Abstract
IT is a fact well known to palaeontologists that many widely separated groups of the animal kingdom have, during the course of their evolution, and especially towards the end of that course, shown a strongly marked tendency to enormous increase in size.z We see this in the extinct eurypterids, giants amongst the arthropoda, in the huge labyrinthodont amphibians, in many reptiles of the Secondary period, some of which attained a length of 180 feet or more, and amongst mammals in the extinct Tinoceras and the still surviving elephants and whales.
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Momentum in Evolution 1 . Nature 88, 301–302 (1911). https://doi.org/10.1038/088301a0
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DOI: https://doi.org/10.1038/088301a0