MOLLUSCOIDA (_Mollusca_; Gr. _eidos_, form). The lower division
of the _Mollusca_, comprising the _Polyzoa, Tunicata_, and
_Brachiopoda_.
MONOGRAPTUS (Gr. _monos_, single; _grapho_, I write). A genus
of Graptolites.
MYLODON (Gr. _mulos_, a mill; _odous_, tooth). An extinct genus
of Edentate Mammals.
MYRIAPODA or MYRIOPODA (Gr. _murios_, ten thousand; _podes_,
feet). A class of _Arthropoda_ comprising the Centipedes and their
allies, characterised by their numerous feet.
NATATORES (Lat. _nare_, to swim). The order of the Swimming Birds.
NATATORY (Lat. _nare_, to swim). Formed for swimming.
NAUTILOID. Resembling the shell of the _Nautilus_ in shape.
NERVURES (Lat. _nervus_, a sinew). The ribs which support the
membranous wings of insects.
NEUROPTERA (Gr. _neuron_, a nerve; _pteron_, a wing). An order
of Insects characterised by four membranous wings with numerous
reticulated nervures (_e.g._, Dragon-flies).
NEUROPTERIS (Gr. _neuron_, a nerve; _pteris_, a fern). An extinct
genus of Ferns.
NOTHOSAURUS (Gr. _nothos_, spurious; _saura_, lizard). A genus
of _Plesiosaurian_ Reptiles.
NOTOCHORD (Gr. _notos_, back; _chorde_, string). A cellular rod
which is developed in the embryo of Vertebrates immediately beneath
the spinal cord, and which is usually replaced in the adult by the
vertebral column.
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