INDEX 



r):]9 



Phylogenetic advances of Annelida, 357 



development of horse, 492 



relations, 480 

 Phylogeny, 21, 225, 414, 487 

 Phyrone, 201, 206 

 Physa gyrina, 380 

 Physalia, 307, 308 



Physiologic evidence of evolution, 505 

 Physiology, 21, 166 

 Pia mater, 90, 92, 133 

 Pigworm, 335 

 Pilidium, 324 

 Pill bug, 394, 411 

 Pineal organ, 90 

 Pinna, 108 

 Pinworm, 335 

 Pisaster, 362 

 Pisces, 148 



Pithecanthropus skull, 494, 496 

 Pituitary gland, 91, 201, 206 

 Pituitrin, 202 

 Placenta, 143, 223 

 Placentalia, 487 

 Planaria, 23, 323 



reproduction, 329 

 Plantigrade, 109 

 Planula, 306, 307 

 Plasma, 57, 70, 129, 350 



membrane, 48 

 Plasmalemma, 287 

 Plasmasol, 287 

 Plasmodium, 275, 280, 441 



falciparum, 276 



malariae, 276 



vivax, 276 

 Plasmogel, 287 

 Plasmosomes, 49 

 Platyhelminthes, 23 



phylogenetic advances, 334 



phylum, 323 

 Pleopods, 397 

 Plethodontids, 64 

 Pleural ganglia 388 



genes, 242 

 Pleurobranchial, 400 

 Pleurocera, 388 

 Pleuron, 397, 420 

 Plexus, cervical, 139 



lumbar, 139 



sacral, 139 



sciatic, 139 

 Pliny, 31 



Pliocene epoch, 498 

 Pliohippus, 492 

 Pneumatophore, 308 

 Podical plates, 421 

 Podobranchial, 400 

 Podophyra, 274 

 Polar body, 210 

 Polychaeta, 344 



!3 



Polycladida, 32.' 



Polydactyly, 229 



Polygordius, 355 



Polygyra, 381 



Polyhybrid cross, 240 



Polyp, 303 



Polypus, 373 



Pons, 134 



Population, seasonal changes, 470 



Populations, animal 468 



Porcellio, 411 



Porifera, 22 



Porospora gigantea, 47 



Portuguese man-of-war, 307, 308 



Postcava, 74 



of rat, 129 

 Potomobius, 395 

 Precipitation effectivity, 460 

 Prepuce, 109, 143 

 Presphenoid, 110 

 Primrose, evening, 508 

 Proboscis, 148, 324, 325, 327, 337 

 Progeny, 240 

 Progesterone, 205, 207 

 Proglottids, 324, 454 

 Prolan, 202, 206 

 Pronator, 116 

 Pronephros, 222 

 Pronghorn, 464 

 Pronotum, 420 

 Pronucleus, 211 

 Prophase, 50 

 Proptera, 374 

 Prosencephalon, 218 

 Prostate gland, 145 

 Prostomiuin, 344, 345 

 Prostonia, 324 

 Protandrous condition, 388 

 Proteases, 169 

 Proteins, 45 

 Prothorax, 420 

 Protochordata, 148 

 Protogynous condition, 388 

 Protoneurones, 181 

 Protoplasm and cell, 39 



characteristics of, 41 



chemical nature, 44 



physical nature, 43 



properties of, 42 

 Protopodite, 397 

 Prototracheata, 395 

 Protozoa, 22 



colonial, 277 



economic relations, 279 



in general 268 



representative, 275 

 Protractor, 116 

 Prozoea, 414 

 Pseudopodia, 287, 292 

 Pseudopodiospore, 291 



