368 H. HONDA. 



PLATE IV. 



FIGS. 32 AND 33. Smaller spermatids. 

 FIGS. 34, 35 AND 36. Retrogressing smaller spermatids. 

 FIG. 37. Retrogressed cell of the smaller spermatid. 

 FIG. 38. Layers of the retrogressed cells. 



