600 OLIGOCHAETA 



logically, to the spermathecae of other Oligochaeta, this view is established on a 

 surer footing. 



Ifemertodrilus has two pairs of testes occupying the usual segments — viz. x and 

 xi. Opposite to these are the funnels of the sperm-ducts ; these are large and much 

 folded, but there is no dilated region of the sperm-duct immediately following them, 

 as there is in other Eudrilids, such as Eudrilus. The spermiducal glands are two 

 tubular organs as in other Eudrilidae ; their muscular covering is but slight ; the 

 tube is lined by the glandular epithelium found in most earthworms ; but there is 

 no specialization into a glandular and a non-glandular portion ; the two sperm-ducts 

 of each side unite only at their actual orifice into the spermiducal gland, which 

 occurs, as in nearly all Eudrilids, at a little distance from the caecal extremity of 

 the organ. 



The integument is entirely without the epidermic sense organs, which are so 

 distinctive a feature of several genera. 



Nemertodrilus griseus, Michaelsen. 

 N. griseus, Michaelsen, JB. Hamb. wiss. Anst., vii, 1890, p. 17. 



Deflnition. Length, 120 mm.; breadth, 7,\ mm.; number of segments, 278. Nephridia open 

 in front of ventral setae. Anterior septa rather stouter than those which follow. 

 Hah. — Quilimane. 

 The appearance of the worm is, according to Michaelsen, very like that of a 



Nemertine, frequently occurring in the German coasts. Linens gesnerensis of 0. F. 



MiJLLER. The colour is ' mouse-grey,' darker on the back than below, often verging 



towards a greenish olive tint. Mighaelsen's specimens were all collected at Quilimane, 



East Africa. 



Genus Libyodrilus, Beddakb. 



Depiktition. Setae strictly paired. Clitellum complete, (XIV) XV-XVI. Male 

 genital pore between segments XVII/XVIII. A single median spermathecal 

 sac, communicating with the exterior on segment XJII, forming a ring round 

 the oesophagus, and again round the nerve-chord. Penial setae present. 



This genus was described by myself a year or two ago, from specimens received 

 from Lagos, West Africa ; it contains, at present, but one species, L. violaceus. 



The first intersegmental septum separates segments iv/v ; the septa which lie 



