igo BULLETIN OF THE BUREAU OK FISHERIES. 



4. The testis, like the ovary, is a paired tubular organ. The spermatozoa are con- 

 tained in the spermatophores and are probably transmitted from the male to the female 

 in these bodies. 



5. The formation of the blastoderm and the differentiation of the embryo takes 

 place in a manner which is quite typical for teleosts. 



6. As development advances, the ovarian follicle becomes highly vascular, increases 

 in size, and is filled with a transparent fluid in which the embryo is constantly bathed. 

 This fluid is doubtless aerated by the follicular circulation. The gills of the developing 

 embryo apparently become functional comparatively early. During the later stages of 

 intra-ovarian life, rhythmical breathing movements of the embryo may be observed. 



7. The young are bom in an advanced stage of development and show nearly all of 

 the diagnostic characters of the species. They undergo no marked raetamorphic 

 changes after birth. 



