FORM OF NEPHRIDIA IN ARENICOLID.E. 



257 



have kindly placed at my disposal, material and facilities for the 

 work, and to the Carnegie Institution whose table at Naples it 

 was my pleasure to occupy. 



FIG. 12. The nephridium of Arenicola Gntbii, X J 5 dorsal view. The outline 

 of the ventral lip of the funnel is shown in dotted line. 



FlG. 13. Ventral view of anterior portion of the third left nephridium of A. 

 Grubii, X 2 - 



