iQi?'] J- Stephbnson : Indian Oligochaeta. 371 



Setae closely paired ; aa is rather less than be ; dd is equal to 

 half the circumference. 



Nephridiopores apparently in line with setae d. 



The male apertures are indistinct, in groove lo/ii, between b 

 and c their centre rather nearer to c ; they are slit-like, and their 

 lips are not swollen. 



I could not distinguish the female apertures. 



The spermathecal apertures are in groove 7/8, their centre 

 just below the line of setae c. 



The clitellum takes up segments x- xiii=4 ; its hinder end is 

 ndistinct. 



There are a few very slightly marked darkish papillae on the 

 genital region, distributed as follows : — On segment vii a pair, 

 dorsal to d and just behind the level of the setal bundles ; on x a 

 pair, below c and just in front of the level of the setae ; on xi a 

 single papilla, just behind groove lo/ii and between the lines b 

 and c but nearer to c. 



Internal anatomy . —'^e^to. 5/6 and 6/7 are much strengthened; 

 yj^ and 8/9 much less so, — only moderately stout ; 8/9 is bulged 

 forward by the testis-sacs. Septum 9/10 is thin, and is attached 

 to the body-wall at the middle of segment x (according to the 

 external grooves). 



The gizzards are three in number, in segments xv, xvi, and 

 xvii ; they are separated from each other by soft annuli. 



The last heart is in segment ix ; on one side in this segment, 

 deeply situated on the intestine, there was an additional com- 

 missure. 



The testis-sacs are irregular in shape, and asymmetrical, the 

 right being rather anterior to the other, and extending across the 

 middle line in front, while the left extends considerably further 

 back; they are suspended by septum 9/10, but the greater part of 

 the right sac is in ix, and of the left in x, — indeed the hinder end 

 of the left sac is on a level with groove 11/12. On opening one of 

 the sacs the flocculent matter was found to be very adherent to 

 the inner surface of the wall ; it would seem that the inner surface 

 proliferates over the greater part of its extent, the testis being 

 diffuse. A folded mass on the wall, at the place where the vas 

 deferens leaves the sac, probably represents the funnel along with 

 compacted spermatozoa. 



The vas deferens is narrow and much convoluted ; it leads 

 down from the testis-sac to the prostate, which it joins at about 

 the middle of its length. The prostate is soft and glandular-look- 

 ing ; it is elongated, and bent with the angle directed forwards ; 

 the ental end is wider than the ectal, so that if it were straight it 

 would be described as club-shaped. 



Septa lo/ii and 11/12 are separate from each other at the peri- 

 phery by the ordinary length of a segment ; hence on opening the 

 worm the ovarian chamber is opened up, and numerous small ova 

 fall out ; the chamber is closed below (around the alimentary canal), 



