igoS.] W. M1CHAE1.SEN : Oligochœta of 'the Indian Empire and Ceylon. 195 



Male pores on nearly circular, smooth papillae, which are placed on a great 

 transversely oval, nearly circular, rough protuberance. The latter occupies the whole 

 length of the i8th segment. The male pores are distant one from the other about 

 a quarter of the circumference of the body. There are about fifteen setae between 

 the male pores. 



Female pore (or pores) on a small oval median ventral area in the zone of 

 setae of the 14th segment. 



Spermathecal pores two pairs ventro-lateral in the intersegmental furrows 

 7-8 and 8-9, those of each pair distant one from the other about f of the circumference 

 of the body. 



Copulatory organs are missing. 



Internal Anatomy. — Septa 7-8 moderately strong, 8-9 and 9-10 missing, 

 10- 1 1 and 1 1- 1 2 moderately strong, 12-13 and 13-14 somewhat stronger, but not very- 

 strong. 



Alimentary tract: A big gizzard between septa 7-8 and lo-ii. Intestine 

 with a pair of long, simple lateral caeca stretching forward for about four segments 

 and tapering towards the blind end. Behind the point of origin of the caeca begins a 

 simple crest-shaped t5rphlosole. 



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



Nephridial system micronephric. 



Anterior male organs: Two unpaired, semi-circular, anteriorly convex 

 seminal vesicles in the 10th and nth segments in the median ventral line beneath 

 the oesophagus, completely separated one from the other, each unpaired seminal 

 vesicle representing a pair, united completely in the median line. Two pairs of 

 somewhat granular sperm-sacs depend from septa lo-ii and 11-12 into the nth and 

 1 2th segments and communicate with the seminal vesicle of the preceding segment. 

 Each sperm-sac bears at the top a rather large, shortly -stalked appendix of some- 

 what different appearance (of lighter colour). 



Prostates: The glandular part, which is loose and tuft-like, occupies segments 

 19 — 23. Kach branch of the tuft is long and rather narrow, irregularly restricted 

 and partly lobed, granular. The duct is thickened and muscular in the distal two- 

 thirds of its length, thinner in the proximal third. It forms an S-shaped double loop. 

 There are no distinct copulatory pouches. Before each prostate is situated an 

 accessory gland which resembles in appearance and in structure rather a 

 Pheretima-'^rostdJiQ. than the real prostate of this species. Its glandular part, which 

 occupies segments 16 — 18, is more compact than that of the real prostate, irregular, 

 moderately thick and disc-shaped, much incised and granular. It differs from the 

 accessory glands of Ph. osmastoni (see above), the small divisions of the gland having 

 no distinct ducts. Its duct, which is proximally rather thin, distally somewhat in- 

 flated, opens to the exterior before and more ventrally than the prostate. 



Spermathecae (fig. 25) : Main pouch with a sac-shaped ampulla and a duct 

 which is moderately sharply setoff from the ampulla. The duct is somewhat shorter 

 than the ampulla, about half as thick in the proximal part and much thickened and 

 inflated in the distal part. This distal part of the duct bears a number of irregular, 



