74 PROCEEDINGS OF THE AMERICAN ACADEMY. 



cult to determine the fate of the chromosomes and spindle fibres at 

 this time. The former appear to be aggregated to a greater or less 

 extent, and their individuality seems thereby to be obscured. 



After the formation of the non-nucleated " Kichtungskorper " the 

 chromatin is found to occupy the equator of the spindle, where it has 

 regained the appearance of more or less distinct chromosomes. Thus 

 is formed a fairly characteristic spindle figure in the metaphase 

 (Figure 5). Division of the chromosomes now takes place, and the 

 daughter chromosomes migrate toward the poles of the spindle, leav- 

 ing stretched between them interzonal filaments (Figure 6). As the 

 cell enters on the telophase it elongates, and a constriction is then 

 formed at the equator (Figure 7). The constricting process is con- 

 tinued until the daughter cells remain connected to each other by only 

 an attenuated neck of cytoplasm, through which can be traced the 

 interzonal filaments. There result two spermatids, both apparently 

 destined to become functional spermatozoa, for these cells, unlike the 

 corresponding cells of the honey bee, are equal in size ; they are imme- 

 diately metamorphosed into spermatozoa. 



Bibliography 



Mark, E. L., and Copeland, M. 



: 06. Some Stages in the Spermatogenesis of the honey bee. Proc. Amer. 

 Acad. Arts and Sci., Vol. 42, No. 5, pp. 103-111," 1 pi. 



Meves, F. 



: 03. Ueber " Richtungskbrperbildung " im Iloden von Ilyraenopteren. 

 Anat. Anz., Bd. 24, pp. 20-32, 8 Fig. 



