igoS.] W. MiCHAEivSEN : Oligochceta of the Indian Empire and Ceylon. 243 



Setae all on the ventral side of the body, the median dorsal distance being dis- 

 tinctly greater than half the circumference {dd>^u). Setae paired, the ventral ones 

 more strictly than the lateral ones, especially in the vicinity of the male pores. At 

 the rSth segment aa : ab : be : cd=--2 : i : 4 : 3. Towards the head the setae of the 

 ventral pairs become somewhat separated, the distance ab growing nearly as large as 

 aa ; at the 8th segment aa : ab : be : cd=^ : 2 : 5:4. Towards the hinder end of the 

 body the median ventral distance, relatively very small at the anterior part of the 

 body, enlarges, becoming larger than the middle lateral distances ; here aa : ab : be : 

 cd=6 : 3 : 5 : 4. 



First dorsal pores in the intersegmental furrow 11-12. 



Clitellum ring-shaped, occupying segments 14—17 (=4)- 



Male pores on the 17th segment in about the lines of setae a, which are 

 relatively very near each other in the anterior part of the body. 



A common male area surrounds the male pores. The male area is hardly 

 deepened in the middle parts and not sharply bordered, somewhat glandular, 

 transversely oval. 



Female pores doubtless on a ventral median transverse glandular area 

 just before the zone of setae of the 14th segment. 



Spermathecal pores in the intersegmental furrow 7-8, just outside the lines 

 of setae a, which are very close together in this part of the body. 



Copulatory organs: A transverse glandular cushion on each of the interseg- 

 mental furrows 12-13 and 13-14. The cushions are somewhat wide, ^„^^^ 

 being apparently formed by the union of pairs of cushions. The ^ — X, 

 cushion on furrow 13-14 is much narrower than that on 12-13. 



Internal Anatomy. — Septum 4-5 strong, 5-6 very strong, st 

 6-7 and 7-8 missing, 8-9 — lo-ii somewhat thickened, especially 9-10, 

 which is, however, not as thick as 4-5. 



Alimentary tract: A big gizzard between septa 5-6 and 51 

 8-9. CEsophagus swollen in the 12th segment, containing a pair of 



m 



-4^ 



thick lateral calciferous glands with transversely lamellar structure. 



23 



Intestine beginning in the 15th (?) segment, laterally sacculated in 

 the anterior part (with a typhlosole further back ?). 



Circulatory system: Last hearts in the 13th segment. 



Nephridial system micronephric. pj^. „5 



Anterior male organs: One pair of great sperm-duct- Eutyphoeus comil- 

 funnels ventrally in the nth segment, enclosed in a pair of nearly lahnus. 



globular seminal vesicles, which are united in the middle, and communicate each 

 with a broad sperm-sac much incised and lobed at the margins. This pair of sperm- 

 sacs depends backwards as far as into the 14th segment. 



Prostates tubular ; glandular part moderately long, coiled, occupying about 

 three segments; muscular duct relatively short, hardly 2 mm. long, nearly straight or 

 a little undulated. The prostates (the whole organ as well as its various parts) are 

 very much smaller than in other species of this genus. 



