ON A NEW ORGAN IN THE LYOORIDEA. 395 



the lip of the funnel is not reflected, and the processes, which 

 are longer and more delicate, spring from the margin only. 

 The inner wall of the funnel is formed of large vesicular cells 

 (figs. 9 and 9 a, w.fim.) with round nuclei and deeply staining 

 inner borders ; they bear numerous strong cilia (figs. 9 and 

 9 a, int. cil.), which beat very rapidly. 



From the funnel we pass to a short, narrow, glandular 

 region, which is not ciliated (fig. 9 a, n. can. ; not shown in 

 fig. 9), leading into the first region, the long post-septal canal 

 (fig. 8, j9. s. can.). The wall of this canal is composed of many 

 glandular cells, and becomes ciliated towards the nephridial 

 body. On entering the main compact body of the nephridium 

 the second region of the nephridial canal becomes much con- 

 voluted, but scarcely differs in structure from the next region, 

 except in having more nuclei round the tube, and a few cilia 

 distributed all round the lumen. 



The third region is chiefly distinguished by having a very 

 narrow lumen, and the cilia situated only on one side of the 

 tube (figs. 11, 16, cil.). The cilia may not be in a single row, 

 but the arrangement is essentially similar to that described 

 by Dr. Benham in Lumbricus (1) ; and the peculiar sinuous, 

 wave-like effect produced by the motion of the cilia in the 

 nephridia of most Oligochsetes is visible here also. 



In a transverse section of this region of the canal, one 

 (fig. 11, n.) or two nuclei are generally present; I cannot say 

 for certain whether the tube should be considered as inter- or 

 intra-cellular. No doubt a hard and fast line of distinction 

 cannot be drawn between the two varieties. The narrow tube 

 which constitutes the third region of the nephridial canal is 

 chiefly situated in the distal half of the nephridium, and leads 

 into the fourth and last region (fig. 8). 



This region is shorter and less convoluted than the last, and 

 is situated on the under surface of the nephridium (fig. 8). 

 Its lumen is moderately wide, and not provided with cilia 

 (figs. 12 — 14) ; at more or less regular distances along the 

 tube are two nuclei, situated opposite each other on either side 

 of the lumen (figs. 12 and 15, n.). The nuclei in this and 



