522 



INDEX. 



Nothoceras, ii. 72. 



Nothosaurus, ii. 221. 



Notidanus, ii. 154, 161. 



Notornis, ii. 262. 



Nototherium, ii. 295, 296. 



Nuhecidaria, i. 108. 



N ucleohranchiata (see Heteropoda), ii. 



6, 38. 

 Nudeocnnus, i. 304. 

 Nucula, i. 488, 489. 

 Nuculana, i. 489. 

 Nuxulanidcc, i. 485, 489. 

 Nucvlidcc, i. 485, 488. 

 Nudihranchiata, ii. 6. 

 NuUipares, i. 20; ii. 431. 

 NummvMna, i. 103, 118, 119, 120. 

 NummuUiiida, i. 106, 117, 118. 

 Nummulitic Limestone, i. 17, 120. 

 A^UDimidiiidea, i. 106. 

 JVuthetes, ii. 205. 

 Nyctilestes, ii. 413. 

 Nyctisaurus, ii. 229. 

 Nyctitherium, ii. 413. 

 NymphalituE, i. 407, 408. 

 Nyssa, ii. 476. 



Oholella, i. 461. 



Oto^Ms, i. 460, 461. 



Oceanic Hydrozoa, i. 153, 154. 



Ochotherium, ii. 305. 



Ododon, ii. 408. 



OctodontidcE, ii. 407. 



Octopodiilce, ii. 57, 89. 



Oculina, i. 190. 



Oculinidce, i. 173, 187, 190. 



Odontaspis, ii. 154, 162. 



Odontoceti, ii. 313. 



Odontolcoe, ii. 268. 



Odontopteris, ii. 452, 453, 454, 467, 

 468. 



Odontoptcryx, ii. 245, 253, 260. 



Odmitornithes, ii. 245, 253, 254, 268. 



Odontotmince, ii. 269. 



Odostmnia, ii. 16. 



Ogygia, i. 355, 363, 374, 375. 



Oldhamia, i. 161, 162, 419. 



Olenidce, i. 364. 



OZe?z?<.?, i. 356, 363, 366, 367. 



OUgocha;ta, i. 309. 



Oligopoms, i. 236, 237. 



OZim, ii. 11, 12, 13. 



Olivella, ii. 12. 



Ominastrephes, ii. 90. 



Oviphyma, i. 209, 214. 



Owc/i?<.s ii. 154, 157, 158, 159. 



Oncidiadie, ii. 6. 



Oniscus, i. 388. 



Onychodus, ii. 144. 



Onychopliora, i. 402, 403. 



Ooze, Atlantic, i. 15. 



Operculata, ii. 6, 46. 



Operculina, i. 121. 



OphkUrpeton, ii. 179, 181, 182, 185. 



Ophidia, cliaracters of, ii. 198 ; distri- 

 bution of, in time, ii. 199. 



Ophidioceras, ii. 67. 



Ophileta, ii. 24, 40, 41. 



Ophiocoma, i. 259. 



Ophiodertna, i. 259. 



OpMoglypha, i. 255, 259. 



Ophiolepis, i. 259. 



Ophiomorpha, ii. 174. 



Ophiiira, i. 256. 



Ophiurdla, i. 259. 



Ophinroidea, i. 225 ; characters of, i. 



254-256; distribution of, in time, i. 



256. 

 Oj9/5, i. 501, 502. 

 Opisthohrandiiata, ii. 5, 36. 

 Opisthocmlia (Crocodilia), ii. 209, 213. 

 Opossum, ii. 293, 298. 

 Opjidia, ii. 83. 

 Oracanthus, ii. 159. 

 Orbiculoidea, i. 459. 

 Orbitoides, i. 121. 

 Orhitolites, i. 110. 

 Orhitulidea, i. 106. 

 Orbulina, i. 100, 115. 

 Oirhestia, i. 388. 

 Oreasteo-, i. 252. 

 Oreastridce, i. 248, 249, 252. 

 Oreodmi, ii. 352, 353. 

 OreodonUdcF, ii. 352. 

 Oreopithecus, ii. 421. 

 Oreosaurns, ii. 207. 

 Organic types, succession of, i. 90. 

 Ormoceras, ii. 69. 

 (>n;;<u-yA-/;, ii. 436, 446. 

 Oni)tli,pto-Hs, ii. 225, 229. 

 Omithorhyiidms, ii. 286, 287. 

 Ornithosauria, ii. 222, 228. 

 Ornithoscelida, ii. 229. 

 Orodus, ii. 159, 160. 

 Orohip)ims, ii. 321, 337, 338. 

 Oromeryx, ii. 360. 

 Orozne, i. 344. 



Or</??.s, i. 452, 453, 454, 455. 

 OrtlnshuK i. 452, 454. 

 0/V//,.,r,/x, i. 412; ii. 59, 69, 70. 

 Ortlin,rr,iti<Icc, ii. 58, 69. 

 Orthodesma, i. 484. 

 Orihonema, ii. 16. 

 Orthmiota, i. 484. 

 Orthnptcra, i. 406, 407, 408. 

 Orinnia, i. 311, 312, 313. 

 Osmeroides, ii. 125. 

 Osteolepis, ii. 132, 140, 142. 

 Ostraciontidcp., ii. 130. 

 Ostracoda, characters of, i. 341, 342 ; 



distribution of, in time, i. 343. 

 Ostracostei, ii. 134, 146. 

 Os<rm, i. 469, 471, 472. 

 Ostreidce, i. 468, 471. 

 0/;«r?«, ii. 393. 

 Oto(/?/s, ii. 162. . 

 Otiiznmites, ii. 467. 

 Oi'denodon, ii. 204, 222, 223. 

 Ovarian capsules of Graptolites, i. 164. 

 Ovarian pyramid of Cystideans, i. 288. 

 Owios, ii. 368, 369. 

 Ovuhe,_ ii. 367. 

 Om, ii. 367. 



