690 



lyBEX. 



Peripheral nervuus system, 122 



Peripliylla, 250 



Periplancta, 480 



Periproct, 343 



Peripylea, 195 



Perisarc, 233 



Perissodactyla, 640, 641 



Peristome, 209, 343 



Peritoneal cavity, 546 



Peritoneum, 109, 546 



Periwinkle, 380 



Perla, 479 



Perlidae, 479 



Permian, 180 



Perennil)ranchiata, 587 



Peromedusfe, 250 



Perophora, 5 10 



Peropoda, 601 



Perradius, 246 



Petaurus, 634 



Petiole, 485 



Petoscolex, 315 



Petromyzon, 557 



Petromyzon, cleavage of egg, 154 



Petromyzontes, 557 



Petrosal bone, 522 



PhacelliE, 246 



Phoenicopterus, 615 



Phfeodaria, 196 



Phtecjdium, 196 



Pliaethon, 615 



Phagocata, 271 



Phalanges, 529 



Phalangida, 450 



Phalangistidfe, 634 



Phalangium, 451 



Phallusia, 509 



Pharyngeal bones, 560, 576 



Pharyngognathi, 576 



Pharynx, 106, 506, 546 



Pliascalosoma, 316, 317 



Phascolomyidse, 633 



Phascalomys, 633 



Phascolion, 317 



Phasianella, 379 



Phasianida^, 614 



I'liasianus, 614 



Phasmidii;, 4S0 



Phasmomantis, 4S0 



Pheasants, G14 



Phcnacodorj, 639 



Phenacodontidte, 643 



Phidippus, 453 



Philichthys, 38 



Philine, 381 



Philonexiilce, 395 



Phlegethontias, 495 



Phoca, 648 



Phocida:, 648 



PholadidK, 368 



Phoronidea, 325 



Phoronis, 325 



Phoxichilidium, 456 



Phragmocone, 389 



Phronima, 439 



Phryganea, 483 



Phrynicus, 448 



Phrynoidea, 448 



Phrynosoma, 599 



Phrynus, 44S 



Phthirius, 491 



Phylactolaemata, 324 



Phyllium, 48 



Phyllodactylus, 598 



Phyllopoda, 415 



Phyllosoma, 434, 436 



Phyllostomidoe, 638 



Phylloxera, 491 



Phylogeny, 4, 31 



Physalia, 245 



Physeter, 646 



Physiological character of species. 27 



Physiologus, 9 



Physiology, 3 



Physoclisti, 567 



Physonectx, 244 



Physophora, 244 



Physophorae, 244 



Physopoda, 479 



Physostomi, 567, 575 



Phytoflagellata, 202 



Phytophaga, 633 



PicariLi;, 616 



Picas, 639 



Pickerel, 576 



Picus, 6i6 



