PLATE 4 



EXPLANATION OF FIGURES 



Side views of first spermatocyte complexes from eight individuals of form 

 "A.' Showing variation within the group. 



22 An animal showing hetermorphic condition of chromosomes number 11 

 and number 9. 



23 Homomorphic short armed form of chromosome number 9. 



24 Homomorphic long armed form of chromosome number 9 and heteromor- 

 phic form of chromosome number 11. 



25 Homomorphic telomitic form of chromosome number 9. 



500 



