THE DEVELOPMENT OF PEEIPATUS CAPENSIS. 453 
main portion of the development taking place in a specially 
dilated portion of the generative tube — a portion which may be 
called a vesicula seminalis. 
I have never seen the extrusion of the common terminal 
portion of the system, and I doubt very much whether it ever 
is extruded so as to act as a penis. 
The Female Organs. — The o.varv, though apparently a single 
structure, is in reality paired, and consists of two tubes closely 
applied together. The ova are derivatives of the epithelial 
lining of these tubes. Each ovarian tube is continued into the 
oviduct of its own side. The oviducts are thin-walled, narrow 
tubes, each of which is continued behind into a more dilated and 
thicker-walled tube — the uterus. The uterus is of consider- 
able length and much bent, and unites with its fellow close to 
the single external opening, which lies in the middle line of 
the ventral surface of the hind end of the body, just in front 
of the anus. For figure of female organs, vide Moseley, loc. 
cit., pi. 74, fig. 1, and Balfour, PI. XIX, fig. 33. 
From the above description it is evident that the organs of 
the female, like those of the male, consist of two tubes united 
behind near the external opening but ending blindly in front, 
where the generative products are produced. 
The ovarian parts of the generative tubes are placed between 
the fifteenth and sixteenth pairs of legs, and are united to the 
floor of the pericardium by a delicate band of transparent 
tissue. They, i. e. the ovaries, contain spermatozoa, some of 
which project through the ovarian walls into the body-cavity. 
This condition has been figured and described by Moseley (loc. 
cit., pi. 74, fig. 1). 
The ovaries always contain spermatozoa, but in smaller 
numbers directly after the eggs have passed into the ovi- 
duct than at any other time. This is a very marked feature 
of an ovary, say, of the beginning of April, when compared 
with an ovary from which the ova have just passed into the 
oviducts, say, of the beginning of May, the former being of an 
opaque-white colour to the naked eye, while the latter has a 
much more transparent appearance. 
