290 



two elements of the accessory chromosome represent the arms of the U 

 which have separated at the apex. It is of interest to note that neither 

 here nor in the spindle of the second maturation mitosis can centro- 

 somes or asters be definitely identified. 



The late telophase of the first maturation becomes the prophase of 

 the second maturation and represents a resting stage of the secondary 

 spermatocyte to the extent that a nuclear wall is reconstructed (Fig. 30) 



29 



Figs. 24, 25, 26 and 27. Metaphase and early anaphase of first maturation mi" 

 tosis, accessory chromosome is U-shaped and in advance of the ordinary chromosomes« 



Fig. 28. Late anaphase. 



Fig. 29. Telophase ; accessory bipartite. 



Fig. 30. Late telophase ; nuclear wall being reconstructed. 



Figs. 31, 32 and 33. Secondary spermatocytes in early prophase, each with ac- 

 cessory chromosome frequently bipartite. 



and that the tangled mass of chromosomes becomes diffused into a 



nuclear pale-staining reticulum with karyosomes among which lies the 



ong or bipartite accessory chromosome again close to the nuclear 



