256 
SUPPLEMENT 
cardia alone is very apparent by the difference of volume in 
the oesophagus. Two blind vessels, rather short and thick, 
which lead to the stomach, have been considered by some 
naturalists as coeca, and by others as replacing the liver. 
From the end of the stomach, the intestinal canal proceeds 
pretty directly to the anus. Its diameter is then nearly equal 
throughout, and sometimes very inconsiderable- Sometimes, 
towards the middle, it presents a sort of swelling within, 
which is a strong valvule, and from it proceeds a very long 
ccecum, as in the decapods. Sometimes, as in the entomo- 
straca, there is no trace of these parts. Finally, its termina- 
tion is always situated on the lower face of the last segment 
of the tail or abdomen. 
The liver in the crabs, astaci, and other decapod Crustacea, 
is a very voluminous organ, especially at certain periods of the 
year. It is situated at the lower face of the body, that is to 
say, underneath the stomach, heart, and preparatory organs of 
generation 5 and in the paguri it fills up moie than the entire 
base of the tail. Its general form is indeterminate, for it is not 
comprised in a proper membranaceous envelope, such as the 
conglomerate glands of vertebrated animals possess. It is 
composed of an innumerable multitude of small secretory sacs, 
intermingled together, of a yellow colour, whose parietes ap- 
pear spongy, and which contain a brown and bitter humour, 
which is the bile. Their communication with the intestinal 
canal by hepatic ducts has not been yet. pointed out ; but 
there is reason to believe that it exists not far from the sto- 
mach, if it be not in the stomach itself. 
In the Squill®, the liver, solid, and very similar to a con- 
glomerate gland, is divided into lobes, and these lobes aie 
ranged on the two sides of the whole length of the intestinal 
canal. In the limulae, the liver pours the bile into the intes- 
tine, through two canals on each side. In oniscus we merely 
remark, close by the oesophagus, four voluminous and blind 
