ORTHOCERATIDAE (Gr. _orthos_, straight; _keras_, horn). A family
of the _Nautilidoe_, in which the shell is straight, or nearly
so.
ORTHOPTERA (Gr. _orthos_, straight; _pteron_, wing). An order
of Insects.
OSTEOLEPIS (Gr. _osteon_, bone; _lepis_, scale). An extinct genus
of Ganoid Fishes.
OSTRACODA (Gr. _ostrakon_, a shell). An order of small Crustaceans
which are enclosed in bivalve shells.
OTODUS (Gr. _ota_, ears; _odous_, tooth). An extinct genus of
Sharks.
OUDENODON (Gr. _ouden_, none; _odous_, tooth). A genus of Dicynodont
Reptiles.
OVIBUS (Lat. _ovis_, sheep; _bos_, ox). The genus comprising the
Musk-ox.
PACHYDERMATA (Gr. _pachus_, thick; _derma_, skin). An old Mammalian
order constituted by Cuvier for the reception of the Rhinoceros,
Hippopotamus, Elephant, &c.
PALAEASTER (Gr. _palaios_, ancient; _aster_, star). An extinct
genus of Star-fishes.
PALAEOCARIS (Gr. _palaios_, ancient; _karis_, shrimp). An extinct
genus of Decapod Crustaceans.
PALAEOLITHIC (Gr. _palaios_, ancient; _lithos_, stone). Applied
to the rude stone implements of the earliest known races of men,
to the men who made these implements, or to the period at which
they were made.
PALAEONTOLOGY (Gr. _palaios_, ancient; and _logos_, discourse).
The science of fossil remains or of extinct organised beings.
PALAEOPHIS (Gr.
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