OBSERVED IN THE NORTH POLAR SEA. 517 
The bronchial arches are set with soHtary rows of long 
awl-shaped cartilaginous processes, serrated on their inner 
sides with two rows of minute teeth. The central processes 
of the upper arch are half an inch long, those on the other 
arches are smaller. 
The oesophagus is short, and distinguished from the sto- 
mach by its white colour, and glandular appearance. Its 
internal membrane forms six large longitudinal rugsd. The 
stomach descends in a straight line from the oesophagus, for 
about an inch and a half ; it is then bent upon itself, and 
runs upwards towards the septum, and terminates in the 
first intestine. The descending portion of the stomach is 
slender, the ascending part more dilated; both are lined 
by a continuation of the internal membrane of the oesopha- 
gus, and exhibit the same number of rugee. This mem- 
brane is thick, and forms a projecting ring at the pylorus, 
where it evidently terminates. The ascending portion of 
the stomach differs remarkably from the same part in the 
Attihhawmegh, in the comparative thinness of its coats» 
Beyond the pylorus there is a sac of the same diameter 
with the fundus of the stomach, and like it directed up- 
wards. It is lined by a firm, somewhat glandular mem- 
brane, perforated by the orifices of numerous caeca. At 
the bottom of this sac, the alimentary canal is again bent 
upon itself, and runs downwards in a straight line to the 
anus. In the upper part of this course the canal is slender, 
with delicate coats, and no rugae : in the lower part, its 
diameter becomes greater, and its lining is disposed in cir- 
cular plicje, of a bright red colour, similar to the same part 
of the Attihhawmegh. About an inch of intestine next the 
anus is smooth, and somewhat dilated. There is no proper 
valve at the rectum. 
There are about ISO caeca inserted into the sac above 
mentioned, and into the gut a short vmy below it= The 
