I9I4-J J- Stephenson : OH'^ochaeta from Northern India. 359 



Length 74-100 mm. ; breadth V—^ mm. ; colour pale yellowish 

 brown, uniform all over, except clitellum which is darker in 

 colour. Segments 163-167. 



Prostomium small, under cover of and marked off by a groove 

 from the first segment. There is a slight cleft running backwards 

 from this groove for a short distance on the dorsal surface, not 

 long enough however to divide the first segment completely. The 

 fourth segment is biannulate, segment v triannulate, vi-xi have 

 four annuli, xii has three principal annuli but six in all ; behind 

 the clitellum the segments are triannulate. 



Dorsal pores begin immediately in front of the clitellum, in 

 furrow il ; they are quite conspicuous on the clitellum in some 

 specimens, but not to be seen in others. 



The setae are closely paired. In general ah = i-^aa = Ibc = 

 cd ; and dd = about y of the circumference. 



The chtellum extends over xiii-^xviii = 53 (xiii-xvii = 5 , 

 or ixiii-xvii = 4^). The region is uniformly arched and smooth 

 laterally and dorsally (unless a few sharp-cut oblique cracks have 

 appeared), flat ventrally and wrinkled in its posterior half. 



The male genital field (fig. 13) is constituted by four flat 

 cushions or pads ; one of these, transversely elongated, occupies 

 Ts, from a point between lines a and b on one side to a correspond- 

 ing point on the other ; another of the cushions has a similar 

 position in \r, ; the two remaining cushions form a pair, on xviii, 

 between the ends of those first mentioned, much smaller than 

 these latter, and embracing each the situation of the ventral setal 

 couple of its side. There is thus left a rectangular space in the 

 middle of these four cushions, which represents the ventral 

 portion of segment xviii ; in one specimen this rectangular space 

 was reduced to a mere transverse fissure bji the encroachment of 

 the pads in front and behind. 



The only apertures that can be made out in this region are a 

 pair on segment xviii, just in front of the site of setae a, which 

 are absent The setae of xvii and xix are all present ; no prostatic 

 pores separate from those just described are even indicated ; and 

 indeed these cannot be said to be distinct^ since they are little 

 else than minute dots slightly darker than their surround- 

 ings. 



The female aperture is indicated by a small whitish area 

 mid ventrally in xiv, in front of the level of the setae. 



What might be called an anterior genital area is present in 

 the neighbourhood of the spermathecal apertures. In furrow I is 

 situated a transversely much elongated, slightly raised and flat 

 pad, somewhat rectangular in shape, extending laterally on each 

 side beyond the Une of setae b, and including the hinder annul us 

 of vii and anterior annulus of viii. The second annulus of viii 

 is also distinctly thickened for some distance on each side of the 

 mid-ventral Une. The spermathecal apertures are very probably 

 indicated by a pair of minute white dots, in line with h, on the 

 pad described as occupying the ventral portion of furrow I. 



