INDEX 



715 



Perca flavescens (Cont.) : 



respiratory system, 383 



sense organs, 384 



skeleton, 380, 381 



structure, 382 

 Perch, 378-385, 379, 388, 395 



( see Perca flavescens ) 

 Perching birds, 446, 456, 462 

 Percidae, 379 

 Percoid, 379 

 Percomorphid, 379 

 Percomorphida, 395 

 Peregrine, 451 

 Pereiopod, 205 

 Pericardial sinus, 202 

 Pericardium, 330 

 Peridinium, 74 

 Perihemal canal, 307 

 Periodicity, ecologic, 644 

 Periostracum, 283, 284 

 Peripatus, 111, 223, 224 

 Peripharyngeal groove, 318 

 Peripheral nervous system, 178, 



350,352 

 Perisarc, 118, 119 

 Perissodactyla, 464, 484, 496 

 Peristalsis, 177, 517 

 Peristomium, 183, 184 



tentacles, 184 

 Peritoneum, 173, 174,518 

 Peritricha, 66 

 Periwinkle, 292 

 Permian period, 617 

 Pernicious anemia, 533 

 Peroneal artery, 338 

 Peroneus, 347', 350, 505 

 Petrels, 461 

 Petromyzon, 360-367 

 Petromyzontia, 360, 366 

 Phacus, 46, 49 

 Phagocytosis, 33 

 Phalaenidae, 264 

 Phalanges, 343, 346, 437, 474, 



501 

 Phalangida, 268, 279 

 Pharyngeal chamber, 137 



groove, 318 



muscle, 172 



sac 321 

 Pharynx, 130, 131, 137, 140, 151. 

 164, 172, 190, 319 



man, 515, 517, 549 

 Phascolarctus, 495 

 Phase contrast microscope, 654 

 Phasmatida, 263 

 Pheasant, 433,446, 453, 461 

 Phenotype, 578, 579 

 Philodina, 165, 166 

 Phlebotomus, 71 

 Phoebe, 456 

 Pholcidae, 278 

 Pholcus, 278 

 Pholidota, 464, 482, 496 

 Phoronidea, 168 



Phoronis, 168 

 Phosphorus, 518 

 Photoreceptor, 179 



cells, 180 

 Photosynthesis, 509-510 

 Phryganea, 264 

 Phrvnosoma, 415 

 Phyla, 3 



synopsis, of, 3-4 

 Phxllocoptes, 279 

 Phyllopteryx, 391 

 Phvlloxcridac, 264 

 Phylloxcrids, 264 

 Phylogcny, 10,613 

 Physalia, 120, 127 



dactylozooid, 120 



dimorphic, 120 



gastrozooid, 120 



gonozooid, 120 



nematocysts, 121 



pneumatophore, 120 



polymorphic, 120 



Portuguese man-of-war, 120, 

 121 

 Physeter, 480, 496 

 Physiochemical theory of origin of 



life, 603 

 Physiologic condition, 112, 114, 

 183 



traits, 596 

 Physiology, 10 



muscular contraction, 507 

 chemical reactions, 508 

 Phytomastigina, 47 

 Phytomonadina, 42, 49, 561 

 Piamater, 354 

 Piciformes, 462 

 Pickerel frog, 402 

 Piculets, 462 

 Pied-billed grebe, 461 

 Pieridae, 265 

 Pieris, 240 

 Pig, 485, 487 

 Pigeon, 432-443, 456, 461 



circulatory system, 439, 440 



digestive system, 438 



excretory system, 441 



external features, 432 



feathers, 434, 435 



internal structure, 434 



locomotion, 435 



muscular system, 438 



nervous system, 442 



reproductive system, 442 



respiratory system, 439, 441 



sense organs, 442 



skeleton, 435. 437 

 Pigeon's milk, 443 

 Pigment, cell, 138, 328, 398 



fish, 388 



granules, 138, 327 



honeybee eye, 233 



insect, 249 



man, 579 



Pigment (Cont.) : 



Siamese cats, 589 

 Pika, 496 

 Pike, 394 



Piltdown man, 626 

 Pincer, crayfish, 201 

 Pinctada, 300, 301 

 Pineal body, 350,351,553 

 Pinguinus, 452 

 Pinna, 548 

 Pinnule, 311 

 Pinworm, 157, 158 



embryo, 1 57 

 Pipefish', 393, 395 

 Pipidae, 397 

 Piping plover, 449 

 Pisauridae, 278 

 Pisaurina, 278 

 Pisces, 378-395 



{see Fish) 

 Pisidium, 301 

 Pit, 417 



organ, 425 



vipers, 425 

 Pithecanthropus. 624, 625 

 Pituitary, 351, 552, 553 



bodv, 546 



dwarf. 554 



giant, 554 



gland, 350, 364, 398, 553 

 Pituitrin, 553 

 Pivotal joints, 503 

 Placenta, 473, 553 

 Placohdella, 191 

 Placodcrm, 317,616 

 Placoid scale, 368, 370 

 Plaice, 394 



Planaria, 134-138, 135, 136, 137, 

 138,607 



axial gradients, 1 36 



bilateral symmetry, 1 34 



cilia, 1 34 ' 



circulation, 136 



digestive system, 154, 135 



excretory system, 135, 136, 139 



eye, 135,156, 138 



flame cell, 135, 136, 139 



genital pore, 134, 135 



mesoderm, 134 



mouth, 134, 135 



muscular system, 1 36 



nervous system, 135, 156, 159 



parenchyma, 134 



pharynx, 134, 135 



pharyngeal, chamber, 135 

 region, 137 



regeneration, 136, 138 



reproduction, 36, 139 

 Plankton, 645, 646 

 Plant lice, 260, 264 

 Plantigrade, 475, 476 

 Planula, 118, 122,607 



stage in life cycle, 603 



