SUNIER : Marine fish-ponds of Batavia. 197 
In the first mentioned publication (°®) SWELLENGREBEL speaks of: 
1°. floating Enteromorpha; 
2°. great floating sods of Cladophora; 
30, Cyanophyceae in floating cakes mixed with mud; 
4°. a more or less coherent ') film, resting on the bottom of otherwise 
vegetationless ponds, composed of Cyanophyceae, Diatomeae, Bacteria 
and microscopic green filamentous algae with a sheath; 
5%. a fine, green, forked submerged aquatic plant, far more common at 
Sourabaya than at Semarang; 
6°. (in disused ponds) large patches of duckweed (Lemnaceae). 
In the second publication (°') in which, concerning the aquatic flora of 
the sea-fish-ponds, references to the former publication (°8) are made 
nowhere, SWELLENGREBEL mentions: 
a. “tubular algae’ (“buisalgen’) ; 
b. “wad-algae” (“propalgen’’); 
c. “flap-algae” (“flapalgen’’) ; 
d. “bottom-algae’’ (“bodemalgen’’). 
From SWELLENGREBEL’s descriptions (°') it appears with sufficient 
certainty, that in his second publication (°') by „tubular and wad-algae” 
he means Enteromorpha, it remaining however an open question 
whether his “tubular algae’ and “wad-algae” represent different species, 
or different stages of development of one and the same species of Ente- 
romorpha. SWELLENGREBEL’s “flap-algae” were quite probably Chaeto- 
morpha-masses, as | gather from his descriptions (°'). If I am correct 
in surmising this, then in SWELLENGREBEL’s description (°!) (page 141) 
the word “chromatophores” should be replaced by “pyrenoids” (for this 
cf. the beginning of this Chapter IV, page 183). That Chaetomorpha is common 
not only in the Batavia empangs, but also in the tambaks in other parts of 
Java, became manifest to me both when | examined a quantity of algae which 
Mr. VAN BREEMEN brought along for me from the marine fish-ponds of 
Sourabaya, and from a short visit I made to the tambaks at Bangil. 
Cladophora | never met with in marine fish-ponds in Java. SWELLEN- 
GREBEL (58) does not state how he came by this name, neither does he 
give a description of his “Cladophora”. Further the Enteromorpha and 
“Cladophora” of SWELLENGREBEL’s first article (°°) apparently correspond 
with the “tube- and wad-algae” and the “flap-algae” of his second article (°') 
respectively. In connection with this and with the description given by 
SWELLENGREBEL (°!) of his “flap-algae” | think | ought to conclude that 
by his “Cladophora” SWELLENGREBEL must have meant Chaetomorpha. 
The organisms mentioned by SWELLENGREBEL and quoted by me 
above sub 3°, 4° and d, apparently correspond with my “tay-ayer” organisms. 
1) As the English equivalent of the Dutch “samenhangend” SWELLENGREBEL uses 
“continuous”, 
