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Fie. 63. ActinosphcenuTu eichhorni: first reduclioii-di vision, with centrosomcs 

 (tlic stages here shown follow those of the controsome-formation in Fig. 37). 

 A, Centrosome with radiations in a mass of archoplasm at one }>ole of the 

 nuclr'us ; B, two centrosomes and arclioplasmic cones, taking up positions 

 on opposite sides of the nucleus, in which chromosomes are beginning to appear ; 

 G. I), formation of the nuclear spindle and equatorial plate- of chromosomes ; 

 E, division of the equatorial plate ; F, division of the nucleus beginning ; 

 G, H, division of the nucleus and reconstitution of the danghter-nuclni ; one 

 daughter-nucleus will degenerate and be rejected as a reduction-nucleus ; 

 the neginniiiH of this is seen in //, where the upper darker daughter nucleus 

 is the one which degenerates. After Hcrtwig (64). 



