the Nephridia of the Actiiiotroclia. 



77 



funnels. Ikeda and Roule, on the other hand, tell us that 

 they end blindly. 



Goodrich has recently published a paper on the ncphridia 

 of the Actinotrocha, and has f^iven a very complete and accu- 

 rate descrij)tion of their anatomy. My observations on these 

 organs for two difterent species of Actinotrochce confirm his 

 work in nearly every detail. I find that the nephridial canal 

 does not open by funnels into the collar-cavity, but that it 

 ends in a thin-walled bulb, from the surface of which many 

 thin-walled tubular processes or excretory cells radiate (fig. <i). 



Fijr. 6. 



.cx.c 



Lijugituihiial section tlirowuli nepliiidiumof an Actinotrocha from Beaufort 

 Harbour, X 1200. ex.c, excretory canal; ex.j).^ excretory 

 process;^., fla;;ellum ; Jieph.c, nephridial canal. 



These are really continuations of the blind end of the 

 nephridial canal, and the lumen of each process is continuous 

 proximally with that of the latter, but distally it is closed by 

 a cell-like structure possessing one or more nuclei (fig. (>, ex.c.). 

 P^ach tubular process contains a fiagellum which arises from 

 the cell at the tip of the former. Goodrich claims that there 



