INDEX 



655 



alveolate, 456 ; pectinate, 456 ; pincer- 

 shaped, 466 ; valvate, 456 ; forcipulate, 

 433, 434, 456, 462 ; representatives in 

 Ophiuroidea, 492 ; in Ophiothrix frag- 

 ilis, 492 ; in Ophiohehis, 492, 493 ; of 

 Kchinus acutus, 509 ; of E. esaulenius, 

 506 f., 507 ; tridactyle, 506, 509, 510 ; 

 genimiform, 506, 509, 510 ; trifoliate, 

 508, 509, 510 ; ophicephalous, 508, 509, 

 510 ; function of, 508 f. ; of Bndo- 

 oyolica, 532 ; of Cidaridae, 532 ; of 

 Echinothuriidae, 532, 535 ; of Centro- 

 stephanus longispinosus, 532 ; of Echina- 

 rachnius parma, 544, 545 ; of Echino- 

 cardium cordatum, 550 ; absent in 

 Pelmatozoa, 582 



PedicellasteTf 474 



Pedicellasteridae, 456, 474 



Pegantha, 296 



Peganthidae, ^96 



Pekelharing, 187 n., 234 n., 237 



Pdagia, 311, 312, 315, 316, 32S; P. nocti- 

 teca, 311 ; P. ^erfa, 323; P.phospliora, 

 311, 323 



Pelagic, Foraminifera, 61, 66, 69 ; Eadio- 

 laria, 76 ; Dinoflagellates, 131 



Pelagiidae, SS3 ' 



Pdagohydra, 263, 274 ! P- mirabilis, 274 



Pelagohydridae, 274 



Pelagothuria, 568, 569, 672 ; P. natans, 

 572 



Pelagothuriida, 572, 577, 578 



Pellicle, of Protozoa, 46 ; of Flagellates, 

 109 f., 113; of Noctiluca, 133; of 

 Ciliata, 189, 141, 142 ; of Ooleps, 141, 

 152 ; of Dysteria, 153 ; of Vorticella, 

 157 ; of Suctoria, 159 ; of tentacles of 

 Suotoria, 161 — see also Cuticle 



Pelmatozoa, 430, 579 f. ; pliylogeny of, 

 621 



Pdomyxa, 51 ; P. palustris, 52 f. ; pepsin 

 in, 16 



Penard, on Heliozoa, 71 ; on Ehizopoda, 

 58 n. 



Peneroplis, 69, 66 ; pylomes of, 64 



Peniagone, 572 



Pennaria, 272 



Pennariidae, 272 



Pennatula, 361 ; P. grandis, 361 ; P. 

 murrayi, 359, 362 ; P. naresi, 362 ; P. 

 phosphorea, 338, 361 



Pennatulacea, 333, 335, 337, 368, 358, 

 359, 363 f. 



Pentaceros, 472 



Pentacerotidae, 457, 458, 459, 471 



Pentachogon, 294 



Pentacrinidae, 588, 589, 591 i. 



Pentacrinoidea, 595 



Pentacrinus (Isocrinus), 591 f. ; P. asUria, 

 592 ; P. maelearanus, 593 



Pentagonaster, 471 ; P. japonicus, 472 



Pentagonasteridae, 455, 47i 



Pentremites, 599 



Pepsin, 16 



Peptic, digestion, 16 ; iuice in Carchesium, 

 147 



Peptones, 15 



Perforate, Corals, 371 ; Foraminifera, 5S f. 



Peribolaster, 453, 46S 



Peribranehial spaces of Asterias miens, 

 449 



Pericolpa, 322 



Peridiniales, synonym of Dinoflagellata used 

 by Schutt, 119, 132 



Peridinium, 110 ; fossil, 132 ; P. divergens, 

 131 



Perigonimus, 265, 266, 269 



Perihaemal spaces (or canals), of Asterias 

 miens, 448 ; of Ophiothrix fragilis, 481, 

 488 ; of Echinus esculentus, 524 ; of 

 Holothuria nigra, 566 



Peripatus, segmentation of, 32 n. 



Periphylla, 311, 314, 322; P. regina, 

 322 



Periphyllidae, 310, 322 



Periproct, of Echinus esculentus, 504, 507, 

 512, 513, 534 ; of Endocyclioa, 530, 

 534, 538 ; of Cidaridae, 530, 533, 534 ; 

 of Arbaciidae, 530 ; of Echinothuriidae, 

 535 ; development of, in young Echinoid, 

 613 



Peripylaea ( = Spumellaria), 76 



Perisarc, 251, 263 



Perisiphonia, 277, 280 



Peristalsis of intestine of Holothuria nigra, 

 563 



Peristome, of Ciliata, 137 f. ; in fission, 

 147 ; of Peritrichaceae, 155 f. ; of 

 Vorlicellidae, 155 f., 157; of Asterias 

 ruiens, 434 ; of Echinus esculentus, 

 505, 513, 514 ; of Asteroidea, 514 ; of 

 Cidaridae, 514, 530, 533 ; of Endocyclica 

 530 ; of Echinothuriidae, 535 ; of As- 

 thenosoma hystrix, 537 ; of Saleniidae, 

 537 ; of Arbaciidae, 538 ; of Diadema- 

 tidae, 538 ; of Echinidae, 539 ; oiEchino- 

 cardium cordatum, 550 ; of Spatangoidea, 

 553 ; of Palaeostomatidae, 554 



Peristomial area, 139 ; of Caenomorpha 

 and Metopus, 154 ; of Bursaria, 155 



Peristomial collar, 142, 156, 157 



Peristomial plate, of Opihiothrix fragilis, 

 483 ; of Endocyclica, 530 ; of Cidaridae, 

 530, 533 ; of Echinothuriidae, 530, 535 ; 

 of Saleniidae, 537 ; of Arbaciidae, 538 ; 

 of Echinus mic7vtuberculaius, 540 



Peritoneum, of Asterias rumens, 437 ; of 

 Holothuria nigra, 567 



Peritrichaceae, 1S8 ; pellicle, 141 ; myo- 

 nemes, 142 ; trichocysts, 143 ; contrac- 

 tile vacuole and reservoir, 145 ; pharynx, 

 vestibule, mode of feeding, 145 ; fission, 

 147 ; conjugation, 151 ; peristomial 

 collar, 156, 157 



