718 



Index 



Phosphocreatine, 120 

 Phosphoric acid, 120 

 Phosphorus, 26, 29, 35, 93, 94, 145, 146, 

 650 

 blood level, 232, 233 

 metabolism of, 231-232, 250 

 Photophore, 82 

 Phototaxis, 355 

 Phrenic artery, 168 



vein, 168 

 Phrynosoma, 607 

 Phylogeny, 644-647 

 Phyllostomus, 630 

 Phylum, 44, 344 

 Physalia, 393, 397 

 Physeter, 632, 637 

 Physical changes in muscle, 122 

 Physics, 25-35 

 Physiology, 21 

 Phytomastigina, 353-357 

 Pia mater, 71,201 

 Piciformes, 625 

 Pickerel. 419 

 Pig, 88, 91, 263, 630, 640 

 gestation period, 292 

 parasites of, 430, 434. 435, 445, 461, 

 516 

 Pigeons, 131, 197, 625 

 Pigment, 82, 217, 249, 503 



cells, 216, 217. 247 

 Pigmentation, 82 

 Pike. 419, 587. 588, 589, 590 

 Pilidium, 422 

 Pimple. 81 

 Pineal body, 69, 98. 199, 249 



eye, 571 

 Pinna, 220 

 Pinnipedia, 638 

 Pinnule, 553 



Pinworm (see Enterobius), 435 

 Pipa. 596. 599 

 Pipefish. 590 

 Pipidae, 596 



Pisces, 567 (see also individual 

 classes) 

 origin and development, 567-570 

 Pit viper. 608, 609. 610 

 Pithecanthropus, 642 

 Pitocin, 247-248 

 Pitressin, 247-248 



Pituitary gland, 69, 72, 103, 199, 243- 

 248 

 anterior lobe, 72, 243, 244-247 

 intermediate lobe, 72. 243, 247 

 posterior lobe, 72, 243, 247-248 

 Pituitrin, 247, 248 

 Pituophis, 608 

 Placenta, 164, 182, 242, 292 

 Placobdella, 449 

 Placodermi, 567, 568, 594 



Flaccid scale, 83, 84, 87, 575 

 Planaria, 401-409 

 classification, 45, 347 

 nervous system, 212 

 Plane, frontal, 51 

 median, 51 

 sagittal, 51 

 transverse, 51 

 Plankton, 554, 660 

 Plant bug, 539 



nematode, 429 

 Planula, 385, 391, 393. 395 

 Plasma, blood, 178-179 



membrane, 267, 269 

 Plasmagel, 359 

 Plasmagene, 315, 372 

 Plasmasol, 359 



Plasmodium, 352, 363, 365-367 

 Plasmodroma, 353 

 Plastron, 604 

 Platelet, 178, 179, 180 

 Platydorina, 355, 644 

 Platyhelminthes, 347. 401-422, 645 

 characteristics, 402-403 

 classes, 404 

 classification, 45, 347 

 nervous system, 192, 212 

 reproduction, 252 

 Platypus, 256 

 Plectognathi, 590 

 Pleistocene epoch, 342. 641, 642 

 Plerocercoid larva, 419 

 Plesiosaur, 603, 612, 613 

 Plethodon, 596, 598 

 Plethodontidae, 596, 597, 598 

 Pleura, 152, 153 



of Cambarus, 492 

 Pleural cavity, 153 

 Pleurisy, 153 

 Pleurobrachia, 399-400 

 Pleurobranch, 502 

 Pleurum, 522 

 Plexus, 171 

 brachial, 204 

 cervical, 204 

 lumbar-sacral, 204 

 Pliocene epoch, 333, 342, 641 

 Pliohippus, 333 

 Pluteus, 549. 550 

 Pneumonia, 158 

 Podical plate, 523 

 Podobranch, 501 

 Podophrya, 352, 374 

 Poikilothermic animals, 76, 160, 174. 



649 

 Point, pivot, 106, 107 

 Poison gland. 54. 82, 131 

 Polar body, 275. 277 

 Polian vesicle, 552 





