTOZOA. 
tiplyeby merely dividing into two portions, each part becoming 
an individual. 
The distinguished Russian microscopist Cienkowski has given 
an account of the mode of development of Protomonas amyjli, 
which corresponds to that of the lowest algze, such as Protococcus 
(see Clark’s Mind in Nature, p. 136, Figs. 73-79) ; both repro- 
duce by spores; those of the animal Protomonas may be called 
“zoospores.” Fig. 127 (copied from Cienkowski) represents at 
A this moner during the formation of the zoospores; B, a 200- 
spore hatched out; C, D (A—D xX 350 diameters), the Ameeba- 
like form it afterwards assumes. From these stages Cienkowski 
traced it to the encysted, or resting stage, E; (y, food; 8, a pro- 
jection inwards of the cell-wall; 2, moner-cyst X 450). This 
form lives in putrefying Nitelle. It should be observed that the 
Development of Protomonas. 
cyst of this Protomonas, as in the true Monads studied by Fa 
kowski, is composed of cellulose, while the granular contents be- 
come colored with chlorophyll. In these respects they are plants, 
but it should be remembered that cellulose is said to occur 10 the 
mantle of the Tunicates and various parts of Articulates and Ver- 
tebrates, while chlorophyll occurs in the Infusoria and Hydra. 
The course of development of Protomyxa has been observed Py 
Heckel. The orange-red contents of the ball or cyst (Fig- 128, 
A) of this moner, divided, after it had retracted itself from the 
hyaline capsular wall, into several hundred small, round, thor- 
oughly structureless, naked balls (Fig. 128, B). This pro 
Heckel regards rather as a “germ formation,” than a process © 
division or gemmation. These small globular masses of proto- 
plasm (a) are each drawn out‘into a Jong tail (b), and issue from 
