PLATE 12 



EXPLANATION OF FIGURES 



Second spermatocyte metaphases from animal number 1 showing twelve 

 morphologically different types, as follows: 



Eleven chromosomes 



1. j, four V's plus seven rods. 



k, four V's plus six rods plus V of tetrad number 7 or 8. 

 I, four V's plus six rods plus V of tetrad number 1. 

 m, four V's plus five rods plus V's of numbers 1 and 7 or 8. 

 n, four V's plus five rods plus V's of numbers 7 and 8. 



0, four V's plus four rods plus V's of numbers 7 and 8. 



Twelve chromosomes 



p, five V's plus seven rods. 



q, five V's plus six rods plus V of tetrad number 7 or 8. 



r, five V's plus six rods plus V of tetrad number 1. 



s, five V's plus five rods plus V's of numbers 1 and 7 or 8. 



1, five V's plus five rods plus V's of numbers 7 and 8. 



u, five V's plus four rods plus V's of numbers 1, 7 and 8. 

 For first spermatocyte metaphases from this animal, see plate 1 and for sper- 

 matogonia plate 11, 1 1. 



516 



