INDEX 



599 



Phrj'noidea, 392 

 Phrynosoma, 529 

 Phtynus, 393 

 Phylactolajmata, 2S7 

 Phthirius, 430 

 Phyllium, 39 

 Phyllodactylus, 529 

 Phyllopoda, 365 

 Phyllosoma, 3S0 

 Phyllostomida-, 565 

 Phylloxera, 430 

 Phylogeny, 4, 23 



proofs of, 24 

 Physalia, 220 

 Pfiyseter, 572 

 PhysonecUe, 219 

 Physophors, 219 

 Physopoda, 420 

 Pfiysostomi, 510 

 Phyto0agellata, 184 

 Phytophaga, 561 

 Pia mater, 473 

 Pica, 566 

 Picarife, 544 

 Pickerel, 510 

 Pierids, 39 

 Pieris, 433 

 Pigeons, 20, S43 

 Pike, 510 

 Pill bug, 386 

 Pilidium, 257 

 Pinealis, 470 

 Pinnipedia, 565 

 Pinnotheres, 3S2 

 PinnuL-E, 301 

 Pin worm, 266 

 Pipa, 520 

 Pipe fishes, 511 

 Piroplasma, 190 

 Pisces, 493 

 Piscicola, 284 

 Pithecanthropus, 574 

 Pituitary body, 470 

 Placenta, 491, 558, 561 

 Placentalia, 561 

 Placoid scale, 451, 494 

 Placophora, 315 

 Plagiaulax, 559 

 Plagiostomes, 504 

 Plagiotremata, 528 

 Plakina, 202 

 Planaria, 242 

 Planipennia, 422 

 Plankton, 164 

 Planorbis, 336 



Plants and animals, 159 

 Plant lice, 430 

 Plantigrade, 550 

 Planuke, 150, 215 

 Plasma, blood, 78 

 Plasmic products, 55 

 Plasmodiophora, i,Si 

 Plasmodium, 180, 1S9 

 Plasmogamy, 168 

 Plastin, 57 

 Plastron, 527 

 Platanista, 571 

 Plathelminthes, 238 

 Plitodes, 238 

 Platyrrhina;, 574 

 Plecoptera, 420 

 Plectognathi, 512 

 Pleon, 351 

 Pleopoda, 352 

 Plesiosauria, 526 

 Plethodon, 520 

 Pleura, 364, 404 

 Pleuracanthus, 507 

 Pleural cavity, 481 

 Pleurobrachia, 235 

 Pleurocercoid, 251 

 Pleurodont, 529 

 Pleuronectidas, 511 

 Pleuroperitoneal cavity, 4S1 

 Plexus, sympathetic, 473 

 Plictolophus, 544 

 Pliohippus, 569 

 Plover, 544 

 Plumatella, 287 

 Plumes, 534 

 Plumularia, 218 

 Pluteus, 294 

 Pneumatic bones, 538 



duct, 502 

 Pneumatophore, 218 

 Pneumodermon, 335 

 Pneumogastric nerve, 471 

 Podophrya, 59, 19S 

 Podophthalmia, 375 

 Podura, 419 

 Poikilothermal, 104 

 Poison teeth, 531 

 Polar bodies, 133 

 Pole capsules, 190 



fields, 234 

 Polian vesicles, 292 

 Polybostrichus, 275 

 Polychsrus, 242 

 Polycha;tK, 276 

 Polycladidea, 242 



Polyclinum, 446 

 Polyclonia, 222 

 Polydesmids, 434 

 Polyergus, 427 

 Polygordius, 278 

 Polyhybrids, 140 

 Polymorphism, 154 

 Polynoe, 277 

 Polyodon, 508 

 Polyp, 208 ' 

 Polypid, 2S5 

 PolyphemidK, 366 

 Polyprotodonta, 560 

 Polypterus, 508 

 Polyscelis, 242 

 Polyspermy, 134 

 Polystomea:, 244 

 Polystomella, 180 

 Polystomium, 244 

 Polythalamia, 179 

 Polytroche, 273 

 Polyzoa, 2 84 

 Pond snails, 336 

 Ponerida;, 426 

 Pons Varolii, 552 

 Pontella, 369 

 Pontobdella, 284 

 Pontodrilus, 272 

 Population, 44 

 Porcellana, 381 

 Porcellio, 386 

 Porcupines, 566 

 Fori abdominales, 481 

 Porifera, 201 

 Porites, 232 

 Porosa, 232 

 Porpita, 220 

 Portal vein, 4S3 

 Portuguese man-of-war, 220 

 Portunid;E, 382 

 Post abdomen, 351 

 Post cava, 485 

 Post frontal bone, 462 

 Post scutellum, 408 

 Post trematic, 472 

 Potato beetle, 424 

 Powder down, 534 

 Prairie dog, 566 

 Praya, 155, 220 

 Praying mantes, 421 

 Prascoces, 541 

 Precava, 485 

 Preclaviie, 550 

 Precious coral, 230 

 Prefrontal bones, 462 



