194 EDWIN S. GOODRICH. 



cess of the cell, neph.f. Nephridial funnel, neph.p. Nephridial pore. 

 neph. t. Nephridial tube. oil. m. Oblique muscles, obi. sept. Oblique mus- 

 cular septum, par. Parnpodium. ph. Pharynx, p. neph. t. Path of the 

 nephridial tube. pr. Protoplasmic process, r. v. v. Right ventral vessel. 

 sept. Septum, subint.m. Subiutestinal muscular band, term.pl. neph. Ter- 

 minal plume of the nephridium. tu. Tube. v. I. m. Ventral longitudinal 

 muscle. V. I. v. Veutro-lateral vessel, v, prol. Ventral prolongation of the 

 ciliated organ, v. v. Ventral vessel. 



PLATE 6. 



Figs. 1 — 6. — Hesione sicula. 



Fig. 1. — Enlarged inner view of the right half of two segments from the 

 mid-region of the body. Drawn from fresh and hardened specimens. 



Fig. 2. — Diagrammatic reconstruction of the ciliated organ, the nephridium, 

 and accompanying blood-vessels, as seen from in front. The cilia are not 

 represented. 



Fig. 3. — Portion of the ciliated organ much enlarged. From the fresh. 

 X 95, cam. 



Fig. 4.— Section through the wide part of the nephridial tube. X 400, 

 cam. 



Fig. 5. — Section through the ciliated organ, across the ridges, and show- 

 ing an accumulation of coelomic corpuscles. X 400, cam. 



Fig. 6. — Section through the narrow and convoluted region of the nephridial 

 tube, cutting the lumen seven times, x 400, cam. 



Fig. 7.— Enlarged inner view of the right half of four segments from the 

 mid-region of Nephthys CEeca. A portion of the intestine is represented 

 in front. Drawn from a hardened specimen. 



Fig. 8. — Diagrammatic reconstruction of the ciliated organ, nephridium, 

 and accompanying blood-vessels of Nephthys scolopendroides, as seen 

 from in front. The cilia are not represented. 



PLATE 7. 



Figs. 9— 17. — Hesione sicula. 

 Figs. 9, 10, 11.— Portions of three transverse sections, taken from before 

 backwards, showing the relation between the ciliated organ and the nephridium. 

 X 20, cam. 



Fig. 12. — More enlarged view of portion of Fig. 10, showing the connection 

 between the ciliated organ and the nephridial funnel. X 130, cam. 



Fig. 13. — Similar figure of a portion of a transverse section from another 

 series^ showing the continuity between the ventral prolongation of the 

 ciliated organ and the lip of the nephridial funnel. X 400, cam. 



