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 f.e. is seen a surface view of the follicular epithelium of an ovum. Zeiss C, ocul. 2. Picric acid.
Fig. 11. Section through part of an ovary of Scyllium 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 Scyllium canicula, 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.
Fig. 13. 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 Pl. 25]. 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. 2. Figs. 15, 16, 17, with Zeiss E, ocul. 2. Picric acid.
Plate 25.
List of Reference Letters.
do. Permanent ovum in the act of being formed. dyk. Developing yolk. fe. Follicular epithelium. fe´. Secondary follicular epithelium. gv. Germinal vesicle. nn. Nests of nuclei of ovarian region. o. Permanent ovum. pse. Pseudo-epithelium. str. Stroma ingrowths into ovarian epithelium. vt. Vitelline membrane. x. Modified nucleus. yk. Yolk (vitellus). zn. Zona radiata.
[Figs. 17 and 18. Vide description of Plate 24.].
Fig. 19. Two nuclei from a nest which appear to be in the act of division. From ovary of the same embryo as fig. 3.