ON THE NEPHEIDIA OP THE POLYCHiETA. 195 



Figs. 14, 15, 16. — Portions of three sagittal sections, taken from within 

 outwards, illustrating the relation of the nephridial funnel to the ciliated 

 organ, x 250, cam. 



Fig. 17. — Enlarged view of the nephridial funnel freshly dissected out. 



Fig. 18. — Piece of the dentated edge of a ridge of the ciliated organ of 

 Nephthys scolopendroides, much enlarged. 



Fig. 19. — Enlarged view of the ciliated organ of Nephthys scolopen- 

 droides, freshly dissected out. The cilia are not represented. 



PLATE 8. 



Figs. 20—22, Hesione sicula. Figs. 23—25, Nephthys scolopen- 

 droides. 



Figs. 20, 21, 22. — Portions of three frontal sections, taken from above 

 downwards, showing the ciliated organ and its ventral connection with the 

 nephridium. x 40, cam. 



Fig. 23. — Portion of a frontal section of a female, showing the ciliated 

 organs and nephridial tubes. X 100, cam. 



Fig. 24. — More enlarged view of the ciliated organ and nephridial tube, 

 from the same series as Fig. 23. X 400, cam. 



Fig. 25. — Portion of a transverse section, showing the nephridial tube cut 

 twice, the ciliated organ, and a piece of the terminal branch of the nephridium. 

 X 130, cam. 



PLATE 9. 

 Figs, all of Nephthys scolopendroides. 

 Fig. 26. — Enlarged view from a fresh specimen of a small piece of the 

 ciliated organ and a branch of the nephridial plume, showing the tube-bearing 

 cells. 



Fig. 27. — Semi-diagrammatic transverse section of a branch of the terminal 

 nephridial plume. 



Fig. 28. — Semi-diagrammatic longitudinal section of the same. 



Fig. 29.— Branch of the nephridial plume stained and somewhat flattened 

 out. X 500, cam. 



