ES (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_.

ANNULARIA (Lat. _annulus_, a ring). A genus of Palaeozoic plants,
with leaves in whorls.

ANNULOSA (Lat. _annulus_). The sub-kingdom comprising the
_Anarthropoda_ and the _Arthropoda_ or _Articulata_, in all of
which the body is more or less evidently composed of a succession
of rings.

ANOMODONTIA (Gr. _anomos_, irregular; _odous_, tooth). An extinct
order of Reptiles, often called _Dicynodontia_.

ANOMURA (Gr. _anomos_, irregular; _oura_, tail). A tribe of Decapod
_Crustacea_, of which the Hermit-crab is the type.

ANOPLOTHERIDAE (Gr. _anoplos_, unarmed; _ther_, beast). A family
of Tertiary Ungulates.

ANOURA (Gr. _a_, without; _oura_, tail). The order of _Amphibia_
comprising the Frogs and Toads, in which the adult is destitute
of a tail. Often, called _Batrachia_.

ANTENNAE (Lat. _antenna_, a yard-arm). The jointed horns or feelers
possessed by the majority of the _Articulata_.

ANTENNULES (dim. of _Antennoe_). Applied to the smaller pair of
antennae in the _Crustacea_.

ANTHRACOSAURUS (Gr. _anthrax_, coal; _saura_, lizard). A genus
of Labyrinthodont Amphibians.

ANTHRAPALAEMON (Gr. _anthrax_, coal; _paloemon_, a prawn--originally
a proper nam