16 FOOT. 
EXPLANATION OF PLATEI. 
All figures were drawn from sections; in all but three cases the entire figure 
was drawn from a single section. 
Zeiss. hom. immer., 2mm., 140 ap. 
Abbe Camera. 
Figs. 1-5, ocular IV. 
Figs. 6-12, ocular II. 
Figs. 13-14, ocular IV. 
Stains, lithium carmine and Lyon’s blue. 
Archoplasm (‘“ yolk-nucleus,” “archoplasm,” polar rings), blue. 
Chromatin, nucleolus, and cytoplasm, red. 
Fic. 1. Very young oocyte, p. 4. 
Fic. 2. Older odcyte, p. 5. 
Fic. 3. Later stage, p. 6. 
Fic. 4. Archoplasm dispersed in irregular patches throughout the oocyte, p. 6. 
Fic. 5. Archoplasm peripherally distributed, p. 6. 
Fic. 6. Egg detached from free end of ovary (section through germinal 
vesicle), p. 6. 
Fic. 7. Egg taken from freshly-laid cocoon, showing longitudinal section 
through first maturation spindle, p. 8. 
Fic. 8. Fertilized egg. Transverse section through the fertilization cone, p.8. 
Fic. 9. Longitudinal section through fertilization cone, p. 9. 
Fic. 10. Egg after formation of first polar body (archoplasm in polar body). 
Figure drawn from three sections, p. 9. 
Fic. 11. Egg after second polar body has been formed (the polar bodies not 
represented), p. 10. 
Fic. 12. Egg in pronuclear stage; archoplasm aggregated at the poles as 
polar rings, and concentrated around the pronuclei (only one of which is 
represented), p. Io. 
Fic. 13. Later stage; chromatin in form of loops, p. 11. 
Fic. 14. Transverse section of one polar ring, egg in pronuclear stage, p. 11. 
