PLATE 7 



EXPLANATION OF FIGURES 

 X 2250 



Prophases. N. insulata 



7S Early prophase, chromosomes diffuse on nuclear wall, M condensed. 



79 Later prophase, rings and crosses. 



■SO Late prophase, chromosomes fully condensed. 



81 Just before metaphase. 



N. irrorata 



S2 Early prophase, diffuse stage. 



83 Later prophase, rings and crosses. 



84 Very late projihase, spindle forming. 



N. undulata 



85 Early prophase, diffuse stage. 

 86-87 Condensation, irregular figures. 

 88 Very late prophase. 



114 



