INDEX 



655 



alveolate, 456 ; pectinate, 456 ; pincer- 

 shaped, 456 ; valvate, 456 ; ibrcipulate, 

 433, 434, 456, 462 ; representatives in 

 Ophiuroidea, 492 ; in Ophiothrix frag- 

 ilis, 492 ; in Ophiohelus, 492, 493 ; of 

 Echinus acutus, 509 ; of E. esculentus, 

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

 gen uniform, 506, 509, 510 ; trifoliate, 

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

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

 cyclica, 532 ; of Cidaridae, 532 ; of 

 Echiuothnriidae, 532, 535 ; of Centro- 

 stephanus longispinosus, 532 ; of Echina- 

 rachnius parma, 544, 545 ; of Echino- 

 cardium cor datum, 550 ; absent in 

 Pelmatozoa, 582 



Pedicellaster, 4^4 



Pedicellasteridae, 456, 414 



Pegantha, 296 



Peganthidae, 296 



Pekelharing, 187 n., 234 n., 237 



Pelagia, 311, 312, 315, 316, 323; P. nocti- 

 luca, 311 ; P.perla, 323; P.phosphora, 

 311, 323 



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

 laria, 76 ; Dinoiiagellates, 131 



Pelagiidae, 323 



Pelagohydra, 263, 274 '> P- mirabilis, 274 



Pelagohydridae, 274 



Pelagothuria, 568, 569, 572 ; P. natans, 

 572 



Pelagothuriida, 572, 577, 578 



Pellicle, of Protozoa, 46 ; of Flagellates, 

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

 Ciliata, 139, 141, 142 ; of Coleps, 141, 

 152 ; of Dysteria, 153 ; of Vorticella, 

 157 ; of Suctoria, 159 ; of tentacles of 

 Suctoria, 161 see also Cuticle 



Pelmatozoa, 430, 579 f. ; phylo^eny of, 

 621 



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

 in, 16 



Penard, on Heliozoa, 71 ; on Rhizopoda, 

 58 n. 



Peneroplis, 59, 66 ; pylomes of, 64 



Peniagone, 572 



Pnxaaria, 272 



Pennariidae, 272 



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

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

 phosphorea, 338, 361 



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

 359, 363 f. 



Pentaceros, 472 



Pentacerotidae, 457, 458, 459, 471 



Pentachogon, 294 



Pentacrinidae, 588, 589, 591 f. 



Pentacrinoidea, 595 



Pentacrinus {Isocrinus), 591 f. ; P. asteria, 

 592 ; P. maclearanus, 593 



Pentagonaster, 471 ; P. japonicus, 472 



Pentagonasteridae, 455, 4^1 



Pentremites, 599 



Pepsin, 16 



Peptic, digestion, 16 ; juice in Carchesium, 

 147 



Peptones, 15 



Perforate, Corals, 371 ; Foraminifera, 58 f. 



Peribolaster, 453, 463 



Peribranchial spaces of Asterias rubens, 

 449 



Pericolpa, 322 



Peridiniales, synonym of Dinoflagellata used 

 by Schiitt, 119, 132 



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

 131 



Perigonimus, 265, 266, 269 



Perihaemal spaces (or canals), of Asterias 

 rubens, 448 ; of Ophiothrix frag His, 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 escidentus, 504, 507, 

 512, 513, 534 ; of Endocyclica, 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 

 Vorticellidae, 155 f., 157; of Asterias 

 rubens, 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, 637 ; of Saleniidae, 

 537 ; of Arbaciidae, 538 ; of Diadema- 

 tidae, 538 ; of Echinidae, 539 ; of Echino- 

 cardium cordatum, 550 ; of Spatangoidea, 

 553 ; of Palaeostomatidae, 554 



Peristomial area, 139 ; of Oaenotnorpha 

 ami Metopus, 154 ; of Bursaria, 155 



Peristomial collar, 142, 156, 157 



Peristomial plate, of Ophiothrix frag His. 

 483 ; of Endocyclica, 530 ; of Cidaridae. 

 530, 533 ; of Echinothuriidae, 530, 535 ; 

 of Saleniidae, 537 ; of Arbaciidae, 538 ; 

 of Echinus microtuberculatus, 540 



Peritoneum, of Asterias rubens, 437 ; of 

 Holothuria nigra, 567 



Peritrichaceae, 138 ; pellicle, 141 : my<.- 

 nemes, 142; trichocysts, 143; contrac- 

 tile vacuole and reservoir, 145 : pharynx, 

 vestibule, mode of feeding, 145 ; fission, 

 147 : conjugation. 151 : peristomial 

 collar, 156, 157 



