264 



WALTON. 



PLATE 1. 



Figure 1. Spermatogonium showing intra-nuclear karyochondria (kchnd.). 



FiGUBE 2. Early spermatocyte showing extra-nuclear distribution of karyo- 

 chondria. 



Figure 3. Late prophase, first di\'ision, showing refringent granules (vs.rfr.) 

 developed from karyochondria. 



Figure 4. Anaphase, first division, showing radial arrangement of 'refrin- 

 gent vesicles ' {vs. rfr.). 



Figure 5. Prophase, second division, showing extreme elongation of 'refrin- 

 gent vesicles ' and their contained plastochondrial, granular rods 

 (plstchnd.). 



Figure 6. Anaphase, second division, showing peripheral position of 'refrin- 

 gent vesicles ' and also the plastochondria, now lying free in the 

 cytoplasm. 



Figure 7. Early spermatid, showing peripheral position of 'refringent 

 vesicles' and the large plastochondria in the perinuclear space. 



