254 D r . Schreibers’s Description of 
with the mesentery : these unite together, and terminate in a 
narrow hollow viscus, about half an inch long, and impervious 
at its broader end. Its substance seemed to be composed of 
small glands. In one of the specimens, it had the appearance of 
a transparent membranous bag, containing a mass of small 
glands, or little eggs, of the size of a grain of millet, conglu- 
tinated together. 
Below the heart, in the thorax, there is a bag about one inch 
long, of a very simple and thin membrane, without any appa- 
rent vessel. The upper end of this bag is round and impervious: 
the lower end terminates in two ducts, of which the right, 
accompanied by a blood vessel, runs down under the liver, and 
is connected to its outer edge by a membrane, until it reaches 
the middle of the body, where it grows wider, and terminates 
in a small oval membranous bladder. In one specimen, this 
bladder was very small, and semilunar. The blood vessel 
accompanying the duct goes as far as the middle of this 
bladder, then separates from it, joining with the membrane of 
the mesentery ; thus forming the beginning of the ovary on 
this side, after having received some small branches of the 
vessel coming from the liver to the mesentery. The bladder 
itself terminates in a sharp point. The duct on the left side 
runs down like the former, but under the stomach, to which it 
is fastened by a membrane : it runs lower down in the belly 
than that on the right, and terminates in an oblong bladder, of 
the same shape and structure as the former, but always consi- 
derably larger. 
The blood vessel which comes to the bladder along with its 
duct, divides into two branches : one runs over the surface of 
the bladder, is very large, and divides into numerous branches 
