880 DR FOULIS ON THE DEVELOPMENT OF THE OVA, ETC. 
EXPLANATION OF PLATES. 
In these plates the same letters have been employed to mark corresponding structures in the 
whole series of figures. 
. The parenchyma of the ovary. 
. The fibro-vascular peduncle or stalk of the ovary. 
. The lower border of the ovary at the hilum. 
. The layer of epithelium on the stalk of the ovary. 
. The layer of epithelium stripped off from the stalk, and seen from a surface view. 
. Peritoneal epithelial corpuscles. 
. Corpuscles intermediate between peritoneal and germ epithelial corpuscles. 
. Germ epithelial corpuscles. 
. Corpuscles from the surface of adult ovary. 
Fusiform shaped corpuscles among germ epithelial corpuscles. 
Connective-tissue stroma of the ovary. 
. Blood-vessels. 
. Large spherical germ epithelial corpuscles, 
. Primordial ova. 
. Fusiform corpuscles in contact with the yelk-substance of the primordial ova. 
. Large egg clusters. 
. Tubiform depressions of the surface of the ovary. 
Small groups of germ epithelial corpuscles being included in the stroma of the ovary. 
The membrana granulosa. 
. The zona pellucida. 
. The yelk substance of the nearly mature ovum. 
. Individual corpuscles of the membrana granulosa, showing the nucleus surrounded with a con- 
siderable quantity of protoplasm. 
v. Division of the nuclei of the corpuscles of the membrana granulosa. 
fe sae sso 8 Soka Seay eas os 
Pratt XXVIII. 
Figure 1. Vertical section through the ovary of a fcetal calf, about 9 inches long, showing the paren- 
chyma (a) and the fibro-vascular stalk or peduncle (0) prolonged into the ovary at the 
hilum (¢). On the surface of the peduncle is a layer of epithelium (d). (Page 349.) 
. Surface view of this layer of epithelium. (Page 349.) 
. Profile view of the same layer of epithelium, showing the gradual change of peritoneal 
epithelial corpuscles (7) into germ epithelial corpuscles (2). (Page 350.) 
Figure 4. The parenchyma of the fcetal calf’s ovary, showing the germ epithelial corpuscles (#) and 
the growth of delicate connective-tissue of the stroma (j) and blood-vessels (&) among 
the corpuscles below the germ epithelium. (Page 350.) 
Figure 5. A portion of the fibro-vascular zone of the fcetal calf’s ovary, showing a primordial ovum 
(m), surrounded with a wreath of small corpuscles, outside of which are blood-vessels 
(k) and young connective-tissue. (Page 351.) 
Figure 6. Portion of the ovary of a kitten about three weeks old, showing the germ epithelium (h), 
large spherical germ epithelial corpuscles (7), and primordial ova (m.) In contact with 
the yelk substance of these primordial ova are fusiform corpuscles (7). Bundles of 
young connective-tissue (7) are seen growing upwards, between, and around large egg 
clusters (0), situated immediately below the germ epithelium. (Page 352.) 
Figure 7. Semidiagrammatic drawing of the ovary of a human fetus of 74 months, showing the 
parenchyma (a), and the fibro-vascular peduncle (6), prolonged into the ovary at the 
hilum (c). From the peduncle the whole stroma of the ovary is derived. The germ 
epithelium (f) rests on the youngest connective-tissue, which is part of the stroma, and 
is the forerunner of the tunica albugines. (Page 357.) 
Figure 
Figure 
oo bo 
Puate XXVIII. 
Figure 8. Section of a human fcetal ovary of 74 months, seen under a low magnifying power, show- 
ing the stalk or peduncle (0), the parenchyma of the ovary (a), and the lower border 
of the ovary (c). 

