458 ECHINODERMS OF THE BRITISH ISLES 



Ophiohyrsa, 171 

 Oph iohyrscUa ,171 

 Ophiooaiiiax, 183, 184 

 Ophioccntrus, 218 

 Ophiocliiton, 224 

 Ophiochitonidas 166, 223 

 Opliiochoiulrus, 184, 196 

 Ophiocnida, 208 

 Ophiocoma, 178 

 Opliiocomida^, 165, 177 

 Opliiocomina, 177 

 Opliioconis, 226 

 Ophiocrates, 228 

 Ophiocreas, 157 

 Oi)hiocten, 230, 246 

 Ophiodera, 167 

 Ophioderma, 225, 226 

 OpluodermatidiTe, 165, 225 

 Ophiogeron, 167 

 Ophioglypha, 232 

 Ophioglyphina, 233 

 Ophiolebes, 183, 184 

 Ophioleda, 183 

 Ophiolepidse, 165, 228 

 Ophiolepididce, 228 

 Ophioleucidse, 165, 227 

 Ophiolimna, 188 

 Ophiomedea, 183, 184 

 Ophiomisidiiim, 228, 230 

 Ophiomitrella, 184, 185 

 Ophiomusium, 230, 252 

 Ophiomyces, 183, 184 

 Ophiomyxa, 167 

 Ophiomyxidaj, 165, 166 

 Ophionereis, 224 

 Ophiopeltis, 208 

 Ophiopholis, 198, 204 

 Ophiophrixus, 167, 171 

 Ophiophycis, 229, 230 

 Ophiopleura, 230, 249 

 Ophioplinthaca, 183, 184 

 Ophioplus, 197 

 Ophiopora, 187 

 Ophiopsila, 177, 179 

 Ophiopteron, 173 

 Ophiopus, 198, 203 

 Ophioscolex, 167, 169 

 Ophiostigma, 208 

 Ophioteresis, 145 

 Ophiothamnus, 183, 184 

 Ophiothrix, 173 

 Ophiotoma, 184, 187 

 Ophiotrema, 183, 184 

 Ophiotrichidae, 165, 172 

 Ophiotrichoides, 173 

 Ophiotypa, 229 

 Ophiozea, 233 



Ophiozona, 232 

 Opliiozonella, 229, 230, 232 

 Ophiura, 230, 232 

 Ophiura, 226, 227 

 Ophiura^, 156, 164 

 Ojiliiuroidea, 10, 145 

 OpFiiuroids, 10, 145 

 Orcula, 411 

 Orthometra, 26, 38 

 Ova, 323 



P^lopatides, 378, 388 

 Palceobrissus, 322 

 Pateopneustidse, 321, 322 

 Pateotropus, 322 

 Palmipes, 99 

 Pannychia, 360 

 Paracentrotus, 293, 306 

 Paractinopoda, 423 

 Paragonaster, 79 

 Paramphiura, 208, 219 

 Pararchaster, 73 

 Parastichopus, 389 

 Parechinus, 294 

 Paroriza, 386 

 Paxillosa, 50 

 Pectinaster, 71 

 Pectinura, 226 

 Pedicellaster, 129, 439 

 Pedicellasteridae, 122, 129 

 Pedinidae, 278 

 Pelagothuria, 376 

 Pelagothuriidse, 359, 376 

 Pelmatozoa, 9 

 Pelopatides, 388 

 Peltaster, 79, 80 

 Peniagone, 366, 369 

 Peniagoninae, 365 

 Pentacriiius, 15 

 Pentagonaster, 80 

 Pentametrocrinidse, 16, 23 

 Pentametrocrinus, 23 

 Periamma, 365, 368 

 Peripatagus, 322 

 Persephonaster, 55, 64 

 Phanerozonia, 49, 50 

 Phormosoma, 279 

 Phoxaster, 61 

 Phrynophiurae, 156 

 Phyllophorinae, 395, 408 

 Phyllophorus, 409 

 Plagiobrissiis, 326 

 Planktothuria, 377 

 Plesiodiadema, 277 

 Plexechinus, 341 

 Plicatocrinidae, 15 

 Plinthaster, 80, 83 



