PEANK E. BEDDAED— VERMES. 29 



species with which I have compared it in the nature of the spermathecal diverticula. 

 The slender spermatheca just in front of the terminal section of the male efferent 

 apparatus divides into two branches, which diverge at right angles and run dorsally, 

 this portion of the spermatheca forming a tube more than 5 mm. in length. Towards 

 the dorsal median line the tube of each side turns back upon itself after emitting a very 

 short but slightly swollen diverticulum ; the recurrent branch runs alongside of the 

 outgoing branch, the two forming a loop which suggests at first sight a nephridium. 

 It is indeed not very much thicker than the nephridia. The returning branch then, 

 having arrived at the level of the point whence it departed, dorsally turns at right 

 angles and joins its fellow a little in front of the external aperture, which is quite 

 inconspicuous. This peculiar origin of the diverticulum on each side is exactly 

 matched in the three species to which the present is evidently allied, viz. Polytoreutiis 

 usindjaensis, P. Mrimaensis, and P. sylvestris. But in all of the three species mentioned 

 the diverticulum itself is of some considerable calibre. Polytoreutus Mrimaensis comes 

 nearest to the present species in that the diverticulum is smaller than in the other two. 

 But even in that species it is much larger than in P. nmenzorii. There is thus no 

 difficulty in discriminating Polytoreutus ruwenzorii by the structure of the female 

 efferent and copulatory apparatus. It is very interesting to notice that Polytoreutus 

 ruwenzorii also shows points of resemblance to P. sylvestris and P. Mrimaensis (but 

 apparently not to P. usindjaensis) in the structure of the male efferent apparatus, which 

 has been already described. There seems to be no doubt that these four species form 

 a little group of Polytoreutus ; but it is not possible in my opinion to separate them off 

 from the other species as a genus or even a subgenus, at least at present. 



It is clear from the above account that Polytoreutus ruwenzorii comes nearest to 

 P. sylvestris of Michaelsen. It is only, as I think, with this species that we have to 

 reckon in determining the distinctness or otherwise of the Polytoreutus which I regard 

 as new. 



The most plain differences from this species are to be seen in the small size of the 

 spermathecal diverticula and the very reduced length in front of the undivided portion 

 of the posteriorly fused spermathecal sacs. It may be thus defined : — 



POLXTOEEUTUS RUWENZORII. 



Length 70-80 mm. ; breadth 4-5 mm. Pistance between setce of ventral pair three 

 times that between setce of lateral pair. Outer seta of lateral pair absent on clitellar 

 segments. Clitellum saddle-shaped. Male pore xvii.jxviii. ; spermathecal pore xviii.lxix. 

 No genital area behind pores. Spermathecal sac bifurcate for a short distance in front ; 

 posterior diverticula very small ; oviduct between spermathecal sac and receptaculum 

 very long. Bight sperm-sac longer than left. Spermiducal glands giving off duct in 

 front of proximal end gland, much furrowed. Copulatory chambers present. 



