NOTES ON THE HISTKIOE.DEIJHDT:. 
225 
Figs. 7-12. — Transv^erse sections of a mature female specimen of S. 
nov'a3-hollandi0e. X 1)00. The cilia of the enteric epithelium are 
not represented. 
Fig. 7. — Section a little distance in front of the anterior end of the 
ovary with the posterior parts of the second pair of nephridia the 
vitelline glands and the obliquely running longitudinal bands of coelen- 
chynie. 
Fig. 8. — Section through the anterior part of the ovary with the loops 
of the third pair of nephridia (a‘‘.) on the dorsal side of the ovary and 
the ventral side of the stomach. 
Fig. 9. — Section immediately following that represented in fig. 8, with 
vertical septa enclosing a median space in which are the nerve-cord and 
the bends of the loops of the third pair of nephridia (a.^), which almost 
meet in the middle line. 
Fig. 10. — Section passing through about the middle of the large ovum. 
Fig. 11. — Section passing through one of the cirri of the third pair, 
and on the other side passing through the funnel or cushion (ca.) and 
the shell-gland secretion {sh.) in the neighbourhood of the genital 
aperture. 
Fig. 12. — Section a little further back comprising the thickenings of 
the septum (s.*) behind the large ovum, shell-gland secretion (sh.) and 
the genital aperture ( $ ). 
PLATE 13. 
Fig. 13. — Transverse (slightly oblique) section through the head 
region at the bases of the anterior limbs. X 600. 
Fig. 14. — Part of a transverse section from another series passing 
through the external genital aperture ( $ ), shell-glands (sh.gld.), ciliated 
cushion (cu.). with the large ovum (o.^) and the thickening of the septum 
(sd) behind it. X 500. 
Fig. 15. — Section through the caudal region showing the relations of 
the ccelenchyme. X 600. 
Fig. 16. — Anterior plates of lower jaw in S. tasmanicus. x 2400 
Fig. 17. — Anterior plates of lower jaw of S. nov0e-liollandia3. x 
240(t 
Fig. 18. — Cirrus of posterior limb of S. no vse-hollandiie. 
Fig. 19. — Cirrus of posterior limb of S. tasmanicus. 
Figs. 20-22. — Penis in S. novse-hollandiaj. 
Figs. 23-25. — Penis in S. tasmanicus. 
