382 



INDEX 



Neolimulus, 342 



Neotremata, 172 

 Neptunea, 246 

 Nerinea, 243 

 Nerita, 241 

 Neritina, 241 

 Neuroptera, 335 

 Niobe, 311 

 Nod os a Ha, 23 

 Notonectidae, 336 

 Nucleolites, 130 

 Nucleus (Protozoa), 15 



,, of operculum, 236 

 Nucula, 210 

 Nucuhuia, 211 

 Nudibranchia, 248 

 Nullipore zone, 185, 253 

 Nummulites, 25 

 Nummulitic Limestone, 27 

 Nyctiphanes, 324 



Obelia, 53 

 Obolella, 171 



Octactinellida, 44 

 Octopoda, 284 

 Octopus, 279, 284 

 Ocular j:>lates, 117 

 Oculina, 104 

 Odonata, 335 

 Odontochlle, 307 

 Odontophore, 197, 232, 259 

 Ogygia, 306 

 Olcostephanus, 287 

 Olenelloides, 304 

 Olenellus, 304 

 Olenus, 305 

 Oligocbseta, 158 

 Oligoporus, 121 

 OmphalophyUia, 104 

 Omphalotrochus, 240 

 Omphyma, 89 

 On I sens, 325 

 Ontogeny, 13, 167, 270 

 Onychocella, 195 

 Onychophora, 289 

 Ooecium, 190 

 Operculina, 26 

 Operculum, 236, 340 

 Ophidioceras, 287 

 Ophileta, 254 

 Ophiocten, 115 

 Opliioglypha, 114, 115 



Ophiolepis, 115 

 Ophiura, 114, 115 

 Opbiuroidea, 112-115 

 Opilionina, 354 

 O^'s, 220 



Opisthobranchia, 248, 254 

 Oral plates, 140 



,, surface, 108 

 Orbieuloidea, 173 

 Orbitoides, 26 

 Orbitolina, 23 

 Orbitolites, 22 

 Orbitremites, 155 

 Orbulina, 24 

 Order, 13 



Organ-pipe coral, 94, 103 

 Omithella, 183 

 Orophocrinus, 150, 155 

 Cb-to, 177 

 Ortlwceras, 263 

 Orthoptera, 335 

 Orthothetes, 177 

 Osculum, 31 

 Ostracoda, 313 

 OsZrea, 216 



Outer lip (Gasteropoda), 235 

 Outer-side-plate, 154 

 Oxyclymenia, 271 

 Oxynoticeras, 275 

 Oxytoma, 214 

 Oxyuropoda, 325 



Pachastrella, 36, 42 

 Pachinion, 42 

 Pachydiscus, 287 

 Pachypora, 99 

 Pachyrisma, 219 

 Palceaster, 110 

 Palceasterina, 110 

 Palceechinus, 125 

 Palcega, 326 

 Palceinaclnis, 332 

 Palceocardita, 231 

 Palaocaris, 323 

 PaliBocoma, 111 

 Palaocorystes, 331 

 Palceoctopus, 284 

 Palaodiscus, 133 

 Palcsoneilo, 231 

 Palaontina, 335 

 Palaopalcemon, 325 

 Palccophonus, 353 



