514 



IJs^DEX. 



Monoceros, *223, 

 Monocondj'lffia, *43-l. 

 Monudcicna, 454. 

 Monoduuta, *265. 

 Monoecious, 40. 

 Monomyary, 402. 

 Monopleui-a, *4;J8. 

 Mono-jDleuro-hranchLata, 



312. 

 Monoptigma, *240. 

 Monoptiymn, 239. 

 Monoptygraa, 313. 

 Monotis, *-il7. 

 MonstrosiLies, 37. 

 Montacuta*460. 

 Montagua, 335. 

 Mopalia, 284. 

 Morio, 225. 

 MoiTisia, *367. 

 Morum, 225. 

 Mouretia, 281. 

 Muliniii, 477. 

 MuUeria, 432, *435. 

 Multispiral operc, 208, 

 Mimsteria, 182. 

 Mui-chisonia, *270. 

 Murex, 23, So, 36, *213. 

 Miu-icidEC, *212. 

 Muscular system, 18, 355, 



401. 

 Musculium, 461. 

 Mutela, 435. 

 Mya, *489. 

 Myacidee, *4S9. 

 Myacites, *-J97. 

 JMyadora, *499. 

 Myalina, *42l. 

 Myatella, 498. 

 Mycetopus, ^^435. 

 Mycetopus, 435. 

 Myochama, *499. 

 Myoconcha, *471. 

 Myonia, *2il. 

 J\Jyoparo, 427. 

 Myoplioria, *431. 

 jVyopsis, 497. 

 Myrina, *423. 

 Myristica, *217. 

 Mysia, 475. 

 Myllita, 459. 

 MytilicardLa, 471. 

 MytilidcE, *420. 

 Mytiliiueria, *422. 

 3Jytiluinya, 423. 

 Mytilus, 30, 31, 43, *420. 

 Myxostoma, 308. 



Nacca, 235. 

 Nacella, *280. 

 Nacreous sliells, 29. 

 Nanina,2^0. - 

 Naranio, 476. 

 Narica, *237. 

 Nassa, *221. 

 Xatica, 38, *235. 

 JS'uticella, 23(5. 

 Natieidse, *235. 

 Naticina, *23f3. 

 Naticopsis, *235. 



Natural barriers, 53. 



Nai ural histoiy provinces, 



60—54. 

 Nautilidje, *185. 

 Aautiloccras, 194. 

 Nautilus, 161. 

 ]N'autiiu.s, 55, 185. 

 Navicella, *262. 

 Kecera, *491. 

 Neda, *323. 

 Aeilo, 429. 

 Neithea, *412. 

 Is ematura, *2o6. 

 Nerin^a, *244, 314. 

 Nerinella, *244. 

 Nerita, 38, 55, *260. 

 Neritid.fi, 36, *2e0. 

 Neritina, 37, *261. 

 Neritoma, *261. 

 Neritopsis, *261. 

 Nervous sj'stem, 16. 

 Nets, 139. 

 Neverita, 236. 

 New Zealand shells, 104. 

 Nidamental ribbon, 40. 

 Niplionia, 267. 

 Niso, *240, 

 Aveiia, 427. 

 Nomenclature, 48. 

 Northia 221, 

 Notarchus, *321. 

 Nothoceras, *195. 

 Notocoeli, *i74. 

 Notomya, 469. 

 Novaculiua, *4S9. 

 Nucinella, 427, 

 Nudeubranchiata, 340. 

 Nucleus, 205. 

 Nucula, *426. 

 JVucu/a, *497. 

 Nuculina, *427. 

 Nucu7iella, 427. 

 Nudibranchiata, *325. 



Obehscus, 238. 

 Obolus, *892. 

 Octopoda, *158. 

 Octopodoteuthis, 171. 

 Octopus, 66, *163. 

 Ocythoe, 161. 

 Odoncinetus, 495. 

 Odontidium, 2 J 9. 

 Odontostomus, *291. 

 Odostomia, *2S9. 

 Oleacina, 292. 

 Oliqyra, 310. 

 Oliva, 32, 65, *227. 

 Olivancillaria, 227. 

 Olivella, *227. 

 Olivia, 265. 

 Oinala, 480. 

 OmalaTis, 253. 

 Omalia, 475. 

 Omalonj-x, *291. 

 Omma^trephes, *172. 

 Oniphalotropis, 307. 

 Oncidiadje, *299. 

 Oncidium, *29il. 

 Oncidoris, *329. 



Oncoceras, *193. 

 Oaiscia, *225. 

 Onustus. 254. 

 (onychia, 171. 

 Cnychochi'un, 284. 

 O: ychoteu Ills, *171. 

 Operculata, *305. 

 Operculum, 38, 182, 237. 

 Ophileta, 267. 

 Opis, *470. 



Opistho-brancliia, *311. 

 Opisthophorus, *309. 

 Orbicelia, 389. 

 Orbicula, 358, 386, 383. 

 Orbiculoidea, 388. 

 Orbis, ^253. 

 Orbidites, 187, 

 Oregon, shells of, 109. 

 Ormoceras, *191. 

 Ornati, n98, 

 Ortkambondes, 380. 

 Orthid^, ^379. 

 orthis, *380. 

 Orthisina, *3S0, 

 Orthoceras, 38, *190. 

 Orthoceratidffi, *190. 

 Orihona, 336. 

 Orthonotus, M23. 

 Orthotkrix, 385. 

 0.-,canius, 322. 

 Usteodesma, 495. 

 Ostrea, 31, *407. 

 Ostreidce, *-407. 

 Otina, *238. 

 Otolithes, 17. 

 Otopoma, *307. 

 Oviducts, 359. 

 Oviparous repr., 40. 

 Ovulum, 27, *234. 

 Ovum, 41. 

 Owcnia, 169. 

 Oxygyrus, *344. 

 Oyster shell, 31. 



Pachydomus, *469. 

 Pachylabra, 258. 

 Puchymya, 492. 

 Pachyudun, 434, 470. 

 Pachyotis, 291. 

 Pachyrisma, *470. 

 Pddiytcs, 414. 

 Pachytoma, 310. 

 Pacijodon, 490. 

 Padollus, 268. 

 Pagodella, 252. 

 Pa'laoteuthis, 177, 182. 

 Pallial impression, 20. 

 Pallial line, 404. 

 Pallial sinus, 404. 

 Pallio-branchiata, 354. 

 Pallium, * 412. 

 Paludestrina, 254. 

 Paludina,27,37, *257,286. 

 Paludinella, 256. 

 Paludinidce, *257. 

 Paludomus, *247. 

 Panama shells, 81. 

 Pauamic province, 79. 

 Pancreas, 23. 



