Applied
to certain impressions in the Potsdam sandstone of North America,
believed to have been produced by large Crustaceans.
PROTOPHYTA (Gr. _protos_; and _phuton_, plant). The lowest division
of plants.
PROTOPLASM (Gr. _protos_; and _plasso_ I mould). The elementary
basis of organised tissues. Sometimes used synonymously for the
"sarcode" of the _Protozoa_.
PROTOROSAURUS or PROTEROSAURUS (Gr. _protos_, first; _orao_, I
see or discover; _saura_, lizard: or _proteros_, earlier; _saura_,
lizard). A genus of Permian lizards.
PROTOZOA (Gr. _protos_; and _zooen_, animal). The lowest division
of the animal kingdom.
PSAMMODUS (Gr. _psammos_, sand; _odous_, tooth). An extinct genus
of Cestraciont Sharks.
PSEUDOPODIA (Gr. _pseudos_, falsity; and _pous_, foot). The
extensions of the body-substance which are put forth by the
_Rhizopoda_ at will, and which serve for locomotion and prehension.
PSILOPHYTON (Gr. _psilos_, bare; _phuton_, plant). An extinct
genus of Lycopodiaceous plants.
PTERANODON (Gr. _pteron_, wing; _a_, without; _odous_, tooth).
A genus of Pterosaurian Reptiles.
PTERASPIS (Gr. _pteron_, wing; _aspis_, shield). A genus of Ganoid
Fishes.
PTERICHTHYS (Gr. _pteron_, wing; _ichthus_, fish). A genus of
Ganoid Fishes.
PTERODACTYLUS (Gr. _pteron_, wing; _daktulos_, finger). A genus
of Pterosaurian Reptiles.
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