. The structure and classification of birds . Fig. 10. - Argtis gigantetcs, Chick ; Intestinal Loops(after Chalmers Mitchell). 28 STRUCTURE AND CLASSIFICATION OF BIRDS. Fig. 11.—Casuarius ; Intestinal Tract(aptek Chalmeks Mitchell). the duodenal loop is again the only specialised region of,the intestine. The ostrich and the cassowary present but little modifi-cation of the sameprimitive type of the former we havea rather more com-plicated duodenal loop,which is furnished witha small subsidiary , too, the large in-testine has the sameremarkable folded con-dition seen, but to ale
. The structure and classification of birds . Fig. 10. - Argtis gigantetcs, Chick ; Intestinal Loops(after Chalmers Mitchell). 28 STRUCTURE AND CLASSIFICATION OF BIRDS. Fig. 11.—Casuarius ; Intestinal Tract(aptek Chalmeks Mitchell). the duodenal loop is again the only specialised region of,the intestine. The ostrich and the cassowary present but little modifi-cation of the sameprimitive type of the former we havea rather more com-plicated duodenal loop,which is furnished witha small subsidiary , too, the large in-testine has the sameremarkable folded con-dition seen, but to aless extent, in is simplerthan Struthio. In allthese figures (takenfrom Mr. Mitchellspaper) the course ofthe principal bloodvessels is shown ; onlythe veins, as the arterieswere found invariablyto accompany the will be observed thatthe principal feeder ofthe portal vein runsdirectly across the mainmesenteric fold, andends near to the vitel-line duct, the rudimentof the yolk sac; fromthe junction/of thiswith the main stem ofthe mesenteric vein arise two other vessels; one of these supplies the duodenal loop, the other the large intestine
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbirds, bookyear1898
