DEVELOPMENT AND LIFE HISTORY OF SOME TELEOSTS 
581 
8 hours at a water temperature of 25° to 27° C. (fig. 79). In about 24 hours the germ 
ring becomes evident (fig. 80) and in 48 hours the embryo already is well differentiated. 
Generally only a part of it is visible from one viewpoint, as any part lying underneath 
Figtjbe 75. — Hypsoblennius hentz. From egg in 4-cell stage, 
about 2 to 3 hours after fertilization. (Drawn by Nell 
Henry.) 
Figure 77. — Hypsoblennius hentz. From egg in about 16-cell 
stage, lateral view; about 3)4 hours after fertilization. Adhe- 
sive disk shown at upper margin of egg. Note round form of 
shaded bodies in yolk. (Drawn by Nell Henry.) 
Figure 76. — Hypsoblennius hentz. From egg in 8-cell stage, 
lateral view about 3 hours after fertilization. A slight de- 
pression in the egg at place of attachment opposite the blas- 
todisc is not shown. Note elongate shape of the shaded 
bodies. (Drawn by Nell Henry.) 
Figure 78. — Hyposblennius hentz. From egg in a moderately 
advanced cleavage stage; probably about 6 hours after fertil- 
ization. Only that part of the blastoderm projecting above 
the yolk is shown as the rest is obscured by the opaqueness of 
the egg. (Drawn by Nell Henry.) 
the now very dense yolk cannot be seen (fig. 81). The tail was curved underneath the 
yolk where it could not be seen and for that reason was not shown in figure 81. 
The development proceeds slowly for such a small egg after the embryo once is 
well formed. The embryo may be expected to extend three-fourths of the distance 
around the egg in about 3 days at a water temperature of 25° to 27° C. Somites are 
evident in at least a part of the body, the eyes are well formed and punctuated with 
