. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates -- Anatomy. RESPIRATORY ORGANS. 243 thelium. Three pairs of these usually arise, before the gill clefts break through, on the outer surface of the third, fourth and fifth arches, and they are supplied by the corresponding (aortic) arches of the blood system. They are without any skeletal support and are of varying form, -pectinate, bipinnate, dendritic, etc. (fig. 250)—and in one species. FIG. 250.—-External gills of young Amphiuma, partially covered by opercular fold. of csecilians, where but a single pair occurs, they ar
. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates -- Anatomy. RESPIRATORY ORGANS. 243 thelium. Three pairs of these usually arise, before the gill clefts break through, on the outer surface of the third, fourth and fifth arches, and they are supplied by the corresponding (aortic) arches of the blood system. They are without any skeletal support and are of varying form, -pectinate, bipinnate, dendritic, etc. (fig. 250)—and in one species. FIG. 250.—-External gills of young Amphiuma, partially covered by opercular fold. of csecilians, where but a single pair occurs, they are large leaf-like lobes. When the gill clefts break through there is an ingrowth of ecto- derm into each cleft, from which (except in perennibranchs) gill fila- ments are developed on the sides of the septa, so that for a time there may be both external and internal gills (fig. 251, right side). In the. 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. Philadelphia, P. Blakiston's son & co.
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