A genus of Trilobites.
AEPIORNIS (Gr. _aipus_, huge; _ornis_, bird). A genus of gigantic
Cursorial birds.
AGNOSTUS (Gr. _a_, not; _gignosko_, I know). A genus of Trilobites.
ALCES (Lat. _alces_, elk). The European Elk or Moose.
ALECTO (the proper name of one of the Furies). A genus of _Polyzoa_.
ALETHOPTERIS (Gr. _alethes_, true; _pteris_, fern). A genus of
Ferns.
ALGAE. (Lat. _alga_, a marine plant). The order of plants comprising
the Sea-weeds and many fresh-water plants.
ALVEOLUS (Lat. _alvus_, belly). Applied to the sockets of the
teeth.
AMBLYPTERUS (Gr. _amblus_, blunt; _pteron_, fin). An order of
Ganoid Fishes.
AMBONYCHIA (Gr. _ambon_, a boss; _onux_, claw). A genus of Palaeozoic
Bivalves.
AMBULACRA (Lat. _ambulacrum_, a place for walking). The perforated
spaces or "avenues" through which are protruded the tube-feet,
by means of which locomotion is effected in the _Echinodermata_.
AMMONITIDAE. A family of Tetrabranchiate Cephalopods, so called
from the resemblance of the shell of the type-genus, _Ammonites_,
to the horns of the Egyptian God, Jupiter-Ammon.
AMORPHOZOA (Gr. _a_, without; _morphe_, shape; _zooen_, animal).
A name sometimes used to designate the _Sponges_.
AMPHIBIA (Gr. _amphi_, both; _bios_, life). The Frogs, Newts,
and the like, which have gills when young, but can always breathe
air directly when adult.
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