I AN \\ \ I i<>\ OJ PLAT] 25.. 



bate the relation of tl epithelium to the subjacent vascul 1 -<* A, 



ocul. 2. ' n.il epithe- 



lium. 



lection through ' ilryi <.f .S/ ;///. 



lightly older th !'> illustrate tin- relation of the ovarian epithelium to the 



subjacent V.IM ular Mrom.i. X.eUs A, ocul. 2. 



;. More highly magnified portion of ' 

 the same points. Zeiss C, ocul. 2. (' 



S. Section through tin- ... e it is 



very small) from a young female of Si}', canicnl . acid. It 



>hews the vascular ingrowths among-,! the original epithelial cells of the ovarian 



region. 



Fig. 9. Section through the ovarian region of the same embryo as tig. 8, at its 

 point of maximum development Xeis^ A, ocul. 2. /'. 



Fig. 10. Section through superficial part of the ovary of an embryo, shewing 

 the pseudo-epithelium ; the cells of which are provided with tails prolonged into the 

 general tissue of the ovary. At/, e. is seen a surface view of the follicular epithelium 

 of an ovum. Zeiss C, ocul. i. Picric acid. 



Fig. ir. Section through part of an ovary of Scy Ilium canicula of stage Q, with 

 three primitive ova, the most superficial one containing a modified nucleus. 



Fig. 12. Section through part of an ovary of an example of Scylliutn cam'cu/a, 

 8 cm. long.' The section passes through a nest of ova with modified nuclei, in which 

 the outlines of the individual ova are quite distinct. Zeiss E, ocul. 2. Picric acid. 



I'ig- T 3- Section through part of ovary of the same embryo as in fig. 5. The 

 section passes through a nest of nuclei, with at the least two developing ova, and also 

 through one already formed permanent ovum. Zeiss E, ocul. 2. Osmic acid. 



Figs. 14, 15, 16, 17, 18 [Figs. 17 and 18 are on PI. 15]. Sections through parts 

 of the ovary of the same embryo as fig. 3, with nests of nuclei and a permanent ova 

 in the act of formation. Fig. 14 is drawn with Zeiss D D, ocul. 7. Figs. 15, 16, 

 17, with Zeiss E, ocul. 2. Picric acid. 



1'IATK 25. 



LIST OF Ki 



do. Permanent ovum in the act of being formed, dyk. Developing yolk. ft. 

 Follicular epithelium. _/Y. Secondary follicular epithelium, g v. Gcrmi: 

 // //. Nests of nuclei of ovarian region, o. Permanent ovum. fs c \ iv-udo-epithelium. 

 str. Stroma ingrowths into ovarian epithelium. :/. Yitelline membrane, jr. Modified 

 nucleus, yk. Yolk (vitcllus). z n. Zona radiata. 



[Figs. 17 and 18. Vide description of 1'l.r 



Fig. 19. Two nuclei from a nest which appear to be in the act of division. From 



ovary of the same eml'iyo a.-, tig. 3. 



Fig. 20. Section through part of an ovary of the same embryo as fig. 6, or 



ing a nest of nuclei. ul. :. O 



