148 Memoirs of the Indian Museum. [Voi,. 1, 



Head prolobous. 



Setae strictly paired. Median ventral distance a little smaller than the middle 

 lateral ones {aa = ca.. f be). Median dorsal distance a little larger than half the cir- 

 cumference {dd =ca.. f u). 



Nephridial pores in the lines of setae d. 



Dorsal pores apparently absent. 



Clitellum ring-shaped, occupying segments 10 — 13 (=4). 



Male pores on prominent transversely oval papillae on the intersegmental furrow 

 lo-ii, about midway between the lines of setae b and c. - ' 



Female pores in the intersegmental furrow 11- 12 in the lines of setae b. 



Spermathecal pores in the intersegmental furrow 7-8 just ventral from the 

 lines of setae c, touching these lines with the superior end of the slit-like external 

 opening {D. uniqua : between the lines of setae c and d). 



Copulatory organs: Some of the mature specimens (four out of eight) are 

 provided with two broad, transversely oval glandular cushions, median, ventral, on 

 segments 7 and 8. 



Internal Anatomy. — Septa 5-6 — 8-9 very strong, especially the two anterior 

 ones. Septa 9-10 and lo-ii dorsally dislocated backward for about half a segment's 

 length. 



Alimentary tract with four big gizzards behind the genitar region. , 



Nephridial system meganephric. 



Male organs: One pair of oblong seminal vesicles on septum 9-10, depending 

 from it, forwards and backwards, into the 9th and loth segments. In each seminal 

 vesicle is a-' great tuft-shaped test, "fixed by a narrow, short stalk to the wall of the 

 seminal vesicle in the ventral part of the zone, marked by septum 9-10. Behind 

 the point of attachment of this test a fiat sperm- duct-funnel interiorly tapestries the 

 ventral wall of the seminal vesicle. The sperm-ducts are very long, coiled, in segment 

 II. The prostates are rather long, tube-like, bent forward to form an U-shaped loop. 

 The sperm-duct enters the proximal end of the prostate. 



Female organs: Ovaries and oviduct-funnels apparently enclosed in an 

 ovarian chamber, formed by septa lo-ii and 11-12 and a connective membrane (?). 

 Irregular egg-sacs depending backwards from septum 11-12 through some segments. 



Spermathecae (fig. i) : Main pouch in the 8th segment, consisting of a somewhat 

 irregular pear-shaped ampulla and a long, narrow, irregularly bent, nearly coiled duct. 

 This duct, piercing septum 7-8, enters from behind the distal end of the atrial chamber. 

 The atrial chamber, narrow at the distal end, is continued proximally into a large, 

 flattened, proximally broadened atrial sac, which extends into the 7th segment. The 

 narrow distal part, which describes some narrow and short undulations, is not set ofi 

 abruptly from the broader sac. The whole atrial chamber as well as the atrial sac 

 shows a rather regular annulation, externally marked by fine, but distinct, transverse 

 furrows, internally marked by densely crowded foldings of the epithelium, the folds 

 depending broadly into the lumen of the sac. {D. uniqua : atrial sac [copulatory 

 pouch of BOURNE] simple.) 



