134 BULLETIN OF THE BUREAU OF FISHERIES. 



the females but become spherical as soon as they become water-hardened. Contiguous 

 surfaces may remain slightly flattened. The average diameter is approximately 1.6 

 mm. The yolk sphere contains a few oil globules of unequal size which may be aggre- 

 gjated more or less closely or widely scattered (fig. 122). 



Embryology. — The eggs of this species present essentially the same pictures during 

 early embryological development, as do the eggs of the related species G. acideatus. 

 Their development is entirely typical and need not be discussed in detail. 



Pigmentation begins relatively early, and pigment is developed rapidly. Four 

 davs after fertilization (fig. 125) large black chromatophores are present over the entire 

 surface of the embryo as well as in the adjacent areas of the extra-embryonic blastoderm. 

 Small yellow chromatophores also occur scattered over the surface of the embryo but 

 are not conspicuous. 



Larval development. — Incubation at laboratory temperature occupied approximately 

 six days. The newly-hatched larvae (fig. 126) are 4.2 to 4.5 mm. in length. The vent 

 is located a short distance from the posterior end of the yolk sac and sUghtly more 

 than half the length of the body from the anterior end. The general color of the body 

 is dark brown. Yellow pigment remains sparsely scattered over the body but is ob- 

 scured by the greater abundance of black pigment. Large black chromatophores are 

 closely aggregated over the entire surface of the body and the upper half of the yolk sac. 

 The newly hatched fish is similar to the newly hatched larva of G. aculeatus, but much 

 more heavily pigmented. 



