Plate V 

 All figures are from sections 



Fig. 47 Submerged first maturation spindle, showing divided centrosomes and dyads passing to 

 the poles. 



Fig. 48 The two nuclei, which have probably resulted from the mitosis seen in the last figure, 

 are preparing for a second mitosis. 



Fig. 49 Probably later stage of the same; the four nuclei may have arisen from a second submerged 

 mitosis. 



Fig. 50 Transverse section of equatorial plate of first cleavage spindle, containing 23 chomosomes; 

 the increased number of chromosomes is doubtless due to the fusion of two submerged maturation 

 nuclei to form the cleavage nucleus. 



Figs. 51, 52 Enlarged first maturation figures, which probably behave as cleavage figures and lead 

 to an equal division of the egg. In the anaphase shown in Fig. 52, the chromosomes are double and 

 have the typical appearance of dyads. 



Fig. 53 Prophase of multipolar mitosis in undivided egg. 



Fig. 54 Abnormal four-cell stage, showing multipolar mitoses in three cells. 



