INTESTINAL TKACT OF BIEDS. 

 Fig. 3. 



183 



Intestinal Tract of Rhea americina. 



x, x', cut ends of " bridging " factors of duodenal vein, draining the distal portion of MeckePs tract and one 

 caecum ; z, factor of the spleuic vein. General description as in legend of figure 1. 



Fig. 4. 



x> 



Intestinal Tract of Apteryx Mantelti. 

 For explanation, see legends of figs. 1 and 3. S.D.F., apex of supra-duodenal loop. 



29* 



