44 
might indeed feel that, in respect to the demands that might be 
put to it, this musculature is too well developed. It exceeds the 
muscularis of the vaginal wall, as well as the muscular wall of the 
body, both in thickness and in the coarseness of the fibres. 1 am 
inclined to believe that the more intensive stain of the fibres in 
comparison with other musculature of this animal is due to their 
contracted condition. This supposition is confirmed by the appearance 
of the siender cells in the epithelium of the duet as well as gaps 
in the surrounding parenchymatous tissue. From this faet one may 
conclude that the spaciousness and capacity of the duet is consider- 
able. It seems plausible that the duet is first of all intended for 
sperma. However, the presence of eggs and egg-fragments in the 
intestine shows that the animal, through the existence of this duet, 
can utilize a part of its own egg-material as food. In this way 
the animal would economize to a very extensive degree and eggs 
or parts of eggs not adaptable for deposit would thus not be wasted. 
The muscularis of the ductus g. i. has the same appearance all 
the way to the intestinal wall, only diminishing in strength, and, 
consequently, this muscularis does not form any special sphineter. 
However, just where the ductus g. i. joins the intestinal wall a 
sphineter is present, in the form of a circle of muscular fibres, 
which lie close to the wall of the intestine. But they seem more 
likely to belong to the muscular sheath of the intestine than 
to the duet. 
As is partly seen already in the schematic figure (text-fig. 13), 
the ductus genito-intestinalis empties into an intestinal branch. The 
photographed sections are paramedian, since one of the laterally 
located false seminal vesicles is found more anteriorly on the 
same sections. In reality the main gut ends a short distance 
caudal to the female genital pore and sends out two backward 
running branches. The main gut does not show any beadlike 
compressions with muscular sphineters during its course through 
the pharyngeal as well as the post-pharyngeal zone. Such, however, 
are always present in the intestinal branches. Thus the ductus 
genito-intestinalis does not enter the main gut, but, instead, one 
of the two most posterior intestinal caeca. Therefore, one cannot 
expect to find the most caudal part of the ductus g. i. on the 
median sections. 
