758 



Plate, lateral, 634 

 muscle, 628 



neural or medullary, 624, 635, 656 

 segmental, 634 

 sense, 635 

 Plates, podical, 230 

 pole, of Amoeba, 34 

 of Paramecium, 51 

 Platybasic, 574 

 Platyhelminthes, 118, 130 

 Platypus, 496 

 Plecoptera, 250 

 Plecotus auritus, 478 

 Pleiotropism, 695 

 Pleura of crayfish, 195 



of cockroach, 228 

 Pleurae of rabbit, 421 

 Pleural cavities, 420 

 Pleurobranchiae, 210 

 Pleuroperitoneal cavity. See 



Coelom 

 Plexus, anterior choroid, 387, 608 

 Auerbach's, 530, 614 

 brachial, 386, 463 

 hepatic, of lancelet, 307 

 lumbosacral, 463 

 Meissner's, 529, 614 

 nephridial, of lancelet, 306 

 posterior choroid, 386, 608 

 sciatic, 386 

 solar, 464 

 sympathetic, 523 

 Podical plates, 230 

 Podobranchia, 210 

 Podomeres, 228 

 Podophrya, 81 

 Polar bodies, 620, 694 

 Polecat, 489 

 Pole capsules, 78 

 cells, 671 

 plates, 34, 51 

 Pollex, 418 

 Polychaeta, 184, 672 

 Poly cells nigra, 132 

 Polygenes, 700 

 Polymorphonuclear cells, 525 

 Polyosca, 83 

 Polyp, 90 



of Obelia, 103 



See also Hydra, Sea-anemones 

 Polyphenol layer, 227 

 Polyphyodont, 322 

 Polypterus, 560, 590, 596 

 Polytoma, 3y, 79 

 syngamy in, 38 

 uvella, 37 

 Pons Varolii, 462 

 Porcupine, 485 



INDEX 



Pore canals, 227 



Pores, abdominal, 312, 322 



dorsal, 160 



of sponges, 82 



spermathecal, 159 

 Porifera, 88 

 Porocytes, 83 

 Porpoise, 487 

 Portal systems, 332 



hepatic, 375, 452, 604 

 renal, 332, 413 

 Portuguese man-of-war, 112 

 Postorbital process, 428 

 Postpatagium, 394 

 Postzygapophyses, 423 

 Pouch, abdominal, of mammals 



494. 497 

 genital, of cockroach, 230 



Prawn, 215, 221 



Preaxial, 437 



Prehallux, 359 



Prementum, 229 



Premunition, 152 



Prepubic process, 406 



Prepuce, 456 



Prepupa, 248 



Presumptive areas, 632, 648 



Prezygapophyses, 422 



Primary body cavity, 189 



Primary remiges, 394 



Primates, 475, 478, 579, 610, 716 



Primitive groove, 633, 637, 648, 



666 



knot, 650 



streak, 633, 648, 666 



Prismatic layer, 266 



Proamnion, 651 



Proboscidea, 491 



Proboscis of insects, 243, 244 



Procerodes litoralis, 132 



Proctodseum, 204, 408, 633, 640, 



656 



Progesterone, 471 



Proglottis, 127, 129, 130 



Prolacerta, 580 



Prolactin, 471 



Prolegs, 255 



Pronation, 437 



Pronephros, 615 



of chick, 657 



of tadpole, 642 



Pronotum, 228 



Pronuclei, male and female, 52, 59 



Propatagium, 394 



Prophase, 688, 694 



Propodite, 197 



Proprioceptive, 612 



Propter^^gium, 321 



