DEVELOPMENT AND LIFE HISTORY OF SOME TELEOSTS 
553 
after development progressed less rapidly, and hatching took place in about 4 days 
at a water temperature varying from about 26° to 28° C. (figs. 36, 37, and 38). 
Although the yolk mass, after the expansion of the egg is completed, occupies 
less than half the area within the eggs, as stated elsewhere, nearly the entire space is 
utilized later by the advanced embryo which becomes bent back on itself, with the 
tail pointed in the general direction of the head. The position of the embryo within 
the egg is not always the same. In most instances the head is pointed toward the pole 
of the major axis at which the adhesive threads are inserted, but occasionally it is 
directed toward the opposite pole. This fact is not brought out by Kuntz (loc. cit.) 
(fig. 39). 
Figure iO.—Gobiosoma bosci. From a newly hatched fish about 2 mm long. (Drawn by Etfie B. Decker. After Kuntz.) 
Newly hatched young, 2.0 mm long . — The incubation period occupies about 5 
days at the usual summer temperatures (around 24° to 27° C.) prevailing in the 
laboratory at Beaufort. The newly hatched fish is approximately 2.0 mm long and 
almost transparent. The air bladder is visible at the posteriodorsal aspect of the 
yolk mass. The vent is situated nearer the tip of the tail than the end of the snout. 
The mouth is inferior, although somewhat later it becomes strongly oblique, as shown 
subsequently. A few small pigment spots occur just over the vent and at the base 
of the ventral finfold posterior to the vent (fig. 40). 
Figure 41 . — Gobiosoma bosci. From a fish hatched in the laboratory, a few days old, and about 3 mm long. (Drawn by Effie B. 
Decker. After Kuntz.) 
Kuntz (1916) was able to keep the fish hatched in the laboratory alive until a length 
of about 3.0 mm was attained. The mouth in the meantime, according to the illus- 
tration presented had moved forward and had become terminal and somewhat oblique. 
The line of pigment spots at the ventral outline of the tail had become somewhat 
more conspicuous than in the newly hatched fish (fig. 41). 
The eggs and young hatched in the laboratory, upon which the foregoing descrip- 
tions are based, are known definitely to belong to G. bosci. The young up to 10 
mm in length, upon which the descriptions that follow are based, were taken in the 
tow and probably include both local species, as already explained. 
