OLIGOCHATA OF TROPICAL EASTERN AFRICA. 259 
loides brunneus has glands of a similar character, but I 
have not studied them in detail. Michaelsen has not men- 
tioned the existence of these glands at all in the two genera 
referred to. In fact, he distinctly states them to be absent in 
the following genera:—Eudriloides, Notykus, Stuhl- 
mannia, Megacheta, and Metadrilus. It is not the case 
that calciferous glands are absent from at any rate two of the 
genera mentioned in the above list. But the glands are so 
little like the usual form of these glands in the Eudrilide that 
it is not at all surprising that their existence has been over- 
looked. 
In Eudrilus and in other genera there are a pair of calci- 
ferous glands in the 13th segment or thereabouts, which recall 
in every particular the calciferous glands of other earth- 
worms. In addition to these there are in Eudrilus, Polyto- 
reutus, Heliodrilus, and Hyperiodrilus unpaired median 
pouches which agree with the calciferous glands in structure, 
and are clearly to be referred to the same category. The 
only ways in which these glands differ from calciferous glands 
are—(1) their unpaired character—which I am not able to 
regard as of importance, and (2) the excessive complication of 
the folded interior of the organ, which is so developed in some 
forms that the lumen becomes partially intra-cellular. Of 
these “‘ Chylus-Taschen,” as Michaelsen terms them, there are 
never more than three. In longitudinal and transverse sec- 
tions of Stuhlmannia, Segments vi—x1r are largely occupied 
by whitish masses on either side of the intestine. These have 
a paired arrangement, there being a pair to each segment. 
The shape of these masses is more or less irregular. They 
are roughly oval with indented margin, as shown in fig. 12; 
they have in certain regions the form of a coiled tube, the 
individual coils being closely pressed together. ‘The diameter 
of each gland varies at different points. The white colour of 
the glands appears to be due to the presence of innumerable 
rounded granules which make up the tissue. ‘hese granules 
suggest the yolk spherules of ova. Lying among them are a, 
comparatively speaking, limited number of small darkly stain- 
VOL. 36, PART 2.—-NEW SER. S 
