OLIGOCHATA OF TROPICAL EASTERN AFRICA. 24,7 
muscular walls. They open quite dorsally close to the median 
dorsal line of each side of the body. This is a remarkable 
but not unknown position for the spermatothecal pores. 
Another instance of a similar position, which occurs to me, 
is in the species Allolobophora fetida. 
Other facts in the anatomy of the worm which are of some 
little importance are the following. 
The prostomium is, as is indeed usual, covered with a 
thick columnar epithelium. This thickened pad is prolonged 
for a very short distance into the mouth-cavity. This epithe- 
lium is very possibly of a sensory nature. The ccelom is, of 
course, divided up by transverse septa into a series of chambers. 
Some of the septa which divide these chambers are thicker 
than others. The first of these thickened septa divides Seg- 
ments 1v/v. The following seven septa are, with the exception 
of that which divides Segments x/x1, also thickened. The next 
septum to the last of the specially thickened septa is rather 
thicker than the excessively fine septa which separate the 
following segments. As in so many of the lower Oligocheta, 
there are septal glands present; these glands commence in 
the present species in the 5th segment, and the last pair were 
observed in the 9th. The brain hes in the 3rd segment. 
From the brain one among several nerves which pass forward 
ends in a medianly situated ganglion in close juxtaposition to 
the epithelium of the prostomium, which consists of but few 
cells. A median ganglion in this position has not, I believe, 
been described as existing in any earthworm, but it has been 
met with in certain aquatic Oligochzeta belonging to the family 
Tubificidee. In this family Stolc! has figured such a ganglion 
in Bothrioneuron and in Lophocheta. 
The alimentary tract has no traces of a gizzard. The 
cesophagus does not appear to be at all vascular; it termi- 
nates in the 18th segment, in which segment begins the 
intestine. There are no glands of any description appended 
to the alimentary tract unless the septal glands can be referred 
to this category. 
1 “ Monogr. Ceskych Tubificidu,” ‘Abh. bohm. ges.,’ 1888. 
