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 

 Pedwellasteridce, 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 



Pentactula, 516 



Pentagonaster, 296 



PentagonasteridcK, 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 



Ephippiwn, shell, 64 



Peronella orbicularis, 424 



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



Perradii, 316 



Petalodium, 347 



Petricola, 52 



Petricolidce, 18 



Phcenoschisma, 315 



Phanerozonia, 296 



Pharus, 51, 115 



Philine, 46 



Philinulce, 10 



Philonexidce, 24 

 Philonexis, 24 



(Octopus) carence, hectocotylisa- 



tion, 243 

 Pholadacea, 19 

 Pholadidce, 19 

 Pholadidea, 19 

 Pholadomyidce, 51 

 Pholas, 19 



dactylus, valve, 67 

 Phormosoma, 290 

 Phorus exutus, 5 

 Phragmocone, 68 

 Phyllidiidce, 13 

 Phyllirhoe, genital organs, 238 



,, bucephalum, 12 



Phyllirhoidce, 13 

 Phyllobranchidce, 12 

 Phyllodes, 347 

 Phyllophorus, 287 



urna, 502 



,, fontinalis, 8 

 Physetocrinus, 307 

 Pinna, 17 



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

 Piracy 'stis, 336 

 Pisidium, 17 

 Pisocrinus, 304 

 Placobranchidce, 12 

 Placophora, 2 

 Placuna, 15 

 Planaxidce, 8 

 PlanorUs, 8, 58 

 Plastidogenic organ, 445 

 Plastron (Ecbinoid.), 348 

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



340 ; primary, 340 

 Platycrinidce, 307 

 Platycrinus triacontadactylis, 308 

 tuberosus, tegmen, 335 



Platydoris, 13 

 Plesiocidaroida, 289 



Plesiospatangidce, 293 



Pleurae, 182 



Pleurobranchcea, 10 



Meckelii, genital organs, 



237 



Pleurdbranchia, 47 



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 



