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).
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