INDEX 



613 



Olividce, 6 



Ollacrimts (see Gilbertsocrinus) 



Ouimastrephes, 24 ', gonad, female, 230 ; 



shell, sectiou, 69 

 Ommatophore, 102 



Ommatostrephes, 24 ; nervous system, 148 

 Oncididla, 46 

 Onci'Uidce, 8 

 0/ici'Uum, 44, 104 



celticum, genital organs, 235 ; 



larva, 256 



Oneirophanta mutabilis, rod, 237 

 Onychoteuthis, 24 

 Operculum, 31 

 Ophiamntha, 300 



,, marsupialis, 495 ; vivipara, 



495 

 Ophiactis, 300 



MiUleri, 506 

 poa, 300 

 Savigny, 506 

 virens, 498 ; disc, section, 426 

 Ophiarachna incrassata, vertebral ossicles, 



356 



Ophidiaster Germani, 421 

 Ophi'.'ceramis, 327 

 Ophiocnida, 300 



sexradia,, 506 



Ophiocoma, 300 



pumila, 506 

 Valencia, 506 ; 

 Ophiocreas, 301 

 Ophioderma ( = 0phiura), 495 

 Ophiodiaster, 298 



diplax* regeneration of arms, 



505 

 Ophioglypfui, 300 ; bursa, 495, 496 ; disc, 



section, 497 



albida, stomach, 494 



hexactis, 495 



lacertosa, ovary, section, 497 



Ophioglyphidce, 300 

 Ophiohehis umbella, arm joint, 357 

 Ophiomastix, 327 

 Ophiomitra exigua, 327 

 Ophiomusium, 300 



ralidum, apical system, 327 



Ophiomyxa, 300 



I'ii-ipara, 495 



Op/iiumyxidce, 300 

 Ophiontreis, 422 

 Ophwplocus, 422 



Ophiopteron elegans, brachial joints, 391 

 Ophiopya longispinus, oral skeleton, 359 

 Op h iopyrgus, 327 

 Ophiothela dividiia, 506 

 isidicola, 506 

 Ophiotholia, 392 

 Ophiothrix, 300 



fragilis, ambulacral tentacle, 

 section, 466 ; nervous sys- 

 tem, 456 

 Ophwzona, 300 



VOL. II 



Ophiura, 300 

 Ophiurce, 300 

 Ophiuroidea, 299-301 ; arm, section, 412 ; 



arm, joint, 357 ; disc, section, 486 ; 



Pluteus, 533 ; nervous system, 456 ; 



ring sinus, 496 



Opisthobranchia, 10, 33 ; heart, 199 

 Opisthopneumonia, 76 

 Oral angle plates, 358 

 lobes (Lam.), 105 

 Orocystis Helmhackeri, 313 

 Orophocrinus, 315 



stelliformw, 314 



Orphnurgits, 418 

 Orthoceras group, 68 

 Orthopsis, 299 

 Oscainius, 10 

 Osphradium, 84, 162-164 

 Ostracoteuthis, shell, section, 69 

 Ostrea, 17 



edulis, anatomy, 16 

 Ostreidce, 17 

 Owenia, 24 

 Oxygyrus, 108 

 Oxynoe, 12 

 Oxynoidea, 12 



PAL&ASTER, 295 

 Palceasteroidea, 295 

 Palceechinoidea, 288 

 Pcdceechinus, 289 



elegans, 289 



Palceobrissus, 293 

 Palceocoma, 295 

 Palceocrinoidea, 303 



Murrayi, 294 



Palceostoma, 295 

 Palceotropus, 429 

 Pallial cavity, 26 ; line, 64, 124 ; sinus, 



64, 124 



Palliata ( = Tectibranchid), 46 

 Pallium, 26 

 Palmars (Grin.), 371 

 Palmipes, 297 

 Paludina, ctenidium, 85 



vivipara, circulatory system, 



203 ; development, 252, 254, 



255 



Paludinidce, 5 

 Pancreas (Ceph.), 196 

 Pandvridce, 21 

 Pannychia, 285 

 Papula, 439 

 Paractinopoda, 288 

 Paramenia impexa, 216 

 palifera, 184 

 Parameniidce, 3 

 Parapodia, 106 

 Pa rar chaster, 296 

 Parasalenui, 290 



Parasira (Tremoctopus) catenulata, 230 

 Parelpidia, 418 



2 R 2 



