460 



7^^. M. Stevens 



pole of the first division spindle, one to each pole, or one or both 

 may divide as in Fig. 54. The resulting combinations in the 

 spermatozoa are as follows: 



Equal numbers 



I \() + s 

 9 + 2J- 



van 



iabl 



e numbers. 



f 9 + ^ 



II <{ 9 + X + J- 

 9 + X' + 2J- 



variable numbers. 



Type lie 



Three out of the same 100 specimens had three small hetero- 

 chromosomes, as shown in Fig. 56, a growth stage, 57 and 58, 

 metaphases of the first division. 



Type lid 



One individual had four such small heterochromosomes which 

 may be seen in Figs. 59-65, growth stages and first spermatocytes. 

 Here one may find all of the possibilities with respect to division 

 and distribution of the small chromosomes. The possible com- 

 binations in the spermatozoa are therefore as follows: 



\ 



Equal numbers 



II 



variable numbers. 



variable numbers. 



