OLIGOCHATA OF TROPICAL EASTERN AFRICA. 205 
this group. The setz begin on the 2nd segment; they are 
strictly paired, and rather small in size, of the usual form, 
without any ornamentation. The two ventral pairs are rather 
further apart from each other than is either of them from the 
lateral pair of its side, but all the sete are distinctly upon the 
ventral surface of the body. They appear to be absent from 
a few segments of the body. I did not find the ventral pair 
on the 13th segment on either side of the body, nor were there 
any traces to be discovered on any of the clitellar segments of 
either ventral or lateral pairs. They re-commence just on a 
level with the posterior boundary of the male papilla. 
The clitellum is saddle-shaped. It occupies the Seg- 
ments x1v—xvil. The median ventral area which is not part 
of the clitellum is chiefly occupied by the prominent pores of 
the reproductive organs. The whole area is hour-glass-shaped, 
being narrower in the middle than at either of the two ends. 
Independently of the very prominent papille which bear the 
reproductive orifices, there is a single papilla upon the 11th 
segment of an oval form. It lies on the posterior half of the 
segment, just causing a slight convexity of the boundary line 
between this segment and the 12th. The papilla les entirely 
between the ventral sete. It ends on each side just on a level 
with the inner of the two set of that pair. The transverse 
diameter of the papilla is greater than its antero-posterior 
diameter. The median spermatothecal pore lies on the 
line between Segments x111/x1v. The actual orifice itself is 
circular and not large, not so large as the male pore. It is 
borne upon a very prominent swelling of the body-wall, which 
may extend as far forwards as the posterior boundary of Seg- 
ment x11. In some specimens the terminal section of the 
spermatothecal sac is protruded from the aperture. 
The oviducal pores are not conspicuous until the worm is 
carefully examined with a tolerably high power of the micro- 
scope; they are invisible under a low power; each aperture is 
on the 14th segment; it lies in a position exactly correspond- 
ing to the lateral setz. 
The single median male pore is a Danspersely elongated 
