554 



INDEX 



Parental care, 117, 461 



Parthenogenesis, 117 



Passeres, 430 



t'ea-fowl, 422 



Pearl oyster, 260 



Pearls, 258 



Pecten, 260 



Pelagic fauna, 137 



Pelecanus, 417 



Pelecypoda, 258 



Penguin, 414 



Pennaria, 186 



Perennibranchiata, 384 



Pericardial sinus, 284 



Perichondrium, 56 



Periosteum, 57 



Peripatus, 297 



Peripheral nervous system, 80, 348, 



352 (see nervous system). 

 Perissodactyla, 454 

 Peritoneum, 317 

 Periwinkles, 261 

 Petrels, 415 

 Pharyngognathi, 374 

 Pharynx, 334 

 Pheasant, 422 

 Philosophy of biology, 525 

 Phoenicopterus, 416 

 Pholas, 259 

 Phyla, key to, 148 

 Physalia, 188 



Physiology, defined, 4; history of, 523 

 Physopoda, 300 

 Physostomi, 373 

 Phytophaga, 303 

 Pici, 427 

 Pieris, 304 

 Pigeon, 418 

 Pigments, 11 

 Pituitary body, 342 

 Placenta, 449 

 ■ Placentalia, 440, 451 

 Planarians, 194 

 Planorbis, 262 

 Plant-lice, 300 

 Planula, 185 



_ Plasma (blood), 58, 339 

 Plastron, 393 

 Platyhelminthes, 193 

 Plecoptera, 299 



Plectognathi, 374 



Pleura, 338 



Pleuron, 267 



Plexus, 353 



Plover, 418, 434 



Plumatella, 193, 203 



Polar bodies, 33, 34, 35 



Polychaeta, 237 



Polygordius, 235 



Polymorphism, 120, 189, 190 



Polyp, 176-179 



Polyzoa, 203 



Porcupine, 457 



Porifera, 148, 165 



Porpoises, 453 



Potato-beetle, 305 



Prairie dog, 458 



Premolar (teeth), 444 



Primary vesicles (brain), 348 



Primates, 452, 459 



Primordial germ cells, 32, 33, 34 



Proboscidea, 455 



Procotodoeum, 68, 281 



Proglottis (segment), 199, 200 



Promorphology — defined, 3, 92; illus- 

 trated, 92 



Prophase, 24 



Prostomium, 230 



Protective resemblance, 127 



Proteids, 11 



Prothorax, 273 



Protoplasm, 10; chemical composition 

 of, 1 1 ; physical structure, 1 1 ; physi- 

 ology, 12, 66; relation to life, 9 



Protopodite, 268 



Protopterus, 375 



Prototheria, 440 



Proto-vertebrata, 312 



Protozoa, 149, 150 , 



Proventriculus, 281, 405 



Pseudopodia, 155 



Psychology, 471 



Ptarmigan, 419 



Pterophylla, 300 



Pteropus, 4S8 



Pulp-cavity (see teeth), 443 



Pupa, 289 (see metamorphosis). 



Purity of gametes, 501 

 Pygopodes, 414 

 Pyloric caeca, 282, 317 



