658 L. R. Cary, 



Fig. 18. Segmentation nucleus in which the redistribution of the 

 nucleoplasm has begun, and in which the chromatin granules have increased 

 in size and are fusing to form the spireme thread. 



Fig. 19. Nucleus in which the spireme thread has been formed and 

 already extends beyond the circular mass of nucleoplasm. 



Fig. 20, 21, 22. Three successive stages in the growth of the 

 spireme and the redistribution of the nucleoplasm. 



Fig. 23. Nucleus containing fully formed spireme. 



Fig. 24. Nucleus in which the segmentation of the spireme to form 

 the chromosomes has been nearly completed before the redistribution of 

 the nucleoplasm has taken place. 



Fig. 25. Nucleus in which all of the chromosomes are distinct, but 

 still attached to one another by linin filaments. 



Fig. 26. Polar view of a nucleus in the metaphase. 



Fig. 27. Side view of a nucleus in which the chromosomes are being 

 arranged to form the equatorial plate. 



Fig. 28. Side view of a nucleus in the metaphase. 



Fig. 29. Side view of a nucleus in rather later anaphase to show the 

 beginning of the constriction of the nuclear membrane. 



Fig. 30. Cell in which the division of the nucleus is nearly completed. 



Fig. 31. Egg showing the characteristic shape of those which come 

 from the ovary in the sporocyst. 



Fig. 32. Egg showing fully formed spireme for the maturation 

 division. 



Fig. 33. Egg in a late prophase of the maturation mitosis, the 

 spireme thread has segmented to form the chromosomes, several of which 

 are distinctly shown as separate. 



Fig. 34. Side view of an egg at the metaphase of the maturation 

 division. 



Fig. 35. Section, in plane of the equatorial plate, through an egg 

 in the metaphase of the maturation di\dsiou. 



Fig. 36. Side view of an egg (which underwent its maturation while 

 free in the body cavity of the sporocyst), in an early anaphase of the 

 maturation division. 



Fig. 37. Side view of an egg in late anaphase. (Egg matured free 

 in body cavity of the sporocyst.) 



Fig. 38. Egg in early telophase of maturation division. 



Fig. 39. Late telophase of the maturation division. 



Pig. 40. Egg with attached polar body in which the chromosomes 

 are still distinct from one another after those in the egg have fused to 

 form the caryosome. 



Fig. 41. Egg with two polar bodies (?) attached. 



