46- ANATOMY OP A CHELONIAN. 



b. The remainder of this division runs on as the 

 communicating artery to join the right aorta. 



105. The middle division is the superior mesenteric; it 

 breaks up in the mesentery (87) to supply most of the 

 gut, and also gives a branch to the spleen. 



106. The third division (the gastro-duodenal artery) di- 

 vides into two main stems, the superior and inferior pan- 

 creatico-duodenal arteries, the former running to the left, 

 and the latter to the right end of the pancreas. Each 

 then courses between duodenum and pancreas to anas- 

 tomose with the other, giving off branches to the gut 

 and gland on the way. 



The superior pancreatico-duodenal ^ives ofE a branch, the 

 left gastro-epiploic artery, which runs along the great cur- 

 vature of the stomach, and inosculates with the right 

 gastro-epiploic. 



107. Now divide the intestine close to the stomach, 

 and again in its rectal portion about two inches in 

 front of the pelvis. Remove the portion of the gut be- 

 tween the two incisions by cutting through the mesen- 

 tery close to it ; while so doing note the large fold, 

 with its concavity to the left, made by the colon as it pro- 

 ceeds from the junction with the small intestine, and 

 before turning directly back to the cloaca as the rectum. 



108. Spread out the removed portion of the gut ; 

 note that the small intestine is from five to six times 

 longer than the carapace, and the large about one-fourth 

 the length of the small. Then open the small intestine 

 along its whole length, and note its thick muscular coat 



