Smallwood. — Maturation Hamiuea. 



PLATE 6. 



All figures except 32a magnified 1221 diameters. 



Fig. 30. Anaphase first maturation. Tiie centrosome of tlie forming polar cell 

 has disappeared. Two centrioles in deep centrosome. Chromosomes 

 arranged in the form of a ring. Iron haematoxylin. 



Figs. 31, 31a. Two successive sections showing prophase of second maturation. 

 Figure 31a represents the deeper section. Centrosomes faint. Cliromo- 

 somes at some distance from axis of nascent spindle. Brazilin. 



Fig. 32. Second maturation spindle assuming a radial position. Chromosomes 

 vesicular. Polar cell in the anaphase of division. Iron haematoxylin 

 and Bordeaux red. 



Fig. 32«. Polar cell of Figure 32 more highly enlarged. X 2448. 



Figs. 34, 30. The maturation spindle occupies a radial or nearly radial position. 

 The centrosome is dilTerentiated into centriole and centroplasm. The 

 chromosomes (Fig. 36) are dividing. Iron haematoxylin aud Bordeaux 

 red. 



Fig. 35. The second maturation spindle lies at right angles to the radius of the 

 egg. Centrosomes are elongated. Brazilin. 



Fig. 37. First polar cell abnormally large. There is an accessory chromosome 

 in the egg and another in the polar cell. Iron haematoxylin. 



