124 



BUl,L,ETIN OF THE BUREAU OF FISHERIES. 



Fig. 87, — Mature unfertilized egg. 



Fig. 88.— Ege with blastodisc (BD) fully differentiated. 



Fig. 89— Egg with blastodenn of a cells. 



Fig. 90. — Egg with blastoderm of 4 cells. 



FlO. 91. — Egg with blastoderm of 64 cells. 



Fig. 92. — Egg with blastoderm in moderately advanced stage 

 of cleavage, early stage in differentiation of periblast (PB). 



POMOLOBUS .ESTIVALIS. 



