INDEX 



Pontes, 309 



Porocvtrs, 27S, 276 



Porphvropsin, 107 



Porpoise, 580 



Portal vein, 51 



Portue;uese man-of-war, 303 



Posts;an^lionic fiber, 115, 121 



Potato beetle, 464 



Poultry, orisfin and descent, 636 



Prawns, 440 



Prayine; mantis, 461, 462 



Predator-prey relations, 606, 607; in popula- 

 tions of ciliates, 613 



Prea;ane;l ionic fiber, 115 



Prenatal impressions, 163 



Prenatal infection, 164, 199 



Presoma, of Acanthocephala, 354 



Presumptive areas, 151, 157 



Prevost, 141 



Prickly-pear cactus, 614 



Primary oocyte, 139, 143 



Primary somites, 401 



Primary spermatocyte, 136 



Primates, 580, 585, 586, 587, 638 



Primordial germ cells, 129, 134, 139 



Principle, 5; of adaptive radiation, 393; of the 

 final common path, 100 



Prismatic layer, 377 



Proboscidea, 580 



Proboscis, of Acanthocephala, 354, 355; of 

 elephants, 628, 629; of hemichords, 542, 

 543; of nemertines, 341, 342; of Nereis, 399; 

 of Saccoglossus, 539 



Procercoid, 339 



Procolyla, 317 



Proctodeum, 154 



Procyon, 586 



Progesterone, 123 



Proglottids, of eucestodes, 333 



Pronucleus, 138 



Prophase, 39, 136 



Prorodon, 257 



Prosoma, of chelicerates, 480 



Prostomium, of earthworm, 404 



Protein pool, 30, 78 



Proteinase, 72 



Proteins, 23, 27, 30, 37, 70, 71, 72, 78, 83, 

 197, 618; metabolic turnover of, 78; speci- 

 ficity of, 635 



Protennr, chromosomes of, 42 



Proteoses, 71, 72 



Prothoracic gland, of insects, 456; of silk- 

 worm, 527 



Prothrombin, 32, 64 



Protociliata, 257 



Protonephridia, 518, 520; of Acanthocephala, 

 354, 356; of annelids, 519, 520; of aschel- 

 minths, 519; of Branchiosloma, 519, 552; of 

 entoprocts, 356, 519, 520; of invertebrates, 

 518; of larval mollusks, 519; of nemertines, 



342; of planarians, 318; of platyhclminths, 

 519; of Polyoordius, 418; of rotifers, 346; of 

 tapeworms, 336 



Prolobpalinn, 257 



Proto-organisms, 618 



Protoplasm, 12, 22 



Protopodite, 427, 428 



Proloplems, 558 



Prototheria, 579, 581, 582 



Protozoa, 216, 219, 221, 225, 228 263, 511, 

 619; cellular nature of, 263; colonial types 

 of, 264-268; coordinating mechanisms in, 

 522; cyclosis in, 513; excretion in, 518; re- 

 production in, 530; skeleton of, 527 



Protura, 457, 458 



Pseudo-alleles, 206 



Pseudocoel, 223, 344, 350, 515, 533; of Acan- 

 thocephala, 354, 355 



Pseudocoelomata, 219, 221, 223, 344 



Pseudopodia, 230; of Amoeba, 231-233; of 

 Adasligamoeha, 242 



Psolus, 507 



Psychological isolation, 653 



Pterobranchia, 541, 543 



Pterodactyls, 578 



Ptcropoda, 385, 387 



Pterosaurs, 566, 569, 578, 633 



PteroyI glutamic acid, 33 



Pterygota, 457 



Ptyalin, 71 



Pulmonary arteries, 51 



Pulmonary respiration, 79 



Pulmonary veins, 51 



Pulmonale gastropods, 386, 517 



Pulse wave, 54 



Punnett, R. C, 190 



Pupa, 455; of butterflies, 467; of moth, 468; 

 of potato beetle, 465 



Puparium, of housefly, 476 



Pupil, of eye, 102 



Pure line, 174 



Purkinje, 12 



Pycnogonida, 216, 423, 480 



Pyloric caeca, of starfish, 492 



Pyloric sphincter, 71 



Pyramid of numbers, in food chains, 607 



Pyridoxinc, 33, 76 



Pyruvic acid, 36 



Python, 573; vestigial limbs, 571, 633 



Quadrula, 'Ml 



Quadruplets, 209 



Quahaug, see Venus 



Queen, of ants, 475; of bumblebees, 471; of 



honeybees, 472, 473, 535; of social wasps, 



470; of termites, 458 

 Quinine, 246 



Rabbit, 635; in Australia, 614 

 Raccoon, 580, 586 



701 



