AMPHICYON (Gr. _amphi_, both--implying doubt; _kuon_, dog). An
extinct genus of _Carnivora_.
AMPHILESTES (Gr. _amphi_, both; _lestes_, a thief). A genus of
Jurassic Mammals.
AMPHISPONGIA (Gr. _amphi_, both; _spoggos_, sponge). A genus of
Silurian sponges.
AMPHISTEGINA (Gr. _amphi_, both; _stege_, roof). A genus of
_Foraminifera_.
AMPHITHERIUM (Gr. _amphi_, both; _therion_, beast). A genus of
Jurassic Mammals.
AMPHITRAGULUS (Gr. _amphi_, both; dim. of _tragos_, goat). An
extinct genus related to the living Musk-deer.
AMPLEXUS (Lat. an Ambrace). A genus of Rugose Corals.
AMPYX (Gr. _ampux_, a wreath or wheel). A genus of Trilobites.
ANARTHROPODA (Gr. _a_, without; _arthros_, a joint; _pous_, foot).
That division of _Annulose_ animals in which there are no articulated
appendages.
ANCHITHERIUM (Gr. _agchi_, near; _therion_, beast). An extinct
genus of Mammals.
ANCYLOCERAS (Gr. _agkulos_, crooked; _ceras_, horn). A genus of
_Ammonitidoe_.
ANCYLOTHERIUM (Gr. _agkulos_, crooked; _therion_, beast). An extinct
genus of Edentate Mammals.
ANDRIAS (Gr. _andrias_, image of man). An extinct genus of tailed
Amphibians.
ANGIOSPERMS (Gr. _angeion_, a vessel; _sperma_, seed). Plants
which have their seeds enclosed in a seed-vessel.
ANNELIDA (a Gallicised form of _Annulata_). The Ringed Worms,
which form one of the divisions of the _Anarthropoda_.
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