Subject Index 



851 



Pia mater, 191, 192, 706 



Piciformes, 553 



Pig, 33, 41, 46, 75, 76, 186, 286, 752, 755 



Pigeon(s), 256, 521, 530, 535, 551 



Pigeon milk, 243, 528 



Pigmented epithelium, 201, 203, 204, 205, 



273 

 Pika, 740, 742 

 Pillar cells, 690, 698 

 Piltdown man, 771 

 Pineal body, 148, 227, 710 



eyes, 207 



gland, 149, 215 



organ, 149, 150, 225 

 Pinna(ae), 696, 761 

 Pinnipedia, 747-750 

 Pipa americana, 239 

 Pipe-fish, 55, 238 



Pisces, 409, 410, 416-442 (see also Fishes) 

 Pisiform, 133 



Pithecanthropus erectus, 771 

 Pituitary body, 149 



gland, 224, 225, 226, 227 



anterior lobe of, 224, 225, 226 

 functions of, 226, 227 

 intermediate lobe of, 224, 225 

 posterior lobe of, 224, 225, 226 

 Placenta, 243, 244, 245, 290, 292, 293, 294, 

 295 



cotyledonary, 294 



diffuse, 293 



discoidal, 294 



fetal, 295 



nondeciduate, 294 



zonary, 294 

 Placental reproduction, 643 

 Placentalia (placental mammals), (see 



Placentals) 

 Placentals, 243, 263-266, 646, 653, 657, 

 662, 725, 728, 729, 736-771 



relationships with marsupials, 773-776 



villi, 294 

 Placodermi, 421 

 Placodes, 143, 207 

 Placoid scales, 50, 51, 424 

 Planes, 12 

 Plantar surface, 133 

 Plantigrade condition, 583 

 Plasma, 63, 328 

 Plasmodesm, 305 

 Plate(s), motor, 316 



neural, 186, 254, 258, 262, 268, 271, 

 272, 494, 495 



sclerotic, 476, 533 

 Platybasic skull, 517 

 Platyrhina, 770 

 Platyrhine monkeys, 769 

 Platysma muscles, 98, 100 

 Plesiosaurs, 500 

 Plethodon, 452 



cinereus, 449 

 Plethodontidae, 452 

 Pleura, 22, 620 

 Pleural cavities, 21, 287 

 Pleurocentrum, 111 



Pleurodont, 47, 48, 52 

 Pleuroperitoneal cavity, 21, 287 

 Plexus, 172, 173, 175 



of Auerbach, 174 



brachial, 172, 177 



cervical, 172 



cervicothoracic, 172 



choroid, 147, 148, 151 



gangliated, 174 



lumbar, 172, 177 



lumbosacral, 172 



myenteric, 174 



sacral, 172 

 Plica semilunaris, 686 

 Plicae, 28, 30 

 Plovers, 546 

 Plumes, 507 



Plumules (down-feathers), 507, 510 

 Pluteus, 228 



Pneumaticity of skeleton, 522, 523 

 Pneumogastric (vagus) nerve, 28, 160, 



167, 178 

 Poikilothermous, 410 

 Poison canal, 56 



glands, 55, 56, 155 

 Poison-fangs, 55, 56 

 Polar body, 247, 252 



Pole, animal, 235, 247, 248, 249, 250, 252, 

 254 



vegetal, 247, 248, 249, 250, 252, 254 

 Pollack, lateral-line organs, 165 

 Pollex (thumb), 131, 132, 133 

 Pollock, pelvic fins, 378 

 Polymastism, 580 

 Polymorphonuclear leukocyte, 329 

 Polyphyodont, 54, 55, 635 

 Polyprotodontia, 733 

 Polypterini, 426, 428, 430 

 Polypterus, 276, 421, 426, 429, 430 

 Polythelism, 580 

 Pons Varolii, 148, 151, 713 

 Pontine flexure, 144 

 Porcupine, 740 



African, 741 

 Pores, genital, 237 

 Porpoises, 765 



Postbranchial bodies, 223, 224 

 Postcardinal veins, 64, 71, 73, 74, 78 

 Postcaval vein, 32, 64, 71, 73, 74, 78 

 Post-Darwinian period, 346-353 

 Posterior, 12, 13 

 Postfrontal, 125 

 Postganglionic fibers, 171, 178, 184 



neurons, 182, 219 

 Postorbital, 125 

 Post-trematic nerve, 160, 161, 166, 167, 



169 

 Postzygapophysis(es), 108, 742 

 Pouch (es), marsupial, 238 (see also 

 Marsupium) 



mesodermal, 259, 260, 267, 268, 270 



pharyngeal, 6, 220, 222, 223, 275, 276, 

 299 

 Precardinal veins, 73 

 Precaval veins, 64, 71, 73, 631 



