42 J. E. WODSEDALEK. 



PLATE II. 



FIG. 7. Resting stage of a primary spermatocyte showing the characteristic 

 heart-shaped nucleolus and the karyosomes from which radiate fine linin strands. 



FIG. 8. Primary spermatocyte showing a continuous network of chromatin 

 threads, some of which have paired and others are in the process of fusion, but most 

 of them are unpaired. 



FIG. 9. Primary spermatocyte showing a continuous network of chromatin 

 threads, an unusual number of which have fused; some are still unpaired while 

 others are in the process of fusing. 



FIG. 10. Primary spermatocyte in process of degeneration in the "spireme 

 stage." 



FIG. it. Primary spermatocyte in the late "spireme stage," showing signs of 

 paired and pairing threads, paired and single chromosomes, and also signs of 

 degeneration. 



FIG. 12. Late prophase of primary spermatocyte showing univalent and bi- 

 valent chromosomes, and one trivalent chromosome. Some of the univalent 

 components are still attached to each other at various angles. The accessory chro- 

 mosome is very distinct. 



