456 EDWIN S. GOODEIOH. 



Fig. 11. — Nephridial complex of an anterior segment of Gl. unicornis. 

 Tiie nephridial chambers and canals are partially shown by transparency. 

 Fresh. Cam. 1. 4, oc. 3. 



Fig. 12. — Portion of the nephridium ofGl. convolutus near the origin of 

 the duct. Fresh. Cam. x 400. 



Fig. 13. — Nephridial com])lex of GI. convolutus. Fresh. Cam. X 100. 



PLATE 33. 



Fig. 14. — Surface of the nephridium of Gl. convolutus. Fresh. L. Oil 

 im., oc. 3. 



Fig. 15. — Diagrammatic reconstruction of a portion of the nephridium of 

 Gl. siphonostoma, cut so as to show the course of the canals, &c. The 

 inner surface would be applied to the wall of the nephridial sac. 



Figs. 16 and 17. — Two sections through the same nephridial complex of 

 Gl. unicornis (longitudinal through the animal). Cam. X 140. 



Fig. 18. — Optical section of the edge of the nephridial sac (near the caecum) 

 of Gl. unicornis. Perenyi, paracarmine. Cam. 1. Oil im., oc. 3. 



Fig. 19. — Section taken almost transversely near the extremity of the 

 caecum of the nephridial sac of Gl. unicornis, showing the secondary 

 chambers separated by thin partitions. Cam. 1. Oil im., oc. 3. 



Fig. 20. — Section along the caecum of a similar specimen. Cam. x 400. 



Fig. 21. — Section across the nephridial complex of Gl. convolutus. 

 Cam. 1. Oil im., oc. 3. 



Fig. 22. — Two amoeboid haemoglobiuous coelomic cells of GI. siphono- 

 stoma, fresh from a specimen eighteen hours after injection with Indian ink 

 and carmine. Cam. X 500. 



Fig. 23.— Three of the "granular cells" from the nephridial sac of Gl. 

 siphonostoma. Fresh. Cam. x 400. 



PLATE 34. 



Fig. 24. — Portion of a preserved nephridium of Gl. unicornis seen from 

 the outer surface. The tube-bearing cells are not drawn ; the canals, &c., are 

 seen by transparency. Cam. 1. Oil im., oc, Z. 4 c. 



Fig. 25. — Portion of a section through the nephridial sac of Gl. unicornis. 

 Cam. Z. D, oc. 3. 



Figs. 26, 27, and 28. — Three longitudinal sections of Gl. unicornis taken 

 from within outwards, showing the nephridium, the nephridial sac, and the 

 ciliated organ, extending on to the body-wall. Cam. x 200. 



Fig. 29. — Portion of the nephridium from a section similar to that drawn 



