OLIGOCHATA OF TROPICAL EASTERN AFRICA, 241 
lensis is increased by the fact that the immature worm 
exhibits the same condition. The funnels of the sperm-ducts 
were by no means so prominent as in the fully mature worm; 
they, of course, occupied the same position. The only other 
part of the male apparatus that was visible were two little 
sacs lying one on either side of the extremity of the spermato- 
thecal sac. Ido not think that these were the immature sacs 
of the penial setz of a species of Polytoreutus provided with 
these structures. It seems, therefore, that the first rudiment 
of the terminal apparatus of the male ducts is double, which is 
so far a demonstration that originally this apparatus was 
double. Beyond these two minute sacs nothing was visible of 
the male efferent ducts. On the other hand, the spermatothe- 
cal sac was as well developed as in the mature worm. It 
showed no differences that I could detect from the structure 
already described. There was, however, no sperm in the sac. 
We may, therefore, note that the female apparatus is de- 
veloped before the male, and that the sperm-sacs are the first 
part of the male apparatus to reach maturity. 
Polytoreutus Finni, n. sp. (figs. 6, 17). 
I have unfortunately only a single specimen of this worm 
for examination. It is extraordinarily long and thin—perhaps 
I may say even for an Eudrilid. The preserved specimen 
measured 183 mm. by 3 mm. in breadth at the clitellum, which 
is distinctly broader than any other region of the body. The 
worm consisted of rather more than 500 segments, a most 
unusual number. The clitellum is exceedingly conspicuous, 
being raised above the level of the surrounding segments; it 
occupies Segments x111—xvill. It is quite complete except 
for the area which lies between the genital pores. The genital 
pores (fig. 17) are, as is usual with this genus, situated on 
the 17th, and on the boundary line between the 18th and the 
19th segments respectively. These apertures are very large 
and prominent, and are surrounded by thick tumid lips. The 
integument at the actual orifice is marked by numerous slight 
furrows which have a radiate arrangement. These pores, 
