474 ELMER L. SHAFFER. 



PLATE IX. (Fics. 82 TO 87). 



FIG. 82. Oocyte with its egg-string, from ovaries fixed in Bouin's fluid 15 

 hours showing the complete disappearance of mitochondria. 



FIGS. 83, 84. Oocytes from Flemming fixed material showing characteristic 

 arrangement of mitochondria in a perinuclear zone sharply delimited from the 

 rest of the cytoplasm. 



FIG. 85. Oocyte at the period when the cytoplasmic volume has reached its 

 maximum. The mitochondria still surround the nucleus, but the zone is not so 

 sharply delimited. Shrinkage of the nucleus away from the cytoplasm shows the 

 nuclear membrane to be intact. 



FIG. 86. Older oocyte in which perinuclear arrangement of mitochondria is 

 lost, the granules becoming scattered toward the periphery of the cytoplasm. 



FIG. 87. Typical germinal vesicle of almost mature oocyte, showing two 

 chromatic nucleoli. 



