808 



INDEX 



Hsemoccele, 608 : Digestive system, 

 608, 609 : Renal organs, 609 : Heart, 

 609 : Respiration, 609, 610 : Ner- 

 vous system, 610, 611 : Organs of 

 special sense, 611 : Reproductive 

 organs, 611 : Development, 612, 613, 

 614, 615 : Systematic position, 621 

 Periplaneta orientals, 603, 604, 605 

 Periproct, 386* 

 Perisarc, 131, 132, 133 

 Peristaltic movements, 37*, 434 

 Peristome, 94, 97, 98, 185*, 373*, 386* 

 Peristomium, 430*, 444, 460 

 Peritoneum, 445* 

 teritrichous ciliation, 94*, 98 

 Perivisceral cavity, 432* 

 Periwinkles, 663 

 Perlidce, 618 

 Peromedusse, 179 

 Per-radius, 139* 

 Petaloid ambulacra, 413 

 Petasus, 154 

 Petrarca, 551, 565 

 Phacellsu, 171* 

 Phacops fecundus, 589 

 Phteodium, 62, 64 

 Phalangida, 645*, 649, 651, 653 

 Phanerocephala, 454*, 456, 464, 472, 



476 



Pharynx -See Digestive system 

 Phasmidee, 621, 637 

 Pheronema carpenteri, 122, 124 

 Philodina, 321, 324, 327 

 Pholas, 678, 682, 692 

 Phoronida, 333, 348, 353 

 Phoronis, 348, 349, 350, 351, 352 

 Phragmacone, 772* 

 Phragmoceras, 780 

 Phreatoicus, 554 

 Phronima, 571 

 Phrynus, 647 

 Phylactolsemata, 341*, 342, 343, 344, 



345, 346 



Phyllocarida, 552*, 566, 567, 579, 581, 

 586, 587, 588 



Phyllodoce paretti, 468 



Phyllosoma, 585 



Phylogeny, 8* 



Phylum, 5*, 43* 



Physalia, 163, 164 



Physiology, 9* 



Phytoflagellata, 75 



Pieris, 620 



Pigment, 70, 120 



Pilema, 181 



Pilidium, 290 



Pill-bug, 572 



Pinacocytes, 120* 



Pinna, 678, 685 



Pinnotheres, 586 



Pinnules, 398* 



Pionosyllis elegans, 472 



Piscicola, 504, 510 



Placenta, 597 



Placophora, 694*, 697, 698, 699, 701, 

 702 



PLANABIA, 233 : General features, 233, 

 234, 236 : Digestive system, 233, 

 234 : Water vessels, 234, 235 : 

 Nervous system, 234, 235 : Re- 

 productive system, 235, 236 : Syste- 

 matic position, 249 



Planaridce, 249 



Plankton, 8* 



Planocera, 269, 271 



Planorbis, 241 



Planorbulina, 54 



Plant lice, 619, 632 



Planula, 140*, 153, 172, 173, 190 



Plasma, of blood, 30 



Plasmodium, 31*, 68, 69 



Plasmosome, 18* 



Plastin, 17*, 18 



Platyctenea, 218*, 221, 222, 223 



Platyhelminthes, 233, 248* : Ex- 

 amples, 233, 236, 243 : Systematic 

 position, 249 : General external 

 features, 250 : Integument and 

 muscular layers, 257, 259 : Paren- 

 chyma, 259 : Alimentary systems, 



260, 261, 262 : Nervous system, 



261, 262, 263 : Water-vascular 

 system, 263, 264 : Reproductive 

 organs, 264, 265, 266, 267 : De- 

 velopment, 268, 269. 270, 271, 272, 

 273, 274. 275, 276, 277, 278 : 

 Asexual reproduction, 278 : Dis- 

 tribution, occurrence, and relation- 

 ships, 279, 283 : Appendix, 284 



Platypoda, 714*, 715 



Pleopod, 530* 



Pleurobrachia, 208 



Pleurobrachiidce, 218 



Pleurobranchia, 536, 537* 



Pleuron, 528* 



Pleurophyllidia, . 723 



Ploitna, 322*, 323 



Plumatella, 341, 342 



Plumularia, 149 



Pluteus, 392, 403, 422, 423 



Piieumatophore, 160, 161* 



Podia, 370*, 413 



Podical plates, 606* 



Podobranchia, 536, 537* 



Podomere, 514* 



Podophnja, 101, 102 



Podura, 616 



Polar body, 21*, 22 



Polar plates, 213* 



Polian vesicles, 376. 377*, 391, 394, 417 



Pollicipes, 565 



Polyarthra, 322, 323, 331 



Polycelis, 251 



Polychfeta, 454*, 460, 461, 463, 466, 4<57, 



468, 469, 470, 471, 472, 474, 475, 



477 



