PAPIO PORCARIUS. 17 



[The Pig-paced Baboon {Papio porcarius, Kuhl).] Mr. Gough's 

 Monkey, of which I have a painting 1 . 



The duodenum passed to the right as in the human, then downwards, 

 sinking behind the beginning of the transverse arch of the colon to 

 which it adhered, then emerging below the posterior surface of the root 

 of the mesentery to which it is attached as it is turning to the left ; it 

 then gets upon the left edge of the mesentery, and becomes a loose intes- 

 tine, forming the jejunum and ilium, which were without valvules 

 conniventes. 



These small intestines gradually pass from the left above to the right 

 downward in various convolutions, and their termination, or ilium, 

 enters the caecum just before the right psoas muscle. Between the ilium 

 and the caecum there is a mesentery of the whole length of the caecum, 

 which is just opposite the common mesentery. 



The caecum was loose, unattached, excepting by the mesentery, which 

 was the right edge of the common mesentery. 



The colon at its beginning is loose also, except where it is attached 

 to the same mesentery. At the upper part of the colon, just before it 

 crosses the abdomen, it is attached to the loins, duodenum, &c, then, 

 crossing the body, it becomes a very loose intestine, having a very 

 broad mesocolon. This transverse arch of the colon is of considerable 

 length, and is therefore thrown into a number of convolutions. When 

 got to the left side it passes down unattached to anything but its meso- 

 colon, which is becoming narrower and narrower as it approaches the 

 rectum, which is at last attached to the sacrum by a broad surface, and 

 as it passes over the left psoas muscle it is thrown into larger convolu- 

 tions : it has three longitudinal bands, as in the human subject, but not 

 so broad. 



The epiploon is attached anteriorly to the great curvature of the 

 stomach, but not to the left or great end ; it is connected on the right 

 to the pylorus and duodenum, and to the beginning of the transverse 

 arch of the colon. Then it seems to bend round to form the posterior 

 part, for posteriorly it is attached to a little part of the beginning of 

 the transverse arch of the colon below the above ; then to the root of 

 the mesocolon and lower edge of the pancreas on the left to the 

 spleen. It is a broad flat membrane, making one large pouch, covering 

 the whole intestines, having its loose edges tucked in behind them all 

 round the fat accompanying the vessels, and of course it is very thin 

 between. 



1 [This painting is preserved in the Royal College of Surgeons, London.] 

 VOL. II. C 



