414 WILLIAM A. nASWKLT-. 



Fig. 5. — Transverse section of cirrus, cu. Cuticle, with spinules. c.vi. 

 Layer of circularly arranged muscular fibres, l.m. Layer of longitudinal 

 muscular fibres, my. Layer of myoblasts. 



Fig. 6. — General view of the female reproductive apparatus as seen from 

 the ventral side. 



Fig. 7. — Dorsal view of the median part of the ovary and of the neigh- 

 bouring ducts. 



PLATE 23. 



Fig. 8. — From a series of longitudinal (horizontal) sections. Section 

 passing through swallowing apparatus, first part of oviduct and main vitelline 

 duct. X 450. 



Fig. 9. — From the same series. Section dorsal to that represented in 

 Fig. 8, showing vagina, receptaculum seminis, and shell-gland. X 450. 



Fig. 10. — From the same series. Section dorsal to that represented in 

 Fig. 9, showing receptaculum seminis and fertilising duct, x 450. 



Fig. 11. — From a series of transverse sections. Section passing through 

 swallowing apparatus and median part of ovary. 



Fig. 12. — Section immediately behind that represented in Fig. 11. 



Fig. ]3. — From an oblique series. Mouth of swallowing api)aratus. X GOO. 



Fig. 14. — From a transverse series. Showing swallowing apparatus and 

 its relations to ovary, x COO. 



Fig. 15. — From a transverse series. Showing relations of swallowing 

 apjiaratus to oviduct, x GOO. 



Fig. 16. — From a transverse series. Swallowing apparatus and oviduct. 

 X GOO. 



Fig. 17. — From a horizontal series. Section of oviduct at the point where 

 the ducts of the shell-gland open into it ; an ovum in the act of union with a 

 yolk-cell. 



Fig. 18. — Transverse section to siiow the relations of the primary uterus, 

 the vagina, and the ruptured secondary uterus. 



PLATE 24. 

 All the figures drawn under Zeiss's apoehromatic 2'0 mm. objective and 

 compensation ocular 12, magnifying 1100 diameters. 



Fig. 19. — Egg with unsegmented ovum. From preserved specimen. 

 Fig. 20. — Two-celled stage. Fresh specimen, showing the globules and 

 concentrically laminated bodies of the vitelline mass. 

 Fig. 21. — Two-celled stage. Preserved specimen. 



