"The jaws of the Plesiosaurs were armed with large numbers of sharp teeth, which it sank into the body of its prey. (Above; head of the genus Muraenosaurus, a plesiosaur over 20 feet long. Centre; head of the genus Hydrotherosaurus, a plesiosaur over 40 feet long. Below; head of the genus Styxosaurus."
Prehistoric Sea Monsters. Written by Dr. Josef Augusta. Illustrated by Zdeněk Burian. 1966.
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