_palaios_, ancient; _ophis_, serpent). An extinct
genus of Snakes.
PALAEOSAURUS (Gr. _palaios_, ancient; _saura_, lizard). A genus
of Thecodont Reptiles.
PALAEOTHERIDAE. (Gr. _palaios_, ancient; _ther_, beast). A group
of Tertiary Ungulates.
PALAEOZOIC (Gr. _palaios_, ancient; and _zoe_, life). Applied to
the oldest of the great geological epochs.
PARADOXIDES (Lat. _paradoxus_, marvellous). A genus of Trilobites.
PATAGIUM (Lat. the border of a dress). Applied to the expansion
of the integument by which Bats, Flying Squirrels, and other
animals support themselves in the air.
PECOPTERIS (Gr. _peko_, I comb; _pteris_, a fern). An extinct
genus of Ferns.
PECTEN (Lat. a comb). The genus of Bivalve Molluscs comprising
the Scallops.
PECTORAL (Lat. _pectus_, chest). Connected with, or placed upon,
the chest.
PENTACRINUS (Gr. _penta_, five; _krinon_, lily). A genus of Crinoids
in which the column is five-sided.
PENTAMERUS (Gr. _penta_, five; _meros_, part). An extinct genus
of Brachiopods.
PENTREMITES (Gr. _penta_, five; _trema_, aperture). A genus of
_Blastoidea_, so named in allusion to the apertures at the summit
of the calyx.
PERENNIBRANCHIATA (Lat. _perennis_, perpetual; Gr. _bragchia_,
gill). Applied to those Amphibia in which the gills are permanently
retained throughout life.
PERISSODACTYLA (Gr.
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