Sixteen-Celled Stage. 



Intermediate between the eight and sixteen-colled stages^ 

 are found many blastod^ twelve, fourteen, ana fifteen 



cells. These are in fact more a 

 with exactly sixteen cells. 



i s.- ,• ■ , .1. show re idst j ular sixtean- 



celled stages that have been fc 



the corn: - 3s shown for 



..,rranu>s ' '91 usari f '3 . 



These blastoderms av i by each of the c&lLs in 



^igs. , , or , Pi, I. dividing into two. In Fig. I 6 all 

 .li save on L, or at 



In Fig .17 

 the bl £ are arrg , ,42, PI, 



II., is a section in - i ""i . . 



PI, I.j ring to divide into thirty-two cells . 



central cells ffi] 1 ividi form ■ - 



ior ceils, - he outer cells 



cells bot , sit: 



of the centrosomes-, L .. ee'lls forj ireh roo'fija 



over a con. n cavit; , 



Leir outer ends into vesicl 

 are covered by thin pre _c sheets or . . i .44, 



