392 



ROBERT W. HEGNER 



H-V" 



^f^^r 



Mp 



Fig. 3 Miastor metraloas (redrawn from Kahle, '08). A section through 

 an egg showing a dividing polar body (p.b); cleavage nuclei i and iii undergoing 

 the chromatin-diminution process; and cleavage nucleus iv dividing normally. 

 The daughter nucleus of the latter which enters the 'polares Plasma' {p. PI) 

 becomes the nucleus of the primordial germ cell. 



Fig. 4 Miastor metraloas (redrawn from Kahle, '08). Five stages in the 

 second chromatin-diminution process. cMp, 'Chromosomenmittelplatte.' 



