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AMPHITHERIUM (Gr. _amphi_, both; _therion_, beast). A genus of Jura.s.sic 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 dest.i.tute 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 name). A genus of long-tailed Crustaceans from the Coal-measures.
ANTLERS. Properly the branches of the horns of the Deer tribe (_Cervidoe_), but generally applied to the entire horns.
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 cla.s.s 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 const.i.tutes 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.
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 cla.s.s 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.
