PLATE 2 



EXPLANATION OF FIGURES 



7 Nucleus of an immature egg, with the adjacent cytoplasm. Does not 

 contain any chromatic substance; large chromatic bodies lying in the cytoplasm. 



8 Nucleus of a parthenogenetic egg after remaining 10 minutes in sea-water. 

 Small chromatic granules outside and inside of the nuclei. 



9 and 12 Nuclei of parthenogenetic eggs after remaining 15 minutes in sea- 

 water. Many small chromatic granules adjacent to the nuclear membrane and 

 similar chromatic granules in the cytoplasm. Figure 12 shows a condensation 

 of cytoplasm, impregnated by a basophilic substance. 



10 Nucleus of a parthenogenetic egg after remaining 20 minutes in sea-water. 

 A large chromatic body within the nucleus, directly connected with the cyto- 

 plasm, whose threads and meshes are impregnated by a basophilic substance. 



11 .and 13 Nuclei of parthenogenetic eggs after remaining 35 minutes in sea- 

 water. 



11 Chromatic impregnation of the cytoplasm around the nucleus; develop- 

 ment of the chromatin net within the nucleus. 



13 Nucleoli; numerous small chromatin granules within the nucleus at its 

 periphery; many small chromatic granules in the cytoplasm around the nucleus, 

 partly connected with the granules lying in the nucleus. 



596 



