• WordNet 3.6
    • n Metatheria pouched animals
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Century Dictionary and Cyclopedia
    • Metatheria A subclass of Mammalia including the existing Marsupialia and their hypothetical extinct ancestors, as well as other mammals intermediate between marsupials and placental mammals. The marsupials are the only known examples, the term being thus equivalent to Didelphia. It is correlated with Prototheria and Eutheria.
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In literature:

In this group are included not only the Eutheria in the sense of Huxley, but also his Metatheria.
"The Cambridge Natural History, Vol X., Mammalia" by Frank Evers Beddard
Marsupialia (or Metatheria), 161.
"Stories of the Universe: Animal Life" by B. Lindsay