234 FRANK E. BEDDARD., 
horn-like processes which meet in the middle line of this 
segment. They end blindly in front. Just at the blind end 
the egg-sac is attached to each whence the oviduct passes out- 
wards, as shown in the figure referred to. The median sac 
formed by the fusion of the two anterior sacs passes straight 
down the body-wall below the ventral blood-vessel and the 
nerve cord. It is a narrow tube, but is rendered conspicuous 
by the fact that it gives off on either side a series of diver- 
ticula. These diverticula are accurately symmetrical. They 
are narrower at their origin from the median sac, and become 
dilated at their free end, which is of course closed. Their 
shape reminds one of the Polian vesicles of the Holothurians, 
In another specimen, also mature, which I dissected, these 
lateral vesicles showed an asymmetry. Those of the left side 
were, with the exception of the fifth, much smaller than those 
of the right side. I regard this as an abnormal or perhaps, in 
spite of appearances, not a fully mature specimen. These 
lateral czeca of the spermatotheca bore a distinct relation to 
the metamerism of the body; there were, in fact, a pair of 
them to each segment. The atria pass between the fifth and 
sixth pairs. The two last pairs are beyond the aperture of the 
spermatotheca. The most anterior pair of diverticula—those 
which bear the egg-sacs—differ from all the rest in being a 
little longer and narrower. I have investigated the minute 
structure of the spermatothecal apparatus in this species by 
longitudinal sections. The first point of importance to be 
noted is that they contain spermatophores exactly like those 
of Polytoreutus magilensis, a species recently described 
by myself in this Journal. 
These spermatophores do not for this reason need any 
particular description. Their distribution, however, is remark- 
able. They do not, as perhaps they might have been expected 
to do, occur in the entire spermatothecal sac. They are 
restricted to the end of the sac, which, as already mentioned, 
‘lies in the 13th segment. These two sacs at the end of the 
spermatothecal sacs are crowded with spermatophores. I have 
also seen spermatophores at the external pore of the spermato- 
