igo8.] W. MiCHAEi^SEN : Oligochceta of the Indian Empire and Ceylon. 



237 



Ä 



St 



-£- 



Male pores on the I7tli segment about in the lines of the ventral pair of setse, 

 in deep grooves, each of which is surrounded by a broad wall forming three quarters of 

 a circle. The medial ends of these walls converge and unite forward and the enclosed 

 space opens forward. Two deep furrows issue from the grooves of the male pores and, 

 converging somewhat in going forward, lead to a pair of somewhat depressed, 

 transversely oval, nearly circular glandular areas which lie in the intersegmental 

 furrow 16-17 in the lines of setse a, but which slightly surpass these lines towards the 

 ventral median line, while in the other direction they extend nearly as far as the lines 

 of setae h. 



Female pores before setse a on the 14th segment. 



Sperma thecal pores one pair in the intersegmental furrow 7-8 between the 

 lines of setae h and c between two broad, but not sharply bordered, somewhat promi- 

 nent, transverse walls. 



Copulatory organs: Besides the constantly present glandular areas on the 

 intersegmental furrow 16-17 mentioned above, there is, almost constantly, a pair of nar- 

 rower, nearly slit-like depressed areas before the male pores in the intersegmental 

 furrow 15-16. In one specimen these are represented only by a single unpaired area, but 

 at the same time there is an additional unpaired one on the same side 

 in furrow 14-15 ; in another specimen there is an unpaired one in 14- 

 15 besides the complete pair in 15-16. Similar transverse glandular 

 areas with an eye-shaped periphery are constantly lying behind the 

 male pores, somewhat variable in number, the first pair always on 

 the intersegmental furrow 18-19. In two specimens there are two 

 pairs on 18-19 ^^^ ^Q'^o, in two specimens three pairs on 18-19, 

 19-20 and 20-21, in the two remaining specimens the pair of 20-21 

 or those of 19-20 and 20-21 are represented only on one side, in the 

 last there was only an unpaired one on 19-20 besides the complete 

 pair on 18-19. 



Internal Anatomy.— Septa 4-5, 5-6 and 8-9— lo-ii very 

 much thickened, 6-7 and 7-8 rudimentary if not missing. 



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

 CEsophagus in the 12th segment swollen, globular, containing a 

 pair of big, bean-shaped calciferous glands depending from the wall 

 into the lumen of the oesophagus. Intestine in the fore part sacculated laterally, 

 further back with a big, simple typhlosole, triangular in a transverse section, with a 

 broad base. 



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



Nephridial system micronephric. 



Anterior male organs: A pair of great sperm-duct-funnels in the nth seg- 

 ment enclosed in a common ventral seminal vesicle, which at each side extends 

 forward as far as septum lo-ii to enclose the testes also. The seminal vesicles com- 

 municate with a pair of very large and very much lobed sperm-sacs depending from 

 septum 1 1- 1 2 into the 12 th segment and some of the following ones. 



MM 



23 



Fig. 33. 

 Eutyphneus basti- 



anus. 



