ANATOMY OF THE SHOE-BILTj. 



657 



Just behind the distal extremity of these kinks, the mesentery 

 narrows so as to bring the distal end of Meckel's tract very 

 close to the proximal end of the duodenum. This almost circular 



Text-fig. 122. 



Intestinal Tract of Balceniceps. 



S. Stomach. 

 P. Pyloric chamber. 

 D. Duodenal loop. 

 1, 2, 3. The three loops of Meckel's tract anterior to the diverticulum, 

 tj'pical of the Pelargo-Colymbomorphine Brigade. 

 m, Meckel's Diverticulum. 

 S.D.F. Supra-duodenal loop. 



X, X. Cut ends of bridging vessels from duodenal loop to supra- 

 duodenal loop. 

 K1,K2. Supra-caecal kinks. 

 Ca. Caecum. 



expanse of mesentery grows from the simple primitive loop of 

 which the main branch of the portal vein is the axis and which 



