34 ZOOLOGICAL RESULTS OF THE RUWENZORI EXPEDITION. 



between the nephridiopore in front and the ovipore behind could be easily fixed. 

 There is no trace upon tlie cuticle (which was stripped off and examined) of these setae 

 or of the orifices through which they protrude. In Neumanniella svphonochmta 

 Michaelsen particularly notes that setae are present * upon the clitellum. Nothing is 

 said upon the matter in the case of other species. The absence of setae upon the 

 clitellum is well known to occur in certain species of Pheretima, while other species 

 have them on the clitellum. 



The nephridiopores are very plainly visible upon the clitellar segments only with the 

 use of a lens ; but they are not thus visible upon the other segments of the body. 

 The reason for this is not whollj', if at all, the turgescence of the clitellar segments, 

 which thus makes the pores obvious. When the cuticle is stripped off it is very 

 distinctly to be noted that the pores themselves are smaller in size upon the pre- 

 clitellar than upon the clitellar segments. The difference is very considerable. This 

 can hardly be the result of stretching, and must indicate a larger nephridium, or, at 

 least, a larger terminal duct to the nephridium. I observed the first nephridiopore 

 upon the third segment. Michaelsen states (of the species f where he notes the 

 point) that the nephridiopores lie in line with the pair of setae c d. I found in 

 Neumanniella nmenzorii a decided relationship to seta c. These pores are, it should 

 be added, near to the anterior dividing-line of their segment. 



The clitellum of Neumanniella ruwenzorii is complete all round the body. It is as 

 strongly developed upon the ventral as upon the dorsal side. Its yellow colour 

 contrasts with the rest of the body. The clitellum shows some variation from species 

 to species of this genus in the fact of being saddle-shaped or as in the present species. 

 It begins upon the xiiith segment, the posterior one-third of which is invaded by the 

 clitellar epithelium. At the other extremity it ends upon the xviiith segment, so that 

 the dimensions are as in other species of the genus, and as in the Eudrilidae generally. 

 T have already remarked upon the apparent absence of setae upon this region of the 

 body ; there are also no traces to be observed externally of penial setae in the 

 neighbourhood of the male generative pore or elsewhere. 



The most anterior of the generative pores is the spermathecal aperture. This is very 

 conspicuous in the middle line and just on the boundary-line of segments xiii. and xiv. 

 It is rather a small orifice, but nevertheless quite evident. There is no modification 

 of the integument in its neighbourhood. On the xivth segment are the paired orifices 

 of the oviducts. These lie exactly benind the nephridiopores of that segment and not 

 far from the posterior boundary of the xivth segment. The apertures are quite 

 conspicuous, but not much (if at all) larger than the nephridiopores upon the clitellum, 

 which, as already mentioned, are wider than those apertures upon the segments in 

 front of the clitellum. 



* Loc. cit. p. 502. 



* iV. siplwnoclueta and -A'', tenuis., loc. cit. [jp. 502 & 505. 



