STUDIFJS IN THE PERITONEUM. 
541 
. he relation of the transverse colon and great omentum dif- 
ers in that its relation to the left side does not produce a lig- 
mentum phrenico-colicum as in man. In no rodent did I 
und residual peritonitis as I have in man and solipeds. 
Fig. i. This sketch I drew from nature, the subject being 
■ gray tree-squirrel (rodentia). It represents the long, free 
luodenum (3, 4, 5 and 6), and the descending colon as it 
>asses in front of the left blade of the meso-duodenum. 1, 
tomach; 2, pylorus; 3, 4, 5 and 6, duodenum; 7,8 and 9 
hows the ascending meso-colon dragged up from the left 
>lade of the meso-duodenum. 10 and 11 point to the arteries 
(f the two loops of the ascending colon which are put on a 
tretch by the two hooks at the top of the loops. 26 marks 
he ascending colon just before it widens into the caecum. 13 
hows the straight rectum with its meso-rectum inserted in 
he middle line. 14, 15 and 16 mark the left blade of the ex- 
ensive meso-duodenum, over which the ascending colon is 
rrregularly spread with its two loops. The loops in the living 
.nimal lie parallel to the body, with their tips posterior. 17 
5 a significant mark, as it shows the right beginning relations 
>f the great omentum with the transverse colon joint. It is 
he standard which I have chosen in man as the upper end of 
he ascending colon. It will be either the right edge of the 
igamentum hepato-duodenale, or the right edge of the liga- 
nentum hepato-colicum. I did not sketch it as extending far 
enough to the right, because I wished to represent the meso- 
luodenum. 12 is the upper right border of the ligamentum 
lepata-duodenale, or the ligamentum hepato-colicum, and 17 
5 the right portion of the ligamentum gastro-colicum, or the 
;reat omentum. 18 and 24 represent the descending meso- 
; olon inserted directly in the middle line. The left kidney 
loes not disturb it as in man, nor steal a part of it to cover 
ts surface as in bimana. 19 points to the lower end of the 
luodenum, or the beginning of the jejunum. 20 is the ilium 
I ntering the ascending colon. 21, 22 and 23 are the caecum. 
There is no appendix in a squirrel. (The only animals 
>ossessing an appendix are the wombat, man and the higher 
pes). Observe the peculiar fold at 25, which is found with 
