I9I7-] J. Stephenson : Indian Oligochaeta. ' 393 



clear-cut groove, the flat surface of the papilla being about on a 

 level with the general surface. Of these the anterior is midven- 

 tral, m furrow 16/17 ; the posterior has its centre on the anterior 

 part of segment xx, but its size is such that it encroaches forwards 

 on to segment xix, and so partially obliterates groove 19/20 (fig 

 15) ; It IS to the left of the middle line, and takes up in transverse 

 extent a space equal to the distance between seta a and / The 

 antero-posterior length of each papilla is almost equal to the length 

 of a segment. Setae are absent from xvii and xix midventrally 

 and from xx in the region of the papilla. The whole area of the 

 male pores and papillae is whitish and thickened. 



The female aperture is situated midventrally on segment xiv 

 m the centre of a small circular area in front of the line of the 

 setae. 



The spermathecal apertures are represented by two pairs of 

 small elevations on segment viii ; of these the anterior are situated 

 between the row of setae and the anterior margin, the posterior just 

 m front of furrow 8/9 ; all are pretty close to the middle line. There 

 appear to be a few displaced setae on each of the anterior pair of 

 papillae ; but the curious thing is that there is no actual pore no 

 definite opening, either on the papillae or elsewhere ; I looked for 

 apertures carefully in the grooves, but there are certainly none 

 there. This peculiarity seems to characterize all the species of the 

 genus ; and one is driven to suppose that the spermathecal aper- 

 tures form only when actually required, at the time of copulation 

 and oviposition ; at any rate the openings are only virtual or po- 

 tential at other times. 



In this region there are other small elevations which bear 

 setae ; a pair on segment ix, just in front of the setal line, and a 

 pair on vii actually in the line of the setae (in this latter case the 

 special setae are therefore not " displaced '"). 



In this species also the appearances on the genital region 

 vary somewhat in different specimens. Thus it is commoner to 

 find the anterior of the two papillae of the male area on the right 

 side, balancing the posterior, as it were, which is on the left ; or 

 both anterior and posterior papillae may be midventral or almost 

 so; or there may be only one papilla, posterior and on the right 

 side. In the spermathecal region the special setae on their papillae 

 are usually in line with the ordinary setae of segments vii and 

 ix. 



Internal anatomy.— ThQ disposition of the septa is so similar 

 to what has been described for the last species that nothing further 

 need be said. 



The gizzard, squarish in form and of moderately large size, is 

 in segment vi. Calcareous glands, of large size, stalked and set off 

 from the oesophagus, are present in segments xii and xiii ; they 

 are over-arched by the hearts, and in xii overlaid by the seminal 

 vesicles; similar glands are also present in x and xi, but smaller 

 and more deeply placed in the segment. The intestine begins in 

 xvi ; the typhlosole is a simple longitudinal vertical lamina, of 



