PLATE 6 
EXPLANATION OF FIGURES 
Metamorphosis of the spermatids—Continued 
64 and 65 Elongation of the spherical nucleus and extranuclear body, to form 
the typical head and cytoplasmic-like body shown in figure 66. 
66 to 72 Further transformation of the spermatid into the spermatozoan, 
showing method of elongation, disappearance of the neck plate and cytoplasmic 
body, and the diffusion of the chromatin. Migration of the two unknown chro- 
matin-staining bodies to the anterior end of the spermatozoan, resulting in the 
production of a long, granular fiber (figs. 69 and 70) from the plate-like middle 
piece (fig. 66). 
73 Mature spermatozoan showing the ‘false’ head. The true head consti- 
tutes, perhaps, the entire drawing, the tail being many times longer than the 
illustration. 
Somatic mitosis 
74 <A resting somatic cell. All somatic figures are from ovarian follicles. 
75 Side view of a metaphase spindle. 
76 Metaphase plate—twenty-four chromosomes. 
77 An exceptional anaphase. 
78 and 79 Early telophases. 
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