DESCRIPTIONS OF GENERA AND SPECIES 611 



clitellum which MICHAELSEN did not find in his species. The single genital papilla 

 is oval in outline with raised margins ; it extends a little way to the outside of the 

 ventralmost setae. 



The shape of the spermathecal pouch is highly characteristic of the species : the 

 most anterior pair of diverticula in which the sac terminates do not, as in P. coeruleus, 

 end in an ovarian sac ; in the present species there are a pair of minute sacs, one to 

 each of the anterior processes of the spermathecal sac, which are attached a little way 

 behind the actual termination of the sac ; these seem to be the equivalents of the 

 ovarian sac of P. coeruleus. The sperm-sacs originate as two very fine tubes, which, 

 in the thirtieth segment, become much wider ; the wider part of the sperm-sacs 

 is about ten segments in length. 



(4) Polytoreutus finni, BEDDARD. 

 P. Finni, BEDDARD, loc. cit., p. 241. 



Definition. Length, 183 mm.; breadth (at clite.llum), 3 mm.; number of segments, 500. 



Clitellum, XIII-XVIII. Spermathecal sac with only one pair of diverticula, in XIII. 



Hal. Kilindini, E. Africa. 



This species is also very distinct ; its most obvious external character is its 

 extraordinary length and number of segments ; on the ventral surface the two 

 genital apertures occupy nearly the whole of the body, and appear to be unusually 

 large ; between the two pores is an area which differs in appearance from the rest 

 of the clitellum ; the orifices are marked by a series of radiately arranged furrows. 

 With regard to internal characters, there are other distinguishing marks of the species 

 besides those mentioned in the above definition. The paired calciferous glands seem to 

 be situated a segment or two further back than is the case with other species ; their 

 shape too is peculiar ; each is curled like a ram's horn. The sperm-sacs are slender 

 tubes, like the sperm-sacs of other species, for the first few segments of their course ; 

 here and there, one, at any rate, of the two sacs exhibited varicosities which lodge 

 the sperm ; it may be that the sperm-sacs of the single individual examined by me 

 were immature. 



- 



(5) Polytoreutus kilindinensis, BEDDARD. 

 P. kilindinensis, BEDDARD, loc. cit. p. 236. 



Definition. Length, 120 mm.; breadth, 5 mm. ; number of segments, 220. Clitellum, 

 XIVXFIII. A median papilla extending over segments XVIII-XXf. Spermiducal sac 

 as in P. elongatus. Hab. Kilindini, E. Africa. 



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