i65 



net. 



,,sep 



hr.U 'n. C.U 



Fig. 113. — A diagram of a nephridium of the earthworm. 



bt.U, Brow, ciliated tube; m.t, muscular tube; n.ci., glandular, non-ciliated tube ; nt.. narrow tube 

 ciliated in parts; «s^., nephrostome ; se^., septum ; ves.hss., connective tissue with vesicular ceUs 

 and blood vessels ; i, 2, 3, the three hanks of the tube. 



. 1H.4S, 





deb^ 



mc- 



pe.—m 



6 



Fig 114— The nephridiostome or funnel of a nephridmm of the earthworm. 

 A, seen from in front as a transparent object; B, in side view, opaque, semi- 

 diagrammatic, and without its ciha. 



r,*. r Central ceU • deb debris of ccelomic corpuscles and excretory granules vyhich is probably not able 

 to enter thefuAnel"'/ /lower Up of opening ; m.c, marginal cells ; p.e., superhcial layer of the peritoneal 

 SitS£um;T^'.! thickened deeper layer of the same ; x., point at which the marginal cells ]om the 

 lining of the tube, which turns over round the opemng. 



