FOSSILIFEROUS.--Containing fossils.
FOSSORIAL.--Having a faculty of digging. The Fossorial Hymenoptera are a
group of Wasp-like Insects, which burrow in sandy soil to make nests for
their young.
FRENUM (pl. FRENA).--A small band or fold of skin.
FUNGI (sing. FUNGUS).--A class of cellular plants, of which Mushrooms,
Toadstools, and Moulds, are familiar examples.
FURCULA.--The forked bone formed by the union of the collar-bones in many
birds, such as the common Fowl.
GALLINACEOUS BIRDS.--An order of birds of which the common Fowl, Turkey,
and Pheasant, are well-known examples.
GALLUS.--The genus of birds which includes the common Fowl.
GANGLION.--A swelling or knot from which nerves are given off as from a
centre.
GANOID FISHES.--Fishes covered with peculiar enamelled bony scales. Most
of them are extinct.
GERMINAL VESICLE.--A minute vesicle in the eggs of animals, from which the
development of the embryo proceeds.
GLACIAL PERIOD.--A period of great cold and of enormous extension of ice
upon the surface of the earth. It is believed that glacial periods have
occurred repeatedly during the geological history of the earth, but the
term is generally applied to the close of the Tertiary epoch, when nearly
the whole of Europe was subjected to an arctic climate.
GLAND.--An organ which secretes or separates some peculiar product from the
blood or sap of animals or plants.
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