2IO GRAF. [VOL. I. 



The subjects of the last two items have been shortly dealt 

 with in a preliminary account which appeared in the Zool. Anz., 

 No. 468, February, 1895, " Ueber den Ursprung des Pigments 

 und der Zeichnung bei den Hirudineen." 



The physiology of excretion has been made the subject of a 

 lecture at the Marine Biological Laboratory at Wood's Holl, 

 Mass., in August, 1896, which will be published in the volume 

 of lectures for 1896 and 1897. 



The few new points in No. i I shall not record here, and it 

 therefore only remains to me to outline my results on the 

 anatomy and cytology of the nephridium. 



I. Anatomy of the Nephridium of NepJielis and Clcpsine. 



The following terms have been proposed for the different 

 parts of the nephridium of these forms: 



1. Portio afferens : the funnel apparatus. 



2. Portio afferens-glandulosa: the part of the nephridial 

 gland which both receives excretory products and which at the 

 same time by its own chemical activity produces oxydized end- 

 products. 



3. Portio glandulosa-efferens: the part of the nephridium 

 which has, besides the chemical excretory function, the task 

 of conveying excretory end-products to the outside. 



4. Portio efferens: the terminal vesicle and the terminal 

 canal, opening at the surface of the animal to the exterior. 



The portio afferens'. ' - - The funnel apparatus consists of two 

 distinct parts: the crown and a vesicle. 



The funnel crown is formed in Nephelis by from five to eight 

 bilobed ciliated cells grouped around a central lumen. The 

 cells are all strongly curved to the outside and downwards, and 

 the funnel crown may in its shape be best compared with the 

 flower of a tiger-lily (Lilium tigrinum or Lilium martagon). 

 The crown cells are covered with cilia on the convex (upper 

 and inner) surface, and these cilia produce by their motion a 

 stream running centripetally, by which little granules floating 

 in the surrounding liquid are conveyed into the central 

 opening. 



