46 
side is not as well developed as that of Stylochiis with its numerous 
tubes, but resembles that of Idioplanoides, Meixneria, and particu- 
larly that of Neostylochus. As a result of its elongated prostate 
vesicle, Limnostylochus occupies a special place within the family. 
As in Meixneria, Cryptophallus, and Parastylochus, two false seminal 
vesicles have been developed, while the other Stylochids have an 
unpaired median seminal vesicle, which, in certain Stylochus-spQcles 
and in Idioplana, is three-lobed. As in most Stylochids, the penis 
is thick, fleshy, and unarmed. Only Neostylochus and Limnostylochus 
borneensis have a penis armed with a stylet. Penis-sheath is absent, 
as is usually the case in Stylochids except in Meixneria. In the 
female apparatus the most marked deviation is the presence of a 
ductus genito-intestinalis. Regarding its derivation from the duet 
of Lang’s glandular vesicle, see above. Lang’s glandular vesicle is 
present in Idioplana, Neostylochus, Idioplanoides, and Limnostylochus, 
and, in the case of the two mentioned last, it is equipped with a 
couple of long anteriorly directed diverticula. Cryptophallus lacks 
Lang’s glandular vesicle, but has instead a ductus vaginalis which 
has a joint opening with the vagina. The same condition oceurs 
in Bergendalia. The genera Meixneria, Parastylochus, and Stylochus 
lack every trace of Lang’s glandular vesicle. In Stylochus, Para¬ 
stylochus, Cryptophallus, and Neostylochus the vagina is very short, 
but has the characteristic forward bend that distinguisbes the aco- 
tylean vagina. In the new genus it is relatively longer. 
The genital giands have the usual location, with ovaries dorsally 
and testes ventrally. Their location has been moved only in certain 
Stylochus-spQcÅQS. The intestinal branches do not anastomose, and 
have their usual beadlike appearance, as, in all Stylochids, but 
the main gut has rather few lateral branches. 
In regard to the arrangement of the eyes, the new genus holds 
a middle position with Stylochus, Cryptophallus, and Parastylochus 
on the one side and Neostylochus on the other. 
The above discussion shows that without doubt the species in 
question is a true Stylochid, but also that, due to the presence of 
various features, it would be difficult to classify it with any of the 
existing genera. It probably approaches Cryptophallus the most. 
This genus has insignificant tentacles, situated far from the anterior 
end, but close to each other. Extremely numerous marginal eyes 
