APIOCRINIDAE (Gr. _apion_, a pear; _krinon_, lily). A family of
Crinoids--the "Pear-encrinites."
APTERYX (Gr. _a_, without; _pterux_, a wing). A wingless bird
of New Zealand, belong to the order _Cursores_.
AQUEOUS (Lat. _aqua_, water). Formed in or by water.
ARACHNIDA (Gr. _arachne_, a spider). A class of the _Articulata_,
comprising Spiders, Scorpions, and allied animals.
ARBORESCENT. Branched like a tree.
ARCHAEOCIDARIS (Gr. _archaios_, ancient; Lat. _cidaris_, a diadem).
A Palaeozoic genus of Sea-urchins, related to the existing _Cidaris_.
ARCHAEOCYATHUS (Gr. _archaios_, ancient; _kuathos_, cup). A genus
of Palaeozoic fossils allied to the Sponges.
ARCHAEOPTERYX (Gr. _archaios_, ancient; _pterux_, a wing). The
singular fossil bird which alone constitutes the order of the
_Saururoe_.
ARCTOCYON (Gr. _arctos_, bear; _kuon_, dog). An extinct genus
of Carnivora.
ARENACEOUS. Sandy, or composed of grains of sand.
ARENICOLITES (Lat. _arena_, sand; _colo_, I inhabit). A genus
founded on burrows supposed to be formed by worms resembling
the living Lobworms (_Arenicola_).
ARTICULATA (Lat. _articulus_, a joint). A division of the animal
kingdom, comprising Insects, Centipedes, Spiders, and Crustaceans,
characterised by the possession of jointed bodies or jointed
limbs. The term _Arthropoda_ is now more usually employed.
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