NEW GENEEA AND SPECIES OE EARTHWORMS. 245 



the most part marked by a median ridge. On mounting in 

 glycerine a portion of the body-wall, embracing several of 

 these clear spots, they are seen to be distinguished from the 

 surrounding integument, not only by an absence of pigment, 

 but also by an absence of glandular cells ; they are, indeed, 

 the representatives of the peculiar and characteristic sense- 

 organs of the Eudrilidse ; as in Hyperiodrilus, and, in fact, 

 in all other genera where these organs occur, they lie with the 

 long axis horizontal ; the central core as well as the numerous 

 coats surrounding it were quite plainly visible in glycerine 

 preparations. 



The nephridiopores are very conspicuous ; they lie in front 

 of the dorsal setse, but are not definitely related to either of 

 the two setse of the pair. They are especially obvious upon 

 the clitellar segments, owing, of course, to the distended in- 

 tegument of those segments. The first pair of nephridiopores 

 lie on the intersegmental furrow 2 — 3. 



There are no dorsal pores. 



The clitellum occupies Segments 13 — 17. It is developed 

 all round the body, except on the 17th segment, where it is 

 invaded by a portion of the large genital protuberance. The 

 grooves between the clitellar segments are always more or less 

 distinct. 



The genital protuberance (see fig. 10) is an oval raised area 

 about 8 mm. in length, which occupies the middle part of 

 Segments 17, 18, and 19. The area which forms this pro- 

 tuberance roughly corresponds in extent to the space between 

 the outer setse of the ventral couples. Its colour is precisely 

 that of the clitellum. It bears two apertures, one behind the 

 other. The anterior of the two is the male genital aperture ; 

 it is a wide slit-like orifice between Segments 17 — 18; it has 

 a crescentic form, the convexity being directed forwards, as 

 illustrated in fig. 10. The posterior orifice is that of the 

 spermatothecse ; it is small and also slit-like, so narrow as to 

 be often invisible ; it lies on the border line between Segments 

 18 — 19. The genital protuberance is marked by two ridges 

 running at right angles to each other : one runs transversely 



VOL. XXXIV, PART 111. NEW SEE. E 



