16 



Art. 6.— I. Ikeda and Y. Oziiki : 



these cannot be anything else than the three grand-daughter syn- 

 karions which were taken up by the persisting meganucleus. 



The meganuck^us now begins to divide by simple constriction 

 at the two clear spaces between the three granular masses. The 

 result of the division: three meganuclei of a spherical shape and 

 approximately uniform size, are simultaneously produced each in- 

 cluding, besides its own small chromatin as well as plasraosomie 

 granules, one of the three large chromatin masses derived from 



Fig. 16 



Fig. 17. 



\N 



.?t 





cL'f 





ci^'r 



?z^ 



» 'Jk. 



k 



■^-. 





the original synkarion (see fig. IG). After this trinal division of 

 the meganucleus, tlie oblique transverse binary fission of the ex- 

 conjugant commences. As to the morphological changes which 

 the cytoplasmic structures undergo during this fission, there is an 

 essential agreement with those taking place in the ordinary binary 

 fission of the species (see later) and also with those described by 

 Stevens in Boveria suhcyUndrica, so that their full description 

 may here be dispensed with. Only one peculiar feature may be 

 pointed out, viz., the fact that in the first binary fission of the 

 ex-conjugant, one of the three newly arisen meganuclei passes 

 over into the lower individual, while the other two go to the upper 



