58 
ANIMAL PHYSIOLOGY. 
(tunica fibrosa), in close relation to which is a layer of capillary 
blood-vessels (tunica vasculosa), the two together forming the 
Fic. 62.—Sagittal section of the ovary of an adult bitch (after walacyer o. e, ovarian epi- 
thelium ; 0. f, ovarian tubes; y. f, younger follicles ; o. f, older follicle ; d. p, diseus pro- 
ligerus, with the ovum ; e, epithelium of a second ovum in the same follicle ; /. c, fibrous 
coat of the follicle ; p. c, proper coat of the follicle; e.f, epithelium of the follicle (mem- 
brana granulosa) ; a. f, collapsed atrophied follicle ; b. v, blood-vessels ; c. t, cell-tubes of 
the parovarium, divided longitudinally and transversely ; ¢.d, tubular depression of the 
ovarian epithelium, in the tissue of the ovary ; b. e, beginning of the ovarian epithelium, 
close to the lower border of the ovary. 
general covering (tunica propria) for the more delicate and im- 
portant cells within. Lining the tunic is a layer of small, some- 
what cubical cells (membrana granulosa), which at one part 
invest the ovum several layers deep (discus proligerus), while 
the remainder of the space is filled by a fluid (liquor follicult) 
probably either secreted by the cells themselves, or resulting 
from the disintegration of some of them, or both. 
