714 



NDEX 



Osmosis, 52, 53 



Ossicles, 212, 272 



Osteichthyes, 279, 291 



Ostium, 212, 213, 225, 226, 258, 318, 319 



Ostracoderm, 287, 289 



Ostrich, 334, 335 



Otolith, 408, 409 



Ovary, 165, 225, 226, 234, 260, 319, 439, 539, 540 



Overspecialization, 666, 667 



Oviducts, 165, 318, 319, 523, 524 



Oviparous, 531, 532, 533 



Ovipositors, 222, 228 



Ovist, 561 



Ovoviviparous, 531, 532, 533 



Ovulation, 318, 319, 541 



Ovum, 165 



Owl, 332 



Oxidation, 520 



Oxnerella, 128, 129 



Oxygen, 475, 485 



Oxygen debt, 399 



Oyster drill, 262 



Pain, referred, 414 



Palate, 336 



Paleocene (epoch), 625 



Paleomonetes, 219 



Paleontology, 16 



Paleozoic (era), 321, 625 



Pallial line, 257 



Palolo worm. See Eunice viridis 



Pancreas, 311, 312, 435, 461, 462 



Pancreatic juice, 462 



Pandorina, 66, 67 



Palps, 224, 232, 233, 256, 258 



Papulae, 269, 270 



Faragonimus westermani, 207 



Paramecium, 109, 114, 374, 375, 383, 384, 530 



Parapods, 186, 187 



Parasite, 97 



Parasitism, 97 



Parasphenoid, 305 



Parasympathetic nervous system, 426, 427 



Parathormone, 444 



Parathyroid, 434, 444 



Parenchyma, 162 



Parietal lobe, 424, 425 



Parotid gland, 455 



Parthenogenesis, 244, 571, 572 



Patella, 376 



Paternal gene, 587 



Pavlov, 459 



Peacock worm, 190 



Pearl, 255 



Pearly layer, 255 



Pecten, 230, 231 



Pectoral girdle, frog, 303, 304 



man, 376, 380 

 Pectoralis, 304, 386 

 Pedal (cerebropedal) ganglion, 259, 260 

 Pedicellariae, 269, 270 

 Pellagra, 471 

 Pellicle, 114, 115 



Pelvic girdle, frog, 303, 304 



man, 376, 380 

 Peneroplis, 128, 129 

 Penicillin, 130 



Penis, 165, 228, 234, 535, 538, 540 

 Pennsylvanian (period), 625 

 Pepsin, 44, 458 

 Pepsinogen, 460 

 Peptide, 464 

 Peptide linkage, 42 

 Peptone, 460, 464 

 Peranema, 123, 124 

 Perca ffavescens, 493 

 Perch, 291, 293 

 Pericardial cavity, 212, 213, 256, 258 



sinus, 226 

 Pericardium, 212 

 Periosteum, 71, 382 

 Periostracum, 255 

 Peripatus, 201, 203 

 Perisarc, 149, 150 

 Perissodactyla, 344 

 Peristalsis, 457, 465 

 Peritoneum, 79, 188 

 Peritricha, 135 

 Periwinkle, 262 

 Permian (period), 321, 625 

 Pernicious anemia, 471, 472 

 Peroneus longus, 304, 386 

 Petrifaction, 627 

 Petromyzon. See Cyclostome 

 pH. See Hydrogen ion 

 Phagocyte, 509 

 Phagocytosis, 509 

 Phalanges, 305, 306, 376, 382 

 Pharynx, 161, 163, 186, 191, 192, 312 

 Phase reversal, 48 

 Phenotype, 588 

 Phenylketonuria, 595 

 Phlebotomus, 125, 126 

 Phoca vitulina, 343 

 Phospholipid, 42 

 Phosphoric acid, 389 

 Photoreceptors, 397, 659, 660 

 Photosynthesis, 41, 93, 94 

 Phrenic nerve, 483 

 Phnjnosoma. See Horned toad 

 PhyUaplysia taylori, 265 

 Phylum, 107 



Physalia, 95, 96, 151, 152 

 Physical world, 21 

 Physiology, 16 



comparative, 640 

 Pill bug, 204 

 Pinna, 403, 405 

 Pithecanthropus, 355, 356 

 Pituitary, 309, 310, 420, 445, 447, 448 

 Placenta, 337, 338, 533, 534 

 Plagiophrys, 127, 128 

 Planaria, 77, 78, 161-166, 162, 163, 164, 165, 166, 



392, 393, 397, 451, 452, 491, 522 

 Plant feeders, 100 

 Plasma, 194, 509 

 Plasmagel, 110 



