DELSMAN: Fish Eggs and Larvae. 103 
The larva represented in fig. 7 has a length of 22 mm from the tip 
of the snout to the end of the tail. Though it is not stretched, yet this 
larva, when figured (with the drawingprism, as all figures of this article), 
was lying flat. The snout has elongated still further and several 
spiny prominences and serrated ridges appear on it. A spine above each 
eye and one in front of the pectoral fin were already visible in fig. 6. The 
two rows of fine hook-like spines along both sides of the body are well 
developed now up to the tail. The number of spines has increased 
considerably. The largest spines are found on the anterior part of the body. 
The pigmentation is the same as in the foregoing stage, As far as I could 
make out the anus is still situated under the 50th myotome. The development 
of the dorsal and the anal fin has proceeded further, but a remnant of the 
unpaired median fin fold is still present. 
The state of development of the tail is interesting. In the fullgrown 
Fistularia a long flagellum springs from the middle of the caudal fin and 
forms a whip-like prolongation of the tail, tapering slowly to the end. In 
fig. 7 we see that in an early stage two of the middle fin rays of the 
caudal fin have grown out and fig. 8b shows us that these two rays, of 
which the dorsal is the longer, together form the flagellum. 
Fig. 8. Head and tail of a larva 45 mm lus (to the end 
of the caudal flagellum), 11 X 
d, dorsal serrated ridge, /, lateral serrated ‘ridge, n, nare. 
Fig. 8 represents the head and the tail of a larva of 45 mm, measured 
from the tip of the nose to the end of the flagellum. On the upper side 
of the snout a median serrated ridge has formed, the first teeth of which 
were visible in fig. 7. In larvae of 15 mm I found only one tooth, in 
larvae of 18 and 19 mm two, while in fig. 7, length 22 mm, the third 
tooth makes its appearance. Farther back this ridge branches into two 
diverging serrated ridges running above the eyes. Beneath the eyes similar 
paired serrated ridges are present which continue nearly parallel on the 
underside of the snout. Further a paired serrated ridge is developing 
laterally on the snout. ; 
