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.

BATRACHIANS. — A class of animals allied to the Reptiles, but undergoing a peculiar