EXPERIMENTAL FISH EMBRYOLOGY 



377 



JUST FERTILIZED CONCENTRATION OF PROTOPLASM AT POLAR CAP 2 CELL - I HOUR 



BLASTULA - 3 HOURS 



3 HOURS -HP 



10 HOURS 



12 HOURS 



DAYS TO HATCHING 



YOLK SAC- HATCHED 



EARLY DEVELOPMENT ^' 

 OF '* 



ORYZIAS LATIPES -^ 



THE JAPANESE MEDAKA L^V^ 



OPTIC VESICLES 



Photographs by L. Roth 



TAIL SOMITES 



