igo8.] W. MiCHAELSEN : Oligochceta of the Indian Empire and Ceylon. 



241 



^^ 



Male pores on the 17th segment a little lateral from the lines of setae h, small 

 openings each surrounded by a small ring-shaped wall. 



A median ventral male area of hexagonal form present, extending longitudinally 

 as far as the middle zones of segments 16 and 18, and laterally nearly as far as the 

 lines of setae c, the anterior and lateral borders often marked by a wall, the posterior 

 limit sometimes not so well marked, in which case the hexagonal form is not complete. 

 The ring-shaped walls of the male pores lie within the lateral angles of the male area 

 and are connected by a transverse wall. The space between this transverse wall 

 and the anterior wall of the male area is often depressed, and sometimes also the room 

 behind this transverse wall. 



Copulatory organs : A single great median ventral cushion or area re- 

 sembling the male area in outline and lying just before it on the intersegmental furrow 

 15-16. It is a little smaller than the male area, but corresponds closely with the space 

 within the bordering wall of that area. It is of transversely oval or 

 hexagonal shape, and extends longitudinally between the zones of 

 setse of the 15th and i6th segments and laterally to midway between 

 the lines of setae h and c. It is bordered by a small wall or by a 

 furrow, depressed or somewhat prominent, according to the state of 

 puberty. 



Female pores varying somewhat in position, just before, or 

 before and closer togsther than, the setae a of the 14th segment, on a 

 common transverse median area. 



Spermathecal pores one pair on the intersegmental furrow 

 7-8 between the lines of setae h and c. 



Internal Anatomy, — Septa 4-5 and 5-6 very strong, especi- 

 ally 5-6 which is nearly as thick as the body- wall. Septa 6-7 and 7-8 

 missing, 8-9 — 10- 11 somewhat thickened but far less so than 

 4-5- 



Alimentary tract: A big gizzard between septa 5-6 and 8-9. Oesophagus 

 swollen in the 12th segment, with a pair of thick calciferous glands which occupy the 

 whole of the lateral part of the oesophagus but are not set off from it. The calciferous 

 glands are separated from one another by a median longitudinal furrow, but they 

 meet ventrally. Intestine begins in the 15th segment, laterally sacculated in the 

 anterior part. 



Circulatory system : Dorsal vessel simple ; last hearts in the 13th segment. 



Nephridial system micronephric. 



Anterior male organs: One pair of great sperm-duct-funnels ventrally in the 

 nth segment, enclosed in a common seminal vesicle. One pair of great, broad sperm- 

 sacs, much incised and lobed at the margins, communicate with the seminal vesicle 

 and depend backwards as far as into the 15th segment. 



Prostates tubular; glandular part very long, very much coiled, but notforminga 

 compact mass, reaching backwards as far as into the 24th segment; duct thinner 

 relatively long, describing one or two large loops. 



F G. 35. 



Eutyphoeus scuta- 



rius. 



