Dr. R. Kossman on the Entoniscide. 95 
times dorsad, sometimes ventrad of the aorta. It has its 
greatest extent at the middle imtestine, where the cessation of 
the stomach and the absence of the liver and ovaries leave 
room for its greaterextension. I find it to be least developed 
in the region of the two large ventral protuberances. In the 
pleon it again becomes larger. 
As Fraisse found the ovaries in the fatty body, it is a matter 
of course that he regarded the true ovaries as something else. 
This is the case; and, indeed, it would appear that in doing so 
he has fallen into ¢wo errors. In the adult animal he described 
the true ovarial tubes as “ long ceca’’ in which the older 
ova are deposited; and in this way he explains his remarkable 
notion of the process of oviposition, to which I have already 
adverted (p. 88). In my figure 9 (Pl. IX.) I give a representa- 
tion of these ovarial tubes, in which we can clearly distinguish 
the still very immature and nucleated younger ova (which are 
comparatively rich in plasma, and therefore strongly tinted) 
from the more mature ones (in which the nucleus is invisible 
and the coloured plasma is displaced, with the exception of a 
few drops, by the colourless nutritive vitellus). These tubes 
are not so much strongly branched as rather (as is seen espe- 
cially in young animals, and is also the case in the Bopyride) 
brought tegether in a zigzag form. The older the animal, 
the riper the ova and consequently the longer and thicker the 
sacs become, the more closely do they appear to be packed 
together, so that an insight into their arrangement is no longer 
to be obtained. Anteriorly they extend nearly to the union 
of the liver and intestine, posteriorly to, or even into, the pleon, 
in both directions therefore by no means so far as is stated by 
Fraisse, in consequence of his confounding them with the 
fatty body. 
The two oviducts open laterally in the region between the 
two ventral protuberances, in young animals more ven- 
trally, in older ones, when the ovaries have occupied and 
strongly inflated the ventral surface in the protuberances 
and their neighbourhood, more dorsally. ‘The oviduct is lined 
with a very thick epithelium of tall cylindrical cells, of which 
the nuclei are placed at about half the height of their axis ; 
this epithelium probably here also secretes a cementing sub- 
stance for the deposited ova. i 
Here we have a fresh mistake of Fraisse’s to refer to. It 
is evidently the oviduct with the just-produced ovary of a 
young female that he has taken for the testis and its orifice. 
My reasons for this assertion are as follows :— 
In the first place, except the oviducts, I have found no 
glands opening laterally to the exterior, while, on the other 
