472 



INDEX 



Perceptual inference, 171 

 Periophthalmus, 50 

 Peripatus, 248, 252, 327 

 Periwinkle, 261 

 Petromyzon, 271 

 Pets of ants, 88 

 Pfliiger, 351, 400 

 Phalangium, 258 

 Pharynx of lancelet, 270 

 of Tunicates, 269 

 Phasmidse, 57 

 Phenacodus, 293, 343 

 Philosophical evolutionists, 414 

 Phoronis, 242 

 Phoronopsis, 242 

 Photosynthesis, 352 

 Phrynosoma, 282 

 Phyllium, 57 

 Phylogeny, 322 

 Pigeons, 340 

 Pigment of blood, 237 

 Pigments, respiratory, 152 

 Pilot-fish, 73 

 Pi It down skull, 360 

 Pineal body, 282 

 Pinna of ear, 213 

 Pipa americana, 119 

 Placenta, 210, 291, 354 

 Placenta! mammals, 293 

 Planaria, 233 



Planarians, 182, 332, 334, 392 

 Plankton, 27 

 Planorbis, 236, 348 

 Plants and animals, 352 

 - compared, 188 

 Plasmodium, 224 

 Plathelminthes, 233 

 Play of animals, 330 

 Plumage of birds, 392 

 Poikilothermal, 145 

 Poisonous lizard, 282 

 Polar bodies, 309 

 Pollination, 310 

 Polychaata, 240 

 Polyergus, 87 

 Polygordius, 241 

 Polynema natans, 115 

 Polypodium, 230 

 Polyps of precious coral, 231 

 Polypterus, 274 



Polystomum, 235 

 Pontobdella, 242 

 Pontobdella muricata, 273 

 Portuguese Man-of-war, 76, 228 

 Pouch of marsupials, 291 

 Poulton, 53, 54, 57, 59, 60, 65, 



67, 395 



Precious coral, 228, 231 

 Preformation theories, 306, 366 

 Preferential mating, 107 

 Pressures, influence of, 388 

 Preyer, 69 

 Priapulidea, 242 

 Prichard, 400 

 Proboscis of Enteropneusts, 267 



- of Nemerteans, 237 

 Procession caterpillars, 169 

 Proechidna, 291 

 Pro-legs, 255 



Prolonged embryonic life, 328 



infancy, 361 



youth, 329 

 Prophases, 203 

 Prosopis, 83 



Protective resemblance, 57 

 Proteidfood, 150 

 Proteids, 156 



Proteus, 278, 395 

 Protomyxa, 223, 300 

 Protoplasm, 158, 221, 313, 332 

 Protopterus, 274 

 Prototracheata, 251 

 Protozoa, 93, 192, 219, 313, 353 



influence of, on the earth, 223 

 Protozoology, 224 

 Psalterium, 149 

 Psammosphsera, 175 

 Ptarmigan, 129, 394 



-heart of, 215 

 Pterodactyls, 348 



- wing of, 208 

 Pteropods, 223, 260 

 Pterosaurus, 281 

 Ptyalin, 147 

 Ptychodera, 267 

 Puffin, 395 



Punctuation of life, 337 

 Punnett, 374, 376, 428 

 Pupa, 256, 325 

 Pupae, colour of, 53 



