542 APPENDIX. 



reckoned an eighth stomach; but as the gall- 

 ducts enter it, I shall call it duodenum. 



The inner coat of the jejunum and ilium appears 

 in irregular folds, which may vary according as 

 the muscular coat of the intestine acts : yet I do 

 not believe that their form depends entirely on 

 that circumstance, as they run longitudinally, and 

 take a serpentine course when the gut is shortened 

 by the contraction of the longitudinal muscular 

 fibres. The intestinal canal of the Porpoise has 

 several longitudinal folds of the inner coat pass- 

 ing along it, through the whole of its length. In 

 the Bottle-nose the inner coat, through nearly the 

 whole track of the intestine, is thrown into large 

 cells, and these again subdivided into smaller, the 

 axis of which cells is not perpendicular to a trans- 

 verse section of the intestine, but oblique, forming 

 pouches with mouths downwards, and acting al- 

 most like valves, when any thing is attempted to 

 lie passed in a contrary direction : they begin 

 faintly in the duodenum, before it makes its quick 

 turn, and terminates near the vent. The colon 

 and rectum have the rugae very flat, which seems 

 to depend entirely on the contraction of the gut. 

 The rectum, near the vent, appears, for four or 

 five inches, much contracted, is glandular, co- 

 vered by a soft cuticle, and the vent is small. 



I never found any air in the intestines of this 

 tribe, nor indeed in any of the aquatic animals. 



The mesentcric artery anastomoses by large 

 branch 



