I9I7-] J- Stephenson : Indian Oligochaeta. 409 



annulus is beginning to be divided ; vii is quadriannulate, and 

 viii has five annuli through the division of the anterior annulus ; 

 the same annulation is continued back to the clitellum, except 

 that some segments may have even more numerous secondary 

 annuli. 



The prostomium is minute, prolobous^ withdrawn under cover 

 of segment i. 



Dorsal pores are present from furrow 11/12. 



The setae are paired ; in front of the clitellum ah =-=|- tof aa, 

 = ^cd\aa= be, and dd is two- thirds of the circumference. Behind 

 the clitellum ab = ^ aa (rather less immediately behind the clitel- 

 lum), = f or I cd, while aa is greater than he, about i| or i^ be ; 

 dd is three-fifths of the circumference. Behind the middle of the 

 body ah ^= ^ aa, = ^ ed ; aa = i^ be ; and dd is httle more than 

 half the circumference. 



The clitellum begins just behind the setae of xiii ; it includes 

 the whole of xvii. It is smooth, and there are no dorsal pores, 

 but setae are present, or the indications of them. 



The male apertures (fig. 28) are situated in pits on segment 

 xvii ; these pits are large and circular, with their centres in line 

 with seta b, and their inner borders internal to the line of a. 

 The apertures are transverse slits which are borne on papillae at 

 the bottom of the pits. The papilla being in the outer part of the 

 pitj the centre of the aperture is slightly outside the line of seta b. 



The female aperture was seen on the left side only, on segment 

 xiv, as a transverse slit corresponding in extent to the interval ah, 

 in front of which setae it is situated. 



The spermathecal apertures are comparatively small, slit-like, 

 the lips not swollen, in furrow 7/8 just outside the line of seta h. 



In furrow 15/16 are a pair of transverse depressions, elongated 

 and rather irregular in shape, pointed at their inner and outer ends 

 and broadest in the middle of their extent ; these extend inwards 

 to near the middle line and almost meet each other there ; and as 

 their middle point is external to seta b they are fairly extensive. On 

 the hinder part of segment xvi, behind the setae ab and extending 

 equally for a short distance to the inner side of the line of a and 

 to the outer side of the line of b, are a pair of small oval areas, 

 surrounded by a narrow groove and somewhat depressed in the 

 middle. 



Internal anatomy. — Septum 4/5 is strong, 5/6 very strong ; 6/7 

 and 7/8 are absent; 8/9 and 9/10 are somewhat thickened, lo/ii 

 slightly thickened ; the last three are very close together, so that 

 segments ix and x are very short segments internally. Segment xi 

 is absent as a separate cavity ; septum 11 12 is a membrane-like 

 sheet of tissue which binds the heart of segment xi to the alimen- 

 tary canal, and also attaches the vesiculae seminales to the wall of 

 the gut (see the description of the septa in E. waltoni, by Stephenson 

 (18), with which the present species agrees). Septum 12/13 is thin, 

 and bulged backwards by the seminal vesicle so as to lie against 

 13/14- 



