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Sir Everard Home on 
very desirable that the internal cavities of the stomach of that 
animal should be examined and described. This, I believe, 
has never yet been done ; and, whenever an opportunity 
offers of sending the stomach home preserved in spirit the 
opportunity, we trust, will not be lost, as it will prove a most 
acceptable service to Comparative Anatomy. Such an exami- 
nation would probably put us in possession of all the peculi- 
arities in the structure of the organs of digestion, that are 
met with in nature, for digesting vegetable substances, as 
well those that grow upon land, as those that grow at the 
bottom of the sea, or of rivers of fresh water. 
The duodenum receives the ducts of the liver and pancreas 
about four inches from its origin at the pylorus The coats 
are strong, the internal surface is honeycombed, having lon- 
gitudinal ridges, and smaller ones in a transverse direction. 
The jejunum has, on that side attached to the mesentery, a 
row of orifices of glands, not in one line, but in a regular 
zig-zag. These were very distinct in the small dugong, 
but could not be seen in the large one. Similar orifices are 
met with in the colon of the ornithorhyncus paradoxus, 
ranged in ten separate dotted lines. These orifices extend 
to the caecum. The mesenteric glands are large, flat, oval, 
and thinly scattered. 
The caecum is shown in Plate XXVII. ; it is four times the 
size of the ilium, conical in its shape, and thick in its coats. 
The colon has small lacunae over its whole surface. 
The whole intestinal canal is fourteen times the length of 
the animal, of which the small make five, the large nine. 
There are no valvulae conniventes in any part of the in- 
testines. 
