126 
Mr. Gibson’s Description of an 
and descending aorta, and underneath the apex of each heart, 
and the large vessels, which entered the right heart from the 
liver. In this cavity, which may be considered as a second 
abdomen, were deposited, a spleen, pancreas, omentum, and 
stomach, connected with the oesophagus of the right head. It 
communicated with the usual cavity of the abdomen, by an 
opening similar to the foramen of Winslow; for a probe, 
introduced underneath the vessels of the liver, passed 
into it. 
Little irregularity was observable in the viscera of the ab- 
domen. A second stomach occupied nearly its usual situation. 
With this the duodenum was connected in the common way ; 
and at a short distance from the pylorus, was joined by the 
duodedum from the stomach placed in the cavity of the chest. 
Close to this junction, the ductus communis choledochus, and 
ductus pancreaticus, entered the intestine. The only circum- 
stance of irregularity in the other intestine was, that the 
coecum and that part of the colon, which is, generally, closely 
bound down by the peritoneum to the right side, was attached 
to it by a membrane of considerable length, which allowed 
them to be turned to the right or left side indifferently. All 
the intestines, however, were more capacious than natural. 
As I anticipated some remarkable deviations from nature 
in the formation and arrangement of the vascular system, I 
carefully injected the body by the umbilical vein. On inspect- 
ing the chest, I found two hearts, formed of the usual 
number of auricles and ventricles, and inclosed in separate 
pericardia. The heart situated towards the left side, and cor- 
responding to the male head, was considerably the largest. 
From its ventricles the aorta and pulmonary artery arose in 
