ON THE NEPHEIDIA OF THE POLYCH^TA. 457 



in Fig. 26, showing tlie canals, chambers, and solenocytes. An irregular 

 cavity is left between the nephridium and the wall of the nephridial sac, cav. 

 Cam. 



Fig. 30. — Diagrammatic reconstruction of the nephridial complex of Gl. 

 siphonostoma, showing the nephridial sac (represented as empty), the 

 ciliated organ, and the nephridium (yellow). 



Fig. 31. — Diagrammatic reconstruction of the nephridium (yellow) and 

 genital funnel (ciliated organ) of a ripe Goniada maculata. 



PLATE 35. 



Fig. 32. — Portion of a section through the wall of the nephridial sac and 

 overlying nephridium of Gl. unicornis. Cam. x 1600. 



Fig. 33. — Longitudinal section through Goniada emerita (median 

 region), showing the septa, nephridia, and undeveloped or rudimentary genital 

 funnels. Cam. x 100. 



Fig. 34. — More enlarged view of a portion of a similar section. Cam. 

 X 400. 



Fig. 35. — Section through the lobed inner extremity of the nephridium of 

 G. emerita, showing the solenocytes on the surface. Cam. x 400. 



Fig. 36. — Longitudinal section (lower half) of Goniada maculata, 

 showing the genital funnels opening behind into the nephridial ducts. Cam. 

 X 100. 



Figs. 37 and 38. — Sections from the same series taken farther outwards, 

 showing the course of the nephridium carrying the spermatozoa to the ex- 

 terior. Cam. X 100. 



Fig. 39. — Section from the same series taken farther inwards than Fig. 36, 

 and showing the lip of the genital funnel and the inner extremity of the 

 nephridium. Cam. x 100. 



Fig. 40. — Enlarged view of ths lip of the genital funnel and the underlying 

 nephridial canal. Cam. x 400. 



VOL. 41, PART 3. NEW SERIES. II 



