INDEX. 



837 



Oreodontidce, 707, 722. 



Organ of Bojanus, 392, 401. 



Organ-pipe Corals, 167. 



Organic and inorganic matter, differences 

 between, 2. 



Organs of the mouth of Insects, 336 et 

 seq. 



Oribatidce, 322. 



Oriole, 627. 



Ornithodelphia, 655. 



Ornithorhynchus, 648, 652, 655, 656, 657, 

 658. 



Ornithosaiiria, 563, 565. 



Orohippus, 701, 702. 



Orthoceras, 434, 436. 



Orthoceratidce, 436. 



Orthoptera, 336, 340, 344; characters of, 

 349. 



Ortonia, 271. 



Orlyx, 614. 



Orycteropidce, 677. 



Orycteropus, 673, 677, 678. 



Oscula, of Sponges, 83, 87 ; of Tapeworm, 

 231, 233. 



Osteolepis, 491, 505. 



Ostraciontidce, 488. 



Ostracoda, 283 ; characters of, 293 ; dis- 

 tribution of, in time, 313. 



Ostracostei, 492, 449, 505. 



Ostrea, 403. 



Ostreidce, 403. 



Ostrich, 577, 578, 581, 583, 594, 595, 596. 



Ostrich (American), 596. 



Otarladce, 736, 737, 738. 



Otidce, 612. 



Otter, 744. 



Oudenodon, 563. 



Ounce, 751. 



Ovarian vesicles of Sertularida , 122, 123. 



Ovibos, 721. 



Ovicells (Polyzoa], 375. 



Ovidce, 718, 719, 723. 



Ovipositor, 336, 357, 358. 



Ovis, 720. 



Ovulitidea, 74. 



Owls, 630, 631. 



Oxen, 720, 721. 



Oxyuris, 245, 246. 



Paca, 755. 

 Pachycardia, 478. 

 Pachydermata, 692. 

 Pachyglossa, 547. 

 Paddle-fish, 494. 

 Paguridce, 310. 

 Pagurus, 310. 

 Palceaster, 223. 

 Palcechinus, 200, 224. 

 Palceichthyes, 503. 

 Palceocastor, 760. 

 Palceocaris, 314. 

 Palceocoryne, 150. 

 Palseocrinoids, 210, 223. 

 Palcpodiscus, 223. 

 Palceogithalus, 629. 

 Palceonyctis, 751. 

 Palceophis, 544, 545. 

 Palceortyx, 618. 

 Palceosiren, 524. 

 Palceotheridce, 699. 

 Palceotherium, 699. 

 Palceotringa, 612. 



Palamedea, 609. 



Palapteryx, 599. 



PaUnurus, 307. 



Pallial line, 399, 401. 



Pallial sinus, 401. 



Palliobranchiata, 388. 



Pallium (see Mantle). 



Palmipedes, 600. 



Paludicella, 376, 379. 



Paludina, 416. 



Paludinidce, 412, 415. 



Palythoa, 157. 



Pamphagus, 65. 



Panda, 741. 



Pangolin, 677. 



Panorpidce, 351. 



Panspermy, 45. 



Panther, 750. 



Pantopoda, 319. 



Paper Nautilus (see Argonaut). 



Paradiseidce, 625. 



Paradoxurus, 746. 



Paramcecium, structure of, 95-97 ; repro- 

 duction of, 97. 



Paramuricea, 174. 



Parapodia, 257. 



Paridce, 626, 627. 



Parkeria, 76. 



Parra, 609. 



Parrakeets, 621. 



Parrots, 576, 580, 583, 586, 619, 620. 



Parthenogenesis, 38 e seg. 



Partridge, 614. 



Pasceolus, 388. 



Passeres, 622. 



Patella, 409. 



Patellidce, 412. 



Pauropoda, 329, 330. 



Pauropus, 327, 328, 329, 330, 331. 



Pao, 615. 



Pavonaria, 168. 



Pavonince, 614 



Peachia, 154, 155, 157. 



Pea-fowl, 615. 



Pear-enerinites, 212, 223. 



Pearl-mussels, 403. 



Pearly Nautilus, 420, 421, 425, 426, 430 ; 

 anatomy of, 431; distribution in space, 

 435. 



Peccary, 707. 



Pecten, 403. 



Pectinaria, 265, 266. 



Pectinatella, 374. 



Pectunculus, 397. 



Pedation, 251. 



Pedetes, 759. 



Pedicellarise, 196, 202. 



Pedicellina, 376, 379. 



Pediculus, 345, 346. 



Pedipalpi, 323. 



Pelagia, 138. 



Pelagidce, 137, 138, 139 ; structure of 

 generative zooids of, 141. 



Pelagoneinertidce, 242. 



PeZias, 539, 541. 



Pelican, 604. 



Pelicanidce, 604. 



Pelonaia, 369, 387. 



Peltogaster, 286. 



Pen of Cuttle-fishes, 425, 429. 



Peneus, 307. 



Peneroplidea, 74. 



