INDEX 



725 



Phagocytic, 162 

 Phalanx, (ges), 250, 252 

 Phallus, 412, 414, 415, 444 

 Pharyngeal artery, 390 



cleft, 89 



derivatives, 337, 459 



gills, 328, 329, 333 



gill slits, 16 



pouches, 89, 90, 234, 329, 337 

 Pharynx, 7, 8, 10, 11, 12, 19, 20, 21, 89, 



306, 326, 329, 331 

 Phoronida, 9 

 Phosphorescent, 7 

 Phosphorus metabolisrri, 459 

 Photophore, 180 

 Pho'toreceptor, 580, 581, 582 

 Phototropic, 580 

 Phrenic artery, 377, 392 



nerve, 342 



v., 396 

 Phyllopods, 631 

 Phylogenesis, vii, 14, 26 

 Phylogenetic, xv, 621 



series, 666 

 Phylogenetic tree, 2, 5 

 Phylogeny, 66 

 Phylum(a), i, 3, 7, 8, 9, 30 

 Physics, XV 

 Physiological, vii 

 Physostomous fishes, 344 

 Pia mater, 562 



primitiva, 562 

 Pig(s), 189 

 Pigeon "milk," 55 

 Pigment, 176, 177, 178 



cell, 151, 580 



epithelium, 581, 586, 589 



layer (of retina), 589 



spot, 22, 580, 582 

 Pigmentation, 176, 452 

 Pilaster cells, 330 

 PiUar cells, 602 

 Pineal body, 463 

 Pineal eye, 590, 591, 591, 592 



gland, (epiphysis), 490, 495, 507, 590, 



591, 593 



nerve, 590, 591 



organ, 590, 591, 591, 592, 593 

 Pinna, 232, 598 

 Pipa americana, 50 

 Pipe-fish, 47, 57 

 Piriformis m., 283 



Pisces, 24, 31 

 Pisiform, 249 

 Piston, 30s 

 Pit(s), 87 



eyes, 639 



gastric, 310 



organs, 618 

 Pithecanthropus, 32, 33 

 Pituitary gland, 227, 462, 465, 465, 481, 



507, 547 

 Placenta, 27, 49, 54, 57, 80, 120, 121, 376 

 Placental(s), 26, 27, 31, 34, 55, 56 

 Placental mammals, 77, 79 



sharks, 48 



structures, 46 

 Placode, 540, 560, 623 

 Placoid scale, 169, 170, 177, 183, 184, 



185, 332 

 Planarian, 7 

 Planets, xii 

 Plantar artery, 395 

 Plantar v., 397 

 Plantaris m., 283 

 Plantigrade, 28 

 Plasma, 348, 367, 397 

 Plasmodesm(s), 133, 467, 552 

 Plastron, 171 

 Plate, viii, 494, 496, 497, 519, 596 



alar, 542 



basal, 542 



floor, 542, 549 



roof, 542, 549 

 Piatt, Miss Julia, 267, 616, 623, 651 

 Platyhelminths, 4, 7, 30 

 Platypus (duck bill), 41 

 Platyrrhina, 30, 32, 33 

 Platysma, 274 

 Pleistocene, 33, 34 

 Pleura, 340 

 Pleural cavity, 337 



fingers, 651 



folds, 651 

 Pleurodont, 186 

 Pleuroperitoneal cavity, 342 

 Plexus, 470, 473, 532, 533 



of Auerbach, 486, 561 



brachial, 468, 531, 533 



cardiac, 561 



cervical, 468, 486, 489, 532, 533 



cervico-thoracic, 489, 533 



celiac, 561 



chorioid, 490, 547 



