698 



INDEX. 



Onchuna, 227. 



Onchus, 429. 



Oncidiadce, 339, 341. 



Oncidium, 341. 



Oniscus, 244. 



Onychoteuthis, 345, 357. 



Operculata, 339, 341. 



Operculum, of JBalanidie, 231, 233 ; of Gas- 



teropoda, 330 ; of Heteropoda, 337 ; of 



Fishes, 389, 390. 

 Ophicrinus, 175. 

 Ophidia, 448 ; general characters of, 453, 



e seqr. ; divisions of, 456 ; distribution 



of, in time, 459. 

 Ophidobatrachia, 434. 

 Ophiocoma, 169, 182. 

 Ophioderma, 182. 

 Ophiolepis, 169, 182. 

 Ophiomorpha, 434. 

 Ophisaurus, 462. 

 Ophiura, 169. 

 Ophiuridea, 170. 

 Ophiuroidea, 156, 157 ; general characters 



of, 169 ; families of, 170 ; distribution of, 



in space, 180 ; in time, 182. 

 Opisthobranchiata, 335, 336. 

 Opisthoccelia (Crocodilia), 471. 

 Opossum, 562, 563. 

 Orang-outang, 636. 

 Orbitoidts, 66. 

 OrbitoHtes, 62. 

 Oreaster, 182. 

 Organ of Bojanus, 325. 

 Organ-pipe Coral, 138. 

 Organs of the mouth of Insects, 270,- et seq. 

 Oribatidce, 260. 

 OrnithoJelphla, 551, 555. 

 Ornithorhynchus, 543, 548, 551, 555, 56. 

 Ornithosauria, 476. 

 Orthis, 317. 

 Orthisina, 317. 

 Orthoceras, 356, 358, 360. 

 Orthoceratidce, 358, 360. 

 Orthoptera, 269, 279, 292. 

 Ortonia, 216. 

 Orfyor, 516. 

 Orycteropidce, 569. 

 Orycteropus, 569. 

 Oscula, of Sponges, 70, 76 ; of Tapeworm, 



186. 



Otsteolepis, 415, 428. 

 Ostraciontidrv, 412. 

 Ostracion, 411. 

 Ostracoda, 226 ; characters of, 334 ; dis- 



tribution of, in time, 253. 

 Ostracostei, 415, 417. 

 Osfrea, 326, 327. 

 Ostreidce, 325, 327. 

 Ostrich, 511, 512. 

 Otaria, 606. 



Otter, 611. 



Owdenodon, 475. 



Ounce, 616. 



Ovarian vesicles, of Sertularida, 101. 



Ovibos, 598. 



Otncte, 597. 



Ovipositor, 269, 288. 



Ovis, 597. 



Ovulum, 339. 



Owls, 529. 



Oxen, 591, 597, 646. 



Oxyuris, 195. 



PACA, 619. 



Pachi/dermata, 580. 



Paddle-fish, 416. 



Paguridiv, 249. 



Palceaster, 182. 



Pal<zchinus, 163, 182. 



Palceichthyes, 426. 



Palixocoryne, 123. 



Palseocrinoids, 176. 



Palaodiscus, 182. 



Palceophis, 460. 



Palceosiren, 443. 



Palwosponffia, 75. 



PalcKOtheridce, 584. 



Palceotherium, 584, 6;4. 



Palckotringa, 534. 



Palamedea, 508. 



Palapteryx, 535. 



Pali (Corals), 131. 



Pallial line, 323, 321, 825. 



Pallial sinus, 325. 



Palliobranchiata, 312. 



Pallium (see Mantle). 



Paludicdla, 303. 



Paludicellea, 306. 



Palud.na, 340. 



Paludinidce, 33 P, 340. 



Paludomus. 339. 



Palythoa, 13}. 



Pamphaffus, 57. 



Pangolin, 569. 



Panopcea, 328. 



Panspermy, 38. 



Panther, 616. 



Pantopoda, 258. 



Paper Nautilus, 344, 349, 350. 



tPapio, 635. 



Paradiseidce, 524. 



Paradoxurus, 610. 



Paramcecium, 39, 77 ; structure of, t'6. ; 



reproduction of, 78. 

 Paramuricea, 141. 

 Parapodia, 206. 

 Paring 526. 

 Parkeria. 65. 

 Parmacella, 341. 

 Parmaphorus, 340. 

 Parra, 508. 

 Parrakeets, 521. 

 Parrots, 520, 521. 

 Parthenogenesis, 32, e<s^. ; of Ostracoda, 



2b5 ; of Insects, 32, ef se^. 

 Passeres, 522. 

 Patagium, 476, 623. 

 Patella, 333, 340. 

 I'atellidce, 336, 340. 

 Pauropoda, 267. 

 Pauropus, 264, 65, 267. 

 -Pauo, 516. 

 Pavonaria, 138. 

 Pavonince, 516. 

 Peachia, 128, 145. 



Pearly Nautilus, 344, 345, 349, 353, 357. 

 Peccary, 587, 649. 

 Pecten, 326, 327. 

 Pectinaria, 212. 

 Pectunculus, 327. 

 Pedetes, 621. 

 Pedicellariae, 160, 164. 

 Pedicdlina, 303. 



