INDEX 



641 



Prophase, 48, 49 



Proprioceptors, 473 



Propterygium, 367 



Prosoma, 306 



Prostate gland, 162, 163, 186 



Prostomium, 234, 136, 137, 247, 248 



Protective epithelium, 98 



Protective resemblance, 613, 514 



Proteins, 20, 34, 36, 39, 482 



Proterospongia, 80, 129 



Proterospongia haeckeli, 80 



Proterozoic era, 539-541 



Prothorax, 276, 277 



Protista, 41 



Protocercal tail, 355 



Protonephridium, 246, 470 



Protons, 8 



Protophytes, 41 



Protoplasm, 17, 19-24, 28, 41, 85, 457, 488, 546 



Protopterus, tail, 355 



Protopterus annectens, 353 



Prototheria, 429 



Protozoa, 41, 78-87, 576 



symbiotic intestinal, 288 

 Protozoaea, 270, 271 



Protozoans (in general), 41, 63-91, 461-471, 488, 

 489, 494, 495, 497, 508, 516, 522, 524, 525, 

 541, 581 



health in, 516 

 Protozoology, 5 

 Protylopus, 554 

 Proventriculus, 235, 282, 406 

 Psalterium, 438, 441 

 Pseudopodia, 63-66, 78 

 Pseudopodiospores, 68 

 Pseudoscorpions, 308 

 Psychology, 5 

 Ptarmigan, 415 

 Pterodactyls, 410, 543 

 Pterygium, 367 

 Pterygoid, 398 



Ptilosarcus quadrangularis , 149 

 Ptyalin, 327 

 Pubis, 327, 400 



Pulmonary artery, 366, 367, 386, 428 

 Pulmonary chamber, 223 

 Pulmonary vein, 428 

 Pulp cavity, 425, 426, 427 

 Pulsating vacuoles, 64 

 Pulvillus, 279 



Pupa, 280, 284, 286, 291-294, 297 

 Pupal stage, 284 

 Puparium, 292 

 Pupil, eye, 338, 339 

 Purkinje, 19 

 Pus cells, 519 

 Pygostyle, 403 

 Pyloric caeca, 196, 198, 356 

 Pyloric opening, 328 

 Pyloric sac, 198 

 Pyloric valve, 329 

 Pylorus, 198, 489 

 Python, 396 

 Pyura aurantium, 316 



Q 



Quadrate bone, 382, 398, 428 

 Quadrinomial, 572 

 Queen ant, 301 

 Queen bees, 296-298 

 Queen termite, 288 

 Quill, 404, 405 



Rabbit, 437 



brain, 430 



embryo, 548 

 Rabies, 519, 584 

 Raccoon, 433, 436, 445 

 Races, 59 



of men, 452 

 Racial immunity, 519 



Radial canal, 131, 132, 144, 146, 196, 197, 198 

 Radial nerve cord, 196 

 Radial septum, 148 



Radial symmetry, 52, 157, 574. 575, 676 

 Radiata, 203 

 Radiations, 549, 562 

 Radii, 195 



Radiolaria, 83, 540, 541 

 Radiolarian ooze, 83 

 Radius, 326, 327, 367, 400, 404 

 Radula, 223, 226, 229 

 Raja erinacea, 348 

 Rana pipiens, 379 

 Range, 527 

 Rat, 437, 448, 533 



pouched, 535 

 Rattlesnakes, 395 



skull, 398 

 Ray, 571 

 Rays, 340, 345, 347 



echinoderms, 194-199, 201, 204, 205, 206, 209 

 Reactions, 14, 21, 66-67, 72-73, 177, 317, 507 



(See also Responses) 

 Reactiveness, 18 

 Reasoning, 502 

 Recapitulation, law, 271 

 Recent advances, 584 

 Receptor cells, 165, 243 

 Receptor-effector-adjustor mechanism, 496 

 Receptor-effector mechanism, 496 

 Receptor neuron, 243, 244 

 Receptors, 165, 243, 244, 333, 472, 496, 498 

 Recessiveness, 556, 559, 560, 564 

 Recognition colors, 514 

 Rectal caeca, 198 

 Rectal glands, 281 

 Rectum, 328, 329 



Red blood corpuscles, 13, 31, 322, 330, 581 

 Red gland, 355 

 Red marrow, 326 

 Red spider, 308 

 Red-winged blackbird, 609 

 Redi, 26, 583 

 Rediae, 173, 174 

 Reduction, 110-112, 116, 476, 556 



division, 110, 111 



