INDEX 



701 



Polyzoa (contd.) — 

 skeleton, 652 

 symbiosis, 615 

 Pomacentridae, 587 

 Pomatoceros, 493, 654, 655 

 P. triqueter, 470, 492, 654 

 Pomatocheles, 663 

 Pomatoleios, 654 

 Pomatomus, 241 



Pontobdella, 247, 283, 443, 444, 596 

 Pontonia, 590 

 Porania, 209, 473 

 porcelain crabs — 

 commensalism, 590 

 See also Poly onyx, Porce liana 

 Porcellana, 228 

 P. longicorm's, 229 

 Porcellio, 149 

 Porichthys, 406, 564, 574 

 P. myriaster, 568 

 P. notatus, 402, 547, 555 

 Porifera — 

 excitation, 416 

 feeding, 205 

 skeleton, 630 

 symbiosis, 612 

 See also sponges 

 Porites, 619 

 P. clavaria, 632 

 porocytes, 205, 376 

 Poromya, 239 

 P. granulata, 240 

 porphyrins, 288, 470 



molluscs, 288 

 porphyropsin, 329 

 porpoise — 

 erythrocyte content, 179 

 feeding, 247 

 hearing, 344 

 See also Phocaena 

 Port Jackson shark. See Heterodontus 

 Portuguese man-o'-war, 255 



See also Physalia 

 Portunion maenadis, 599, 600 

 Port units, 45, 141, 315, 603 

 P. anceps, 514 

 P. depurator, 45 

 P. ordwayi, 514, 515 

 P. spinimanus, 49 

 P. sulcatus, 49 

 Potamilla, 173, 658 

 Potamobius, 273 



Potamopyrgus jenkinsi, 44, 292, 293 

 praniza, 479, 598 

 Praunus, 226 

 P. neglecta, 490 

 pressure — 

 and depth, 22 

 biological effects of, 22 

 pressure receptors, 337 

 pressure sensitivity, 348 

 Priapuhts caitdatus, 88, 124 

 prion. See Pachyptila 



Prionotits, 182, 344, 353 

 P. cawlinus, 179, 186,407 

 P. strigatus, 523 

 Pristis, 300 



Proboscidactyla stellata, 589 

 Procambarus alleni, 340 

 Procerodes, 443 



Procerodes (= Gitnda) itlvae, 41 

 Processa, 323, 470 

 productivity, 203 

 proprioceptors, 336, 337 

 Prorodon, 371 

 Protanthea, 207 

 proteases, 255, 262, 266 

 protective coloration, 493 

 protein-tanning, 641 

 proteolytic enzymes, 255 

 prothrombin, 125 

 protochordates, feeding, 219 

 protoporphyrin, 288, 477 

 Protozoa — 

 carotenoids, 472 

 co-ordination, 416 

 feeding, 204, 236 

 nematocysts, 372 

 osmotic relations, 32, 39 

 skeleton, 630, 635 

 symbiosis, 611 

 trichocysts, 371 

 Protula, 435, 438, 440, 450 

 P. intestinum, All 

 Psammechimis, 156, 663 

 Psammocora, 618, 619 

 Pseudopleitronectes, 525 

 P. americanus, 31, 142, 287, 523, 678 

 pseudopods, 204 

 Pseudoscarus guacamaia, 584 

 Pseudostichopus, 663 

 Pseiidoziits, 405 

 Psoitis, 224, 631 

 Pteria, 479 

 P. hirunda, 111 

 pterines, 282 

 pteropods, 17 



feeding, 214, 239 

 Pterotrachea coronata, 101, 152 

 Ptychodera, 565 

 P. bahamensis, 546 

 puffer fish. See Spheroides 

 puffin — 



feeding, 245, 246 

 submergence-time, 170 

 See also Fratercttla 

 pumping mechanisms, 99 

 pumping rates, 169 

 pupillary movement, 317 

 purine metabolism, 294 

 purines, 282, 288, 294, 482 

 purpurin, 481 

 pycnogonids — 

 blood, 122 

 digestion, 261 

 feeding, 248 



