igoS.] W. Michaelsen : Oligochœta of the Indian Empire and Ceylon. 197 



areas is somewhat larger than the distance between them, which bears 4 to 8 setse. 

 The border of each of these areas is sharply marked. The surface is smooth and some- 

 what depressed or elevated, and shows a dark ground colour with numerous lighter 

 spots which are situated so densely that the ground colour is reduced to a reticulation. 



Internal Anatomy.— Septa 4-5—7-8 and lo-ii a little thickened, 11-12 — 

 13-14 rather more thickened, 8-9 and 9-10 missing. 



Alimentary tract: A great gizzard between septa 7-8 and lo-ii. CEsopha- 

 gus simple, without calciferous glands. Intestine without typhlosole, with a pair 

 of caeca. The caeca are simple and slender ; they are suspended by a broad base 

 from the intestine in the 26th segment and extend forward into the 22nd segment. 



Circulatory system: Dorsal vessel simple, provided in the region of the 

 intestine with disc-like, shortty-stalked blood-glands, — a pair to a segment, I^ast 

 hearts in the 13th segment. 



Nephridial system micronephric. 



Anterior male organs: Two pairs of nearly globular seminal vesicles 

 of equal size in segments 10 and 11 each containing a great sperm-duct-funnel. The 

 seminal vesicles of each side as well as those of each pair are connected by a very 

 short and very thick intermediary process, the whole having the appearance of a 

 thick tubular ring with four regularly arranged globular swellings. Bach sperm-reser- 

 voir communicates with a great, compact sperm-sac in the following segment (the 

 nth and 12th segments). The sperm-sacs show some slight fissures. 



Prostates: Glandular part occupying segments 17 — 19, having many fissures 

 and divided by deep incisions into some only loosely connected parts. Duct moderately 

 long and uniformly thick , bent strongly but not always regularly. The ducts of the 

 prostates open directly , without copulatory pouches, laterally from a pair of glandular 

 cushions which correspond with the circular male areas mentioned among the external 

 characters. The sperm-ducts enter the proximal erid of the duct of the prostates. 



Female organs: A pair of ovaries and oviduct-funnels free in the 13th segment. 

 A pair of egg-sacs in the 14th segment suspended at septum 13-14. 



Spermathecae (fig. 28) : Ampulla of main pouch bulb-shaped, proximally 

 narrowed. Duct of main pouch abruptly set off from the ampulla, half as long and 

 proximally one-third as thick as the ampulla, distally narrowed. At the distal part 

 of this duct enters a very long and very thin tube-like diverticulum, the proximal end 

 of which is slightly swollen. The diverticulum is irregular!}^ bent and curved, nearl}^ 

 coiled. In situ it does not reach the tip of the main pouch, but if extended it 

 would be two or three times as long as the main pouch. 



Hab. — Andaman Islands. 



Remarks. — The anterior male organs of Pheretima sudoria agree with 

 none of UDE's schemes,' as the seminal vesicles not onty of each side but also of each 

 segment are connected. 



' H. UDE, Terricole Oligochäten von den Inseln der Südsee und von verschiedenen anderen Gebieten 

 der Erde ; in Zeitschr. wiss. Zool., Ixxxiii, p. 403, ff. 



