438 



INDEX. 



saurian, remarkable for its long 

 neck, 671. 



Pleurotoma v ria, an extinct genus of 

 univalve shells. 



Plex'us (Gr. TrXtKo, I twine), a bun- 

 dle of nerves or vessels interwoven 

 or twined together. 



Pli'cse (Lat. plica, a fold), folds of 

 membrane. 



Plumose x (Lat. pluma, a feather), fea- 

 thery, or like a plume of feathers. 



Plutonic or igneous rocks, 646. 



PneumatMc (Gr. Trvtvpa, breath), 

 belonging to the air, and air- 

 breathing organs. 



Pneumogas'tric nerve, 105. 



Podurel'la, a genus of insects, their 

 mode of progression, 299. 



Polygas'tria (Gr. TTO\VQ, many ; 

 yaortp, a stomach), infusorial 

 animalcules which have many 

 assimilative sacs or stomach. 



Pol'ypi (Gr. 7r6\vc, many ; Trove;, a 

 foot), radiated animals with many 

 prehensile organs radiating from 

 around the mouth. 



Polypifera, digestion in the, 313, 

 317. 



Prehen'sion, act of grasping. 



Primary, or palaeozoic age, the reign 

 of fishes, 658, 659669. 



Primitive fibres of the nerve, 80. 



Progression, modes of, 289 307. 



Prolig'erous, the part of the egg j 

 bearing the embryo. 



Protho'rax (Gr. ir'po, before, and I 

 OopaZ), the first of the three seg- 

 ments which constitute the thorax 

 in insects. 



Protraet'ile, capable of being ex- 

 tended. 



Pro'teus, a genus of batrachian rep- 

 tiles, 626. 



Protosau'rus (Gr. Trpwrog, first ; 

 aavpoq, a lizard), an extinct genus 

 of saurian reptiles, 672. 



Protozoa (wptirog, first ; woj/, ani- 

 mal), the, assumed, simplest forms 

 of animal life, xxiv. 



Pterich'thys (Gr. irnpov, a wing ; 

 tX0 y e> a fish), an extinct fish, of 

 very peculiar form, 667. 



Pterodac'tylus (Gr. irnpov, a "wing ; 

 SdxTvXoQ, a finger), an extinct fly- 

 ing reptile, 671. 



Pter'opods (Gr. TTTtpov, a wing; 

 rrovg, a foot), mollusks, in which 

 the organs of motion are shaped 

 like wings, xxiii. 



Pul'mogrades (Lat. pulmo, a lung ; 

 gradior, I walk), medusae which 

 swim by contractions of the res- 

 piratory disc. 



Pul'monata (Lat. pulmo,\ung), gaste- 

 ropods that breathe by lungs, xxxiii. 



Pu'pa (Latin, doll, or little image), 

 the passive state of an insect im- 

 mediately preceding the last. 



Pylorus (Gr. TrvXwpoe), the aper- 

 ture which leads from the stomach 

 to the intestine. 



Pyr'iform (Lat. pyrum, a pear), pear- 

 shaped. 



Py'rula, a genus of univalve shells. 



QUAD'RIFID (Lat. quatuor, four ; 

 findo, 1 cleave), cleft in four parts. 



Quadruma v nous (Lat. quatuor, four ; 

 manus, a hand), four-handed ani- 

 mals, as monkeys. 



Quad'ruped (Lat. quatuor, four; pes, 

 a foot), animals with four legs. 



RADIA'TA (Lat. radius, a ray), or 

 Radiates, the lowest primary divi 

 sion of the animal kingdom, xxi. 



Radia'ta, nervous system of the, 117; 

 jaws, 335 ; of the trias period, 

 670 ; of the oolite, 674. 



Radius, one of the bones of the arm, 

 273. 



Ramose' (Lat. ramus, a branch), 

 branched. 



Reasoning, 189. 



Relation, functions of, 76. 



Remak. band of, 55. 



Ren'iform (Lat. ren, a kidney), kid- 

 ney-shaped. 



