596 



INDEX. 



Oceanic Hydrozoa, 74. 



Octopodidce, 275, 294. 



Oculinidce, 97, 100. 



Odontaspis, 335, 340. 



Odontoceti, 419. 



Odontopteris, 486, 487, 498, 499. 



Ogygia, 167, 169. 



Oldhamia, 79, 195. 



Old Red Sandstone, 520, 521. 



Olenidce, 167, 168. 



Olenus, 167, 168. 



Oligochceta, 136. 



Oliva, 248, 249. 



Olivella, 249. 



Ommastrephes, 295. 



Onchus, 335, 337. 



Oniscws, 161, 176. 



Oolitic period, rocks of, 535; life of, 537; 

 flora of, 497. 



Ooze, Atlantic, 23. 



Opercidata, 266, 268. 



Operculum, of Cirripedes, 150; of Euryp- 

 terids, 173 ; of Limulus, 174 ; of Gas- 

 teropoda, 241 ; of Maclurea, 263 ; of 

 Theca, 270. 



Ophiderpeton, 352. 



Ophidia, characters of, 360; distribution 

 of, in time, 860. 



Ophileta, 256, 264. 



Ophipcoma, 117. 



Ophipderma, 117. 



Ophiolepi*, 117. 



Ophiomorpha, 347. 



Ophiura, 116. 



Ophiuroidea, characters of, 115; distribu- 

 tion of, in time, 117. 



Opisthobranchiata, 245. 



Opisthocoelia (CrocodHia), 366, 368. 



Opossum, 411. 



Oracanthtts, 338. 



Orbitoides, 62. 



Orbitolites, 62, 72. 



Orbulina, 61. 



Orchestia, 176. 



Oreaster, 114, 115. 



Organic types, succession of, 52-54. 



Oriskany Sandstone, 522. 



Ormpxylon, 474, 482. 



Ornithorhynchus, 406, 407. 



Omithoscelida, 377, 380. 



Omithosauria, 375. 



Orodus, 339. 



Ort/m, 208, 209. 



Orthisina, 208, 209. 



Orthoceras, 276, 283, 284, 534. 



Orthoceratidce, 276, 283. 



Orthonota, 225, 226. 



Orthoptera, 185, 186, 187. 



Ortonia, 518. 



Osborne series, 549. 



Osmeroides, 316. 



Osteolepis, 321, 326, 327. 



Ostraciontidce, 318. 



Ostracoda, characters of, 156; distribution 

 of, in time, 156, 157, 533. 



Ostracostei, 323, 330. 



(Mrea, 220, 221. 



Ostreidce, 218, 219. 



0is, 392. 



Otodus, 340, 341. 



Otozamites, 497. 



Otozoum, 533. 



Oudenodon, 363, 373, 374. 



Ovarian capsules of Graptolites, 81. 



Ovarian pyramid of Cystideans, 131. 



Ovibos, 440. 



Ovicell, 193. 



Oindce, 437, 439, 441. 



Owis, 439. 



Oxford Clay, 536. 



Oxyrhina, 340, 341. 



Pachydermata, 423. 



Pachypteris, 498. 



Pachyrisma, 234, 236. 



Pachyseris, 96. 



Pachytheca, 474, 480. 



Paddlefish, 333. 



Paguridce, 180. 



Pagurus, 180. 



Palcearca, 228. 



Palceaster, 111, 114, 115. 



Palcechinus, 108, 110. 



Palcega, 177. 



Palceiehthyes, 345. 



Palceinachus, 180. 



Palceochorda, 142. 



Palceocoma, 114, 115. 



Palceocoryne, 75. 



Palceocrinoids, 123, 126. 



Palceocyclus, 97. 



Palceocyon, 454. 



Palceodiscus, 114, 115. 



Palaeolithic Man, 468. 



Palceomanon, 68. 



Palceoniscus, 323, 530, 534. 



Palceonyctis, 452. 



Palaeontological Record, imperfection of, 



27-39. 



Palaeontology, definition of, 1. 

 Palceophis, 361. 

 Palceophycus, 477, 479. 

 Palceopteris, 485. 

 Palceopyge, 167. 

 Palceosaurus, 368. 

 Palceosiren, 347. 

 Palceospalax, 463. 

 Palceospongia, 68. 

 Palceotheridce, 427. 

 Palceotherium, 427. 

 Palceotringa, 390, 392. 

 Palceoxylon, 493. 

 Palapteryx, 390, 394. 

 Palasterina, 114, 115. 

 Pali (Corals), 92. 

 Palinurus, 179. 



Pallial line, of Bivalve shells, 216. 

 Pallial sinus, 217. 

 Palmacites, 494. 

 Paludicellea, 194. 

 Paludina, 245, 255. 

 Paludinidce, 255. 

 Pandanece, 499. 

 Pandanus, 499. 

 Panopoea, 238. 

 Paper Nautilus, 294. 

 Paradoxidce, 168. 

 Paradoxides, 167, 168, 169. 

 Paramuricea, 99. 

 Parasmilia, 543. 

 Parkeria, 65. 

 Passeres, 395. 

 Patella, 242, 259. 

 Patellidce, 259. 

 Pauropoda, 183, 184. 



