300 TREUBIA VOL. Il, 2--4. 
In small aquaria with water from the 
marine fish ponds in which were put 
exclusively plants and animals collected 
from the empangs, I frequently saw pretty 
Nudibranchs, one of which is represented 
in figures 55 and 56, moving along the 
glass wall or creeping among the Chaeto- 
morpha threads. 
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Fig. 52, Male of Sphaerodema 
spec. carrying eggs. Ventral view. 
From among the submerged vege- 
tation of the Batavia empangs. 
x 23/4. 
The Hexactinid of fig. 57 
was also discovered by us in an 
aquarium of this kind. When ] 
had the animal drawn the drafts- 
man the first day got as far as 
a general sketch in pencil and 
finishing the 36 tentacles in ink. Fig. 53, Larva of an Anisopterous Odonate 
The animal was then put back from the Batavia empangs living in water whose 
into the aquarium. The next day salinity amounted to 20.1 */w. Dorsal view. X 51/2. 
however it was not found again and in fact it was never seen again after 
that. Owing to its disappearance I could not examine its interior so that 
I am not in a position to say 
SDS for certain to which group of 
à the Hexactinidae the animal ought 
to be reckoned. Outwardly how- 
gi ever it strongly recalled the 
Gn Halcampina. 
ee us DE In con- 
clusion the 
figures 58and 
59 represent 
a little animal 
that I picked 
up in an em- 
oO 
ala, our as Fig. 55, Nudibranch 
a matter Of occurring among the 
Fig. 54. Larva ofan Anisopterous Odonate from fact in an em- submerged vegetation 
the Batavia empangs living in water whose salinity inthe Batavia empangs. 
amounted to 20.1 2/5. Ventral view, D ol pang that de- Dorsal view. X 81/2. 
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