I9I4-] ^ J- Stephenson : OUgochaeta. ^ 383 



wider in this region ; grooves, secondary annulations, and dorsal 

 pores are absent, but setae are present. 



The genital field (fig. 6) is reminiscent of that of N. striata 

 as regards the longitudinal grooves and wart-like papillae ; though 

 at first glance the appearances seem markedly different. Thus 

 there is no yellow or brown pigmentation ; the whole ventral 

 surface of segments xvi-xviii, from the line of setae d on one side 

 to the same line on the other, is whitish in colour and appears 

 thickened, thus resembling the clitellum ; the intersegmental 

 furrows are obliterated, and a number of short transverse fissures 

 or grooves make their appearance. The longitudinal grooves, 

 bent outwards at their ends, have very much the position des- 

 cribed in N. striata. The four wart-like projections are also present, 

 but not quite so close to the grooves. In addition, a couple of 

 transverse shallow groove-like depressions, without definite 

 margins, join the longitudinal grooves of opposite sides across the 

 midd.le line, between the situations of the bends, near their ex- 

 tremities. Seta a is present, but not h, on both sides in segments 

 xvi and xviii ; both a and h are absent in xvii. 



The male aperture, minute, was seen on the right side within 

 the longitudinal groove, at the middle of its length ; it was not 

 certainl}^ distinguished on the left side. 



The female apertures are paired, small and not easy to see, 

 on segment xiii just in front of and internal to setae a. 



The spermathecal apertures were also difficult to distinguish ; 

 they are small, slit-like, in furrows f and «, approximately in the 

 line of setae a ; though as the setae have fallen out or are indis- 

 tinguishable in this region, the exact location is impossible. 



The first septum is t, which, as in the previous species, is 

 strongly concave forwards. It and the two following septa are 

 considerably thickened , though much less so than in N. striata; 

 septa To, ix and \\ are only slightly thickened. 



The gizzard is barrel shaped, and situated in front of septum 

 'f : its walls are of moderate thickness, though rather soft. Cal- 

 careous glands are present in segments x, xi and xii. The intes- 

 tine begins in xiv. 



There are numerous micronephridia attached to the body- 

 wall ; at the sides of the anterior part of the gizzard they consti- 

 tute large tufts of fairly long tubes. 



The last heart is in segment xii. 



The testes are in segments ix and x ; they lie deeply, close to 

 the ventral nerve cord, and each consists, as in the previous 

 species, of numerous fine thread-like processes, arising close 

 together from a circumscribed base. The funnels, in the same 

 segments, are relatively large and iridescent. 



The vesiculae seminales are two pairs, in segments x and xi ; 

 they are flattened antero-posteriorly, elongated in shape and 

 arching up from below so as nearly to meet dorsally above the 

 oesophagus ; their edges are slightly lobulated ; each is attached to 

 the posterior face of the respective septum for a considerable length. 



