DORSAL. — Of or belonging to the back.

EDENTATA. — A peculiar order of Quadrupeds, characterised by the absence of at least the middle incisor (front) teeth in both jaws. (Examples, the Sloths and Armadillos.)

ELYTRA. — The hardened fore-wings of Beetles, serving as sheaths for the membranous hind-wings, which constitute the true organs of flight.

EMBRYO. — The young animal undergoing development within the egg or womb.

EMBRYOLOGY. — The study of the development of the embryo.

ENDEMIC. — Peculiar to a given locality.

ENTOMOSTRACA. — A division of the class Crustacea, having all the segments of