StruS&ure and Occonomy of Whales. 409 
The fifth ftomach is in the Piked Whale round, and in the 
Porpoife oval ; it is fmall, and terminates in the pylorus, which 
has little of a valvular appearance. Its coats are thinner than 
thofe of the fourth, having an even inner furface, which is 
commonly tinged with bile. 
The Piked Whale and, I believe, the large Whalebone 
Whale, have a caecum ; but it is wanting in the Porpoife, 
Grampus, and Bottle-nofe Whale. 
The ftruCture of the inner furface of the intefline is in fome 
very lingular, and different from that of the others. 
The inner furface of the duodenum in the Piked Whale is 
thrown into longitudinal rugae, or valves, which are at fome 
diftance from each other, and thefe receive lateral folds. The 
duodenum in the Bottle-nofe fwells out into a large cavity, and 
might almoft be reckoned an eighth ftomach ; but as the gall 
duCts enter it I fhall call it duodenum. 
The inner coat of the jejunum, and ilium, appears in irre- 
gular folds, which may vary according as the mufcular coat of 
the intefline aCts : yet I do not believe, that their form de- 
pends intirely on that circumftance, as they run longitudinally, 
and take a ferpentine courfe when the gut is fhortened by the 
contraction of the longitudinal mufcular fibres. The inteftinal 
canal of the Porpoife has feveral longitudinal folds of the inner 
coat palling along it, through the whole of its length. In the 
Bottle-nofe the inner coat, through nearly the whole track of the 
intefline, is thrown into large cells, and theie again lubdivided 
into fmaller; the axis of which cells is not perpendicular to a 
trail fve rfe lection of the intefline, but oblique, forming pouches 
with the mouths downwards, and acting almoft like valves, 
when any thing is attempted to be palled in a contrary di- 
rection : they begin faintly in die duodenum, before it makes 
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