146 MR. P. CHALMERS MITCHELL ON THE [Jan. 14, 
immature Gallinaceous bird. I reproduce here a cut from my 
paper on Chauna (fig. 10). The duodenum is a distinct fold, and 
the duodenal vein receives short-circuiting branches from the 
Fig. 10. 
Intestine of Chauna chavaria. 
s. Proventriculus with g the glandular patch. 
d. Duodenum enclosing the pancreas (the duodenum has been turned for- 
ward). 
Z to l. The large loop of the intestine, with y the yolk-sac diverticulum about 
the middie of its length. This coil has also been raised up and turned 
forward. The remains of the ventral mesentery running from the 
diverticulum are not shown, as they lie under the intestinal loop. 
ec. The cexea. 7. Large intestine. 
7.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 
cea, 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 ceca, 
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 
Mi a" * 
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