anoid
Fishes.

PTERICHTHYS (Gr. _pteron_, wing; _ichthus_, fish). A genus of
Ganoid Fishes.

PTERODACTYLUS (Gr. _pteron_, wing; _daktulos_, finger). A genus
of Pterosaurian Reptiles.

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.

RETEPORA (Lat. _rete_, a net; _porus_, a pore). A genus of
Lace-corals (_Polyzoa_).

RHAMPHORHYNCHUS (Gr. _rhamphos_, beak; _rhugchos_, nose). A genus
of Pterosaurian Reptiles.

RHINOCEROS (Gr. _rhis_, the nose; _keras_, horn). A genus of Hoofed
Quadrupeds.

RHIZOPODA (Gr. _rhiza_, a root; and _pous_, foot). The division
of _Protozoa_ comprising all those which are capable of emitting
pseudopodia.

RHYNCHOLITES (Gr. _rhugchos_, beak; and _lithos_, stone). Beak-shaped
fossils consisting of the mandibles of _Cephalopoda_.

RHYNCHONELLA (Gr. _rhugchos_, nose or beak). A genus of Brachiopods.

RODENTIA (Lat. _rodo_, I gnaw). An order of the Mammals; often
called _Glires_ (Lat. _glis_, a dormouse).

ROTALIA (Lat. _rota_, a wheel). A genus of _Foraminifera_.

RUGOSA (Lat. _rugosus_, wrinkled). An order of Corals.

RUMINANTIA (Lat. _ruminor_, I chew the cud). The group of Hoofed
Quadrupeds (_Ungulata_) whic