The Transformations of the Animal World

Cover The Transformations of the Animal World
The Transformations of the Animal World
Charles Jean Julien Depret
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The dental plates, almost identical, which we find in the Coal of England, which have received the name of Ctenodus, measure as much as six centimetres ; the first correspond to a fish of fifty centimetres at most, the second to an animal exceeding a total length of 1. 50m.
The Palaeozoic Amphibians designated by the general name of Stegocephala, by reason of the bony dermic plates which form a perfect cephalic shield, lived from the Carboniferous to the end of the Trias. The group as a whole p
...resents a most regular progression in size, commencing with the small forms of the lower Carboniferous up to the gigantic types of the upper Trias of Suabia. But we are -here dealing with a very abundant group, evi- dently composed of a great number of parallel branches. If we confine ourselves to the single sub- order of the Labyrinthodons, of which the conical teeth are ornamented with deep and meandriform furrows, we may note in the Coal of England the genera Loxomma and Anthracosaurus, of which the skull already attains from thirty to thirty-five centimetres in length, which we may say in passing LAW OF SIZE IN THE PHYLETIC BRANCHES 199 allows us to predict the future discovery of smaller ancestors in the Devonian and in the Silurian.

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