. The American journal of anatomy. e anasto-mosis about midway betweenthe A. omphalomesentericaand the A. iliaca, which re- ininrlc nno Iorv iTmr-li r,f +ViD FiG. 6. Reconstruction Of the veiious System of ammciS one \ery mucn 01 tne chick of 5 days. Ventralview. X3V. (ExplanalionState of affairs in Echidna, of lettering on page 2Si.) though the fusion takes place to a less degree than in the latter. Hav-ing found only this one example in all the specimens examined it wouldbe going too far to assert that the above conditions in the chick aremore than accidental, despite the fact that they exhi
. The American journal of anatomy. e anasto-mosis about midway betweenthe A. omphalomesentericaand the A. iliaca, which re- ininrlc nno Iorv iTmr-li r,f +ViD FiG. 6. Reconstruction Of the veiious System of ammciS one \ery mucn 01 tne chick of 5 days. Ventralview. X3V. (ExplanalionState of affairs in Echidna, of lettering on page 2Si.) though the fusion takes place to a less degree than in the latter. Hav-ing found only this one example in all the specimens examined it wouldbe going too far to assert that the above conditions in the chick aremore than accidental, despite the fact that they exhibit such a strikingresemblance to reptiles and Echidna. After the 5th day of incubation the subcardinals begin to decrease inimportance, for with the gradual atrophy of the mesonephroi they haveless and less of the function of efferent vessels to perform. The por-tion of each vessel caudal to the anastomosis becomes shorter; the ante-rior end of the left vein diminishes while the corresponding part of theright disappears 292 The Development of the Postcaval Vein in Birds During the process of development tlie right lobe of the liver enlargesand grows backward, and thus includes the portion of the postcavawhich was at first situated in the caval mesentery and which is desig-nated in Fig. 7 as pars liepatica (V. c. i. H.). -
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectanatomy, bookyear1901
