Foraminifera. The name given to a group of many-chambered shells, generally microscopic, the chambers communicating by a small open orifice (foramen).
Fossil. A word originally applied to all substances dug out of the earth, including therefore all minerals, but now limited in its application to the remains of organic beings, whether vegetable or animal, buried beneath the surface.
Fossiliferous. Containing fossils or organic remains.
Frith. A deep and comparatively narrow arm of the sea.
Fronds. The leaf of a fern is called a frond.
Fucoid. That which resembles a fucus, or seaweed:—fossil remains of fuci are called fucoids.
Fusiform. Spindle-shaped.
Galena. Sulphuret of lead.
Ganoid. A group of fishes having enameled scales.
Gasteropoda. A group of shell-bearing animals covered by one valve, and having a fleshy foot attached to the belly.