INDEX 



657 



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

 plasm, 13 n. 



Platybrissus, B64 



Platyctenea, 413, 416, 4^1 



Platyhelminthes, bladder of, 14, p. 



Plectinia, 193 



Plectoidea, 75 



Plectroninia, 193, 193 ; P. halli, 193 



Plesiofungiidae, 403 



Plesioporitidae, 4O4 



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

 418 ; P. rhodqpis, 418 



Pleurobrachiidae, ^iS 



Pleurocorallium, 35% 



PUv/rocoralloides, 352 



Pleurogorgia, 355 



Pleuronema, 137 ; P. chrysalis, 153, 154 



Plexaura, 356 



Plexauridae, 356 



Plimmer and Eose Bradford, on Trypano- 

 soma, 121 



Pliobothrus, 284, S86 



Plocamia, 223 



Plumohalichondria, 225 



Plumularia, %79 ; P. echinulaia, 276 ; 

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

 P. setacea, 276 



Pluteus, 607 



Pneumatophore, 300 f., 307 f. 



Pneumatopyles, 309 



Pneumotaxy, 23 



PociUoii, 223 



Pocillopora, 375, 403, 402 ; P. septata, 402 



Pocilloporidae, ^Oi 



Podium, 428 ; of Ophiothrix fragilis, 

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

 of Elasipoda, 571 f. ; of Molpadiida, 

 575 ; of Antedon rosacea, 582 



Podocoryne, %70 



Podocorynidae, 270 



Podoplast, 19 n. — see also Blepharoplast 



Podostoma, 52 ; transition between psendo- 

 podium and flagellum in, 47 n. 



Poecillastra compressa, 213, 111 



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, 625 ; of Holothuria nigra, 

 566 



Polyaxon, 184 



Polycanna, 278 



Polycystineae (=Eadiolarian skeletons), 

 87 



Polycyttaria ( = colonial Radiolaria), 76, 

 84 f. 



Polygastrica (Ehrenberg's name for Ciliata), 

 146 



Polyknhos, 110, 113 n., 131 f. 



Polymastia, 224 



Polymastigidae, 111 



VOL. I 



Polymitus form of male gametogoniuni 



, 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 



Polysiphonio, 276 



Polystomella, 59 ; dimorphism and life- 

 history of, 67 f. 



Polythalamia ( = Poraminifera with move 

 than one chamber to shell), 64 



Polytoma, 111 ; brood - division of active, 

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



Polytomeae, France on, 119 n. 



Polytrema, 59 ; shell substance of, 62 



Polytremacis, S46 



Polyzoa, 428, 579 ; Entoprocta, 621 



Pontosphaera, 110 



Porania, 455, 4(>4- '> -P- pulvillus, 464 



Poraniidae, 464 



Porcdlanaster, 47 i ', P- pacificus, 459 ; 

 P. caerideus, 470 



Porcellanasteridae, 455, 459, 470 



Porcellanous Poraminifera, 58, 59, 62 



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

 central capsule of Radiolaria, 76 ; of 

 contractile vacuole, 14 ; of Ciliata, 143 ; 

 of Trachdius ovum, 153 ; of embryonic 

 cavity of Suotoria, not seen in Ohoano- 

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

 188, 189, 198 



Pore -canal, of Astcrias rubens, 441 ; of 

 Ophiothrix fragilis, 486, 487 ; of 

 Echinus esculentus, 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 

 Asterina gibbosa, 612 ; of Balanoglossus, 

 617 



Pore-plate, of Echinus esculentus, 512 ; of 

 Strongylocentrotus droebachiensis, 512 ; 

 of Endocyolica, 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, 28S 



Porpita, 309 



Porta, on reproduction of Eadiolaria 

 Aoantharia, 86 n. 



Porulosa (Holotrypasta), 76 f. 



Portuguese Man-of-War, 300, 308 

 2 V 



