6 5 2 



THE OCEAN WORLD. 



Malleus alba, 362. M. vulgaris, ib. 

 Malleus alba, 362. 



vulgaris, 363. 

 Mantle in Molluscs, its uses, 318. 

 Marennes Oysters, 395. 

 Mean depth of the sea, I -3. 

 Meandrina cerebriformis, 184. 

 Meandrina cerebriformis, 181. 

 Mediterranean Sea, 6. 

 Medusidae, 156. 

 Meleagrina margaritifera, 364. 

 Meleagrina margaritifera, 364, 365. 

 Merlangus vulgaris (Whiting), 621. 

 Millepora alcicornis, 189. 

 Millepora alcicornis, 190. 

 Minyadidse, 216. 

 Minyas ccerulea, 217. 

 Mitra episcopalis and M. papalis, 445. 

 Mitra episcopalis, 446. 



,, papalis, 446. 



Molluscoida, 302. Organisation, 303. 

 Mollusca, 300. 



Mollusca, 316. Their characteristics, ib. 

 Monad twilight, 100. 

 Monas lens, 101. 

 Monodonta australis, 435. 



labia, 436. 



Monodonta australis and M. labia, 435. 

 Monsoons, 30. 



Montfort, Denis de, on the Kraken, 485. 

 Moon-fish (Orthagoriscus mola), 559. 

 Morrhua vulgaris (Cod), 614. 

 Morrhua vulgaris, 615. 

 Mounts Erebus and Terror, 50. 

 Mounts Erebus and Terror, 5 1 . 

 Mullet (Mullus), 622. A Roman luxury, 



623. 

 Mursena, 576. 



,, ponds, a passion with Roman 



patricians, 577. 

 Murex erinaceus, 460. 



,, haustellum, 459. 



,, scorpio, 460. 



,, tenuispina, 459. 

 Murex scorpio and M. erinaceus, M. 



tenuispina and M. haustellum, 458. 

 Muschelkalk rocks, 264. 

 Mussels, 354. Organisation of, 355. 



Habits, ib. 



Mussels of Aiguillon Bay, 361. 

 Musstls, piles covered with spawn of t 359. 

 ,, piles covered with, 360. 



Mytilus byss^ls^ mantle and oviduct of\ 



356. 



Mytilus edulis, 354. 

 Mytilus edulis, 354- 



Nautilus pompilius, 471, 472, 473 

 Nautilus pompilius, 472. 

 Nephthya, 246. 

 Nephrops norvegicus, 523. 

 Nephrops, 524. 

 Noctiluca miliaris, 87. 

 Noctiluca miliaris, 87. 

 Nummulina perforata, 84. 

 Nummulites, 80. 

 Nummulites Rouaulti, 81. 



Octopus brevipes and O. horridus, 490. 



Macropus vulgaris, 491. 

 Octopus brevipes, 491. 

 ,, horridus, 491. 

 ,, macropus, 491. 

 ,, vulgaris, 490. 

 Oculina flabelliformis, 178. 

 Oculina virginea, 178. 

 Olaiis Magnus on the Kraken, 485. 

 Oliva erythrostoma, 450. 

 ,, irisans, 450. 

 ,, peruviana, 450. 

 , , porphyria, 450. 

 Oliva erythrostoma, O. porphyria, O. 



irisans, and O. peruviana, 453. 

 Operculina, 85. 

 Ophiocoma Riisei, 271. 

 Ophiocoma Riisei, 271. 

 Qphiuradas, 269. 

 Orbulina universa, 84, 

 Organisation of Foraminifera, 79. 

 ,, Infusoria, 91. 



,, Sponges, 66. 



,, Star-fishes, 254. 



Orthagoriscus mola, 558. 

 Ostracion, 561. 

 Ostreadse (the Oyster), 372. 

 Ovulum cornea 445. 

 ,, oviformis, 445. 

 volva, 445. 



Oyster (Ostrea), 372. Its organisation, 

 ib. Reproduction, 375. Incubation, 

 ib. 



Oysters, group <?/J 377. 

 Ovulum oviformis, O. cornea, O. volva, 

 445- 



