2O2 ROBERT H. BOWEN. 



PLATE II. 



All the figures are from Euschistus variolarius. The original preparation 

 was from material fixed in Benda's Flemming and stained with Fe-hemato::ylin. 



FIG. 7. Spermatogonial division (polar view) showing metaphase plate 

 with 28 chromosomes. 



FIG. 8. Primary spermatocyte in the later growth period. 



FIG. 9. Single tetrad from a tetraploid spermatocyte nucleus in the late 

 prophase. 



FIG. 10. First spermatocyte divison ; lateral view. 



FIGS, ii and 12. Early and late stages in the metaphase (approximately) 

 of the first spermatocyte divison ; polar view. 



