334 Journal of the Asiatic Society of Bengal. [N.S., XIV, 
much coiled appearance. At about the middle of its entire 
length, the ileum divides into two. This is the first indication 
and then enters the left lateral cavity, or the abdominal cavity 
of the left individual (fig. 4). The ileum in the right individ 
passes into a dilated rectum and the junction between the two 
is marked by a pair of elongated coeca. The ileum in the left 
individual passes with very little change of diameter into the 
rectum. I have not been able to find out the coeca m this 
three compartments are present and the bursa F abricit lies 
dorsal to it. In the central cavity lies the liver divided into tH 
right and left lobes. A fairly big gall bladder and a pose 
spleen are present. A pair of thyroids at the base of the 2 
y. 
Respiratory Organs.—The glottis leads into the laryns, * 
usual. The trachea is situated ventral to the 
of its own side. The lungs occupy the dorsal region 
central body-cavity, close beneath the sternum and the *™ 
cent ribs attached to it. We see, thus, there is only one ge 
of lungs common to both the individuals. gsual 
The Heart and Blood-vessels.—The heart consists of the 
chambers, with this difference, that there is a well deovelone a 
w 
supplied wit i in 80 aor 
pplied with arterial and venous blood. The main 7 left aortie 
arising from the left ventricle, divides into the right ane -yidual 
arches. The right aortic arch supplies the right ing 
and the left aortic arch the left individual, with artet!® “j 
By following the course of one arch, say, the Tg! 
found that the arch gives rise to a single innom! 
This arterv gives rise to a single carotid runnin 
artery: 
nate 4 i 
g along the : 
