PLATE 3 



EXPLANATION OF FIGURES 



Gryllotalpa borealis 



A to Q Further transformation of the spermatid into the spermatozoon. 

 A and B are two views of the same stage. G is a cross section of the mitochondria 

 and axial filament in the same stage as K. I is a view of the middle-piece at 

 right angles to H. J shows the wave like movement of the cytoplasm along 

 the tail. L shows the axial filament extending beyond the cytoplasm. M, N, 

 O, P, show the elongation of the nucleus. Q is a mature spermatozoon. Some- 

 times the acrosome stains dark like the nucleus. In the final stages the mito- 

 chondria and axial filament seem to lose their identity. 



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