460 MINOT. 
EXPLANATION OF PLATE XXVIII. 
Fic. 8. Portion of a vertical section of the placenta at eleven days of a rabbit, to 
show the relations of the mesothelium, ms¢h, to the top, and of the ectoderm, ecéo, 
to the side of the placenta ( X 175 diams.). 
Fic. 9. Complete transverse section of a rabbit’s uterus at thirteen days, with the 
embryo, ed, in place ( X 7 diams.) ; the details are only approximately accurate ; 
x, mass of perivascular decidual cells, developed in the region of the ob-placenta. 
Fic. 12. Rabbit’s uterus at fifteen days; portion of a section through the placenta 
(X 90 diams.), to show the degenerated glands, ¢/, and the mesoderm, 7es, and meso- 
thelium, mst, covering the surface of the placenta; the blood-vessels are drawn 
dark. 
Fic. 13. Portion of upper part of a rabbit’s placenta at fifteen days ( Xx 340 
diams.), to show the histological structure of the glandular layer of the placenta. 
Fic. 14. Multinucleate decidual cells from the subglandular zone of a rabbit’s 
placenta at fifteen days ( X 540 diams.). 
Fic. 15. Uninucleate perivascular decidual cells from the outer zone of a rabbit’s 
placenta at fifteen days ( X 540 diams.). 
Fic. 16. Endothelium from the blood-vessels of the periplacenta of a rabbit at 
fifteen days ( X 240 diams.). A, surface view; B, C, in section. 
Fic. 17. Ob-placenta of a rabbit at fifteen days ( X 125 diams.), to show the 
monster cells, a, 4, c, and the uterine epithelium, ¢/. 
Fic. 18. Nucleus of a monster cell from the ob-placenta of a rabbit at fifteen 
days ( X 445 diams.). 
