I. Placentalia. This subclass embraces all the higher orders, including
man. In these the fetus is attached to the uterus by a placenta.
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.] The
science which relates to mammals or the Mammalia. See Mammalia.
Mam"ma*ry (?), a. [Cf. F. mammaire.] (Anat.) Of or pertaining to the
mammæ or breasts; as, the mammary arteries and veins.
Mam*mee" (?), n. [Haytian mamey.] (Bot.) A fruit tree of tropical
America, belonging to the genus Mammea (M. Americana); also, its fruit.
The latter is large, covered with a thick, tough ring, and contains a
bright yellow pulp of a pleasant taste and fragrant scent. It is often
called mammee apple.
Mam"mer (?), v. i. [Cf. G. memme coward, poltroon.] To hesitate; to
mutter doubtfully. [Obs.]
Mam"met (?), n. [See Mawmet.] An idol; a puppet; a doll. [Obs.] Selden.
Shak.