PTEROPODA (Gr. _pteron_, wing; and _pous_, foot). A class of the
_Mollusca_ which swim by means of fins attached near the head.
PTEROSAURIA (Gr. _pteron_, wing; _saura_, lizard). An extinct
order of Reptiles.
PTILODICTYA (Gr. _ptilon_, a feather; _diktuon_, a net). An extinct
genus of _Polyzoa_.
PTYCHOCERAS (Gr. _ptuce_, a fold; _keras_, a horn). A genus of
_Ammonitidoe_.
PULMONATE. Possessing lungs.
PYRIFORM (Lat. _pyrus_, a pear; and _forma_, form). Pear-shaped.
QUADRUMANA (Lat. _quatuor_, four; _manus_, hand). The order of
Mammals comprising the Apes, Monkeys, Baboons, Lemurs, &c.
RADIATA (Lat. _radius_, a ray). Formerly applied to a large number
of animals which are now placed in separate sub-kingdoms (e.g., the
_Coelenterata_, the _Echinodermata_, the _Infusoria_, &c.)
RADIOLARIA (Lat. _radius_, a ray). A division of _Protozoa_.
RAMUS (Lat. a branch). Applied to each half or branch of the lower
jaw, or mandible, of Vertebrates.
RAPTORES (Lat. _rapto_, I plunder). The order of the Birds of
Prey.
RASORES (Lat. _rado_, I scratch). The order of the Scratching
Birds (Fowls. Pigeons, &c.)
RECEPTACULITES (Lat. _receptaculum_, a storehouse). An extinct
genus of Protozoa.
REPTILIA (Lat. _repto_, I crawl). The class of the _Vertebrata_
comprising the Tortoises, Snakes, Lizards, Crocodiles, &c.
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