1901.] NATURAL SCIENCES OF PHILADELPHIA. 271 



Figs. 12, 13. — Fdetn, nuclei in prophases of first maturation mitosis. 



Fig. 14. — Idem, pole view of monaster stage of first maturation mitosis. 



Figs. 15, 16. — Idem, lateral views of melakinesis of first maturation mi- 

 tosis. 



Fig. 17. — Idem, pole view of one plate of daughter chromosomes, early 

 anaphase of first maturation mitosis. 



Fig. 18. — Corizus alternatus, pole view of monaster stage of a spermato- 

 gonium. 



Fig. 19. — Idem, nucleus of first spermatocyte, rest stage. 



Fig. 20. — Idem, pole view of monaster stage of first maturation mitosis. 



Fig. 21. — Idem, lateral view of the same stage. 



Figs. 22, 23. — Harmostes reflexuliis var., pole views of monaster stage of 

 spermatogonia. 



