232 Freda Bags : 



but a short description is included here to complete the series 

 I have worked, and diagrams are given. So far as I can ascer- 

 tain there are only one or two minor points which appear 

 to differ from the work published before. 



No nephridiopores are visible. 



Micro and meganephridia are present, also peptonephridia. 



Macroscopic Structure. — Peptonephridia are present in seg- 

 ments 1-4 : micronephridia in every segment after the fourth^ 

 attaclied to the outer walls of the segments. Meganephridia 

 are present in addition, only in the more posterior portion of 

 the body. In one specimen examined there were 330 seg- 

 ments, and typical meganephridia occurred from segment 180 

 to the posterior end, one pair in each segment. From segment 

 180 forwards [Fig. 12] a few large nephridia [Fig. 12, Nl] are 

 present, but only here and there. These, though quite dis- 

 tinct from the micronephridia in size and position, have for 

 the most part no funnels, but are still connected with the 

 anterior septum. No nephridial funnels could be seen besides 

 the single ones on either side of the nerve cord. 



Microscopic Structure. — By means of sections the structure 

 and arrangement of the various nephridia, and the ducts con- 

 necting then), can be more clearly ascertained. At fhe hinder 

 end of the body there is in each segment a pair of mega- 

 nephridia, each consisting of a funnel, a short, straight tube, 

 and a coiled part, present on each side of the nerve cord. The 

 funnel, -as usual, opens into the segment anterior to the one in 

 which the main part of the nephridium is situated ; and through 

 the wall of this latter segment a fine duct communicates with 

 the exterior. [Fig. 13, N.d.] There is also present in the same 

 segment many micronephridia [Fig. 13, n^, n^, n^], each of 

 which gives off a single definite duct [n^d., n2d., n^.], which 

 passes through the muscles of the body wall to the exterior, 

 though it has apparently no internal opening. The ducts from 

 both micro and meganephridia pass out singly between the 

 blocks of longitudinal muscle fibres [Fig, 12, nM.), or through 

 the fibres eomposing the block [Fig. 12, n2d.], and, branchin}^ 

 among the circular muscles, form a regular network [n.c.l.] from 

 which small single ducts pass, opening at irregular intervals 

 on to the surface. Furtlier forward, where the meganephridia 



