igiy.] J. Stephenson : Indian Oligochaeta. 367 



in some species are only very faintly indicated, and only in the 

 anterior segments. 



Prostomium prolobous. 

 Dorsal pores absent. 



The setae are small and closely paired ; aa is less than be and 

 d is below the lateral line of the body. 



The nephridiopores appear to be in line with the setae c. 

 No clitellum was visible on any of the specimens. 

 The male pores are slits with swollen anterior lip, in the inter- 

 segmental groove lo/ii^ with their centre just outside the line h. 

 The female apertures are doubtfully in ab or b. 

 The spermathecal apertures, with slightly swollen lips are in 

 ylS in or just internal to c. ' 



There are no other genital markings. 



Internal anatomy.— Se^^t^ 5/6, 6/7, jj^, and 8/9 are consider- 

 ably thickened, the rest all thin. 



The gizzards are four in number, in segments xv to xviii ; the 

 alimentary tube is also slightly strengthened in segment xiv. There 

 are softer annuli behind each gizzard in each of the four segments. 

 The last heart is in segment ix. 



The testis-sacs are kidney-shaped, in segment x, the anterior 

 end projecting slightly into ix on the left side in the specimen dis- 

 sected but not on the right. 



The prostates are small and tubular, with a smooth and shining 

 surface (hence probably muscular) ; each is slightly coiled, and the 

 free end, which points inwards, is somewhat dilated (fig. 2). 



The closely convoluted vas deferens forms a soft mass below 

 the testis-sac on the anterior face of septum q/io ; below it joins the 

 anterior face of the prostate not far from its free ental end (fig. 2). 

 In the dissection segment xi appears open above,— not closed 

 dorsally by the apposition of septa lo/ir and 11/12 to form an 

 ovarian chamber ; the floor of this space, above and at the sides of 

 the alimentary canal, is formed by a membranous sheet which 

 passes from the anterior to the posterior septum, so that the 

 alimentary canal is excluded from the space which contains the 

 ovaries and funnels. 



Each ovary appears as a fringe on the posterior surface of 

 septum lo/ii, crescentic in form, tapering upwards nearly as far as 

 the dorsal vessel. The ovisacs are small and finger-shaped, and (in 

 the specimen dissected, at least) are confined to segment xii. 



The spermathecal ampulla is small, roundly ovoid ; from it is 

 given off the somewhat wavy or coiled duct, which wanders down 

 on the posterior face of septum 7/8, reaching the body- wall before 

 becoming connected with the atrium. The atrium does not appear 

 in segment viii at all ; it is a finger-like process altogether in front 

 of septum jI^. It shows no dilatation at its base, i.e. there is no 

 atrial chamber apart from the process itself. The spermathecal 

 duct joins the atrium at its ectal end, within the body-wall. 



Remarks.— "The finger-like upwardly projecting atrium relates 

 the present form to D. travancorensis and D. jalpaigurensis ; the 



