PLATE 1 



EXPLANATION OF FIGURES 



Gryllotalpa borealis 



A Spermatogonial cyst showing mitochondria in the inner end of the cell. 



B The early growth period showing mass of mitochondrial granules and 

 chromatoid body lying in the cytoplasm. Two other bodies are also present 

 in the cytoplasm. 



C A mitochondrial mass from the early growth period showing a central 

 spherical body. 



D The nucleus, mitochondria and chromatoid body in the prophase of the 

 first spermatocyte division. 



E and F Metaphase plates, side views of the first spermatocyte division, 

 showing the mitochondrial threads. 



G and H First division, metaphase plates, showing the arrangement of the 

 mitochondrial threads around the spindle. 



I and J Two late anaphases of the first spermatocyte division. In I, the 

 mitochondrial threads have divided; in J, they have moved to the end of the 

 spindle. The filar arrangement here seems to be lost, due in part, perhaps, to 

 the fact that the slide was destained more than usual. 



320 



