600 



Premaxillaries, 461 

 Pn-sphenoid, 458 

 Pretrematic, 472 

 Priapuloidea, 281 

 Priapulus, 281 

 Primaries, 534 

 Primates, 573 

 Primordial cranium, 457 

 Priodon, 563 

 Pristis, 507 

 Proboscidea, 570 

 Processus falciformis, 499 

 Precocious, 455 

 Procoracoid, 464 

 Proctodseum, 94, 409 

 Procyon, 565 

 Proechidna, 559 

 Proglottid, 247 

 Progamic develop"ment, iSS 

 Pro-legs, 408 

 Pro morphology, 123 

 Pronephric duct, 487 

 Pronephros, 487 

 Prong horn, 569 

 Pronotum, 404 

 Pronucleus, 133 

 Prosencephalon, 468 

 Proostracum, 341 

 Prorostomus, 570 

 Prootic, 458 

 Propodite, 97 

 Propodium, 325 

 Propterygium, 464 

 Prosimias, 572 

 Prosobranchia, 333 

 Prosopygii, 281, 284 

 Prosternum, 404 

 Prostomium, 270 

 Protamceba, 172 

 Protandry, 108 

 Proteroglypha, 531 

 Prothorax, 404 

 Protobranchiata, 323 

 Protocaris, 366 

 Protocerebrum, 405 

 Protoconchias, 323 

 Protodonta, 559 

 Proteroglyphu , 531 

 Protogynfficy, 108 

 Protohippus, 570 

 Protohydra, 217 

 Protomerite, iS(> 

 Protonemertini, 258 

 Protonephridia, 105 

 Protoplasm, 51, 52 



INDEX 



Protopterus, 513 

 Prototheria, 558 

 Protovertebrse, 467 

 Protozoa, 166 

 Protracheata, 399 

 Protrochula, 238 

 Protula, 278 

 Protura, 419 

 Proventriculus, 409 

 Psalterium, 568 

 Psammonyx, 179 

 Pseudobranch, 502 

 Pseudocoele, 263 

 Pseudocuticula, 528 

 Pseudonavicellae, 187 

 Pseudoneuroptera, 419 

 Pseudopodia, 53, m, 170 

 Pseudoscorpii, 394 

 Pseudosuchia, 532 

 Psittaci, 544 

 Psocidas, 420 

 Psolus, 308 

 Psorosperms, 190 

 Pteranodon, 532 

 Pteraspis, 493 

 Pterichthys, 493 

 Pterodactylia, 532 

 Pteronarcys, 420 

 Pteropoda, 334 

 Pteropus, 565 

 Pterosauria, 532 

 Pterotic, 458 

 Pterotrachea, 334 

 Pterygoid, 461 

 Pterygoquadrate, 460 

 Pterygotus, 388 

 Pterylse, 534 

 Ptyalin, 96 

 Pubic bone, 464 

 Pugettia, 382 

 Pulex, 431 

 Pulmonary artery, 101, 484 



veins, 101, 484 

 Pulmonata, 335 

 Pulp cavity, 451 

 Pulvillus, 431 

 Puma, 565 

 Pupa, 336 

 Pupa coarctata, 416 



libera, 415 



obtecta, 415 

 Pupil of eye, 120 

 Pupipara, 431 

 Purpura, 334 

 Putorius, 565 



Pycnogonida, 399 

 Pygidium, 364 

 Pygostyle, 537 

 Pyloric caeca, 500 

 Pylorus, 481, 554 

 Pyrosoma, 446 

 Python, 531 

 Pythonaster, 298 

 Pythonomorpha, 530 



Quadrate, 461 

 Quadrula, 179 

 Quahog, 324 

 Quail, 543 

 Quill, 533 



Raccoon, 565 

 Racemose glands, 68 



vesicles, 298 

 Races, 20 

 Rachis, 533 

 Radial canals, 211, 292 



chambers, 225 



symmetry, 123 

 Radiale, 465 

 Radialia, 292, 300, 463 

 Radiata, 206, 291 

 Radii, 293 

 Radiolaria, 175 

 Radius, 465 

 Radula, 314, 329 

 Raia, 507 

 Rails, 544 



Rainey's corpuscles, 191 

 Rallus, 544 

 Rana, 520 

 Ranatra, 428 

 Rangifer, 569 



Ranvier, constrictions of, 85 

 Raptores, 544 

 Ratitae, 541 

 Rats, 566 

 Rattlesnake, 531 

 Rays, 507 

 Razor clam, 324 

 Receptaculum seminis, 265, 



413 



Recessive, 138 

 Rectal glands, 409 

 Rectrices, 534 

 Rectum, 409 

 Recurrent typhus, 184 

 Red coral, 230 

 Red mites, 397 

 Redia, 246 



