144 ALICE M. BORING. 



EXPLANATION OF PLATE III. (Philcenus spitmariiis). 



FIG. 19. Equatorial plate of a spermatogonium, 23 chromosomes, 2 largest 

 (A A) and 4 next in size (BB, CC). 



FIGS. 20-22. Male somatic cells, 23 chromosomes, size relations the same as 

 in Fig. 19. 



FIG. 23. Equatorial plate of an oogonium, 24 chromosomes, same size relations 

 as in Fig. 19. 



FIGS. 24, 25. Female somatic cells, 24 chromosomes, same size relations as in 

 Fig. 19. 



