_polus_, many; _pous_, foot). Restricted to the single
individual of a simple _Actinozooen_, such as a Sea-anemone, or
to the separate zooids of a compound _Actinozooen_. Often applied
indiscriminately to any of the _Coelenterata_, or even to the
Polyzoa.
POLYPORA (Gr. _polus_, many; _poros_, a passage). A genus of
Lace-corals (_Fenestellidoe_).
POLYTHALAMOUS (Gr. _polus_; and _thalamos_, chamber). Having
many chambers; applied to the shells of _Foraminifera_ and
_Cephalopoda_.
POLYZOA (Gr. _polus_; and _zooen_, animal). A division of the
_Molluscoida_ comprising compound animals, such as the
Sea-mat--sometimes called _Bryozoa_.
PORIFERA (Lat. _porus_, pore; and _fero_, I carry). Sometimes
used to designate the _Foraminifera_, or the _Sponges_.
PRAEMOLARS (Lat. _proe_, before; _molares_, the grinders). The
molar teeth of Mammals which succeed the molars of the milk-set
of teeth. In man, the bicuspid teeth.
PROBOSCIDEA (Lat. _proboscis_, the snout). The order of Mammals
comprising the Elephants.
PROCOELOUS (Gr. _pro_, before; _koilos_, hollow). Applied to vertebrae
the bodies of which are hollow or concave in front.
PRODUCTA (Lat. _productus_, drawn out or extended). An extinct
genus of Brachiopods, in which the shell is "eared," or has its
lateral angles drawn out.
PROTICHNITES (Gr. _protos_, first; _ichnos_, footprint).
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