368 J. T. PATTERSON. 



PLATE IV. 



FIG. 19. A and B longitudinal sections of two polygerms lying close together 

 in the same caterpillar. These polygerms show an early phase of the segregation 

 of the embryonic nuclei to form the separate embryos. X 489. 



FIG. 20. Section of an egg of Gnorimoschema which has started to develop 

 parthenogenetically. X 173. 



FIG. 21. Longitudinal section of a polygerm showing the end phase of embryo 

 formation. X 480. 



