ARTIODACTYLA (Gr. _artios_, even; _daktulos_, a finger or toe).
A division of the hoofed quadrupeds (_Ungulata_) in which each
foot has an even number of toes (two or four).
ASAPHUS (Gr. _Asaphes_, obscure). A genus of Trilobites.
ASCOCERAS (Gr. _askos_, a leather bottle; _keras_, horn). A genus
of Tetrabranchiate Cephalopods.
ASIPHONATE. Not possessing a respiratory tube or siphon. (Applied
to a division of the _Lamellibranchiate_ Molluscs.)
ASTEROID (Gr. _aster_, a star; and _eidos_, form). Star-shaped,
or possessing radiating lobes or rays like a star-fish.
ASTEROIDEA. An order of _Echinodermata_, comprising the Star-fishes,
characterised by their rayed form.
ASTEROPHYLLITES (Gr. _aster_, a star; _phullon_, leaf). A genus
of Palaeozoic plants, with leaves in whorls.
ASTRAEIDAE (Gr. _Astroea_, a proper name). The family of the
Star-corals.
ASTYLOSPONGIA (Gr. _a_, without; _stulos_, a column; _spoggos_,
a sponge). A genus of Silurian Sponges.
ATHYRIS (Gr. _a_, without; _thura_, door). A genus of Brachiopods.
ATRYPA (Gr. _a_, without; _trupa_, a hole). A genus of Brachiopods.
AVES (Lat. _avis_, a bird). The class of the Birds.
AVICULA (Lat. a little bird). The genus of Bivalve Molluscs
comprising the Pearl-oysters.
AXOPHYLLUM (Gr. _axon_, a pivot; _phullon_, a leaf). A genus of
Rugose Corals.
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