446 THOS. H. MONTGOMERY jr., 
“Biersack”, and the term “uterus” as he has used it. The term 
“ovary” as used by VEJDOVSKY would apply to only the earliest single- 
lobed stage of the germinal epithelium; but since this epithelium 
always forms a continuous sack around the ova, so that the latter do 
not escape from it into the body cavity, its cavity must be inter- 
preted as the ovarian cavity, and hence the whole organ as an ovary, 
even though the earliest proliferation of the ova may proceed from 
its medial side alone. This can be deduced even from the mature 
stage, when one considers the appearance of the ovaries when they 
are empty. Hence in Paragordius the term “Eiersack” is fully equi- 
valent to ovary. As for the name “uterus”, I have used VEJDOVSKY’s 
term simply in order not to introduce a new one; but it is not 
strictly an uterus, since the ova are not fertilized within it nor do 
they undergo their development there (except the first maturation 
division). Its function is simply to conduct the ova to the cloaca and 
so to the exterior. A very different morphological interpretation of 
the ovaries and the uteri seems to me to be demanded, in view of the 
fact that both are lined by the same germinal epithelium. This is, 
that in Paragordius the whole uterus of one side of the body together 
with the ovaries attached to it may be considered one ovary, so that 
there would be present a single pair of very long ovaries, each with 
lateral segmental diverticula. The whole relations of these parts in 
the adult condition bear out the correctness of VEJDOVSKY’s ob- 
servations on the development, for he found that the germinal epi- 
thelium first proliferates ova within the uterus, at the points where 
the latter becomes laterally bulged out. Hence I would interpret the 
ovaries of Paragordius as a single pair of very long tubes lined 
throughout by the germinal epithelium, with segmental lateral points 
of proliferation for ova on each, these growth zones becoming finally 
bulged outwards into the lateral body cavity in the form of the 
ovaries or Eiersäcke as these terms are used by VespovskY. This 
interpretation brings the female egg-producing organs under the same 
aspect as the male sperm-producing, the main difference in the male 
being that the testes do not have lateral diverticula. 
Accordingly it is only for convenience in description that I have 
distinguished the main tube and the lateral diverticula of the true 
ovary, as uterus and ovaries respectively. 
The oviducts. These (Ovi Figs. 68, 70, 75, Pl. 41; Figs. 78, 
79, Pl. 42) are the narrowed posterior ends of the uteri. They ex- 
tend straight backward to the plane of the anterior end of the atrium 
