NDEX 



715 



Plasmosol, 110 



Plasmochin, 184 



Plasmodium vivax, 131, 132 



Planula, 149, 151, 158 



Platelet, 506 



Platyhelminthes, 160 



Platypus. See Duckbill 



Pleistocene (epoch), 625 



Pleodorina, 66, 67 



Pleura, 479 



Pleural space (cavity), 479, 481 



Pleuruni, 207 



Plexus, brachial, 309, 312 

 sciatic, 309, 312 



Pliocene (epoch), 625 



Philohippus, 657 



Poikilothermal, 44, 278 



Poison sac, 232 



Polar body, 557, 558 



Polarize, 413, 414 



Polled (hornless), 654 



Pollen basket, 230, 231 

 brush, 230, 231 

 packer, 230, 231 

 Polycladida, 166 

 Polydactyly, 613, 654 

 Polymorphism, 151 

 Polyp, 141, 149 

 Polyploidy, 609 

 Polysaccharide, 41 

 Pond life, 99, 100 

 Pons, 420 

 Populations, 102 

 Pore cell, 138, 139 

 Porifera, 136 

 Porpoise, 640 



Portuguese man-of-war. See Phtjsolia 

 Postganglionic fibers, 426 

 Potency, 571, 572 

 Praying mantis, 240 

 Pre-Cambrian (period), 625 

 Precipitin reaction, 510 

 Predation, 97 

 Preformation, 561 

 Premaxillu, 305 

 Premolar, 455 

 Prepuce, 540 

 Pressure, blood, 503-504 

 diastolic, 504 

 systolic, 504 

 Primate, 347-361 



relationships, 348 

 Primitive streak, 564, 566 

 Prismatic layer, 255 

 Proboscidea, 345 

 Proboscis, 134, 233 

 Prochordates, 283-285 

 Procyon lotor. See Raccoon 

 Progesterone, 439, 440 

 Proglottids, 171, 172 

 Prophase, 552, 553, 554 

 Propolis, 234 

 Proprioceptors, 408, 409 

 Prosecretin, 463, 464 



Prostate gland, 538, 540 

 Prostomium, 191, 192 

 Prosobranchiata, 263 



Protease, 460 



Protective coloration, 664, 665 



Protein, 42 



Proteose, 460, 464 



Proterozoic (era), 625 



Prothrombin, 507 



Protons, 26 



Protopod, 210 



Protoplasm, 34 



characteristics of, 34, 35 

 chemical composition of, 39 

 physical nature, 45 



Protozoa, 109-135 



Pseudopods, 110 



Psychology, 16 



Psychosomatic medicine, 425 



Pterodactyl, 661, 662 



Pterygoid, 305 



Ptyalin, 43, 44, 455 



Pubis, 305, 306, 376, 381 



Pulmocutaneous artery, 314 



Pulmonata, 263 



Pulp cavity (chamber), 454 



Punnett square, 592, 593 



Pupa, 229, 235 



Purkinje, 57 



Pylorus, 453, 457 



Pyridoxine, 471, 472 



Python, 640 



Quadriceps femoris, 386 

 Quaternary (period), 625 

 Queen, 228, 229 

 Quinine, 133 



Rabbit, 375, 571, 596, 644 



Raccoon, 341 



Radial canals, 150, 151, 269, 271 



nerve, 269, 272 



symmetry, 77, 78 

 Radiating canals, 115, 116 

 Radiations, 608 

 Radiolaria, 128 

 Radio-ulna, 305 

 Radius, 305, 306, 376, 381 

 Radula, 254 



Ramus, white and gray, 425, 426 

 Rana, catesbiana, 300 



pipiens, 299 



sylvatica, 301 

 Range, 643 

 Rat, 345, 439 



flea, 236 

 Rattlesnake, 329 

 Rattus norvegicus. See Rat 

 Ray, 650 



Reabsorption, 526 

 Receptors, 394-410 

 Recessi\ e trait, 583 



