Flounder Embryo — 3 hours. 



^-^HO I k ^, Shell 



Flounder Embryo — 4 hours. 



- Blastoderm 



Flounder Embryo — \\ days. 

 Shell 



-Yolk 



Blastoderm 

 Flounder Embryo — 2\ days. 



STAGES IN IHE DEVELOPMENT OF THE FLOUNDER. I. 



