INDEX 



657 



Piatt, Julia B. , 011 density of living proto- 

 plasm, 13 n. 



Platybrissus, 554 



Platyctenea, 413, 416, 421 



Platyhelminthes, bladder of, 14 n. 



Plectinia, 193 



Plectoidea, 78 



Plectroninia, 193, 193 ; P. halli, 193 



Plesiofungiidae, 403 



Plesioporitidae, 404 



Pleurobrachia, 4I8 ; P. pileus, 416, 417, 

 418 ; P. rhodopis, 418 



Pleurobrachiidae, 4I8 



Pleurocor allium, 352 



Pleurocoralloides, 352 



Pleurogorgia, 355 



Pleuronema, 137 ; P. chrysalis, 153, 154 



Plexaura, 356 



Plexauridae, 356 



Plimmer and Rose Bradford, on Trypano- 

 soma, 121 



Pliobothrus, 284, 286 



Plocamia, 223 



Pluvwhalichondria, 225 



Plumularia, 279 ; P. echinulata, 276 ; 

 P. halecioides, 276 ; P. profunda, 275 ; 

 P. setacea, 276 



Pluteus, 607 



Pneumatophore, 300 f., 307 f. 



Pneumatopyles, 309 



Pneumotaxy, 23 



Pocillon, 223 



Pocillopora, 375; 402, 402 ; P. septata, 402 



Pocilloporidae, 401 



Podium, 428 ; of Ophiothrix fragilis, 

 479 f., 487 ; of Holothuria nigra, 561 ; 

 of Elasipoda, 571 f. ; of Molpadiida, 

 575 ; of Antedon rosacea, 582 



Podocoryne, 270 



Podocorynidae, 270 



Podoplast, 19 n. see also Blepharoplast 



Podostoma, 52 ; transition between pseudo- 

 podium and flagellum in, 47 n. 



Poecillastra compressa, 213, 222 



Polar body, in Heliozoan syngamy, 72, 74 



Polar fields, 415 



Polian vesicle, of Asteroidea, 458 ; of 

 Ctenodiscus, 458 ; of Solasteridae, 463 ; 

 of Ophiothrix fragilis, 487 ; of Echinus 

 esculentus, 525 ; of Holothuria nigra, 

 566 



Polyaxon, 184 



Polycanna, 278 



Polycystineae ( = Radiolarian skeletons), 

 87 



Polycyttaria ( = colonial Radiolaria), 76, 

 84 f. 



Polvgastrica (Ehrenberg's name for Ciliata), 

 146 



Polykrikos, 110, 113 n., 131 f. 



Polymastia, 224 



Polymastigidae, 111 

 VOL. I 



Polymitus form of male gametogonium 

 of Acystosporidae liberating sperms, 

 104 f. 



Polymorphina, 59 



Polyoeca, 111 ; stalk of, 113 



Polyorchis, 278 



Polyphyes, 307 



Polyphyidae, 307 



Polypodium, 257 



Polyps, 245, 246 ; alternation of genera- 

 tions in, 44. 250 



Polysiphonic, 276 



Polystomella, 59 ; dimorphism and life- 

 history of, 67 f. 



Polythalamia ( = Foraminifera with more 

 than one chamber to shell), 64 



Polytoma, 111 ; brood - division of active, 



115 ; P. uvella, gametes of, 116 n. 

 ' Polytomeae, France on, 119 n. 



Polytrema, 59 ; shell substance of, 62 



Polytremacis, 346 



Polyzoa, 428, 579 ; Entoprocta, 621 



Pontosphaera, 110 



Porania, 455, 464 ; P. pulvillus, 464 



Poraniidae, 464 



Porcellanaster, #71 '> P~ pacificus, 459 ; 

 P. caeruleus, 470 



Porcellanasteridae, 455, 459, 4?0 



Porcellanous Foraminifera, 58, 59, 62 



Pore(s), in test of Foraminifera, 64 ; in 

 central capsule of Radiolaria, 76 ; of 

 contractile vacuole, 14 ; of Ciliata, 143 ; 

 of Trachelitis ovum, 153 ; of embryonic 

 cavity of Sxictoria, not seen in Choano- 

 phrya, 161 n. ; of Sponges, 186, 187. 

 188, 189, 198 



Pore -canal, of Asterias rubens, 441 ; of 

 Ophiothrix fragilis, 486, 487 ; of 

 Echinus escidentus, 517 ; of Echino- 

 cardium cordatum, 552 ; of a larval 

 Holothuroid, 564 ; of Elasipoda, 571 ; 

 of Antedon rosacea, 583 ; of its larva, 

 619 ; of Dipleurula, 608 ; of larva of 



. Aster ina gibbosa, 612 ; of Balanoglossus, 

 617 



Pore-plate, of Echinus esculentus, 512 : of 

 Strongylocentrotus droebachicnsis, 512 ; 

 of Endocyclica, 530 f. ; of petals of 

 Echinarachnius parma, 544 



Pore-rhomb, 597, 598 



Porifera, 163 f. ; definition, 180 ; systematic 

 position, 181 see also Sponges 



Pontes, 368 f., 373, 387, 388, 397 



Poritidae, 396 



Porocone, 81 



Porocyte, 186, 199, 231 



Porosphaera, 193, 282 



Porpita, 309 



Porta, on reproduction of Radiolaria 

 Acantharia, 86 n. 



Porulosa (Holotrypasta), 76 f. 



Portuguese Mau-of-War, 300, 308 

 2 U 



