INDEX 



613 



Olividce, 6 



Ollacrinus {see Gilbertsocrinus) 



Ommastreplies, 24 \ gonad, female, 230 ; 



shell, section, 69 

 Omiuatoi^liore, 102 



Oiniiiatiiftti-fphes, 2^ ; nervous system, 148 

 OiicidkUa, 46 

 Oiicidiidce, 8 

 Oncidium, 44, 104 



,, celticuni, genital organs, 235 ; 



larva, 256 

 Oneiroplmnta mutabUis, rod, 237 

 Onychoteuthis, 24 

 Operculum, 31 

 Ojihiacantha, 300 



,, marsiipialis, 495 ; vivipara, 



495 

 Ophiactis, 300 



„ MiXUeri, 506 

 „ poa, 300 

 „ Savigiiy, 506 

 „ virens, 498 ; disc, section, 426 

 Ophiarachna incrassata, vertebral ossicles, 



356 

 Ophidiaster Germani, 421 

 Ophiocermnis, 327 

 Ophiocnida, 300 



„ sexradia, 506 



OpMocoma, 300 



„ pumila, 506 



„ Valencice, 506 ; 



Ophiocreas, 301 

 Ophioderma { = Ophiura), 495 

 Ophiodiaster, 298 



,, diplax, regeneration of arms, 



505 

 Ophioglyplm, 300 ; bursa, 495, 496 ; disc, 

 section, 497 

 „ alhida, stomaoh, 494 



,, hexactis, 495 



,, lacertosa, ovary, section, 497 



Opih iofjlyph idix, 300 

 Oji/iiii/ic/us uiidjella, arm joint, 357 

 OpI till must Lc, 327 

 Ophiomitra exigua, 327 

 Ophiomusium, 300 



„ validum, apical system, 327 



Ophimnyxa, 300 



,, vivipara, 495 



Ophiomyxidm, 300 

 Ophionereis, 422 

 Ophioplocus, 422 



Ophicpteron elegans, brachial joints, 391 

 Ophiopya longispimis, oral skeleton, 359 

 Opliiopyrgus, 327 

 Ophiothela dividiin, 506 

 ,, isidicola, 506 

 Ophiotlwlia, 392 

 Ophiothrix, 300 



„ fragilis, ambulacral tentacle, 



section, 466 ; nervous sys- 

 tem, 456 

 Ojihiozona, 300 



VOL. II 



Ophiura, 300 



Ophiiirce, 300 



Op>hiuroidea, 299-301 ; arm, section, 412 

 arm, joint, 357 ; disc, section, 486 

 Pluteus, 533 ; nervous system, 456 

 ring sinus, 496 



Opisthohrandiia, 10, 33 ; heart, 199 



Opisthopneumonia, 76 



Oral angle plates, 358 

 ,, lobes (Lam.), 105 



Orocystis Helmluickeri, 313 



Ch-opJujcrinus, 315 



„ stelliformis, 314 



Orphnurgus, 418 



OrtJwceras group, 68 



Qrthopsis, 299 



Oscainius, 10 



Osphradium, 84, 162-164 



Ostracoteuthis, shell, section, 69 



Ostrea, 17 



„ edulis, anatomy, 16 



Ostreidce, 17 



Owenia, 24 



Oxy gyrus, 108 



Oxynoe, 12 



Oxynoidea, 12 



Pal^aster, 295 

 Palceasteroidea, 295 

 Palceechinoidea, 288 

 Palceechinus, 289 



„ elegans, 289 



Paheobrissus, 293 

 Pakcocoma, 295 

 Paldiocrinoidea, 303 

 Palceopneustes, 293 



„ Murray i, 294 



Palceostoma, 295 

 Palceotropus, 429 

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



64, 124 

 PaUiafa ( = Tectibranchia), 46 

 Pallium, 26 

 Palmars (Crin.), 371 

 Pabnipes, 297 

 Paludina, ctenidium, 85 



„ vivipara, circulatory system, 

 203 ; development, 252, 254, 

 255 

 Paludinidcc, 5 

 Pancreas (Ceph.), 196 

 Pandoridce, 21 

 Pannychia, 285 

 Papulae, 439 

 Paractinopoda, 288 

 Paramenia impexa, 216 

 „ palifera, 184 



Paravieniidw, 3 

 Parapodia, 106 

 Pararcliaster, 296 

 Parasalenia, 290 



Parasira (Tremoctopus) catenulata, 230 

 Parelpidia, 418 



2 R 2 



