Dragons of the Air

An Account of Extinct Flying Reptiles

Author: H.G. Seeley
Published: 1901
Language: English
Wordcount: 57,752 / 187 pg
Flesch-Kincaid Reading Ease: 57
LoC Category: QE
Downloads: 976
Added to site: 2011.08.04
mnybks.net#: 30551
Genre: Science
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Excerpt

condition is not usual in amphibians or fishes. When hatched the young reptile is completely formed, the image of its parent, and has no need to grow a covering to its skin like some birds, or shed its tail like some tadpoles. The reptile is like the bird in freedom from important changes of form after the egg is hatched; and the only structure shed by both is the little horn upon the nose, with which the embryo breaks the shell and emerges a reptile or a bird, growing to maturity with small subsequent variations in the proportions of the body.

[Illustration: FIG. 1 LUNG OF THE FISH CERATODUS

Partly laid open to show its chambered structure (After Guenther)]

THE REPTILE SKIN

Between one class of animals and another the differences in the condition of the skin are more or less distinctive. In a few amphibians there are some bones in the skin on the under side of the body, though the skin is usually naked, and in frogs is said to transmit air to the blood, so as to exercise a respira

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