. Text book of vertebrate zoology. Vertebrates; Anatomy, Comparative. ORGANS OF CIRCULATIOiV. 187 portion of the arch and the pulmonary artery increase in size, while that portion of the arch between the pulmonary artery and the radix remains undeveloped (ductus Botalii) or becomes entirely aborted. In the amphibia also the radix disappears be- tween the first and third arches, so that blood forced through the anterior arches can only go to the head through the Fig. 200. Diagrams of the aortic arches in different groups of vertebrates. A, fishes; B, amphibia; C, reptiles; D, birds;
. Text book of vertebrate zoology. Vertebrates; Anatomy, Comparative. ORGANS OF CIRCULATIOiV. 187 portion of the arch and the pulmonary artery increase in size, while that portion of the arch between the pulmonary artery and the radix remains undeveloped (ductus Botalii) or becomes entirely aborted. In the amphibia also the radix disappears be- tween the first and third arches, so that blood forced through the anterior arches can only go to the head through the Fig. 200. Diagrams of the aortic arches in different groups of vertebrates. A, fishes; B, amphibia; C, reptiles; D, birds; E, mammals; a, ventral aorta; c, internal carotids; e, external carotids; p, pulmonary arteries; s, subclavian arteries. After Lambert. In the urodeles two arches on either side (three and four) con- nect with the dorsal aorta by means of the radices ; but in the anura, on the assumption of the adult condition, the fourth arch degenerates. In the reptiles the conditions are somewhat complex. In certain lizards the third arch as well as the fourth may be con-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Kingsley, J. S. (John Sterling), 1854-1929. New York, H. Holt and Company
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