146 



ME. P. CHALMERS MITOUELL ON TUB 



[Jan. 14, 



immature Gallinaceous bird. I reproduce here a cut from my 

 paper on Chaiina (fig. 10). Tlie duodenum is a distinct fold, and 

 the duodenal vein receives short-circuitino; brandies from the 



Intestine of Chauna chavaria. 



s. Proventriculus witli g the glandular patch. 



d. Duodenum enclosing the pancreas (the duodenum has been turned for- 

 ward). 



I to I. The large loop of the intestine, with y the yolk-sac diverticulum about 

 the middle of its length. This coil has also been raised up and turned 

 forward. The remains of the venti-al mesentery running from the 

 diverticulum are not shown, ne they lie under the intestinal loop. 



c. The coBCa. l.i. Large intestine. 



r.v. Rectal mesenteric vein. This dips under the mesentery of the large loop, 

 where its course is shown by a dotted line. It there joins with the large 

 central vein of the large loop and with the veins from the duodenum and 

 caeca, and the blood passes forward, its course being shown by a dotted 

 line, to the portal vein p.v. 



hinder region of the circular fold, especially from one of the caeca, 

 which, in the diagram, is represented as turned outwards. The 

 circular loop differs in no essential respect from the primitive 

 avian type, as displayed in the Ostrich and young Argus. The 



