INDEX 



941 



Pisces, 442 



circulatory system, 459 

 class, 411, 445 

 economic relations, 455 

 muscles, 467 

 Pitocin, 678 

 Pitressin, 678 

 Pituitary body of frog, 526 



gland, 672 

 Pituitrin. 674 

 Placenta, 653, 819 

 of armadillo, 622 

 Placoid scales, 422, 427 

 Placula. 807, 809 . 

 Plagioctenium irradiens, pecten, 7/1 

 Planaria, 160, 163 

 metabolism, 170 

 regeneration, 173 

 reproductive system, lbs 

 Plankton, 769 

 Plant lice, 318 

 Plantigrade gait, 641 

 Planula, 128, 134 



larva, 139, 140 

 Plasma, 108, 205, 392 

 of blood, 503 

 membrane, 59, 60 

 Plasmagel, 86 

 Plasmalemma, 86 

 Plasmasol, 86 

 Plasmodium, 79, 745 

 falciparum, 74 

 life cycle, 749 

 malaria parasite, 748 

 malariae, 74 

 vivax, 74 

 Plasmosome, 61 

 Plastron, 578 

 Platyhelminthes, 26, 745 

 economic relations, 174 

 pliylogenetic advances, 174 

 phylum, 160 

 Platyphylax designata, d22 

 Platypodidae, family, 335 

 Plecoptera, order, 265, 321 

 Plectognatlii, suborder, 455 

 Pleopods, 270 

 Plethodon cinereus, 479 



glutinosus, 472 

 Plethodontidae, family, 484 

 Plethodontids, 472 

 Plethopsis wrighti, 485 

 Pleura, 649 

 Pleural ganglion, 245 

 Pleurobrachia bachei, 15 < 

 Pleurobranciiiae, 271 

 Pleurocera, 245, 258 

 Pleurodira, suborder, 547 

 Pleuron, 268. 347 

 Pleuronectidae, family, 452 

 Pleuroperitoneal cavity, 430 

 Pleurum, 306 

 Pliny, 36 

 Pliohippus, 876 

 Plovers, 591 

 Plumatella, 186, 187 

 Pneumatic duct, 463 

 Pneumatophore, 135, 136 

 Podical plates, 348 

 Podobranchiae, 271 

 Podophrya, 72 

 Poduridae, family, 312 

 Poeciliidae, family. 451 

 Poikilothermous condition, 545 

 Polar body, 115 

 ingression. 810 

 "Polian vesicles, m, ^^^ 

 Polistes, 338 



Pollen basket. 357 

 brush, 357 

 combs, 357 

 PoUex, 563, 611 

 Polvaxon spicule, 125 

 Polybia, 338 

 Polychaeta, 194, 196 

 Polycladida, 160 

 Polydactylism, 659 

 Polydactyly, 837 

 Polydesmidae, family, 290 

 Polydon spathula, 448 

 Polygordius, 212, 213 

 Polygyra dorfeuilliana, 240 

 roemeri, 239 

 texasiana, 240 

 Polyhybrid cross, 825 

 Polynemidae, family, 453 

 Polyp, 130. 131 

 Polypide. 184 

 Polypteridae, family. 44fa 

 Polypterus. 446 

 Polypus. 258 



bimaculatus, 257 

 Polystomella crispa. 68 

 Polyzoa. 184 

 Pompano. 454. 7i3 

 Populations. 730 

 Porcellio. 282 

 Porcupine. 622. 625 



fishes. 455 

 Porifera, 26 



phylum, 119 

 Porocyte, 126 

 Porospora gigantea, 59 

 Porpoise, 634 



Portuguese man-of-war, idb 

 Postcaval vein of frog, 508 

 Postorbital crest, toad, o4U 

 Potamobius, 266 

 Potato psyllid, 318 

 Prairie chickens, 590 



dog, 623 . ^ ^^^ 

 Precocial bird, 615 

 Prehallux, 522 

 Prepartoid crest, toad, 540 

 Prepollex. 522 

 Prezygapophyses, 641 

 Prickleback, 321 

 Primates, order, 635 

 Primordial germ cell, lid 

 Pristis pectinatus. 424 

 Proboscidea order 634 

 Proboscis, 161, 164. 179, 197, 362 

 Procellariiformes, order. 587 

 Procyon lotor. coon, hlv, /o5 

 Progesterone. 676 

 Progestin. 676 

 Proglottids, 161. 761. 763 

 Progynon, 676 

 Pronotum. 345 

 Pronuclei, 800 

 Pronucleus, 116 

 Pro-otic bone, 494, 517 

 Prophase, 62, 63 

 Proptera purpurata, 248 

 Propterygium, 430 

 Prorodon, 71 

 Prosobranchiata. ^o8 

 Prosopyles. 124 

 Prosostomata, order, Ibl 

 Prostate gland, 653 

 Prostoma rubrum, 162 

 Prostomium. 197 198, 200 212, 21o 

 Protandrous condition, 245 

 Protease, 384 

 Proteida, suborder. 48o 

 Proteins, 56 



