486 



GLOSSARY. 



NAVICELLA, lat., navicula, a little 

 boat ; shell of infusoria. 



NEIUTA, hollow ; a genus of shells. 



NERITINA, like uerita; a genus of 

 shells. 



NEUROPTERA, insects having wings 

 finely nerved, as the dragon-fly. 



NODOSARIA, lat., nodus, a knot. 



NODULE, a rounded irregularly- 

 shaped mass, as a flint. 



NORMAL, regular or legitimate; thus 

 normal form means regular or 

 legitimate form. 



NUCLEUS, the centre or point around 

 which other matter is collected. 



NUCULA, a small nut; a genus of 

 shells. 



NUMMULITE, an extinct many-cham- 

 bered shell, resembling a coin ; 

 lot., nummus, whence its name. 



NUMMULITES, lat., nummulus, a 

 small coin. 



0. 



OBSIDIAN, volcanic glass. 



OCCIPUT, the back part of the skull. 



OCTOPUS, a foot ; a genus of cephalo- 

 poda. 



OLIVA, an olive ; a genus of shells. 



ONCHIDIUM, a genus of gasteropoda. 



OOLITE, limestone composed of an 

 aggregation of spheroidal, egg-like 

 particles. 



OPERCULUM, a lid; applied to the 

 gill-covering in fishes, and the 

 plate that closes the aperture in 

 univalve shells. 



OPHIDIAN, the snake and serpents. 



ORBICULA, a little ball ; a genus of 

 shells. 



ORBICULINA, lat., orbiculus, a little 

 orb ; a genus of foramenifera. 



ORBITULITES, lat,, orbis, an orb ; a 

 genus of corals. 



ORNITHORYNCHUS, a genus of animals 



having the mouth produced into- 

 a beak, like a bird. 



ORTHOCERA, straight horn ; a genus 

 of cephalopoda. 



ORTHOCERATITE, a straight many- 

 chambered extinct shell. 



OSSICULA, minute bones. 



OSTREA, an oyster. 



OTION, a little ear; a genus of 

 cirrhipoda. 



OUTLIERS, detached portions of a 

 main mass of strata. 



OVATE, egg-shaped. 



OVIPAROUS, animals which bring 

 forth eggs. 



OVULA, lat, ovum, an egg ; a genus 

 of shells. 



OXYDE, the combination of oxygen 

 with a metal. 



OXYGEN : for a complete explanation, 

 consult various works on chemis- 

 try. The beginner may be con- 

 tented with knowing, that it con- 

 stitutes the vital portion of the 

 atmosphere, and enters so largely 

 into the composition of rocks, as 

 to constitute a considerable part 

 of the solid strata of the earth. 



P. 



PACHYDERMATA, an order of animals, 

 including the elephant, rhinoceros, 

 horse, pig, &c., distinguished, as 

 their name, which is derived from 

 the .Greek, imports, by having 

 thick skins. 



PALAEONTOLOGY, the science which 

 treats of extinct animals. 



PAL^OTHERIUM, an extinct quadru- 

 ped, allied to the tapir. 



PALUDINA, a freshwater shell, of 

 snail-like shape. 



PALUDINA, lat., palus, a marsh. 



PANDORA, alluding to Pandora's box. 



PARIETES, the walls of the cavities in 

 animals. 



