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II. Marsupialia. In these no placenta is formed, and the
young, which are born at an early state of development, are carried
for a time attached to the teats, and usually protected by a
marsupial pouch. The opossum, kangaroo, wombat, and koala are
examples.

III. Monotremata. In this group, which includes the genera
Echidna and Ornithorhynchus, the female lays large eggs
resembling those of a bird or lizard, and the young, which are
hatched like those of birds, are nourished by a watery secretion from
the imperfectly developed mammæ.

Mam*ma"li*an (?), a. Of or
pertaining to the Mammalia or mammals.

Mam`ma*lif"er*ous (?), a.
[Mammal + -ferous.] (Geol.) Containing
mammalian remains; -- said of certain strata.

Mam`ma*log"ic*al (?), a. Of or
pertaining to mammalogy.

Mam*mal"o*gist (?), n. [Cf. F.
mammalogiste.] One versed in mammalogy.

Mam*mal"o*gy (?), n. [Mamma
breast + -logy: cf. f. mammalogie.


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