GLOSSARY. 411 



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. ptuche*, a fold; keras, a horn). A genus of 



Ammonitida 



PULMONATE. Possessing lungs. 

 PYRIFORM (Lat. pyrus, a pear; and forma, form). Pear-shaped. 



QUADRUMANA (Lat. quatuor, four; manus, hand). The older 

 of Mammals comprising the Apes, Monkeys, Baboons, Lemurs, 

 etc. 



R 



RADIATA (Lat. radius, a ray). Formerly applied to a large 

 number of animals which are now placed in separate sub- 

 kingdoms (e. g., the Ccclenterata, the Echinodermata, the In- 

 fusoria, etc.) 



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, etc. 



RETEPORA (Lat. retc, 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. 



RHTZOPODA (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) which "ruminate" or chew 

 the cud. 



