INDEX 



615 



Podocidaris, 

 Podocyst, 258 

 Polian vesicles, 416, 423 

 Polycera, 13 

 Polyplacophora, 2 

 Polytremaria, 5 ; shell, 59, 156 

 Pompholyx solida, 160 

 Porcelainous layer of shell, 57 

 Porcellanaster, 296 

 Porcellanasteridce, 296 

 Pore rhombs (Cyst.), 384 

 Porocrinus, 313 

 Poromya, 51 

 Poromyidce, 21 

 Postpalmars (Grin.), 371 

 Poteriocrinus, 304 

 Pourtalesia, 295 



Jeffreysi, 295 ; apical system, 



325 



Pourtalesiidce, 295 

 Prseputium, 235 

 Prismatic layer of shell, 57 

 Proboscidifera holostomata, 6 



siphonostoviata, 6 



Promachocrinus, 313 

 Proneomenia, 3 



Sluiteri, 3 ; nervous system, 



132 ; sections, 42 



,, vagans, 184 



Proneomeniidce, 3 

 Proostracum, 68 

 Propodium, 106 



Prosobranchia, 4 > gill s > 90 j heart, 199 ; 

 proboscis, 179 ; sections, 110 ; snout, 

 section, 181 ; tentacles, 102 

 Prosoplax, 64 

 Prostata, 233 



Protobranchia, 14 ', gills? 92 

 Protocrinus, 313 



oviformis, 312 



Prunocystis, 332 

 Prymnadetes, 293 

 Prymnodesmia, 293 

 Psam??iobia, 18 

 Psammobiidce, 18 

 PseudarcJiaster, 296 

 Pseudoconch, 47 

 Pseudolamellibranchia, 15 

 Pseudomelanidce, 6 

 Pseudomonocyclic Crinoids, 329 

 Psolus, 287 



ephippifer, 287 

 Psychropotes, 285 



longicauda, 285 



Psychropotidce, 285 

 Pteraster, 298 

 Pterasteridce, 298 

 Pterasterince, 503 

 Pterobranchia, 12 

 Pterocera, 107 

 Pteropoda, 10 ; larva, 257 

 gymnosomata, 11 

 ,, thecosomata, 11 



Pterobrachceidce, 6 

 Pterotrachea, 109 



auditory organ, 168 



,, (Firola] coronata, 7 



Ptyclwdera, 562 



aurantiaca, 585 

 bahamensis, 585 

 clavigera, 570 

 erythrcea, 585 



minuta, 562 ; branchial region, 

 section, 562 ; head region, 

 section, 566, 568 ; co?lom, 

 diagrams, 576 

 Pulmonata, 8, 32 ; eye, 170 ; radula, 183 ; 



renal ducts, diagram, 75 

 Pupa, 8 

 Pupidce, 8 

 Purpura, 101 

 Purpuridce, 6 

 Pygaster, 291 

 Pygurus, 293 

 Pyramidellidce, 6 

 Pyriform vessel (Gastr.), 220 

 Pyrula, 44 



tuba, 73 

 Pythonaster, 298 



RACHIAL teeth, 182 



Rachiglossa, 6 



Radial shields, 362 



Radials, 318 



Radiolitidas, 18 



Radula, 177, 180-183 



Red-brown organ (Keber's organ), 215 



Regulares, 315 



Reptantia, 10 



jRequienia, 18 



Retaster, 298 



Rete mirabile (Hoi.), 452 



Retiocrinidce, 306 



Retiocrinus, 306 



Rhabdopleura, 600-602 



,, Normani, 601 ; section, 



602 



RJutchiglossa, 6 

 Rhinophore, 48, 103 

 Rhipidocrinus, 306 

 Rhipidoglossa, 4 

 Rhizochilus, 183 

 Rhizocrinus, 311 



,. lofotensis, 335 ; axial canals, 



378 ; stone canal, 423 



Raivsoni, 335 



Rhodocrinidce, 306 

 Rhodocrinus, 306 

 Rhodope Veranii, 281 

 Rhopalodina, 287 



derivation of, 408 



Rimula, 43 

 Ringiculidce, 46 

 Rissoidce, 108 

 Rizzolia, 13 

 Rossia, 24 



