234 FRANK A. HARTMAN. 



PLATE II. 



FIGS. 25 to 32 inclusive. Polar views of chromosomes in first spermatocyte 

 metaphase. 



FIGS. 33 to 47 inclusive. Polar views of first spermatocyte anaphase. 



Scheme of lettering and numbering as in Plate I., w 5 and w 6 being from animals 

 not represented in Plate I. 



The greater size of the chromosomes of adults more pronounced than in Plate I. 



In both metaphase and anaphase the variation in size, between corresponding 

 chromosomes of the same animal, is evident. 



