614 



COMPARATIVE ANATOMY 



Parmophorus (Scutum), 5 



Patella, 72 ; nephridia, 218 ; nervous 



system, 138 ; section, 188 

 ,, vulgata, 4 

 Patellidce, 5 

 Patinella, 108 

 Paxillse, 391, 503 

 Pecten, 17 ; eye, 174 

 Jacobeus, 16 

 Pectinibranchia, 5 

 Pectinidce, 16 

 Pectinura, 300 

 Pectunculus, 15 ; eye, 175 

 Pedicellarise, 393-399 

 Pedicellaster, 299 

 Pedicellasteridce, 299 

 Pedina, 290 

 Pedipes, 109 



Pelagothuria natatrix, 285, 286 

 Pelagothuriidce, 285 

 Pelanechinus, 290 

 Pelecypoda, 14 

 Pelmatozoa, 302-315 

 Peltastes, 290 

 Peltella palliolum, 9 

 Peltidce, 10 

 Pen (Ceph.), 69 

 Peneagone, 285 

 Pentaceros, 297 



turritus, oral skeleton, 473 

 Pentacerotidce, 296 

 Pentacrinidce, 313 

 Pentacrinus, 313 



decorus, 377 ; calyx, section, 



382 



Pentactcea, larva, 548 

 Pentcwtula, 516 

 Pentagonaster, 296 



Pentagonasteridas, 296 

 Pentephyllum, 315 



Pentremites, 315, 314 ; ambulacrum, 

 section, 382 ; apical system, 330 ; 

 organisation, 380 



Pentremitidce, 315 



Pentremitidea, 315 



Peradis, 11 



Periechocrinus, 307 



Periostracum, 58 



Periscoechinoidea, 289 



Peristome, 339 



Perna, 17 



Ephippium, shell, 64 



Peronella orbicularis, 424 



Peronia (Moll.), 45 ; (Ech.), 290 



Perradii, 316 



Petalodium, 347 



Petricola, 52 



Petricolidce, 18 



Phcenoschisma, 315 



Phanerozonia, 296 



P/iarus, 51, 115 



Philine, 46 



Philinidce, 10 



Philonexidce, 2% 

 I'l/i/onexis, 24 



,, (Octopus) carence, hectocotylisa- 



tion, 243 

 Pholadacea, 19 

 Pholadidce, 19 

 Pholadidea, 19 

 Pholadomyidce, 51 

 Pholas, 19 



dactylus, valve, 67 

 Phomnosoma, 290 

 Phorus exutus, 5 

 Phragmocone, 68 

 Phyllidiidce, 13 

 Phyllirhoe, genital organs, 238 



bucephaliu/i, 12 

 Phyllirhoidce, 13 

 Phyllobranchidai, 12 

 Phyllodes, 347 

 Phyllophorus, 281 



nrna, 502 



Physa, 8 



foiif/nii/i.f, 8 



Physetocrinus, 307 



Pinna, 17 



Pinnules (Crin.), 371 ; (Blast.), 381 



Pirocystis, 336 



Pisidium, 17 



Pisocrinus, 304 



Phiciibraiirlii'ln . 1 ' 



Placopkorn. .' 



Placuna, 15 



Planaxidw, 8 



Planorbis, #,58 



Plastidogenic organ, 445 



Plastron (Echinoid.), 348 



Plates, included, 340 ; isolated, 340 ; half, 

 340 ; primary, 340 



Platycrinidce, 307 



Platycrinus triacontadactylis, 308 

 tuberosus, tegmeu, 335 



Platydoris, 13 



Plesiocidaroida, 289 



Plesiospatangidce, 293 



Pleuraa, 182 



Pleurobranchcea, 10 



Me.ckelii, genital organs, 



237 



Pleurobra n ch ia, 4 7 



Pleurobranchidce, 10 



Pleurobranchus, 18 



aurantiacus, 10 



Pleuroleuridce, 13 



Pleurophyllidia lineata, 13 



Pleurophyllidiidce, 13 



Pleurotomaria, 5 ; shell, 59, 156 



Pleurotomaridce, 5 



Pleurotomidce, 6 



Pliodon Spekei, 125 



Pluteus, larva, 508, 509, 522 



Plutonaster, 296 



Pneumoderma, 11, 79 

 Pneumodermatidce, 11 



