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