107 
In the interior of the prominence, undoubtedly answering to a 
penis, the prostatic vesicle is located transversely to the body. On 
Plate IV, Fig. 22, it appears in trans-section. The muscular envelope 
of it is not very obvious, as the fibres are sparse and also loosely 
arranged. Thus it does not stand out from the surrounding tissue. 
The interior of the vesicle is lined with a glandular epithelium, 
which is not folded (Plate IV, Fig. 22, pre). Extra-capsular prostatic 
giand cells are also present. Although large, this prostatic vesicle 
does not on the whole have the appearance common for the genus 
Stylochus. A quite singular feature is the occurrence of an enormous 
amount of cyanophilous giand cells. These lie all around the prostatic 
vesicle, reaching far away on the sides and also to the dorsal 
muscle Wall. Most of them empty their secretion, in the form of 
minutc granules, on the surface of the penis, but many also in 
the antral wall in the neighbourhood of the prominence (Plate IV, 
Fig. 22 and text-fig. 9). The giands invest the tissues to such an 
extent that in hematoxylin-eosin stained sections this part of the 
body looks dark blue. A mass of this secretion is present in the 
antral lumen (Plate IV, Fig. 22). It is not impossible that the 
secretion may be called upon to form spermatophores, but in this 
respect no direct observation can, in any event, be related. How- 
ever, if this be the case, there is no need for the penis-like pro¬ 
minence to be intromitted into the vagina. To judge from the size 
of it, this implement seems rather large for the vagina. 
The uteri are unbranched. As full female maturity has not as 
yet been reached, they appear as straight-running, narrow tubes 
of considerable length. 
In its main features the female apparatus agrees fairly well 
with that of the genera Stylochus and Par asty lochus. The mus- 
culature is, however, rather weak, especially in its outer part 
(Plate IV, Fig. 22). Other details are readily understood from 
text-figure 9. 
It remains to mention that a close inspection of the female 
apparatus has made it possible to detect a not very outstanding 
feature. Near the proximal end of the vagina, where it is bent in 
a forward direction, there occurs on the ventral side a depression 
in the epithelium. At this place, and joined to the depression, a 
double string of cells starts, which runs to the distal limb of the 
