1112 



THE REPRODUCTIVE ORGANS 



and collect liere in groups, finally evoking the formation of a daughter-nucleus. 

 As they diverge, the zone between them shows a bundle of achromatic connecting 

 fibers which are not identical with the fibers of the original spindle. Later on in 



A 



B 



C JD 



Fig. 530. — The Prophases of Mitosis (Heterotypical Form) in Primary Spermato- 

 cytes OF Salamandra. 

 A, Early segmented spireme; two centrosomes outside the nucleus in the remains of 

 the attraction-sphere. B, longitudinal splitting of the spireme, appearance of the 

 astral rays, disintegration of the sphere. C, early amphiaster and central spindle. 

 Z), chromosomes in the form of rings, nuclear membrane disappeared, amphiaster en- 

 larging, mantle-fibers developing. {Meves.) 



the course of the anaphase and during the telophase, the entire cell splits into two 

 portions, each of the daughter-cells receiving a group of chromosomes, half of the 

 spindle and connecting fibers and an aster with its centrosome. Meanwhile, the 

 nucleus of the daughter-cell has been reconstructed. . 



