PLATE 3 



EXPLANATION OF FIGURES 



All figures in this plate were taken from the testis of Sceloperus spinosus. 



25 to 27 Equatorial plate views of spermatogonial divisions. 



28 to 30 Equatorial plate views of the first spermatocyte spindle. 



31 to 33 Side views of the first spermatocyte spindles, showing the early 

 migration of the X-chromosome to one pole of the cell. 



34 to 36 Equatorial plate views of second spermatocyte spindles, showing 

 either five or six large chromosomes. 



324 



