Plate III. 



( Oogenesis continued. ) 



Figs. 91-93. Metaphase of 1° maturation; the chromosomes 

 nearly all converted into elongated rods. 



Figs. 94-95 {a and /^). Early anaphase of the same showing the 

 elongation of the chromosomes and the chromosomal strand con- 

 necting the dyads. 



Fig. 96. Prophase of second maturation showing the newly formed 

 spindle inclined 90° to the foregoing ; also, the first polar body. 



Fig. 97. Somewhat later prophase with spindle revolved into 

 proper radial axis. 



Fig. 98. Metaphase of 2° maturation division showing longitudi- 

 nal division of dyads. 



Figs. 99-100. Anaphase and telophase, respectively, of the same. 



Fig. 10 1. Later telophase of 2° maturation division ; formation of 

 second polar body. 



Fig. 102. Division of i° polar body in metaphase showing some 

 character of chromosomes as in second maturation within Qgg. 



Fig. 103. Cross section of metaphase in division of a 'Miver- 

 cell " ; V-shaped chromosomes as in the early generations of oogonia 

 and spermatogonia. 



Fig. 104. Telophase of atrium cell showing the presence of the 

 unreduced number of the V-shaped chromosomes in contrast with the 

 reduced number of such structures in the telophases of the last gen- 

 eration of spermatogonia and oogonia Figs. 18 and 66. 



Fig. 105. Prophase of division in atrium cell showing both the 

 V and ring chromosomes. 



Fig. 106. Fusion of the male and female pro-nuclei, the latter 

 being nearer the tgg periphery. The chromosomes are concentrat- 

 ing from the earlier reticulum to the definite V-shaped chromosomes 

 of the 1° somatic division. 



Fig. 107. 1° somatic mitosis, prophase showing twenty-two V- 

 chromosomes. 



Fig. 108-109. Metaphase and anaphase of the same. 



(64) 



