. The biology of the amphibia. Amphibians. THE RESPIRATORY SYSTEM 161 was an inheritance from the larvae and not from the adults of their piscine ancestors. Relation of Gill Form to Function.—The fully developed form of the external gills of the various species of Amphibia is closely correlated with the functional needs of the larvae. This was shown in the discussion of their life history. The reduction of. C Fig. 61.—Head and gill form in Pseudobranchus striatus (A) and Siren lacertina (B), drawn from living specimens approximately six inches in total length. Young Siren lacertina (C) after t
. The biology of the amphibia. Amphibians. THE RESPIRATORY SYSTEM 161 was an inheritance from the larvae and not from the adults of their piscine ancestors. Relation of Gill Form to Function.—The fully developed form of the external gills of the various species of Amphibia is closely correlated with the functional needs of the larvae. This was shown in the discussion of their life history. The reduction of. C Fig. 61.—Head and gill form in Pseudobranchus striatus (A) and Siren lacertina (B), drawn from living specimens approximately six inches in total length. Young Siren lacertina (C) after treatment with 1 to 1,000 solution of iodothyrine. The branchiae are entirely lost, although their position is indicated by a densely pigmented swelling. Drawn from a formalin-fixed specimen, the lateral-line organs obscure, not indicated. the gill clefts may also have a functional significance. For exam- ple, Siren, with four branchial arches, has the first three clefts open in the mature animal, while the closely related Pseudo- branchus, which unlike Siren is a burrowing salamander, has the same number of arches, but only the second cleft remains open. 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 Noble, Gladwyn Kingsley, 1894-1940. New York : McGraw-Hill
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Keywords: ., bookcentury1900, bookpublishernewyorkmcgr, booksubjectamphibians
