THE STRUCTURE OF CRYPTOGONIMUS 
533 
cular wall encloses the outer organs but does not include the semi- 
nal vesicle. And lastly there are cases like the one at present 
under consideration in which there is no development of a cirrus 
sack at all, so that here organization in this respect is at its 
minimum. 
The ovary, as already noted and as shown in figs. 3 and 4, is 
close to the ventral surface of the bod}^, and opposite to the sper- 
maries. The organ measures 0.09 mm. in length and width, 
0.05 in thickness and is lobed on the surface so as to be divided 
into two lateral portions and an anterior and posterior median 
portion. These indentations are however only a feature of the 
surface of the organ, the interior of the lobes being perfectly 
continuous. 
The oviduct passes nearly directly across the bod3^ Fig. 4 
is a view showing this. It is based on three consecutive sections 
and is slightly diagrammatic. In one of these sections an egg 
happens to have been caught just at the entrance of the oviduct. 
This egg is already completely formed, the ovi-cell and the 
vitelline cells are readih' distinguished and the shell is present. 
There are certain cells present in the spaces around the oviduct. 
They are long and taper toward the beginning of the oviduct, 
and are doubtless the shell gland (shgl of fig. 4). The oviduct near 
the seminal vesicle bends suddenly upon itself and passes ventrally 
as the uterus on the left side of the oviduct. At this bend a pas- 
sage can be seen in sections, to join the oviduct from which point 
of origin it runs ventrally between the oviduct and the uterus. 
The wall of this passage is well supplied with circular nmscle fibres. 
It is parallel sided, can be followed in a few successive sections 
posteriorly and soon ends blindly. There are two organs in 
trematodes with which it is possible to connect this organ: one 
the seminal receptacle, the other the canal of Laurer. The form 
of the organ opposes its identification with a seminal receptacle 
which is of a saccular form and leaves us as the only alternative 
the canal of Laurer. That usually opens to the surface of the 
body dorsally, it also in some forms opens into the intestine. 
Both of these possibilities are excluded in this case as the tube is 
not running in either of these directions, when after having been 
THE JOURNAL OF EXPERIMENTAL ZOOLOGY, VOL. 9, XO. 3. 
