INDEX. 



339 



Placentalia (Mammalia'), 654, 655. 



Placodus, 562. 



Placoganoidei, 492, 493, 505. 



Placoid scales of Fishes, 461, 462, 495. 



Placoidei, 477. 



Plagiaulax, 654, 669. 



Plagiostomi, 496, 497, 498. 



Planaria, 239. 



Planarida, 239, 240. 



Pla.norbis, 409, 415. 



Plantain-eaters, 620, 622. 



Plantigrada, 735. 



Plant-lice, 348. 



Plants and animals, differences between, 



13. 



Planula, 118. 

 Plasmopora. 172. 

 Plastron, 531, 532, 533. 

 Platalea, 611. 

 Plataleadce, 611. 

 Platanista, 690. 

 Platycrinus, 211. 



Platyelmia, 229 ; characters of, 230. 

 Platijrhina, 772, 775, 782. 

 Plecotus, 763. 

 Ptectognathi, 488. 

 Plectropterus, 576. 

 Plesiosauria, 561. 

 Plesiosaurus, 561, 562. 

 Pleura, of Lobster, 279 ; of Trilobite, 299. 

 Pleuracanthiis, 506. 



Pleurobrachia, 176 ; ctenophores of, 177 ; 

 canal-system of, 177 ; development of, 

 178 ; homologies of, ib. 

 Pleurobranchidce, 412. 

 Pleuronectes, 470, 471. 

 Pleuronectidce, 486. 

 Pleuronema, 100. 

 Pliohippus, 701, 702. 

 Pliopithecus, 782. 

 Plotactis, 180. 

 Pfofrws, 605. 

 Ploughshare-bone, 575. 

 Plumaster, 223. 

 Plumularia, 124. 

 Pluteus, 192, 2i iO. 

 Plyctolophus, 621. 

 Pneumatic filaments of Physophoridce, 



135. 



Pneumatocyst, 134. 

 Pneumatophore, 134, 135. 

 Pochard, 606. 

 Pocillopora, 162, 164. 

 Podophrya, 99, 101. 



Podophthalmata, 302 ; characters of, 305. 

 Podosomata, 319. 

 Podura, 336, 345, 346. 

 Poebrotherium, 722. 

 Poecilasma, 287. 

 Poephaga, 662. 

 Poephagus, 721. 

 Pole-cat, 743. 

 Polian vesicles, 196. 

 Polistes, 40, 41. 

 Polyarthra, 251. 

 Polyccelia, 175, 185. 

 Polycystina, 77, 79, 80. 

 Polydesmus, 330. 

 Polygastrica (of Ehrenberg), 97. 

 Polymorphinidea, 74. 

 Pohjnoe, 268. 

 Polypary, 100. 



Polype, 153. 

 Polypide, 373. 

 Polypidom, 110. 

 Polypite, 110. 

 Polyplectron, 614. 

 Polyprotodontia, 661, 665. 

 Polypterus, 489, 490, 491, 492, 493. 

 Polystome Infusoria, 99. 

 Polystomella, 71. 



Polystomellidea. 74. 

 Polythalamia (Foraminifera), 70. 



Polytrema, 76. 



Polytre'tnacis, 172, 185. 



Polyzoa, ,366, 367, 368 ; characters of, 371 ; 

 distinctions from Hydrozoa, 371, 372 ; 

 typical polypide of, 373 ; avicularia of, 

 374 ; lophophore of, 375 ; digestive sys- 

 stem of, 376; nervous system of, 377; 

 reproduction of, '&. ; statoblasts of, 

 377, 378; development of, 378; divi- 

 sions of, i&. ; affinities of, 379 ; distri- 

 bution of, in space and time, 379, 380. 



Polyzoarium, 372. 



Pond-snails, 415. 



Pontarachna, 322. 



Pontobdella, 262. 



Pontoporia, 690. 



Porcellana, 311. 



Porcellanous shells, 369.' 



Porcellia, 416. 



Porcupine, 755. 



Porous, 706. 



Pores of Sponges, 84, 86. 



Porifera, 83. 



Porites, 184. 



Poritidce, 164. 



Porocidaris, 194. 



Porpita, 135. 



Porpoise, 689. 



Port Jackson Shark, 498. 



Portuguese man-of-war. 109, 131, 134,135, 

 136. 



Potamochcerus, 706. 



Potamogale, 768. 



Potamogalidce, 768. 



Potoroo, 662. 



Pouched Marmots, 760. 



Pouched Rats, 757. 



Poulpe, 427. 



Prcearcturus, 314. 



Prairie Dog, 760. 



Praya, 133. 



Preabytis, 778. 



Pressirostres, 608, 611. 



Prestwichia, 314. 



Primates, 761. 



Primnoa, 174. 



Priodontes, 675, 676. 



Pristis, 500. 



Proboscidea, characters of, 728 ; distribu- 

 tion of, in time, 733. 



Proboscis, of Medusce, 128 ; of Crinoidea, 

 209 ; of Planarida, 239 ; of Nemertida, 

 240 ; of Acanthocephala, 243 ; of Ge- 

 phyrea, 255 ; of Errantia, 267 ; of l 

 doptera, 337 ; of Proboscidea, 729. 



Proboscis Monkey, 778. 



Procellaridce, 604. 



Prochilus, 740. 



Proecelia (Crocodilia), 557. 



Procyon, 741. 



Procyonidce, 741, 751. 



