PLATE 9 



EXPLANATION OF FIGURES 



Side views of seven first spermatocyte metaphases. form 'B." 



62 This individual has the least number of atelomitic chromosomes found. 

 Seven in the spermatogocia. resulting in three rings of the Stenobothrus type 

 and the usual atelomitic accessory in the first spermatocyte. Xote the very 

 large supernumerary. 



63 An early anaphase — chromosome number i cut. 



63a' Spermatogonia! metaphase with chromosomes arranged in pairs. From 

 same animal as 63. Xote the very close resemblance to the first spermatocyte 

 anaphase especially, chromosome number 8, one homologue of which is con- 

 stricted in each, and chromosome number 7. one homologue of which is atelomitic 

 in both cas - 



For the four classes of second spermatocytes formed by this individual, see 

 plate 13. 636 to e. 



510 



