514 



T^^DEX. 



Monoceros, *223. 

 Monocondyleea, *434. 

 Monodacna, 454. 

 Monodonta, *265, 

 Monoecious, 40. 

 Monomyary, 402. 

 Monopleura, *438. 

 Mono-pleuro-l»ranchiata, 



312. 

 Monoptigma, *240. 

 Monoptigma, 239. 

 Monoptygina, 313. 

 Monotis, *417. 

 Monstrosities, 37. 

 Montacuta,*460. 

 Montagua, 335. 

 MopHlia, 2S4. 

 Morio, 225. 

 Morrisia, *367. 

 Morum, 225. 

 Mouretia, 281. 

 Mulinia, 477. 

 MuUeria, 432, *435. 

 Multispiral operc, 208. 

 Munsteria, 182. 

 Murchisonia, *270. 

 Murex, 23, 35, 36, *213. 

 Mm-icidze, *212. 

 Muscular system, 18, 355, 



401. 

 Musculium, 461. 

 Mutela, 435. 

 Mya, *489. 

 Myacidae, *4S9. 

 Myacites, *J97. 

 Myadora, *499. 

 Myalina, *421. 

 Myatella, 498. 

 Mycetopus, *435. 

 Mycetojms, 435. 

 Myochama, *499. 

 Myoconcha, *471. 

 Mj'onia, *2J1. 

 iHyoparo, 427. 

 Alyophoria, *431. 

 Myopsis, 497. 

 Myrina, *423. 

 MjTistica, *217. 

 Myxia, 475. 

 Myllita, 459. 

 Mytilicardia, 471. 

 Mytilidffi, *420. 

 Mj'tilimeria, *422. 

 Mytilomya, 423. 

 Mytilus, 30, 31, 43, *420. 

 Myxostoma, 308. 



Nacca, 235. 

 Nacella, *280. 

 Nacreous shells, 29. 

 Nanina, 290. 

 Narunio, 476. 

 Nai-ioa, *237. 

 Nassa, *221. 

 Xatica, 38, *235. 

 Naticella, 236. 

 Naticidee, *2.35. 

 Naticina, *236. 

 Naticopsis, *235. 



Natural barriers, 53. 

 Nutural history provinces, 



50—54. 

 NautilidEe, *185. 

 A'autiloceras, 194. 

 Nautilus, 161. 

 Nautilus, 55, 185. 

 Navicella, *262. 

 Nesera, *491. 

 Neda, *323. 

 Neilo, 429. 

 Neithea, *412. 

 Nematui-a, *256. 

 Nerineea, *244, 314. 

 Nerinella, *2'i4. 

 Nerita, 38, 55, *260. 

 Neritidae, 36, *260. 

 Neritina, 37, *261. 

 Neritoma, *261. 

 Neritopsis, *261. 

 Nervous system, 16. 

 Nets, 139. 

 Neverita, 236. 

 New Zealand shells, 104. 

 Nidamental ribbon, 40. 

 Niphonia, 267. 

 Niso, *240, 

 Noetia, 427. 

 Nomenclature, 48. 

 Northia 221. 

 Notarchus, *321. 

 Notlioceras, *195. 

 Notocoeli, *174. 

 Nntomya, 469. 

 Novaculina, *489. 

 Nacinella, 427. 

 Nucleobranchiata, 340. 

 Nucleus, 205. 

 Nucula, *426. 

 Nucula, *497. 

 Nuculina, *427. 

 Nucunella, 427. 

 Nudibranchiata, *325. 



Obeliscus, 238. 

 Obolus, *392. 

 Octopoda, *158. 

 Octopodoteuthis, 171. 

 Octopus, 56, *163. 

 Ocythoe, 161, 

 Odoncinetus, 495. 

 Odontidiinn, 249. 

 Odontostomus, *291. 

 Odostomia, *239. 

 Oleacina, 292. 

 Oligyra, 310. 

 Oliva, 32, 55, *227. 

 Olivancillaria, 227. 

 Olivella, *227. 

 Olivia, 265. 

 Omala, 480. 

 Omalaxis, 253. 

 Omalia, 475. 

 Omalonyx, *291. 

 Ommastrephes, *172. 

 Omphalotropis, 30''. 

 Oncidiadae, *299. 

 Oncidium, *299. 

 Oncidorjs, *329. 



Oncoceras, *193. 

 Ouiscia, «i!jl."). 

 Onustus, 254. 

 Ony cilia, 171. 

 Cnychochi^on, 284. 

 Oi ychoteu his, *171. 

 Operculata, *305 

 Operculum, 38, 182, 237. 

 Ophileta, 267. 

 Opis, *470. 



Opistho-branchia, *311. 

 Opisthophorus, *309. 

 Orbicelta, 389. 

 Orbicula, .358, 386, 388. 

 Orhiculoidea, 388. 

 Orbis, '^253. 

 Orbiilites, 187. 

 Oi'egon, sliells of, 109. 

 Ormoceras, *191. 

 Ornati, *198. 

 Orthnmbonites, 380. 

 Orthidse, ♦379. 

 Orthis, «380. 

 Orthisina, *380. 

 Orthoceras, 38, *190. 

 Orthoceratidae, *190. 

 Orthona, 336. 

 Orthonotus, *423. 

 Orthothrix, 385. 

 O.'^canius, 322. 

 Osteodesma, 495, 

 Ostrea, 31, *407. 

 Ostreidae, *407. 

 Otina, *238. 

 Otolithes, 17. 

 Otopoma, *307. 

 Oviducts, 359. 

 Oviparous repr., 40. 

 Ovulum, 27, *234. 

 Ovum, 41. 

 Owenia, 169. 

 Oxj'-gyrus, *344. 

 Oyster shell, 31. 



Pachydomus, *469. 

 Pacliylabra, 258. 

 Pachymya, 492. 

 Puchyodon, 434, 470. 

 Pachyotis, 291. 

 Pachyrisma, *470. 

 Pachytes, 414. 

 Pachytoma, 310. 

 Pacyodon, 490. 

 Padollus, 268. 

 Pagodella, 252. 

 PaliEoteitthis, 177, 182. 

 Pallia', impression, 20. 

 PaUial line, 404. 

 Pallial sinus, 404. 

 Pallio-branchiata, 354. 

 Pallium, *412. 

 Paludestrina, 254. 

 Paiudina, 27,37, *257, 29A 

 Paludinella, 256. 

 Paludinidae, *257. 

 Paludomus, *247. 

 Panama shells, 81. 

 Panamic province, 79, 

 Pancreas, 23. 



