204 TREUBIA VOL. II, 2—4. 
fig. 32a. On the other hand I do not recollect seeing much smaller jelly- 
like bodies in the empangs than the one in fig. 33. 
At Batavia the native population give these jelly-like masses the name 
of “kontol-ayer” !). If asked what those kontol-ayer are properly speaking 
they will unvariably reply: “telor-udang”, i.e. eggs of Decapoda Macrura. 
Upon investigation however | found that the 
kontol-ayer are the egg-cocoons of a Polychaete. 
Similar though considerably smaller egg-cocoons 
were discovered about 1850 by MAX SCHULTZE 
near the island of Neuwerk in the vicinity. of 
Cuxhaven at the mouth of the river Elbe. He took 
them for egg-cocoons of Arenicola piscatorum 
LAM. (= Arenicola marina L.). Afterwards however 
DE GROOT (2!) demonstrated that they belonged to 
Scoloplos armiger O.F. MULLER. 
ee ee When I first examined the contents of a kontol- 
jelly-like egg-cocoon col- ayer under the microscope, the fine grains observable 
aoe x Ae Bataviaem- in it with the naked eye, proved to be globular 
embryos either still practically motionless or already 
slowly revolving. Another cocoon contained larvae which had all arrived 
already at the phase of fig. 34, which evidently corresponds approximately 
with the Nectochaeta-stage of the pelagic larvae of other ee Three 
days later the larvae of the egg-case from ae 
which the larva of figure 34 had been taken 
had reached the stage of fig. 35. 
The larvae move fairly rapidly through the 
jelly-like mass in which there swarm also a 
large number of Ciliates, just as DE GROOT (?') 
describes for the egg-cocoons of Scoloplos 
armiger O.F. MüLLER. In other respects as 
well there is clearly a good deal of similarity 
between the egg-cocoons of Scoloplos armiger 
and the kontol-ayer of the Batavia empangs. 
Thus DE GROOT (7!) describes the filmy 
crust of the jelly-bags of Scoloplos armiger 
O. F, MULLER consisting of fine ooze and 
Diatoms, which in the old cocoons becomes Fi 
3 Slee : ig. 35. Larva of Eunice spec. 
wrinkled; this is found in exactly the same from a jelly-like egg-cocoon col- 
manner in the kontol-ayer, whilst also in both ted in the Batavia empangs. 
: i : 5 e larva is three days older 
cases the jelly inside the crust is pellucid. than the larva shown in fig. 
On May 28th, 1918 in pond G of Map 5% * 69. 
II which contained a good deal of kontol-ayer along the margins, the 
') This name is not very decent. Kontol indeed is at Batavia a vulgar native 
word meaning the human penis. 
