FELIDÆ.—The Cat-family.
FERAL.—Having become wild from a state of cultivation or domestication.
FLORA.—The totality of the plants growing naturally in a country, or during a given geological period.
FLORETS.—Flowers imperfectly developed in some respects, and collected into a dense spike or head, as in the Grasses, the Dandelion, &c.
FOETAL.—Of or belonging to the foetus, or embryo in course of development.
FORAMINIFERA.—A class of animals of very low organisation and generally of small size, having a jelly-like body, from the surface of which delicate filaments can be given off and retracted for the prehension of external objects, and having a calcareous or sandy shell, usually divided into chambers and perforated with small apertures.
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.