SUNIER: Marine fish-ponds of Batavia. 183 
when young, and not having had the opportunity to watch the escaping 
of the zoöspores, it was not impossible that the alga might belong to 
a different species. 
As to the zoöspores, on October 15th 1918 I came upon an empang 
of Mr. Görs’s near Muara Karang which was chokeful of Chaetomorpha 
and whose water, then possessing a salinity of 56.2 °/.. looked dark green 
as a result of the presence of large numbers of zoöspores with four cilia. 
Now as according to ENGLER and PRANTL (%) Chaetomorpha produces 
zoospores with 4 cilia, it is probable that in this pond I was really dealing 
with Chaetomorpha zoospores. 
it is well-known that in their youth the Chaetomorpha-species are 
anchored to some substratum or other. 
The lumut kain indeed, regularly begins to grow from the bottom 
of the empang or from some other fixed substratum. 
In fig. 1 is pictured the extremity of a Chaetomorpha-filament from 
one of the Batavia empangs; the cells of the extremity have evidently 
become differentiated into rhizoids with which 
Seh the young alga-thread is fixed to the substratum, 
133 The length of the cells and the thickness of the 
cell-wall vary considerably. For the difference 
in leneithr of the) cells see) igs) 27 andesa As 
to the thickness of the cell-wall, I received 
the impression that it generally increases in pro- 
portion as the alga lives in water of a higher 
salinity. I have not, however, collected any 
statistical data bearing on this point, and can 
therefore not guarantee the correctness of this 
impression. It is well-known that the one cell 
thick filaments of Chaetomorpha are not branched. 
As may be readily understood, 
from figs. 1, 2 and 3 it does not 
appear in a sufficient manner, that 
the chromatophore has the shape of 
a hollow cylinder. The figures show 
that this chromatophore contains a 
large number of pyrenoids. It has a 
Fig. 2 Portions of two Chae- number of openings by which it 
tomorpha-filaments from the may assume a net-like character. Small 
atlas SrBaues ug 160 fragments of the chromatophore may Ei 
: ig. 3 
even become entirely detached. Portion of a 
As said before, in the Batavia empangs Chaetomorpha shastae 
is very common and generally begins to develop from the? Sont 
bottom of the pond or from some other fixed substratum. I could Batavia 
gs. 
clearly observe this among other cases on March 19th 1918; on "es. 
Wie EN 
er 
ke) 
RT, 
ER DR 
> Fe 
DR 
æ 
x 
zt 
A 
ES 
FRE 
wos 
W 
BR 
\ 
bes 
| 
HET 
Yen 
he 
il 
it 
gi “a 
Re. 
VE 
Pats 
€ 
Ber 
poe 
= 5) 
Sn oy Za 
Ps 25 
& B, AS Si 
ES) ay 
SS > 
Sr 
EER 
ei 
PETER 
