. The protected egg which presumably gave the early reptiles their initial advantage over the amphibians. Here for the first time the de- veloping embryo is freed from its prior bond- age to the water, by means of a hard, protec- tive shell and an enveloping sac (the amnion) —hence the name, amniote egg From Romer's Alan and the Vertebrates, The University of Chicago Press 47 J

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Keywords: ., bookcentury1900, bookpublishernewyork, booksubjectreptilesfossil