SUNIER: Marine fish-ponds of Batavia. 189 
But it is not at all impossible that Ruppia rostellata might be able to 
live and occur in the Batavia empangs in water of still higher salinities 
than 57.9 oo. | 
At any rate the notes in my diary were not collected for the special 
purpose of ascertaining the highest salinity at which thriving Ruppia 
rostellata may still be met with in the Batavia empangs. 
In conclusion it may be recalled here that HORNELL (3!) mentions 
another species of Ruppia, namely Ruppia maritima KOCH, as occurring 
very generally in the shallow outer sea fish-fonds of Arcachon. 
As a third component of the submerged vegetation flourishing in 
the Batavia empangs must be mentioned Enteromorpha (Chlorophyceae, 
Ulotrichales, Ulvaceae). Portions of a couple of still very young and thin 
tubes of Enteromarpha from the Batavia empangs are represented in fig. 5. 
The Malay names which I heard applied to Enteromorpha 
at Batavia were “lumut prut ayam” or “lumut usus 
ayam” (both signifying “chicken-guts-alga”) and sometimes 
“‘lumut kembang” (=“blossom-alga’’). 
Enteromorpha is very common in the Ba- 
tavia sea-fish-ponds and often covers several 
square metres of the surface of a pond. Photo 
no. 5 (Plate X) shows us the northern end of 
pond G of Map Il, at the surface of which at 
the moment of taking the photo (27 IV ’18, 11 
a. m.) nothing but a rather large quantity of 
Enteromorpha was visible '). 
The young Enteromorpha, like the young 
Chaetomorpha, begins to develop from a fixed 
substratum. I was able to observe this a. o. on 
March 19th 1918 in pond G of Map Il, in which 
the Enteromorpha-vegetation of photo no. 5 
Fig. 5 _ (Plate X) was just then beginning to develop 
Portions of two still very from the bottom upward. The older masses of 
young and thin tubes of | ; 
Enteromorpha from the Enteromorpha | always found floating freely at 
Batavia empangs. X 30. the surface of the water, as shown by photo 
no. 5 (Plate X). This Enteromorpha-vegetation of photo no. 5 (Plate X), 
which therefore had already begun to develop from the pond-bottom 
about March 19th, 1918 and had arrived at full development about April 
27th following, began to droop on May 14th and had disappeared on June 
15th. Meanwhile the Ruppia-vegetation described above had appeared 
at the north end of pond G of Map II. 
DA 
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1) Quite beneath the surface of the water there was also to be perceived a young 
submerged vegetation growing from the pond-bottom upwards, consisting of Chaetomorpha, 
Ruppia rostellata and the Najas fatciculata R. BR. to be further treated below. 
