IO8 EDWARD DRANE CRABB. 



PLATE 6. 



Each figure was drawn to the scale 0.02 mm. as shown. 



FIGS. 52, 58. First polocytes arranged according to their approximate 

 ages. Each was drawn from a single section having all the chromosomes 

 in it. 52-54, modified Flamming; 55, 56, 58, modified Burkhardt; 57, 

 modified Flemming 60 C. All were cut 6/* and stained with iron- 

 hsematoxylin. 



FIG. 59. A more detailed reproduction of the first polocyte shown in 

 Fig. 35- 



FIG. 60. An unusual anaphase of the second maturation division. From 

 the section adjoining Fig. 53. 



FIGS. 61-63. Anaphase of the second maturation division showing pro- 

 gressive changes in the centrosome of the egg nucleus correlated with the 

 movements of the daughter chromosomes. All chromosomes are from a 

 single section except in Fig. 62 the four lagging ones of the second polar 

 nucleus were transposed from the next section, as were those represented 

 as circles in 63. All eggs are from the same mass and the nucleus is com- 

 plete in each figure. Modified Burkhardt 50 C., 10 /", iron-hsematoxylin, 

 Gage's acid fuchsin. 



FIGS. 64-66. Primary spermatocytes. Fig. 64, modified Burkhardt, 6/*; 

 Fig. 65, Perenyi, 8 ^ ; Fig. 66, modified Flemming, 8 M, iron-hsematoxylin. 



FIGS. 67, 68. Secondary spermatocytes. Perenyi, 8 M, iron-hsematoxylin. 



