Plate III 

 All figures are from sections 



Fig. 29 Transverse section of equatorial plate of first cleavage mitosis, showing 12 chromo- 

 somes, the reduced number. 



Fig. 30 Telophase of first cleavage, showing chromosomal vesicles and daughter amphiasters. 



Figs. 31-32 Prophases of second cleavage. 



Fig. 33 Anaphase of second cleavage, showing divided centrosomes. 



Fig. 34 Four-cell stage, resting condition. 



Fig. 35 Eight cell stage in section. 



Figs. 36-38 Sections of young blastulae, showing cells in various stages of mitosis. In Fig. 36, a 

 transverse section of the equatorial plate with its 12 chromosomes is shown at a. Divided centrosomes 

 are seen in some of the mitotic figures. 



