BODY SIZE AND CELL SIZE 



173 



P'igs. 4, 5 Eight-cell stage of eggs of C. plana and C. convexa, drawn to the same 

 scale, showing relative sizes of blastomeres, nuclei, spindles, etc. 



Figs. 6, 7 Twenty-four-cell stage of eggs of C. plana and C. convexa, drawn to 

 same scale and showing relative sizes of blastomeres, nuclei, and protoplasmic and 

 dcutoplasmic regions of the egg. 



