GENERAL INDEX. 
591 
Odontochila, ii. 486 
Odontolabris, ii. 493 
Odontophorvs, ii. 339 
Odontopkrynus, ii. 420 
CEdemia, ii. 364 
(Edicnemis, ii. 355 
OMura, ii. 399 
(Ena, ii. 332 
Ogmodon, ii. 383 
Ogyris, ii. 477 
Oligdon, ii. 375 
OLIGODONTID^E, ii. S74 
Oligosarcus, ii. 445 
Olisthopus, ii. 489 
Olylogon, ii. 418 
Olyra, ii. 442 
Oviaseus, ii, 489 
Ommatophoca, ii. 204 
Omolepida, ii. 397 
Omostenus, ii. 492 
Ompkalotropis, ii. 521 
Omus, ii. 487 
ONCIDIADjE, ii. 517 
Oncidium, ii. 518 
Onycliodactylus, ii. 413 
Onychogale, ii. 195 
Onychogalea, ii. 251 
Onychognathus, ii. 28S 
Onchorhynchus, ii. 447 
Oncostoma, ii. 101 
Ophidia, classification of, i. 99 
OPHIDIA, ii. 372 
remarks on the general distribution of, ii. 
3S6 
fossil, ii. 387 
0PH1DI1ILE, ii. 440 
Ophidium, ii. 440 
OPHIOCEPHALIDjE, ii. 435 
Ophiodes, ii. 397 
OPHIOMORIDiE, ii. 398 
Ophiomorus, ii. 398 
Ophiophagus, it 383 
Ophiops, ii. 391 
Ophioscincus, ii. 397 
Ophisaurvs, ii. 392 
Ophites, ii. 380 
Ophonus, ii. 489 
Ophryodera, ii. 487 
Ophysia, ii. 209 
OPISTHO-BRANCHIATA, ii. 529 
OFISTHOCOMI, ii. 345 
Opisthocomus, Brazilian caves, i. 164 
ii. 345 
Opisthodelphys, ii. 418 
Opisthostoma, ii. 520 
Opistlioporus, ii. 520 
Oporornis, ii. 279 
Opossum, extinct in European Miocene, i. 121 
Opossums, ii. 248 
Opsariichthys, ii. 452 
Opsiphanes, ii. 472 
Orang-utan, ii. 171 
Orca, ii. 209 
Orcaella, ii. 209 
Orchesticus, ii. 99 
Orchilus, ii. 101 
Oreas, ii, 223 
Oreicola, ii. 260 
Oreinus, ii. 452 
Oreocephalus, ii. 401 
Oreocincla, ii. 256 
Oreodeira, ii. 401 
Oreodon, N. American Tertiary, i. 138 
Oreodontidce, N. American Tertiary, i. 138 
Qrececa, ii. 271 
Oreomanes, it 278 
Oreo?iectes, ii. 453 
Oreonympha, ii, 108 
Oreoperdix, ii. 338 
OREOPHASiNiE, ii, 343 
Oreophasis, it 343 
Oreophilus, ii. 356 
Oreopyra, ii. 107 
Oreortyx, ii. 339 
Oreoscoptes, ii. 256 
Oreothraupis, ii. 99 
Oreotrochilus, ii. 107 
Orestias, ii. 450 
Oriental region, defined, i. 75 
subdivisions of, i. 75 
description of, i, 314 
zoological features of, i. 315 
mammalia of, i. 315 
birds of, i. 316 
reptiles of, i. 317 
amphibia of, i. 317 
fresh-water fishes of, i. 318 
summary of vertebiata of, i. 318 
insects of, i. 318 
sub-regions of, i. 321 
concluding remarks on, i. 362 
tables of distribution of animals of, i. 864 
Oriental relations of W. African sub-region, i. 
265 ' 
Oriental and Palsearctie faunas once identical, 
i. 362 
Oriental and Ethiopian faunas, cause of their 
resemblances, i. 363 
Origma, ii. 260 
Oriocalotes, ii. 402 
Orioles, ii. 268 
ORIOLID7E, ii. 268 
Oriolus, ii. 268 
Orites, ii. 266 
Ornithion, ii. 101 
ORNITHORHYNCHIDiE, ii. 253 
OrnithorhynchuFs, ii. 253 
Oroccetes, ii. 256 
OroMppus, N. American Tertiary, i 136 
Ortalida, ii. 343 
Orthagoriseus, ii. 457 
Orthalicus, ii, 516 
ORTHIDtE, ii. 532 
ORTHOCERATID^E ii. 500 
Orthodon, ii. 452 
Orthogonius, ii. 491 
Orthogonys, ii. 98 
Orthonyx, ii, 260 
Orthorhynchus, ii. 108 
Orthotomus, ii. 257 
Ortygometra, ii. 352 
Ortygornis, it 338 
Ortyx, ii. 339 
Ortyxelos, ii. 341 
ORYCTEROPODIDjE, ii. 246 
Orycteropus, ii. 246 
Oryctervs , ii. 231 
ORYGINjE, ii. 223 
Oryx, ii. 223 
Oryzoborus, ii. 285 
Oryzorictes, ii. 188 
Osmerus, ii. 447 
Osphranter, ii. 251 
Osteobrama, ii. 453 
Osteochilus, ii. 451 
Osteogeniosus, ii. 443 
OSTEOGLOSSIDjE, ii. 454 
Osteoglossum, ii. 454 
Ostinops, ii. 282 
OSTREIDiE, ii. 533 
Ostrich, Miocene of N. India, i. 102 
Ostriches, it 368 
