Bigelow. — Nuclear Cycle of Gonionemus murbachii. 



Fig. 86. Late anaphase. The chromosomes are densely massed. The centro- 

 somes persist. 



Fig. 87. Telophase. The chromatin forms a dense network. The centrosomes 

 are still visible. 



Fig. 88. A pair of daughter spermatids, still connected by the interzonal filaments. 

 The preparation has been crushed, so as to partly separate the fila- 

 ments. The centrosomes are prominent ; and there is a short filament 

 attached to the centrosome of the left-hand cell. 



Fig. 89. Fair of spermatids, slightly later stage. 



Fig. 90. A spermatid. The interzonal bridge has now broken down, and the 

 polar remnants have become metamorphosed into a spherical archo- 

 plasmic mass. The cytoplasm contains several deeply stained granules. 



Fig. 91. Spermatid shortly after the breaking down of the interzonal bridge. 



