OLIGOCHATA OF TROPICAL EASTERN AFRICA. 253 
The setz are strictly paired, and are not in any way orna- 
mented. The pairs are equidistant, and are all of them 
decidedly ventral in position. The only modification of the 
sete occurred on the 17th and 18th segments. On both of 
these segments only one ventral seta was present on each 
side; the remaining seta appeared to be the outermost of each 
pair. 
The atrial pores are two pairs, which open on both 17th and 
18th segments. Lach pore is situated in a groove with raised 
and somewhat folded margins, which connects the two pores of 
each side. 
The oviducal pores lie alittle to the outside of the outermost 
seta of each ventral pair. 
The spermatothecal pores occupy a corresponding position 
between Segments vi1/ViE, vitt/Ix. 
The clitellum occupies Segments x1v—xvitt, and is complete 
except over the area lying between the atrial pores. 
The nephridiopores lie in front of the inner seta of the outer 
pair. 
The alimentary canal shows the structure which is charac- 
teristic of this genus. 
In Segment 1x is the median ventral calciferous gland, which 
to describe would be merely to recapitulate my description of 
other species. From the 9th segment the walls of the cesopha- 
gus are highly vascular; the intestine begins in the 13th 
segment; the intestine is not at first so regularly constricted 
in successive segments as it is posteriorly, and appears to be 
of a rather wider calibre. The ciliation of the cesophagus 
commences just in front of the opening of the calciferous 
pouch. 
The first distinct septum separates rv/v; this septum is thin, 
but the four following are thickened ; the next three se pta, 
though thinner than those which precede them, are thicker than 
those which follow. 
As in other species, there are masses of unicellular glands in 
the neighbourhood of the pharynx, which have been termed by 
myself and others “septal glands,” on the view that they 
