Il 



Art. 6.— I. Ikeda and Y. Ozald : 



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IJI/J\\ 



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■^v 



Fig- ^^- meganuclear cliromatiii graaulcs visible there 



— in this figure the deeply lying plasmo- 

 somic granular mass is not represented. 

 They are nothing else, in our view, than 

 the three quarter- portions of the synkarion 

 above referred to and incorporated with the 

 meganucleus. We are not quite clear about 

 the true significance oî this fusion of the 

 three quarter-portions of the synkarion with 

 the old meganucleus, unless it be an indica- 

 tion of the physiological rejuvenescence or 

 reinforcement of the latter. As an indirect 

 evidence of the above view, it may be 

 pointed out that, as soon as the amalgama- 

 tion of the nuclei is over the ex-conjugant 

 begins to take food and grows a little larger, 

 while the renovated meganucleus returns to 

 its normal appearance, i.e., tlio state in 

 which the central granular mass expands 

 and occupies the whole interior of the nuclear membrane, and the 

 peripherally situated chromatin granules are lost to sight as such 

 and sink in between the plasmosomic granules. It is a highly 

 interesting fact that, in the first and second fissions which occur 

 after the conjugation and details of which will be given in the next 

 section, the three quarter-portions of the synkarion incorporated 

 with the meganucleus reappear in the dividing meganucleus (figs, 15 

 and 16, g. d. s y 1—3). This phenomenon never occurs in the ordi- 

 nary fission of the animal, and may therefore be said to be peculiar 

 to the first two fissions of ex-conjugants. 



An ex-con Jiigant just after 

 the conjugation. Iron- 



hsemoxylin. In the interior 

 of the meganucleus (K) there 

 exist the three quarter- 

 portions of the synlcarion 

 {g. d. syi-i). The plasmo- 

 somic granucles in the mega- 

 nucleus are not represented. 



