212 TREUBIA VOL. II, 2—4. 
Diatoms which developed richly on the glass wall of the aquarium. To do 
this they swam to and fro close to the glass wall, more or less 
sideward, that is to say in such a way that the longitudinal axis of the 
body usually formed an angle of more than 45° to nearly 90° with the 
wall. Every now and then they darted forward till their mouth touched 
the wall and they could take a mouthful. Accordingly when on July 30th 1918, 
after the aquarium had not contained any more “tay-ayer” for a few days 
past, I examined the contents of the intestine of a few of these bandeng, 
then measuring 3.2 cM., inclusive of the caudal fin, this proved to consist 
entirely of a very large quantity of Pleurosigma-like Diatoms. 
That same day I likewise examined the stomach-contents of a young 
bandeng caught in one of the fry-ponds C of Map II, which, again 
including the caudal fin, measured 8'/, cM. The contents of its stomach 
consisted of: very small fragments of Schizophyceae-threads, a few small _ 
Diatoms and some fine mineral particles. 
On September 6th 1918 I once more !) saw, this time in the empangs 
of Ang Sun Hian near Kampong Fluit, how young bandeng were fed 
with Enteromorpha chopped small. They were little fish of about 6 centi- 
metres. | was informed that this feeding took place once a week. 
On September 24th 1918 I had again the opportunity to examine the 
stomach-contents of four young bandeng, about 10 centimetres long, taken 
from one of the fry-ponds C of Map II. The stomachs of these animals 
were strongly contracted and practically empty; the only things I found - 
in them being a few Oscillatoria-threads, a few filaments of Nostocaceae, 
some small Diatoms, a few somewhat larger Pleurosigma-like Diatoms 
and some mineral particles. 
On December 6th 1918 I again examined the intestine-contents of a 
bandeng brought from the empangs to the Batavia Pasar Ikan (fishmarket) ; 
it proved to consist of a fair quantity of Pleurosigma-like Diatoms, some 
Chaetomorpha-filaments, some remains of tissues of higher plants (detritus), 
some Copepods, a few Ostracods, a few small Dipterous larvae, a few 
fragments of the exoskeleton of small Crustacea, some very few Follieulina’s 
and some mineral particles. The foremost part of the oesophagus (with 
the spiral-folds) of this same bandeng contained: a few Pleurosigma-like 
Diatoms, a few Chaetomorpha-threads, a few remains of higher-plant tissues 
(detritus) a few Ostracods, the chitin-skeleton of the head of an eucephalic 
Dipterous larva and some mineral particles. 
On January 28th 1919, on the occasion of the catching of the bandeng 
for the Pasar Malem ?) I was offered another chance of examining the 
contents of the tractus intestinalis of eleven large bandeng. All these eleven 
bandeng originated from the same pond, situated just West of the pond 
system of Map Il. The gizzards of the first five bandeng were closely 
ng 1) cf. page 209. 
2) cf. note page 196. 
