Smallwood. — Maturation Haminea. 



PLATE 10. 



All figures photographic reproductions of sections magnified 670 diameters, and 

 in reproduction reduced to about 450 diameters. 



Figs. 65, 66. The central spindle passes tlirough the germinative vesicle. The 

 chromatin exists in the form of chromosome vesicles. Taken from the 

 ovotestis. Iron haematoxylin and Bordeaux red. (Compare Plate 2, 

 Fig. 9.) 



Fig. 67. Outline of germinative vesicle has disappeared. Chromosomes lie free 

 in equatorial plane of spindle. Granules of cytoplasm arranged in 

 rows about spindle poles. Taken from ovotestis. (Compare Plate 3, 

 Fig. 13.) 



Fig. 68. Metaphase of first maturation. Tiie sphere-substance is differentiated into 

 a light-colored medullary and a more deeply staining cortical layer. 

 Mitotic figure moving peripherally. Iron hematoxylin and Bordeaux 

 red. (Compare Plate 6, Fig. 26.) 



Fig. 69. Anaphase of first maturation, shorter or direct process. Iron haematoxy- 

 lin. (Compare Plate 0, Fig. .30.) 



Figs. 70, 71. Unusually large first polar cell, in mitosis. Egg in the beginning ana- 

 phase. The focus in Figure 71 is such as to show the spindle in the 

 polar cell, but not in the egg. (Compare Plate 6, Fig. 37.) Iron 

 haiuiatoxylin. 



Fig. 72. Metaphase of first maturation. Two centrioles in deep centrosome. 

 Chromosomes partly enclosed in a nuclear wall. Iron haematoxylin. 

 (Compare Plate 7, Fig. 38.) 



