INDEX 



597 



Olfaclor)' lobe, 469 



nerve, 471 



organs, 115 

 OligochosLte, 278 

 Oligopyreme, 73 

 Oligosoma, 530 

 Oligotrochus, 30S 

 OlivirUe, 334 

 Ommaslrephes, 347 

 Omasus, 56S 

 Ommatidia, 356 

 Oncosphffira, 251 

 Oniscus, 3S6 

 Ontogeny, 2 

 Oocyte, 71, 132 

 Ookinete, 1S3, 190 

 Oospores, 169 

 Ootype, 244 

 Opalina, 195 

 Opercular cleft, 502 

 Operculum, 2S5, 327 



of fishes, 497 

 Ophidia, 530 

 Ophioglypha, 299 

 Ophiopholis, 299 

 Ophisaurus, 530 

 Ophiurioidea, 29S 

 Ophryodendron, 19S 

 Ophr)-oscolex, 197 

 Opisthobranchia, 334 

 Opisthocoele, 455 

 Opislhopatus, 400 

 Opisthotic, 45S 

 Opossum, 560 



shrimp, 376 

 Opoterodonta, 531 

 Optic cup, 477 



ganglion, 119, 476 



lobes, 470 



nerve, 471 



stalk, 477 



thalami, 469 



vesicle, 477 

 Orange scale, 430 

 Orang-utan, 574 

 Ora serrata, 121 

 Oralia, 292, 301 

 Orbitelaria, 396 

 Orbitosphenoid, 458 

 Orbitotemporal fossa, 522 

 Orb weavers, 396 

 Orchestia, 3S4 

 Organ-pipe coral, 230 

 Organs, 88 



animal, 90, no 



Organs, assimilation, 91 



auditor)', 116 



of Bojanus, 321 



circulatory, 99 



of Corti, 478, 552 



electric, in 



ex( retory, 104 



Jacobson's, 475 



larval, 150 



of locomotion, no 



lyriform, 390 



olfactory, 115, 474 



phosphorescent, 121 



respirator)-, c)6 



segmental, 105 



sensory, 114 



sexual, 107 



of smell, 115, 474 



systems of, 90 



tactile, 115 



of taste, 115, 474 



tympanal, 117 



vegetative, 90 



visual, iiS 



urogenital, 109 

 Orioles, 544 

 Origin of species, iS 

 Ornithodelphia, 558 

 Ornithorhynchus, 559 

 Orohippus, 569 

 Oronasal groove, 475 

 Orlhis, 290 

 Orthoceras, 346 

 Orthonectida, 200 

 Orthoneurous, 330 

 Orthoptera, 421 

 Orthopoda, 528 

 Orycteropus, 563 

 Oscarella, 205 

 Oscines, 544 

 Osculum, 202 

 Os innominatum, 550 

 Osinerus, 510 

 Osphradium, 116, 312 

 Ossein, 77 



Ossicula auditus, 479 

 Ostariophysi, 510 

 Osteoblasts, 78 

 Ostia of heart, 103, 357 

 Ostium tubte, 487 

 Ostracoda, 371 

 Ostracodermi, 493, 512 

 Ostracoteuthis, 341 

 Ostncida:, 323 

 Os trans versum, 522 



Ostriches, 542 

 Otaria, 565 

 Otica, 45S 

 Otic capsule, 457 



ganglion, 473 

 Otis, 544 

 Otolith, 116 

 Otter, 565 

 Ovaries, 4S6 

 0\'ary, histology of, 70 

 Ovibos, 569 

 Ovicells, 286 

 Oviducts, 109, 4S6 

 Oviparous, 151 

 Ovipositor, 413 

 Ovis, 569 

 Ovoid gland, 293 

 Ovoviviparous, 151 

 Ovum, 486 

 Ov'let moths, 433 

 Owls, 544 

 Oyster crab, 3S2 

 Oysters, 323 

 Ox warble, 431 

 Ox)'-h;emoglobin, 79 

 Oxyrhyncha, 382 

 Oxj'stomata, 382 

 Oxyuris, 266 



Pachyderm, 570 

 Pachydrilus, 279 

 Pachylemuridte, 573 

 Paddle fish, 508 

 Pasdogenesis, 129, 414 

 Paguridea, 3S0 

 Palicchinoidea, 305 

 Palaimon, 380 

 Palceinonetes, 3S0 

 PaliCocraniuiTL, 4 c; 5 

 Palajocrinoidea, 302 

 Pala;otheriuni, 569 

 Palate, 475 

 Palatine bone, 461 

 Paleacrita, 433 

 Palinurus, 3S0 

 Pallial line, 318 



sinus, 318 

 Pallium, 311, 469 

 Palolo worm, 275 

 Palpus, 353, 377, 4c5 

 Paludicella, 2S7 

 PaludinidK, 334 

 Pancreas, 96, 481 

 Pandalus, 380 

 Pandicn, 544 



