even in this advanced st proto- 



ridges. 



rizontal section through su 



- . , This is in -o show 



the an t of ceils in horizontal plane. There is 

 here a closer tion of cells to the periphery, the 

 inner row being a derivative of the outer, while in the cen- 

 ter the ceils are more scattering. 



is -'-■ intermediate between those 



from tfhich igs. 57 , PI. IV,, ar JV 



sections i , 65, outer 



cells ahou .to elon ; . .:nr 



than the interior . . s are nucleated, 



and in one a ceil wall is cutting downward. While trie peri- 

 blast, Ls resting on it and e- 

 in the blastoder-i is t evidence 

 ed off. 



- 

 on t 3ur i . c e . 



, is very similar to t 

 cedin - . the cells are pn in size, 



bhose on the surface are noticeably elongated, some be- 



:onnections — ;in- ' 



