Definitions
from The Century Dictionary.
- In Owen's classification, the lowest of four subclasses of Mammalia, including the marsupials and monotremes, or Didelphia and Ornithodelphia; the implacental mammals.
from the GNU version of the Collaborative International Dictionary of English.
- noun plural (Zoöl.) A group of Mammalia, including the marsupials and monotremes; -- so called because the corpus callosum is rudimentary.
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