40 EARTHWORMS AND THEIR ALLIES [ch. 



In the worms of this family the male pores are 

 usually upon the tenth segment but sometimes upon 

 the eighth or eleventh. And in addition to a pair 

 of funnels in the antecedent segment there is also 

 commonly a second pair in the same segment as that 

 which contains the external pore. The two sperm 

 ducts however open into the same distended atrial 

 cavity before opening on to the exterior. In Lam- 

 prodrilus however each sperm duct opens by its 

 own separate atrium on to the exterior and in two 

 consecutive segments. In Teleutoscolex there is but 

 one pair of funnels opening into the same segment 

 with the atrial pore. 



Near perhaps to the Lumbriculidae comes a very 

 small family indeed, that of the Alluroididae. So 

 small is it that it consists of but a single genus 

 Alluroides of which there are two species A.pordagei 

 and A. tanganyikae. Both of these species were 

 described by myself, one of them from but a single 

 specimen, the other from only two. Both species 

 and the name of one denotes the region are from 

 eastern tropical Africa. The Tanganyika worm is 

 purely aquatic; the other species was found in a 

 swamp of the mainland opposite to Mombasa. This 

 remarkable genus has a pair of spermaries in 

 segment x ; but the ovaries are as in earthworms in 

 the xiiith segment. The male pores are upon that 

 segment also, ie. further back than in the aquatic 



