572 Theophilus s. Painter, 



Explanation of plates. 



Plate 30. 



Figs. 1 to 19 are from Maevia vittala, gray variety. Figs. 17, 18 

 and 19 are photomicrographs which have been drawn over as explained in 

 the text. Enlargement 2500:1. 



Fig. 1. Spermatogonia! prophase. 



Fig. 2. Side view of last spermatogonial spindle. 



Fig. 3. Equatorial view of spermatogonial division showing 28 chromo- 

 somes. 



Pig. 4. Equatorial view of spermatogonial division showing accessory 

 chromosomes A and ctetosomes C. 



Fig. 5. Last spermatogonial division seen from the side. 



Fig. 6. Telophase of the last spermatogonial division showing the 

 ctetosomes lagging behind in the spindle. 



Fig. 7. Same as above. 



Fig. 8. Spermatogonial telophase. 



Fig. 9. Same. 



Fig. 10. Spermatogonial telophase showing accessory chromosomes 

 lagging behind the autosomes. 



Fig. 11. Polar view of very late spermatogonial telophase. 



Fig. 12. "Rest period" stage. 



Fig. 13. Same showing four nucleoli. 



Fig. 14. Same showing four nucleoli. 



Fig. 15. Same as above. 



Fig. 16. Same showing three nucleoli. 



Fig. 17. Same showing two nucleoli. 



Fig. 18. Same. 



Fig. 19. Showing the nucleoli beginning to fuse. 



