19 



is c on sideral)ly smaller, averaging 5.5^ broad "by 3 ^ 

 long, A similar decrease in the content of the nuclear 

 cavity has been noted by YAMAITOUCHI in Pol ysiphonia ('Oeb). 



At metai-ihase the group of cliroiao somes splits into two, 

 \/hich v/ithdra.v/ tov/ard the opposite poles of the spindle 

 (figs. 24-28), In anaphase the daughter cliromosomes of 

 each ga'^oup are seen to be arranged some\/hat in tlie sliape of 

 a v/atch crystal, with the concave surface tov/a,rd the pole 

 of the spindle (fig. 26), as v/as figiired in certain nuclear 

 divisions in ITemalion by TOLPE ('04). The tv/o groups of 

 chromosomes a,re connected hy a fev/ spindle fibres (fig. 26) 



As tJie daugliter groups of chromosomes approach the 

 kinoplasmic caps, the outlines of the individual chromo- 

 somes become lost in a dense mass of chromatin, v/hich is to 

 give rise to the nucleolus of the daughter nucleus (fig. 

 27) , At telophase the me-ss of cliromatin is in immedio-te 

 proximity v/ith the kinoplasmic cap. In the meantime the 

 nuclear membrane, v;hich becomes fainter during the coiirse 

 of mitosis, disappears, the origina.l nuclear cavity becom- 

 ing filled v/ith cytoplasm, only a few faint striae remain- 

 ing of the spindle (fig. 20) . The maas of cliromatin re- 

 sulting from each group of daugliter cliromosomes becomes 

 surrounded by a clear area, v/hich is bounded by a faint nu- 



