INDEX 



717 



Protozoa (Cont.) : 



characteristics of, 31 



ciliates, 54-66 



classification, 31, 39, 41, 47, 49, 

 64, 66 



in drinking water, 74 



flagellates, 42-49 



geology, 76 



human, 67 



one-celled, 30-41 



parasitic, 50-53, 64, 67 



relations to man, 67-77 



soil, 75-76 

 Protozoology, 10 

 Protractor muscle, 284 

 Protura, 229, 260 

 Proventriculus, bird, 438 



earthworm, 175 



grasshopper, 235 

 Prunellidae, 462 

 Przewalsky's horse, 619 

 Psephurus, 390 



Pseudocoel, 151, 152, 154, 174 

 Pseudopodia, 32, 33, 34, 71, 107 

 Pseudoscorpionida, 268, 279 

 Psittaciformes, 461 

 Psocoptcra, 263 

 Psolus, 311 

 Psychodidae, 265 

 Psychologic traits, inheritance, 



596 

 Ptarmigan, 461 

 Pteranodon, 427 

 Pterobranchia, 315 

 Pteropods, 293 

 Pterosaurs, 427 

 Pterygoid, 343, 344 

 Pterygoideus, 347 

 Pterylae, 435, 436 

 Ptilogonatidae, 462 

 Ptvalin, 520 



Pubis, 345, 437, 438, 503 

 Puff adder, 416 

 Puffer, 395 

 Puffins, 452, 461 

 Pulmocutaneous arch, 336 



artery, 336, 338 

 Pulmonary, artery, 334, 336, 338, 

 530,^532, 533 



veins, 334, 336, 337, 338, =530, 

 532, 533 

 Pulmonata, 282, 292, 301 

 Pulp, 475 



cavity, 475 

 Pulse, 530 

 Pulvillus, 231, 233 

 Puma, 486 

 Pupa, 244 

 Puparium, 265 

 Pupil, eye, 355, 550 

 Purkinje, 29 

 Pycnogonida, 268, 279 

 Pycnogonum, 279 

 Pygostjle, 436, 437,445 



Pyloric ceca, 307 



duct, 307 



glands, 517 



stomach, 202, 307, 517 

 Pylorus, 331, 515 

 Pyramid, ecologic, 636. 637 



kidney, 539 

 PyTgotci, 256 

 Pyridoxine vitamin, 523 

 Pvriforniis muscle, 347 

 Python, 407, 416, 420, 430 



Quadrate bone, 437 



cartilage, 344 

 Ouadratojugals, 344 

 Quadriceps, 506 



femoris, 505 

 Quadruped, 325, 465 

 Quails, 461 



Quartcnar)' period, 617 

 Queen bee, 251 

 Quetzal, 462 

 Quill, 434, 435 



R 



Rabbit, 464 



fur, 473 

 Raccoon, 485 



Radial canals, 118, 119. 120, 122, 

 305, 307, 309, 310 



nerve, 307 



nerve cords, 306 



symmetry, 88, 102. 308 

 Radiant energy, 512 

 Radiating canals, 55, 58 

 Radiation, 594 



adaptive, 610 

 Radiation genetics. 594 

 Radiolaria, 39,41,76 

 Radiolarian ooze, 76 

 Radioreceptors, 547 

 Radioulna, 343, 346 

 Radius, 437, 501 

 Radula, 289 

 Ragfishes, 395 

 Rails, 452, 461 

 Rajida, 376 

 Rallus, 461 



Rana, 326, 327, 334, 402. 404 

 Ranidae, 397, 404 

 Rat, 485 

 Ratfish, 375 

 Rattles, 418 

 Rattlesnake, 407, 418 

 Ray, 324, 376 

 Rayed fins, 394 

 Reactions to stimuli, 181 



crayfish, 214 



Hvdra, 112 



Reason, 547 

 Receptor, 352, 548 



light, 287 

 Receptor association neuron-effec- 

 tor system, 544 

 Receptor-effector nervous mecha- 

 nism, 544 

 Recessives, 575 

 Rectovesical, 338 

 Rectum, 151, 154, 235, 236. 



515 

 Rectus, 551 



abdominis, 348, 506 



anticus femoris, 347, 348 

 Red blood corpuscle, 335 



bug, 279 



fox, 485 



spider, 275 



tide, 47 

 Red backed salamander, 397. 404 

 Red green color bhndness, 585 

 Redi, 602 



Redia, 159, 140, 142 

 Red tailed hawk, 453 

 Reducers, 635 

 Reduction, chromosome, 578 



division, 574 

 spindle, 578 

 Reduviidae, 263 

 Redwatcr fever, 74 

 Reefs, 124, 126, 127 



barrier, 126 



coral, 126 



fringing, 126, 127 

 Reflex, 179, 544 



arc, 179 



earthworm, 179 

 Regal moth, 264 

 Regeneration, 559, 560 



Amphibia, 399 



autotomy, 560 



compensatory regulation, 560 



crayfish, 213, 559 



earthworm, 180, 182, 559 



heteromorphosis, 559 



Hydra, 116 



invertebrates, 559 



hzards, 559 



Nemertina, 164 



planaria, 136, 138, 559 



salamander, 559 



sea cucumber, 559 



snail, 559 



sponge, 99, 559 



starfish, 559, 560 



vertebrate, 559 

 Reindeer, 479 

 Relapsing fever, 262, 275 

 Relation of body cavities to germ 

 cell layers, 174 



between classes of vertfrbrates, 

 606 



of hearts of vertebrates to res- 

 piration, 339 



