PLATE 2 



EXPLANATION OF FIGURES 



Gryllotalpa borealis 



A Anaphase, side view, second maturation division, showing arrangement 

 of mitochondrial threads on the spindle. 



B Late telophase, second maturation division. The mitochondrial threads 

 have again divided and moved to the ends of the spindle. 



C A spermatid before transformation begins. 



D and E An early stage in the transformation of the spermatid. The elon- 

 gated body in contact with the nucleus and the spherical body were not present 

 in C. 



F A later stage than D and E. The mitochondrial threads have changed 

 and the elongated body has moved to the opposite side of the nucleus. 



G, H, I, J, K Still later stages in the transformation of the spermatid. G 

 shows the beginning of the axial filament. 



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