ANALOGY.--That resemblance of structures which depends upon similarity of
function, as in the wings of insects and birds. Such structures are said
to be ANALOGOUS, and to be ANALOGUES of each other.
ANIMALCULE.--A minute animal: generally applied to those visible only by
the microscope.
ANNELIDS.--A class of worms in which the surface of the body exhibits a
more or less distinct division into rings or segments, generally provided
with appendages for locomotion and with gills. It includes the ordinary
marine worms, the earth-worms, and the leeches.
ANTENNAE.--Jointed organs appended to the head in Insects, Crustacea and
Centipedes, and not belonging to the mouth.
ANTHERS.--The summits of the stamens of flowers, in which the pollen or
fertilising dust is produced.
APLACENTALIA, APLACENTATA or APLACENTAL MAMMALS.--See MAMMALIA.
ARCHETYPAL.--Of or belonging to the Archetype, or ideal primitive form upon
which all the beings of a group seem to be organised.
ARTICULATA.--A great division of the Animal Kingdom characterised generally
by having the surface of the body divided into rings called segments, a
greater or less number of which are furnished with jointed legs (such as
Insects, Crustaceans and Centipedes).
ASYMMETRICAL.--Having the two sides unlike.
ATROPHIED.--Arrested in development at a very early stage.
BALANUS.--The genus including the common Acorn-shells which live in
abundance on the rocks of the sea-coast.
Pages:
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789