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"Two genera," our scholarly Conseil hastened to say, "that belong to the family Pinnipedia, order Carnivora, group Unguiculata, subclass Monodelphia, class Mammalia, branch Vertebrata." "Very nice, Conseil," I replied, "but these two genera of seals and walruses are each divided into species, and if I'm not mistaken, we now have a chance to actually look at them. Let's."
"No," I told Conseil, "that's no mermaid, it's an unusual creature of which only a few specimens are left in the Red Sea. That's a dugong." "Order Sirenia, group Pisciforma, subclass Monodelphia, class Mammalia, branch Vertebrata," Conseil replied. And when Conseil has spoken, there's nothing else to be said. Meanwhile Ned Land kept staring.
At the epoch of the Trias, therefore, the Marsupialia must have already existed long enough to have become differentiated into carnivorous and herbivorous forms. But the Monotremata are lower forms than the Didelphia which last are intercalary between the Ornithodelphia and the Monodelphia.
At the epoch of the Trias, therefore, the Marsupialia must have, already existed long enough to have become differentiated into carnivorous and herbivorous forms. But the Monotremata are lower forms than the Didelphia, which last are intercalary between the Ornithodelphia and the Monodelphia.
While I was observing this phenomenal creature, two jets of steam and water sprang from its blowholes and rose to an altitude of forty meters, which settled for me its mode of breathing. From this I finally concluded that it belonged to the branch Vertebrata, class Mammalia, subclass Monodelphia, group Pisciforma, order Cetacea, family . . . but here I couldn't make up my mind.
The mode of origin of the Monodelphia from these is a very difficult problem, for the most part left open by Professor Haeckel. As regards the latter question, I have little doubt that the Sirenia connect the Ungulata with the Proboscidea; and none, that the Cetacea are extremely modified Carnivora. The passage between the Seals and the Cetacea by Zeuglodon is complete.
But the three sub-classes differ so widely from each other, not only in the construction of the sexual organs, but in many other respects also, that we may confidently draw up the following important phylogenetic thesis: The Monodelphia or Placentals descend from the Didelphia or Marsupials; and the latter, in turn, are descended from the Monotremes or Ornithodelphia.
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