enalios_, marine; _saura_, lizard), Sometimes
employed as a common term to designate the extinct Reptilian
orders of the _Ichthyosauria_ and _Plesiosauria_.

EOCENE (Gr. _eos_, dawn; _kainos_, new or recent). The lowest
division of the Tertiary rocks, in which species of existing
shells are to a small extent represented.

EOPHYTON (Gr. _eos_, dawn; _phuton_, a plant). A genus of Cambrian
fossils, supposed to be of a vegetable nature.

EOZOOeN (Gr. _eos_, dawn; _zooen_, animal). A genus of chambered
calcareous organisms found in the Laurentian and Huronian formations.

EQUILATERAL (Lat. _oequus_, equal; _latus_, side). Having its
sides equal. Usually applied to the shells of the _Brachiopoda_.
When applied to the spiral shells of the _Foraminifera_, it means
that all the convolutions of the shell lie in the same plane.

EQUISETACEAE (Lat. _equus_, horse; _seta_, bristle). A group of
Cryptogamous plants, commonly known as "Horse-tails."

EQUIVALVE (Lat. _oequus_, equal; _valvoe_, folding-doors). Applied
to shells which are composed of two equal pieces or valves.

ERRANTIA (Lat. _erro_, I wander). An order of _Annelida_, often
called _Nereidea_, distinguished by their great locomotive powers.

EUOMPHALUS (Gr. _eu_, well; _omphalos_, navel). An extinct genus
of Univalve Molluscs.

EURYPTERIDA (Gr. _eurus_, broad; _pteron_, wing). An extinct
sub-order of _Crustacea_.

EXOGYRA (Gr. _exo_, outside; _guros_, circle). An extinct genus
of Oysters.

FAUNA (Lat. _Fauni_, the rural deities of the Romans). The general
assemblage of the animals of any region or district.

FAVOSITES (Lat. _favus_, a honeycomb). A genus of Tabulate Corals.

FENESTELLIDAE. (Lat. _fenestella_, a little window). The
"Lace-corals," a group of Palaeozoic Polyzoans.

FILICES (Lat. _filix_, a fern). The order of Cryptogamic plants
comprising the Ferns.

FILIFORM (Lat. _filum_, a thread; _forma_, shape). Thread-shaped.

FLORA (Lat. _Flora_, the goddess of flowers). The general assemblage
of the plants of any region or district.

FORAMINIFERA (Lat. _foramen_, an aperture; _fero_, I carry).
An order of Protozoa, usually characterised by the possession
of a shell perforated by numerous pseudopodial apertures.

FRUGIVOROUS (Lat. _frux_, fruit; _voro_, I devour). Living upon
fruits.

FUCOIDS (Lat. _fucus_, sea-weed; Gr. _eidos_, likeness). Fossils,
often of an obscure nature, believed to be the remains of sea-weeds.

FUSULINA (Lat. _fusus