102 



C. M. CHILD. 



The posterior portion of the disc -like proliferating area which 

 terminates the oviduct at the stage of Fig. 4 is indistinguishable 

 from other parts in the earlier stages but in the later stages shows 

 smaller cells and smaller follicles than the ovary and forms the 

 vitellarium. It is not shown in Fig. 6. 



FIG. 6. 



After the development of the ovary is completed nuclear di- 

 vision ceases and the mother cells enter upon the first stage of 

 their development as ova. As long as division continues, how- 

 ever, it is predominantly amitotic. The following figures taken 

 from various stages between the formation of the ovary and the 

 completion of its development in both species will show very 

 clearly the prevalence of this process. 



During the growth of the ovary the parenchymal substance 

 remaining within the ovary gradually disappears. In many 

 cases, especially after chrom-oxalic, the cytoplasmic areas about 

 the nuclei are indistinct. The cytoplasm is usually not sharply 

 marked off from the parenchymal substance still present so that 

 the whole often appears as a syncytium. After sublimate fixa- 

 tion the cytoplasmic regions appear more distinct. Most of the 

 figures are drawn from sublimate preparations. 



Fig. 7 is from a stage slightly later than Fig. 5, before the 

 separate follicles have appeared and before an ovarian membrane 

 has formed. The width of the figure represents the whole 



