PLATE 4 



EXPLANATION OF FIGURES 



Notonecta insulata 

 X2250 



33 A, B, C Serial sections of entire spindle in side view, showing two small 

 pairs in center, components of Ma separate. 



S4: A, B, C Same, two small pairs arranged linearly. 



35-36 Metaphase of second division, polar view, showing 12 chromosomes, 

 XF in center. 



37 A, B Complete spindle, initial anaphase, side view. 



38-39 X and Y on separate fibers. 



40 A, B Sister anaphase groups of second division, from same spindle. 



108 



