PLATE 5 



EXPLANATION OF FIGURES 



89 Sarcophaga sp., diploid, late prophase, ovarian follicle cell. 



90 Same, somatic, small pair is XX pair in these figures. 



91 Same, somatic, earlier prophase, two sections of one nucleus. 



92 and 93 Same, slightly later prophase, entire nuclei. 



94 Same, later stage. 



95 Same, somatic, anaphase, side view showing both groups of daughter 

 chromosomes; note the closely paired association. 



96 Same, tetraploid metaphase; four small chromosomes are X chromosomes, 

 from ovarian follicle cell. 



97 Same, multiple group, somatic, apparently containing 48 chromosomes. 



98 Ravinia peniculata, diploid, metaphase, ovarian cell. 



99 Same, slightly later, ovarian follicle cell, showing splitting of chromo- 

 somes. 



100 Homalomya sp., diploid, somatic, very early prophase showing bivalent 

 threads, nucleus practically entire; note the polarization. 



272 



