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Or lastly, in what circumstance is the Phascolotherium more embryonic, or of a more generalised type, than the modern Opossum; or a Lophiodon, or a Paloeotherium, than a modern Tapirus or Hyrax?
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 Palæotherium, than a modern Tapirus or Hyrax?
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'?
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'?
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