| OCR Text |
Show 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 forward). 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 ventral mesentery running from the diverticulum are not shown, as they lie under the intestinal loop. c c. The casca. 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 |
