Index 



717 



Paramecium, 368-372 



classification, 352 



conjugation, 253 



cytoplasmic inheritance in, 315 

 Paramylum, 354 

 Paiapodium, 451 

 Parasitic insects, 531 

 Parasitism, 350, 351 



adaptations to, 420-421 

 Parasitology, 21 

 Parasphenoid bone, 56 

 Parasympathetic nervous system, 194, 



206, 207 

 Parathormone, 231, 232 

 Parathyroid gland, 231-233 

 Parathyrotropic hormone, 246 

 Parazoa, 346, 375 

 Parenchyma, 402, 405, 421 

 Parental care, 254, 628 



generation, 299 

 Parietal bone, 102 



lobe of cerebrum, 197 



mesoderm, 282 



peritoneum, 60, 448 

 Parrot, 625 



Parthenogenesis, 253-254 

 Parturition, 79, 110, 116, 242, 262, 292 

 Passeriformes, 625 

 Pasteur, 319 

 Patella, 111, 512 

 Pathology, 21 

 Pauropoda, 490, 515 

 Pauropos, 490 

 Pavlov, 141, 210 



pouch, 141 

 Peacock worm (see Sabella), 454 

 Peanut worm (see Sipunculoidea), 



348, 462-465 

 Pearl, 477 

 Peas, inheritance in, 297, 298, 299, 303, 



304 

 Pecten, 471, 476, 548 

 Pectinatella, 482 

 Pectoral girdle of frog, 58 



of human being, 109 

 Pedal disc of Metridium, 396 

 Pedicellaria, 542, 545, 547, 550 

 Pedicellina, 442 

 Pediculati, 590 

 Pedipalpi, 514, 515 

 Peduncle, 511 

 Pelecaniformes, 625 

 Pelecypoda, 468, 471-477 

 Pelican, 618, 619, 624, 625 

 Pellagra, 146 

 Pellicle, 353, 368 

 Pelmatohydra, 386 

 Pelobatidae, 596 

 Pelvic girdle, 110 



vein, 68 ... 



Pelvis of kidney, 188 

 Pelycosauria, 604, 626 

 Pen of squid, 479 

 Penaeus, 507, 508 

 Penetrant, 385 

 Penguin, 620, 625 

 Penis, 258 



bone. 111 

 Pentastomida, 489, 515 

 Pepsin, 138 

 Peranema, 358 

 Perca, 84, 197, 583-586 



classification, 46, 567, 582, 590 



economic importance, 588 

 Perch (see Perca) 

 Percomorphi, 590 

 Pericardium, 60, 63, 162 

 Perilymph, 222 

 Period, contraction, 124 



latent, 124 



menstrual cycle, 262, 263 



refractory, 124, 173 



relaxation, 124 

 Periodic table, 25-26 

 Periophthalmus, 592, 593 

 Periosteum, 96, 117 

 Periostracum, 472 

 Peripatus, 489, 490-492 

 Peripheral nervous system, 69, 71, 



203-205 

 Perisarc, 391 



Perissodactyla, 630, 639-640 

 Peristalsis, 142, 563 

 Peristomium, 450, 455 

 Peritoneum, 60, 128, 448 

 Periwinkle (see Littorina), 476 

 Permafrost, 653 



Permian period, 343, 568, 613, 626 

 Peromyscus, 632, 636 

 Perradius, 395 

 Perrin, 33 



Perspiration (see Sweat) 

 Petrel, 625 



Petromyzon, 567, 571-574 

 Petromyzontia, 571 

 pH, 30 



Phalanges, 56, 58. 109, 110 

 Pharyngeal crossover, 131 



region, 148 

 Pharynx, 53, 61, 131. 149, 151 

 Phases of mitosis, 270-272 

 Pheasant, 618. 619, 623, 625 

 Phenotype, 299 

 Phenotvpic ratio, 299 

 Philodina, 440-441 

 Phocaena, 630 

 Pholidota, 630, 635 

 Phoronida. 348, 484, 485 

 Phoronis, 482 

 Phosphates, organic, 120, 121 



