264 WALTON. 



PLATE 1. 



Figure 1. Spermatogonium showing intra-nuclear karj'ochondria {kchnd.). 



FiGHTiE 2. Earty spermatocj'te showing extra-nuclear distribution of karj'o- 

 chondria. 



Figure 3. Late prophase, first division, 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 

 c.ytoplasm. 



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

 vesicles' and the large plastochondria in the perinuclear space. 



