STRUCTURE OF TWO NEW GENERA OF EARTHWORMS. 237 



The prostomium does not completely divide the peri- 

 stomial segment; but it sends back (see fig, 6) a very narrow 

 prolongation, which is embedded in the peristomial segment 

 up to a point not very far distant from its posterior border. 

 Such a narrow prolongation of the prostomium appears to be 

 characteristic of the Eudrilidse ; it is specially mentioned by 

 Rosa (10) in the case of Teleudrilus, and is figured by 

 Michaelsen (7, pi. iii, fig. 17) in Nemertodrilus. 



The dorsal setae are in couples; of the ventral setse^ the 

 individual setae of each couple are some little way apart; as 

 illustrated in figs. 9 and 12. 



The clitellum is developed all round the body, and 

 occupies four segments,, Nos. 14; 15, 16, and 17, as in 

 other Eudrilidae, where four segments is also the usual extent 

 of the clitellum, though sometimes, as in Polytoreutus, ex- 

 ceeded. Only one specimen, however, had the clitellum 

 developed upon the 14th segment, and here it was incomplete, 

 extending only over the dorsal surface of that segment. In 

 two other specimens the clitellum only occupied Segments 15, 

 16, 17. 



Nephridiopores were obvious upon most of the segments 

 of the body, particularly upon the clitellum, where the smooth 

 swollen integument rendered them very easily visible. They 

 lie almost in the intersegmental furrow in front of the dorsal 

 setae. It may be noted that they occur, as shown in fig. 23 of 

 PI. XVIII, in the 14th and 17th segments, where the ducts of 

 the generative organs open. 



Dorsal pores could not be detected in any part of the 

 body. 



The apertures of the oviducts are upon the 14th seg- 

 ment near to its posterior border : each has the appearance of 

 a minute hemispherical projection, which cannot be confounded 

 with a nephridiopore ; besides, as already mentioned, the 

 14th as well as the 15th segment has its nephridiopores. 



The oviducal papillae, as they may be more accurately spoken 

 of, are situated behind the dorsal seta of the 14th segment on 

 each side ; in one case, as shown in fig. 23 of PI. XVIII, they 



