870 



INDEX 



Psittacifonnes, 841 

 Psocoptcra, 837 

 PtemmnUm, 464, 840 

 Plerubrancliia. 360, 838 

 Pleropods, 251, 834 

 Pterosauiia. 464, 840 

 Pterygota, 313, 837 

 Ptyalin, 68, 81, 517 

 Pubis, 401, 51^ 

 Public health, 828 

 Pulniocutaneous arch, 408 

 Pulmonary artery, 409, 549 

 Pulmonary circulation, 548 

 Pulmonary veins, 410 

 Pulmonata, 252, 834 

 Pulp, 516 

 Pulvillus, 308 

 Punnett, R. C, 6.54 

 Pupa, 316 

 Pupil, 576 

 Purkinjc, S3 

 Purkinje fibers, 553 

 Pvcnogonida, 835 

 Pygostyle, 474 

 Pyloric sphincter, 404, 519 

 Pyloric stomach, 368 

 Pyruvic acid, 72 



Quadrate bone, 465 

 Quadrate cartilage 397 

 Quahog, 253 

 Quarternary period, 725 

 Queen ant, 346 

 Quill, 471, 491, 506 



Rabbits, 500 

 Raccoons, 497 

 Radial canal, 174 

 Radiolaria, 159, 832 

 Radius, 512 

 Radula, 244, 246 

 Railroad worm, 77 



Raja, 839 



Ramus communicans, 417 



Rana, 840 



Rana pipiens, 394 



Range, 733 



Range of tolerance, 760 



Raphanobrassica, 710 



Rassenkreis, 727 



Rat fish, 436 



Rathke's pouch, 620 



Rats, 500 



Rattlesnake, 461 



Ray, John, 10, 143 



Ray-finned fishes, 440 

 Rays, 365, 436, 437 

 Reactions, chemical, 64 

 Recapitulation theory, 644, 730 

 Recent epoch, 725 

 Receptors, 103. 574 

 Recessive genes, 654 

 Recovery period, 101 

 Rectum, 521 

 Rectus abdominis, 514 

 Recurrent bronchi, 477 

 Red -backed salamander, 449 

 Red bone marrow, 506, 541 

 Red cells, 58, 539 

 life span of, .541 

 rate of production of, 541 

 Redi, Francesco, 114 

 Redia. 215 

 Reflex, 418, 600 

 conditioned, 589 

 inborn, 589 

 spinal, 588 

 Reflex arc, 588 

 Refractory period, 586 

 Regeneration, 116, 202, 211 



lizard tails, 460 

 Reindeer, 790 

 Relaxation period, 101 

 Relaxin, 628, 634 

 Remora, 442, 443 

 Renal corpuscle, 562 

 Renal pelvis, .562 

 Renal portal system, 546 

 Renal portal veins, 410 

 Renal threshold, 564 

 Rennin, 519 

 Replacement bone, 438 

 Reproduction, 16, 114, 139 

 asexual, 114, 115 

 bird, 483 

 dogfish, 435 

 frog, 452 

 lamprey, 430-431 

 mammalian, 489, 571 

 reptile, 454 

 sexual, 114, 116 

 vertebrate, 566 

 Reproductive ducts. 568 

 Reproductive periodicity, 279 

 Reproductive systems, 122 

 Reptiles, 390, 840 

 adaptations of, 456 

 characteristics of, 453 

 evolution of, 456 

 excretion, 454 

 reproduction, 454 

 respiration, 454 

 skin of, 453 

 Residual air, 534 



