6 
W. F. R. WELDON. 
prostate, and outside these is a thick sheath of loosely-arranged 
muscular tissue, the circular and longitudinal fibres of which 
appear to be irregularly mixed. 
I have given in fig. 10 a diagram only of the structure 
described, because in actual preparations the course of the 
ductus is complicated by small secondary twists, perhaps pro- 
duced by the contraction of the creature in dying, which so 
complicate sections as to render many figures necessary if any 
attempt were made to reproduce the appearance actually seen. 
The ovaries lie, as has already been said, one on each side 
of the mouth. Each contains a comparatively small number 
(under twenty) of ova, which lie loosely near to one another, 
but only connected as it were accidentally by the general 
somatic reticulum. 
Each ovum consists of a mass of protoplasm, which is 
granular and deeply-staining in younger, spongy and coloured 
faintly by heematoxylin in older specimens (cf. figs. 2 and 9). 
The nucleus is large and vesicular, having a reticulum which 
in most cases breaks up during the preparation of sections, so 
that the nucleus appears partly filled with a mass of granular 
detritus. The nucleolus is a remarkable rounded structure, 
of considerable size, which appears to consist of a homogeneous 
substance, with a more or less excentric vacuole. The ova are 
surrounded, at any rate for a considerable time, by a delicate 
follicular epithelium, distinct from the surrounding reticulum 
(fig. 9). 
No duct of any kind is observable in connection with the 
ovary, and the only way of escape which suggests itself for the 
ripe ova is the mouth. 
In one specimen an ovum was found in the condition shown 
in fig. 9, with a large and conspicuous nuclear spindle, and 
at one end something which might conceivably be a polar 
body. Whether the dividing nucleus was in this case a pre- 
paration for the extrusion of a second polar body or for seg- 
mentation could, of course, not be determined, but this 
observation points to the existence of some method of internal 
fertilisation as at least probable. 
