INDEX 



491 



Parapophysis, 64 



Parasitism, 348 



Parasympathetic nervous system, 



183 

 Parasphenoid, 56 

 Parathyroid gland, 212 

 Parenchyma, 399 

 Parietal organ, 176 

 Parotid gland, 94 

 Parotoid gland, 331 

 Parthenogenesis, 154, 437 

 Pectineus muscle, 81 

 Pectoral girdle, 65, 67 

 Pectoralis muscle, 76 

 Pediculus, 430 

 Pelagic animals, 361 

 Pelecypoda, 434 

 Pelvic girdle, 67, 68 

 Pelvic vein, 130 

 Pepsin, 32, 106 

 Perforatorium, 241 

 Pericardium, 30 

 Peripatus, 423 

 Perilymphatic fluid, 200 

 Periplaneta, 429 

 Perissodactyla, 457 

 Perithelium, 122 

 Peritrichida, 383 

 Permian time, 364 

 Peroneus muscle, 82 

 Petromyzon, 447 

 Phalanges, 69, 70 

 Phalangium, 422 

 Pharynx, 32 

 Phenotype, 321 

 Pholidota, 456 

 Phoronidea, 413 

 Phoronis, 414 

 Photiniis, 431 

 Photosynthesis, 10 

 Phrynosoma, 451 

 Phthirius, 430 

 Phyllium, 335 

 Phylloxera, 430 

 Physalia, 394, 395 

 Physiology, 2, 4 

 Phytomastigophora, 368 

 Pieris, 431 



Pigeons, 235, 279, 298 



Pigment, 354 



Pineal organ, 29 



Pinealis, 176 



Pinna, 202 



Pinnipedia, 456 



Pisces, 447 



Pithecanthropus erectus, 305 



Pitocin, 209 



Pitressin, 209 



Pituitary gland, 176, 206, 207, 209 



Placenta, 162, 423 



Placodes, 252 



Placoid scale, 49, 59, 90 



Plain muscle, 95 



Planaria, 192 



Planocera, 50, 51, 400 



commensalism of, 346 



polar bodies of, 229 

 Plantigrade, 71 

 Plasma, 134 

 Plasmodium, 378 

 Plasmodroma, 368 

 Platyhelminthes, 399 

 Platypus, 454 

 Pleurobrachia, 399 

 Pleuroperitoneal cavity, 30 

 Plumatella, 412 

 Poikilothermous, 351 

 Poison gland, 28 

 Polar bear, 334 

 Polar body, 228, 229 

 Polocyte, 228 



POLYCHAETA, 416 

 POLYCLADIDA, 400 



Polygordius, 416 

 Polyneuritis, 110 

 Polynices, 434 

 Polyodon, 448 

 Polyp, 389 

 Polypterus, 448 

 Polystoma, 405 

 Porcellio, 422 



PORIFERA, 385 



Porthetria, 431 



Posterior pituitary lobe, 206, 209 

 Potato beetle, 431 

 amitosis in, 225 



