SUNIER: Marine fish-ponds of Batavia. 299 
larvae (cf. Chapter VII) there always occur in the 
algal masses of the Batavia empangs a great many 
representatives of a certain Amphipod belonging to 
the Gammaridea, represented in figure 44; a number 
of small brown Hydroporines (fig. 45 and 46); many 
Copopods (fig. 47 and 48); a fairly large number of 
Ostracods (fig. 49); some Cladocera (fig. 50) and Fig. 48. Copepod with 
sometimes more, sometimes fewer small shell-bearing ae oe or, as 
Gastropods. thurnia, collected in the 
The Gammaridea kept in {he aubmers de cale 
small aquaria at my laboratory Seen from the left side. 
built little dwelling tubes from AS: 
all sorts of vegetable materials. When there was no 
other material within reach the little tubes were built 
with Chaetomorpha threads. 
Fig. 49, Ostracod In the Cladocer of fig. 50 the brood- 
Ut pouch is clearly visible at the dorsal 
er submerged aquatic side within the bivalve shell. 
en ee On the dorsal side of the abdominal 
left side, X 26. segments of the Copepod of fig. 48 
five specimens of Cofhurnia (Ciliata, | 
Peritrichida) have fixed themselves. I also found Cofhurnia if 
at the empangs attached to Chaetomorpha-threads, likewise Fig. 50. Cla- 
Vorticella (Ciliata, Peritrichida) and especially also Folliculina ee 
(Ciliata, Heterotrichida). masses and hig- 
The aquatic Hemipteron, an 
represented in fig. 51 and the Batavia em- 
52, and belonging to the panes Bon 
genus Sphaerodema (family X 31'/2. 
Belostomatidae) I frequently came across 
in the algal masses of the Batavia empangs. 
The Sphaerodema females, it is well known, fix 
their eggs on the backs of their males. Fig. 51 
shows us a Sphaerodema male thus burdened 
with eggs, which I captured in an empang. 
I also found at the Batavia empangs 
Fig. 51. Male of Sphaerodema larvae of Odonata Anisoptera. I mention 
on er seen this especially because these larvae, repre- 
ation of the Batavia empangs. X 2°/,. sented in figures 53 and 54 were living on 
February 23rd 1920 in water possessing 
a salinity of 20.1 °/. Before that, viz. on April 29th 1919, I had aiso 
come across a great number of larvae of Odonata Anisoptera in a shallow 
piece of water on Verlaten-Eiland (= Deserted Island, in the Krakatau 
group), this water having at that moment a salinity of 22,5 oo. 
