ON THE STRUCTQRE OF VEEMIOULUS PILOSDS. 267 



Fig. 24:. — Longitudinal section through the median spermiducal chamber. 



Fig. 25. — General view of a nephridium, seen from below ; from the living. 

 Z., ob. D, oc. 4. 



Fig. 26. — View of the nephridial funnel from below ; optical section from 

 the living. Z. apoch. 4 mm., oc. 8. 



Fig. 27. — View of the nephridial funnel from the side ; optical section from 

 the living. 



Fig. 28. — View of the post-septal mass of the nephridium, reaching through 

 the septum to the funnel ; from the living. So far diagrammatic that the 

 whole course of the caual is represented, although it could not be followed 

 out for certain in all its parts. Z., ob. D, oc. 8. 



Fig. 29. — Section through the nephridiostome and post-septal canal, show- 

 ing the nuclei of the funnel cells. Z. apoch. 4 mm. oc. 4, camera. 



Fig. 30. — Small portion of section through the body of the nephridium, 

 showing the canal and the nuclei of the nephridial cells. Z. apoch. 4 mm., 

 00. 4, camera. 



Fig. 31. — Small portion of the living nephridium, showing the ciliated 

 ampullae. Z., oil imm. 2 mm. oc. 4. 



Fig. 32. — Main body of the nephridium attached to the ventral longitu- 

 dinal blood-vessel; from the living. Z. apoch. 4 mm., oc. 4. 



