. The structure and classification of birds . rocles. In two species of Bhea the relative positions ofthe pancreatic and bile ducts were as is shown in the the owl Photodilus badius I found that the cystic ductopened near to the summit of the ascending arm of theduodenal loop ; below this opened the hepatic duct, andsome way below this again, and near together, the two pan-creatic ducts. A good many details upon this subject willbe found in Gadows paper on the digestive organs of cloaca of birds is the terminal chamber of thealimentary canal, which also receives the urinar
. The structure and classification of birds . rocles. In two species of Bhea the relative positions ofthe pancreatic and bile ducts were as is shown in the the owl Photodilus badius I found that the cystic ductopened near to the summit of the ascending arm of theduodenal loop ; below this opened the hepatic duct, andsome way below this again, and near together, the two pan-creatic ducts. A good many details upon this subject willbe found in Gadows paper on the digestive organs of cloaca of birds is the terminal chamber of thealimentary canal, which also receives the urinary and genitalducts, and is provided with an appendix of unknown function, ALIMENTARY CANAL 35 the so-called bursa Fabricii. Gadow, in a recent work uponthis region of the alimentary canal, recognises three cham-bers in the cloaca. Above, and separated by a constrictionfrom it, is the coprodeeum, into which the rectum opens;this is divided by a constriction from the middle chamber,or urodseum, which receives the genital and urinary ducts ; b-. Fig. 21.—Cloaca op Chauna derhianu laid open jpkom in fkont. a, rectum; &, orifices of ureters ; &, genital papillse ; c, fold separating coprodasiim fromurodasum ; rf, fold separating urodffium from proctodEeum ; e, opening of /, bursaPabrioii. (After Forbes.) then follows the proctodseum, of which the bursa Fabriciiis a diverticulum. The bursa Fabricii has been chiefly investigated byFoEBES ^ and Wenckebach. It is a dorsal diverticulum ofthe proctodseum, and therefore has nothing to do with the Remarks on tlie Cloaca and on the Copulatory Organs of the Amniota,Phil. Trans, vol. olxxviii. p. 5. 2 On the Bursa Fabricii in Birds, P. Z. 8. 1877, p. 304. De Ontwikkeling en de Bouw der Bursa Fabricii, Inaug. Diss. Leyden1888. See also E. Eettebet, Contribution a IEtude du Cloaque, &c., /. deiAnat. xxi. 1885, p. 369. D 2 86 STKUCTURE AND CLASSIFICATION OF BIRDS ventral bladder of other vertebrates. It is largest in youngbirds, and often becom
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbirds, bookyear1898
