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How are the Cretaceous Ichthyosauria, Plesiosauria, or Pterosauria less embryonic, or more differentiated, species than those of the Lias? Or lastly, in what circumstance is the 'Phascolotherium' more embryonic, or of a more generalized type, than the modern Opossum; or a 'Lophiodon', or a 'Paleotherium', than a modern 'Tapirus' or 'Hyrax'?

In 1800 he finds a few teeth, in following years a few bones; and after many years' patience and skill he ascertains and demonstrates the existence and place of a number of tapir-like animals which he classed as Lophiodon Paleotherium and Anoplotherium, formerly abounding on the banks of the ponds which have left their mud and marl in the tertiary strata of the Paris basin.

Flocks of mammoths browsed on the plains where, since, the Atlantic has been; the paleotherium, half horse, half tapir, overturned with his tumbling the ant-hills of Montmartre; and the cervus giganteus trembled under the chestnut trees at the growls of the bears of the caverns, who made the dog of Beaugency, three times as big as a wolf, yelp in his den.

How are the Cretaceous Ichthyosauria, Plesiosauria, or Pterosauria less embryonic, or more differentiated, species than those of the Lias? Or lastly, in what circumstance is the 'Phascolotherium' more embryonic, or of a more generalized type, than the modern Opossum; or a 'Lophiodon', or a 'Paleotherium', than a modern 'Tapirus' or 'Hyrax'?