. The chordates. Chordata. 196 Comparative Morphology of Chordates All chelonians, like all other oviparous reptiles, deposit the eggs on land. Sea turtles, whose legs are adapted for swimming and are ineffective for locomotion on land, come ashore and clumsily crawl to a level above high tide, where the eggs are laid in sand. These facts are highly significant. Amphibia, taking the Class as a whole, are verte- brates in which aquatic characteristics predominate—they are fishlike, " ; Many of them in adult life possess such adaptations as make possible for them a terres
. The chordates. Chordata. 196 Comparative Morphology of Chordates All chelonians, like all other oviparous reptiles, deposit the eggs on land. Sea turtles, whose legs are adapted for swimming and are ineffective for locomotion on land, come ashore and clumsily crawl to a level above high tide, where the eggs are laid in sand. These facts are highly significant. Amphibia, taking the Class as a whole, are verte- brates in which aquatic characteristics predominate—they are fishlike, " ; Many of them in adult life possess such adaptations as make possible for them a terrestrial existence of a very limited sort. But (with rare exceptions) they must return to water for reproduction. Reptiles are primarily land animals. In a few of them digits have become webbed or pentadactyl legs have become modified into flippers, adapting the animal for moderately successful aquatic life. But (unless. Fi<;. .'388. (A) Tortoise. (B) Terrapin. (C) Turtle. (A, courtesy, Brehm: Tierleben," Leipzig, Bibliographisches Institut. B, C, courtesy, Deraniyagala: Tetrapod Reptiles of Ceylon," London, Dulau & Co., Ltd.). 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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