The first or seed-leaves of plants.

A class of articulated animals, having the skin of the body generally more or less hardened by the deposition of calcareous matter, breathing by means of gills. (Examples, Crab, Lobster, Shrimp, etc. )

The old generic term for the Beetles known as Weevils, characterised by their four-jointed feet, and by the head being produced into a sort of beak, upon the sides of which the antennae are inserted.

Of or belonging to the skin.

The wearing down of land by the action of the sea or of meteoric agencies.

The wearing away of the surface of the land by water.

A series of Palaeozoic rocks, including the Old Red Sandstone.

A class of plants characterised by having two seed-leaves, by the formation of new wood between the bark and the old wood (exogenous growth) and by the reticulation of the veins of the leaves. The parts of the flowers are generally in multiples of five.

The separation or discrimination of parts or organs which in simpler forms of life are more or less united.

Having two distinct forms: Dimorphism is the condition of the appearance of the same species under two dissimilar forms.

Having the organs of the sexes upon distinct individuals.

A peculiar form of Greenstone.

Of or belonging to the back.

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.)