On the K>ner*tive Organs and PruducU of Toniopteris onisciformis E. 445 



Fig. 4. Similar section (in part) of a ripe male with genital 

 rolls three to four layers in thickness. Zeiss Oc. 8, Homog. 2 mm. 



Fig. "). Portion of a ripe male behind the 13"' body-segment to 

 the end of the tail showing the paired seminal vesicles in the 14"* — 17 "• 

 ^«•gments. Zeiss Oc. 4, Apo. IG mm. 



Fig. <i a — e. Five seminal vesicles, showing differences in shape 

 ;iiid size, from a ripe male. Zeiss Oc. 8, Apo. 10 mm. 



Fig. 7. Portion of a ripe male opposite the second pair of caudal 

 parapodia showing the external genital opening. Zeiss Oc. 8, Apo. 8 mm. 



Fig. 8. Transverse section of the caudal prolongation , through 

 the anterior part of parapodium, showing the seminal vesicle where it 

 opens! to the exterior. Zeiss Oc. 8, Apo. 8 mm. 



Fig. 0. Transverse section (in part) similar to preceding, but 

 slightly posterior to it, showing the distended part of the seminal 

 vesicle and a part of the canal on its inside. Zeiss Oc. 8, Apo. 8 mm. 



Plate 27. 



Fig. 10. One of the parapodia with fin-like expansion of a ripe 

 female showing the ovaries and free cells in the body cavity of the 

 main stem and forked branches. Zeiss Oc. 2, Apo. 8 mm. (The details 

 of the net-work were filled in from a narcotised specimen.) 



Fig. 11. One of the parapodia (in part) of a ripe female showing 

 the ovaries in the cavity of the forks. Zeiss Oc. 4, Apo. 8 mm. (The 

 specimen is slightly twisted from the action of fixing agents.) 



Fig. 12. One of the ovaries of a ripe female as seen from the side. 

 Zkiss Oc. 8, Apo. 8 mm. 



Fig. 13. Transverse section of a lobe of a parapodium of a young 

 female showing the ovarian cells arising from the endothelium. Zeiss 

 Oc. 8, Apo. 8 mm. 



Fig. 14. Transverse section of a lobe of a parapodium of a nearly 

 ripe female showing the cells of the ovary. Zeiss Oc. 8, Apo. 8 mm. 



Fig. 15. Transverse section of a lobe of a parapodium of a ripe 

 female showing ovarian cells at different stages of development. 

 Fig. 15 a. Zeiss Oc. 8, Apo. Ifi mm. Fig. 15 b. Zeiss Oc. 8, Apo. 

 8 mm. 



Fig. 1^3 a — c. Groups of ovarian cells approaching maturity in 

 ovary. Zki.ss Oc. 8, Apo. 16 mm. 



Fig. 17. Spherical group of ripe cells isolated from ovary by 

 pressure. Zfass Oc. 8, Apo. 8 mm. 



Fig. 18 — 23. Cell-masses floating in body-cavity at different stages 

 of ripeness. Zeiss Oc. 8, Apo. 8 mm. 



Fig. 24. Section of an egg just before fertilisation. Zeiss Oc. 8, 

 Apr). 8 mm. 



Fig. 25. Ripe egg. Zeiss Oc. 8, Apo. 16 mm. 



Fig. 26. Egg with nucleus vacuolated. Zeiss Oc. 8, Apo. 8 mm. 



