432 



INDEX. 



Pentacrinus, 280 

 Perch, 332 



Pericardial cavity, 18, 26 

 Pericardium, 195, 310 

 Perisarc, 123, 165 

 Perissodactyla, 383 

 Peristome, 115 

 Peritoneal cavity, 54, 368 

 Peritoneum, 17, 25, 307 

 Permanent dentition, 367 

 Permian period, 413 

 Petromyzon, 316 

 Phalangers, 371 

 Phalanges, 297 

 Phalangida, 234 

 Phalangium, 234 

 Pharyngognathi, 332 

 Pharynx, 24, 305 

 Pheasants, 357 

 Phyllopoda, 222 

 Phylloxera, 260 

 Physalia, 168 

 Physiology, 395 

 Physostomi, 327 

 Pickerel, 328 

 Picrosulphuric acid, 9 

 Pigeons, 360 

 Pigs, 385 

 Pike, 328 

 Pill-bug, 229 

 Pinnipedia, 388, 389 

 Pinworms, 182 

 Pipa, 341 

 Pipe-fish, 334 

 Pisces, 317 

 Pituitary body, 37 

 Placenta, 372 

 Placentalia, 372 

 Placoid scale, 17, 318 

 Planaria, 179 

 Plantigrade, 388 

 Plant-lice, 260 

 Plants and animals, 137 

 Plasma, 314 

 Plasmodium, 151 

 Plastron, 44, 348 

 Plathelminthes, 178 

 Plectognathi, 333 

 Pleistocene period, 414 



Plesiosaurs, 349 

 Plethodon, 340 

 Pleura! cavity, 57, 368 

 Pleurobranchise, 19 

 Plexus of nerves, 36 

 Pliocene period, 414 

 Ploughshare-bone, 353 

 Pneumogastric nerve, 59, 300 

 Pocket-rats, 376 

 Podobranchise, C9 

 Poison-fangs, 3-J7 

 Polian vesicles, 113 

 Polychsetse, 185 

 Polymorphism, 407 

 Polyphemus-moth, 265 

 Polyps, 171 

 Polyzoa, 189 

 Pom pa no, 331 

 Porcupines, 375 

 Porgy, 332 

 Porifera, 158 

 Porpoise, 379 

 Portal vein, 55 

 Portuguese man-of-war, 168 

 Postcava, 56 

 Potato-beetle, 241 

 Poulpes, 212 

 Prrccoces, 353 

 Prairie-dogs, 376 

 Prawns, 227 

 Precava, 58 



Premaxillary bone, 24, 39 

 Premolars, 367 

 Preoral lobe, 92 

 Primary feathers, 48 

 Primates, 390 

 Pristis, 323 

 Proboscidia, 381 

 Proboscis, 123, 127 

 Process, hsemal, 27 

 Process, neural, 27 

 Process, transverse, 37 

 Proccelous, 292 

 Proglottid, 181 

 Prometheus-moth, 265 

 Prootic bone, 39 

 Prosencephalon, 299 

 Prothorax, 77, 237 

 Protoplasm, 126, 139 



