10 Art. 6.— I. Ikeda and Y. Ozald: 



nuclei. In both the chromatin never concentrates, accordingly the 

 peripheral clear space inside the nuclear membrane does not appear. 

 The wandering nucleus shifts its position to the aboral end of the 

 body, i.e., to the point of adherence of the conjugants, and the 

 two corresponding nuclei (fig. 9, n.io.) stand side by side without 

 moving for a relatively long period. This seems to be due, in 

 part at least, to the slowness with which the plasmic fusion is 

 accomplished between the two conjugants. Unfortunately we have 

 not succeeded in directly observing the interchanging migration of 

 the wandering nuclei. But no doubt this really occurs, followed 

 by the coalescence of the immigrated nucleus with the stationary 



nucleus in each coniugant, as the 



Fig. lO. . 



result of which process the synkari- 

 . ' I / . on is formed (fig. 10, si).). This is 



!\ about twice as large as either of 



\ '' ' ^ J the two coalescing micronuclei, and 



.° ' ,'' « contains numerous chromatin threads 



^ ^-»^^ •>" , ' ,, which run on the whole parallel to 



\* ^ one another. Soon afterwards the 



^ chromatin threads condense and 



eventually become rearranged into 



'"- ' a single, moderately thick and con- 



Pig. 11. tinuous ring twisted in the manner 



' (L -4- c A ^ i 0^ tliö figure 8 (figs. 11, a). This 



/ ùt f- A 'A /IV ^^^° ^^^^ close to the nuclear mem- 



® '^ W ^ ^T^ ^^^^^- ^li^ ^^^i^^ synkarion now 



begins to elongate so as to acquire 

 the shape of a spindle ; in the meanwhile the 8-shaped chromatin 

 thread becomes discontinuous at one point and gives rise to a long 

 and irregularly coiled thread (fig. 11, b) which takes a central 

 position. This single chromatin thread divides twice transversely, 



