1908.] W. MiCHAEi^SEN : Oligochœta of the Indian Empire and Ceylon. 207- 



Colour uniformly grey. 



Head epilobous (about ^). Some of the segments of the anterior part of the 

 body divided into two (segments 2 — 4) and some (segments 5 et seq.) into three ringlets 

 by one or two ringlet-furrows. . 



Setae very delicate, in general paired, but not very strictly, the lateral ones less 

 so than the ventral ones, which are distant one from the other for about | of the 

 middle lateral or the median ventral distances {aa=bc, cd = ^bc, ah=\hc). Median 

 dorsal distance larger than half the circumference of the body {dd > ^ u). Setae of 

 the first segments more separated (here cd = bc or even a little larger, ab =fôc). 



First dorsal pore in the intersegmental furrow 12-13. 



Clitellum not yet quite distinct (occupying the segments 13 — 17 (=5) as in 

 var. chaperi ?). 



Prostate pores on the 17th and 19th segments in the lines of setae b, on very small 

 circular papillae ; the male papillae of eachiside are connected by a sharply marked seminal 

 furrow. The seminal furrows curve towards the median ventral line. The whole male 

 area, limited by the male papillae and the seminal furrows, is somewhat, but not much 

 depressed. The body- wall in the neighbourhood of the male area is somewhat thickened . 

 Male pores apparently in the seminal furrows on the middle zone of the i8th 

 segment. 



Female pores not seen. 



Spermathecal pores rather inconspicuous, two pairs, at the anterior part of 

 the 8th and 9th segments on the anterior ringlet-furrow between the lines of setae a and 

 b, somewhat nearer to the former. 



Copulatory organs: A single median ventral very prominent cushion on the 

 intersegmental furrow 13-14, occupying the last two ringlets of the 13th segment and the 

 first ringlet of the 14th segment; copulatory cushion broader than long, laterally 

 reaching nearly as far as the lines of setae d, with convex anterior margin and concave 

 posterior margin. 



Internal Anatomy. — Septa 7-8 — 13-14 thickened, 9-10 — 11-12 very strong, 

 the others gradually less strong. 



Alimentary tract: A very large gizzard before septum 7-8, in the 7th, 6th 

 or 5th segment. (Ösophagus with one pair of very large calciferous glands, which open 

 into the oesophagus in the 15th segment, but reach from here into the i6th segment. 

 The calciferous glands are of rather complex shape, consisting of a number of parts, 

 which are separated from one another by deep incisions and constrictions. 



Circulatory system : Last hearts in the 13th segment. 



Nephridial system micronephric. 



Anterior male organs: Two pairs of sperm -duct-funnels free in the loth 

 and nth segments. Two pairs of sperm-sacs depending from septa lo-ii and 11-12 

 into the nth and 12th segments. Those of the posterior pair are larger, much 

 divided, grape-like, those of the anterior pair are smaller, simple sack-shaped - 



Prostates tubular, restricted to the 17th and 19th segments. Glandular part 

 moderately thick, much bent, nearly coiled ; duct shorter, but relatively long, thin, 

 irregularly bent. 



