PLATE 2 



EXPLANATION OF FIGURES 



Clava leptostyla 



6 Growing egg in position at the end of the gonophore. Chromatin emission. 

 X 1700. 



7 Germinal vesicle of a large growing egg. Nucleolus vacuolated and lightly 

 staining. Chromatin emission going on, yolk bodies forming. X 1500. 



8 Germinal vesicle in the egg at the end of the growth period. Chromatin 

 emission still continues. Chromatin of the reticulum forming strands which 

 later become the chromosomes. X 1500. 



9 Chromosomes forming in the germinal vesicle, the (-hromatin emission not 

 concluded. X 1500. 



10 Second maturation spindle with 1 2 chromosomes ; first polar body showing. 



11 a, b Two adjacent sections, showing in b the first polar body and sperm 

 nucleus; in a a ]>ortion of the second maturation spindle which contained 12 

 chromosomes. 



96 



