. The chordates. Chordata. Fig. 59. Stages in the development of lungs in vertebrates. (A) A frontal section of a salamander embryo showing the series of paired pouches which form the gill- slits. (After Goette.) The last pair of pharyngeal pouches develop into the lungs. Such evidence suggests that lungs may have arisen in phylogenesis from a pair of gill-pouches which failed to reach the surface. (B, C) Earlier and later stages in the development of the lungs in an amphibian. (D) A cross section of the early embryonic lung-sac in a reptile. (After Wiedersheim.) (Bedravvn from lhle. Cour- tes
. The chordates. Chordata. Fig. 59. Stages in the development of lungs in vertebrates. (A) A frontal section of a salamander embryo showing the series of paired pouches which form the gill- slits. (After Goette.) The last pair of pharyngeal pouches develop into the lungs. Such evidence suggests that lungs may have arisen in phylogenesis from a pair of gill-pouches which failed to reach the surface. (B, C) Earlier and later stages in the development of the lungs in an amphibian. (D) A cross section of the early embryonic lung-sac in a reptile. (After Wiedersheim.) (Bedravvn from lhle. Cour- tesy, Neal and Band: "Chordate Anatomy," Philadelphia, The Blakiston Company.). 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 Rand, Herbert W. (Herbert Wilbur), 1872-1960. Philadelphia : Blakiston
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