LEPIDOSIREN (Gr. _lepis_, a scale; _seiren_, a siren--the generic
name of the Mud-eel or _Siren lacertina_). A genus of Dipnoous
fishes, comprising the "Mud-fishes."
LEPIDOSTROBUS (Gr. _lepis_, a scale; _strobilos_, a fir-cone).
A genus founded on the cones of _Lepidodendron_.
LEPTAENA (Gr. _leptos_. slender). A genus of Brachiopods.
LINGULA (Lat. _lingula_, a little tongue). A genus of Brachiopods.
LYCOPODIACEAE (Gr. _lupos_, a wolf; _pous_, foot). The group of
Cryptogamic plants generally known as "Club-mosses."
MACHAERACANTHUS (Gr. _machaira_, a sabre; _acantha_, thorn or spine).
An extinct genus of Fishes.
MACHAIRODUS (Gr. _machaira_, a sabre; _odous_, tooth). An extinct
genus of Carnivora.
MACROTHERIUM (Gr. _makros_, long; _therion_. beast). An extinct
genus of Edentata.
MACRURA (Gr. _makros_, long; _oura_, tail). A tribe of Decapod
_Crustaceans_ with long tails (e.g., the Lobster, Shrimp, &c.)
MAMMALIA (Lat. _mamma_, the breast). The class of Vertebrate animals
which suckle their young.
MANDIBLE (Lat. _mandibulum_, a jaw). The upper pair of jaws in
Insects; also applied to one of the pairs of jaws in _Crustacea_
and Spiders, to the beak of Cephalopods, the lower jaw of
Vertebrates, &c.
MANTLE. The external integument of most of the Mollusca, which
is largely developed, and forms a cloak in which the viscera
are protected.
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