INDEX 



657 



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

 plasm, 13 n. 

 Plati/brissus, 554 

 Platj'cteuea, 413, 416, 4^^ 

 Platyhelniinthes, bladder of, 14 n. 

 Pledinia, 193 

 Plectoidea, ?.V 



Plectnminia, 193, 193 ; /'. hedli, 193 

 Plesiofuugiidae, 4^)3 

 Plesioporitidae, 4<^'4 

 Pleurobmchia, 4IS ; P. jnleiis, 416, 417, 



418 ; P. rhodojjis, 418 

 Pleurobrachiidae, ^i6" 

 PleurocoraUmni, 352 

 Pleurocoralloides, 352 

 Pleurogorgia, 355 



Pleuronema, 137 ; P. chri/salis, 153, 154 

 Plexaura, 356 

 Plexauridae, 356 

 Plimmer and Rose Bradford, on Trypano- 



soma, 121 

 Pliobothrus, 284, ;2S6 

 Plocamia, 223 

 Plumohalichondria, 225 

 Plumularia, 279 ; P. echinulata, 276 ; 

 P. halecioides, 276 ; P. ])rofunda, 275 ; 

 P. setacea, 276 

 Pluteus, 607 



Pueumatopbore, 300 f., 307 f. 

 Pneumatopyles, 309 

 Pneumotaxy, 23 

 Podllon, 223 



Pocdlopom, 375, 402, 402 ; P. septata, 402 

 Pocilloporidae, 4^1 



Podium, 42S ; of Ophiothrix fragilis, 

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

 of Elasipoda, 571 f. ; of Molpadiida, 

 575 ; oi Antedon rosacea, 582 

 Podocoryne, 270 

 Podocorynidae, 270 



Podoplast, 19 n. — see also Blepharoplast 

 Podostoma, 52 ; transition between pseudo- 

 podium and tlagellum in, 47 n. 

 PoecUlastra 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 Ojjhiothrix fragilis, 487 : of Echinus 

 esculentus, 525 ; of Ildiotliuria nigra, 

 566 

 Polyaxon, 184 

 Polycanna, 27 S 

 Polycystineae (^Radiolarian skeletons), 



87 

 Polycyttaria (= colonial Radiolaria), 76, 



84 f. 

 Polygastrica (Ehrenberg's name for Ciliata), 



146 

 Polykrikos, 110. 113 u., 131 f. 

 Polymastia, 224 

 Polymastigidae, 111 

 YOL. I 



Polyniiti's form of male gametogoniuni 

 of Acvstosporidae liberating sperms, 

 104 f. 



Polymorphina, 59 



Poh/oeca, 111 ; stalk of, 113 



I'oh,orchis, 27 S 



Pnl,iplnj,'s. .:.V/7 



Polvpliviilac, .:o7 



Pobjpn'dinm, 257 



Polyps, 245, 246 ; alternation of genera- 

 tions in, 44, 250 



Polysiphonic, 276 



Polystomella, 59 ; diinorpliism and life- 

 liistory of, 67 f. 



Polythalamia ( = Foraminifera with more 

 than one chamber to shell), 04 



Polytoma, 111 ; Ijrood - division of active. 

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



Polytomeae, France on, 119 n. 



Polytrema, 59 ; shell substance of, 02 



Polytremacis, 346 



Polyzoa, 428, 579 ; Eutoprocta, 621 



Pontosphaera, 110 



Porania, 455, 464 ; P. pidvillus, 464 



Poraniidae, 464 



Porcellanaster, 471 ; P- pacijicus, 459 ; 

 P. caeruleus, 470 



Porcellanasteridae, 455, 459, 470 



Porcellanous Foraminifera, 5S, 59, 62 



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

 central capsule of Radiolaria, 76 ; of 

 contractile vacuole, 14 : of Ciliata, 143 ; 

 of Trachelius ovum, 153 ; of embryonic 

 cavity of Suctoria, not seen in Choano- 

 phrya, 161 11. ; of Sponges, 186. 187. 

 188, 189, 198 



Pore -canal, of Asterias rube as, 441 ; of 

 Ophinthrix fragilis, 486, 487 ; of 

 Echinus escule7itus, 517 ; of Echino- 

 ccrdium cordatum, 552 ; of a larval 

 Holothuroid, 564 ; of Elasipoda, 571 ; 

 of Antedon rosacea, 583 ; of its larva, 

 619; of Dipleurula, 608; of larva of 

 Asterinagihbosa, 612 ; of Balanoglossus, 

 617 



Pore-plate, of Echinus esculentus, 512 : of 

 Sfrongylocentrotus divebachiensis, 512 ; 

 of Endocyclica, 530 f. ; of petals of 

 Echiyiarachnius 2Mrma, 544 



Pore-rhomb, 597, 598 



Porifera, 163 f. ; definition, 180 ; systematic 

 jiosition, 181 — see also Sponges 



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



Poritidae, 396 



Porocone, 81 



Porocyte, 186, 199, 231 



Porosphaera, 193, 2S2 



Porpita, 309 



Porta, on reproduction of Radiolaria 

 Acantharia, 86 n. 



Porulosa (Holotrypasta), 76 f. 



Portuguese Man-of-War, 300, 308 

 2 U 



