142 Memoirs of the Indian Museum. [Voi,. I, 



External Characters. — Dimensions: I^ength 60 — 70 mm., greatest thickness 

 3 — 3^ mm., number of segments about 150. 



Colour dirty grey (the specimens were not well preserved ; softened). 



Head? 



Setse very tender, very strict^ paired. Ventral median distance only at the 

 anterior part of the body slightly but distinctly larger than the lateral median 

 distances; in general only indistinctly larger {aa>bc). Dorsal median distance a 

 little larger than half the circumference of the body {dd>^ u). 



Nephridial pores at least usually in the lines of setse cd. 



Clitellum in the hinder part ring-shaped, occupying segments 10 — 13 ( = 4). 



Male pores (fig. 2) on transversely oval, very prominent papillae on the inter- 

 segmental furrow lo-i I between the lines of setae b and c, about equidistant from both 

 of them. 



Genital area (fig. 2) . The tenth as well as the eleventh segment bear ventrally a 

 very sharp transverse furrow in about the middle zone. Besides these, which represent 

 apparently sharpened ringlet-furrows, there are very characteristic furrows, which run 

 in general longitudinally and correspond with the seminal furrows of other Oligochaeta. 

 But these furrows of D. sulcata seem not tobe connected with the male pores ; they may 

 perhaps be connected with the female pores which I could not distinguish with certainty, 

 The two sexual furrows begin at the intersegmental furrow 10- 11 just medial from the 

 lines of setae a, i.e., a considerable distance from the male pores. If there is any con- 

 nection with the latter, it must be mediated by certain parts of the intersegmental 

 furrow lo-i I ; but I do not believe that this is the case. The sexual furrows first go 

 backwards nearly straight, only converging very little towards the middle line. As 

 they cross the ringlet-furrow ventrally at the eleventh segment the sexual furrows 

 bend somewhat towards the middle line, from this point converging distinctly. They 

 then meet the intersegmental furrow 11-12 rather near the median ventral line. After 

 crossing, this intersegmental furrow the sexual furrows diverge in the same manner as 

 they, converged before. They finish without sharp points in about the middle zone of 

 the/twelfth segment. The sexual furrows are everywhere surrounded by a somewhat 

 darker smooth area, which forms a distinct interruption of the clitellar modification. 

 At the eleventh segment this darker area occupies the whole ventral part of the body- 

 wall between the sexual furrows, at the twelfth segment it shows a sort of V-figure, 

 in correspondence with the here diverging sexual furrows. At the points where these 

 sexual furrows cross the intersegmental furrow 11-12, I believe that I have seen a 

 pair of very small openings ; but I am unfortunately not able to state this with 

 certainty. It might be inferred that these were the female pores, which in the 

 genus Drawida are constantly found at the intersegmental furrow 11-12. But in 

 general these female pores lie in the lines of setae ah, not medial from these as 

 the questionable and doubtful pores of D. sulcata. Furthermore, I do not know any case 

 of the female pores being connected with longitudinal furrows equivalent to the 

 seminal furrows of many Oligochaetes. As I could not see the real female pores in 

 the usual position, this point of structure must remain questionable. 



