ELMER L. SHAFFER. 



PLATE VI. (Fics. 44 TO 48). 



FIG. 44. Portion of nucleus (nd.) and cytoplasm (cy.) of oocyte showing migra- 

 tion of mitochondria from perinuclear region toward the periphery of the cell. 

 X 1,200. 



FIG. 45. Ingestion of nurse-cells by upper end of egg-string (e.s.). Products 

 of ingestion are seen passing down egg-string into cytoplasm of oocyte. Note 

 perinuclear arrangement of mitochondria. 



FIG. 46. Germinal vesicle of old oocyte showing plasmosome (pi.) and several 

 chromatic nucleoli. X 800. 



FIG. 47. Portion of oocyte and its follicle. Mitochondria arranged in periphery 

 of cytoplasm. Persistence of egg-string. X 600. 



FIG. 48. Stages in the transformation of mitochondria into yolk-sperules. 



