TREUBIA VOL. II, 2—4. 
Fig. 20. 
firmly attached to the zona radiata by the thickened 
proximal end, as appears when using higher powers. 
Outside this spot there are but few adhesive 
threads fastened here and there to the remaining 
exterior surface of the zona radiata. The question 
whether there are originally more adhesive threads 
attached to the zona radiata, and whether any ad- 
hesive threads are formed which are loose from 
the zona radiata right from the beginning, could 
only be settled by studying the development of the 
adhesive threads by means of sections through 
The same egg as 
represented in fig. 19, ovaries. 
only 24 hours older. . : : 
x 151/. In fig. 20 is represent- 
ed the same kepala timah 
egg as in figures 19 and 21, which was found in a 
tuft of Chaetomorpha from one of the empangs. 
The egg was youngest when fig. 19 was drawn; 
fig. 20 was drawn the next day and fig. 21 six 
days later again. The single long hair of fig. 21 
really consists of several adhesive threads twirled 
into one string. In order to see the egg better 
the draftsman before doing fig. 21 had removed 
the remaining adhesive threads still surrounding 
the egg and between which impurities had col- 
lected, with a pencil-brush. 
Fig. 22 shows how the eggs may be fasten- 
ed to algal filaments by means of the adhesive 
threads. The eggs drawn in this figure 22 are 
not, however, eggs of Haplochilus panchax, but 
of Haplochilus javanicus (BLKR.). The eggs of 
Fig,21. The same egg as rep- 
resented in figures 19 and 20, 
however respectively 7 and 
6 times 24 hours older. X 173/, 
the latter little fish are 
for one thing smaller than those of the kepala timah. In the following 
list will be found the largest and the smallest diameter of a number of 
eggs of Haplochilus javanicus (BLKR.) fertilized a few hours before they 
were measured, 
1.00 — 1.00 m.m. 
1.00 — 1.00 m.m. 
1.00 — 1.03 m.m. 
1.00 — 1.04 m.m. 
1.00 — 1.04 m.m. 
1.00 — 1.06 m.m. 
1.01 — 1.03 m.m. 
1.02 — 1.04 m.m. 
1.02 — 1,04 m.m. 
1.02 — 1.05 m.m. 
