536 



INDEX 



Pig, 380 ; skeleton of fore foot, 377. 



Pigeons, 351, 352. 



Pikas, 392. 



Pike, 425. 



Pilidium larva, 118, 119. 



Pineal body, of dogfish, 277 ; of pigeon, 333 ; 



of trout, 288. 

 Pineal eye, 308. 

 Pine marten, 400. 

 Pinnipedia, 404, 435, 448. 

 Pinnulae, of Crinoidea, 88. 

 Pipa americana, 304. 

 Pipe fishes, 296. 

 Pipits, 355- 

 Pisces, 274. 

 Pisiform, 377. 



Pitkecanthropos erectus, 436, 478. 

 Pituitary body, of dogfish, 277 ; of pigeon, 



333; of trout, 288. 

 Pituitary pouch, of lamprey, 273. 

 Placenta, of Mammalia, 362; of rat, 367. 

 Placentalia, 367, 432. 

 Placoid scales, 276. 

 Placophora, 230. 

 Plaice, 293. 



Planarians, same as Turbellaria, q.v. 

 Plankton, 447, 451. 

 Plan obis, 240. 

 Plait: ) bulina, 26. 

 Plantain eaters, 348. 

 Plantigrade, 400. 

 Plant lice, 206, 224, 227. 

 Plasmodium, 14, 34, 36, 217. 

 Plastron, of turtles, 321. 

 Platalea leut orodia, 330. 

 Platydactylus mauritanicus, 314. 

 Platyhelminthes, 105. 

 Platypus, 363. 

 Play, 489-491. 

 Plecoptera, 226, 227. 

 Plcct) ophenax nivalis, 353. 

 Pleistocene period, 13. 

 Pleopods, of Malacostraca, 160, 161, 165. 

 Plesiosaurus macrocephalus, 425, 426. 

 Pleural ganglia, of Mollusca, 229. 

 Pleuron, 147. 



Pleuronectes cynoglossus, 293. 

 Pleurotricha grandis, 48. 

 Pliocene deer, 434. 

 Pliocene period, 13, 443. 

 Pleistocene, 443. 

 Pleistocene birds, 436. 

 Pliny the Elder, 496. 

 Plovers, 351. 

 Plume feathers, 327. 

 Plum weevil, 220. 

 Pluteus larva, 98, 100. 

 Pneumatic duct, of trout, 288. 

 Pneumatophore, 69. 



Podiceps cristatus, 327. 



Podophryafixa, 47, 50. 



Poison glands, of serpents, 308. 



Poisonous serpents, 318. 



Polar bear, 398, 399, 465. 



Polecat, 399. 



Polian vesicles, 86, 87. 



Polistes tcpidus, 225. 



Polyarthra, 127. 



Polycelis, 106. 



Polychaeta, 137, 447. 



Polygordiits, larva of, 138. 



Polygordius neapolitanus, 142. 



Polynoe setosissima, 137. 



Polywca, 42. 



Polyp, definition of, 61. 



Polyzoa, 129, 432. 



Pompano, 292. 



Poplar leaf gall, 208. 



Porcellio scaber, 162. 



Porcula, 380. 



Porcupines, 390, 391. 



Porcyon lotor, 398. 



Porifera, 54, 58. 



Pork tapeworm, 114, 115, 116. 



Porospora, 33, 34. 



Porpoises, 374, 447. 



Porto Santo rabbits, 468. 



Postabdomen, 178. 



Postcaval vein, of pigeon, 333. 



Posterior naris, of frog, 301. 



Post-tertiary deer, 434. 



Post-tertiary fossils, 436. 



Post-tertiary period, 13. 



Potato beetle, 220, 221. 



Potato-stalk weevil, 220. 



Pot er ion, 5b. 



Portuguese man-of-war, 69, 71. 



Portuuus, 171 ; larva of, 172. 



Pouched dog, 367. 



Pouched gopher, 389. 



Pouters, 461. 



Prcecoces, 336. 



Prairie chickens, 350. 



Prairie dogs, 388. 



Prairie hens, 350. 



Prawn, 168, 169. 



Praying mantis, 202. 



Preabdomen, 178. 



Precaval vein, of pigeon, 333. 



Precocious birds, 336. 



Preformation, 498. 



Prehistoric animals, 417. 



Premaxilla, of fowl, 331; of frog, 300; of 



Gadus, 292 ; of pigeon, 333. 

 Priapulus, 143. 

 Primaries, of birds, 328. 

 Primates, 406, 435, 441, 453. 

 Proboscidea, 384, 432, 434. 



