PLATE 2 



EXPLANATION OF FIGURES 



7a Anaphase plate, first spermatocyte, containing nine autosomes. 



7b Anaphase plate, first spermatocyte, showing idiosome attached to the 

 end of one of the autosomes. 



8a Metaphase plate, second spermatocyte. Idiosome not present. 



8b Metaphase plate, second spermatocyte. Idiosome attached to the end 

 of one of the autosomes. 



9a Early anaphase, second spermatocyte, showing lagging division of the 

 heterochromosome. 



9b Late anaphase, second spermatocyte, showing lagging of the hetero- 

 chromosome. 



10a Telophase, second spermatocyte. Idiosome not present. 



10b Telophase, second spermatocyte. Idiosome attached to the end of one 

 of the autosomes. 



11 Late anaphase, second spermatocyte, showing idiosome free and lagging 

 in division. 



12 Spermatid, showing centrosome partially embedded in the nucleus. 



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