328 



GAEY N. CALKINS 



the larger, pale granules. With this new nuclear complex, viz., 

 one ghost-like new macronucleus ('placenta'), one degenerating 

 micronucleus, and two functional micronuclei, the conjugating 

 individuals separate (figs. 79, 80, and 86). 



Fig. 76 Pair with pronuclei in each individual about to fu?e. X 800. 



Fig. 77 Initial stage of fusion of the pronuclei. X 1500. 



Fig. 78 Elongation to spindle form of the fusing pronuclei. X 1500. 



TV. THE EX-CONJUGANT 



Separation of the conjugating individuals begins at the pos- 

 terior part of the fused regions, progress in separation being 

 marked by the increasing length of the free peristomes (figs. 79 

 and 80). Finally, a connection remains only at the frontal mar- 

 gin*, and the two cells pull apart. For a few seconds, only, they 

 remain quiet, but within a few minutes their activities are fully 

 restored. 



