322 J. E. WODSEDALEK. 



PLATE V. 



FIGS. 58-61. Early spermatids showing the characteristic structure of the 

 nucleus, and the position of the chromatoid body. Fig. 60 shows two bodies of 

 practically the same size as the chromatoid body. 



FIGS. 62-67. Resting stage of the spermatid. Figs. 62-65 show the large 

 nucleolus or the accessory chromosome. Fig. 62 shows the chromatoid body near 

 the nucleus; Fig. 63 shows it very near the centrosome which is out of its sphere; 

 Fig. 65 shows it at the periphery of the cell; Fig. 66 shows it near the centrosphere; 

 and Fig. 67 shows it far from the centrosphere out of which the centrosome had 

 just emerged. 



FIGS. 68-73. Early stages of the developing spermatozoon. Fig. 68 shows 

 the divided centrosome, the very beginning of the axial filament, and the 

 acrosome which had migrated to the anterior end of the nucleus or sperm-head; 

 Fig. 69 shows the posterior centrosome passing down the axial filament, and the 

 chromatoid body far down in the cytoplasm away from the filament; Fig. 70 shows 

 the same thing except that the chromatoid body is not present; Fig. 71 shows the 

 chromatoid body near the posterior centrosome; Fig. 72 shows what apparently 

 is the fusion of the chromatoid body with the posterior centrosome; and in Fig. 73 

 the chromatoid body is absent and the posterior centrosome is far down the axial 

 filament and so small that it can scarcely be detected. 



FIGS. 74 AND 75. Later stages of the developing spermatozoon showing the 

 chromatoid body in the cytoplasm at the posterior end. Fig. 74 shows the pos- 

 terior centrosome still on the filament, while Fig. 75 shows that it had been sloughed 

 off. 



