1913] YAMANOUCHI—ZANARDINIA 25 
masses which gradually round off as the zoospore primordia 
(fig. 108). 
A zoospore primordium when rounded off contains a centrally 
placed nucleus with its enveloping cytoplasm bordered by numerous 
plastids. At this time the primordium shows a nearly radial 
symmetry, which becomes changed later in connection with the 
formation of blepharoplasts. The process is as follows: There is 
first the movement of the nucleus and subsequent displacement 
of plastids. The nucleus 
begins to move toward the 
periphery of the body, dis- 
placing the plastids which 
are in its path. By this 
movement the nucleus does 
not quite reach the peri- 
phery, but almost all of 
the plastids are displaced 
from the region between 
the periphery and the nu- 
cleus, so that this region 
how contains only colorless 
cytoplasm. Then in this 
colorless cytoplasm an in- 
“efinite number of deeply Fic. 22.—Formation of blepharoplast in both 
. . aay 10n 0. e€pnaro) Ss 
oye =a i and gamete: a, portion ae sone 
nt , : gium showing two zoospores, in the lower one 
imilar granules also ap- of which two cilia are developed from a blepha- 
pear simultaneously aroun d snowed b, portion of a female gametangium, 
Pe  cloee tit, . seipigment snot deuner 
‘ ifferentiated by stains. 
ese granules, with proto- 
eo. “nea Poh are arranged in a row running 
granules lies just ery, and the outermost one of these 
developed aap i : he plasma membrane. Cilia are 
Schicld) just inside 2 oe of the outer plasma membrane (Haut- 
: ch the outermost one of thes 

