652 
Malleus alba, 362. 
Malleus alba, 362. 
x vulgaris, 363. 
Mantle in Molluscs, its uses, 318. 
Marennes Oysters, 395. 
Mean depth of the sea, 1-3. 
Meandrina cerebriformis, 184. 
Meandrina cerebriformis, 181. 
Mediterranean Sea, 6 
Meduside, 156. 
Meleagrina margaritifera, 364. 
Meleagrina margaritifera, 364, 365. 
Merlangus vulgaris (Whiting), 621. 
Millepora alcicornis, 189. 
Millepora alcicornis, 190. 
Minyadide, 216. 
Minyas cerulea, 217. 
Mitra episcopalis and M. papalis, 445. 
Mitra episcopalis, 446. 
», papalis, 446. 
Molluscoida, 302. 
Mollusca, 300. 
Mollusca, 316. Their characteristics, 2. 
Monad twilight, 100. 
Monas lens, 101. 
Monodonta australis, 435. 
"9 labia, 436. 
Monodonta australis and M. labia, 435. 
Monsoons, 30. 
Montfort, Denis de, on the Kraken, 485. 
Moon-fish (Orthagoriscus mola), 559. 
Morrhua vulgaris (Cots 614, 
Morrhua vulgaris, 615. 
Mounts Erebus and Terror, 50. 
Mounts Erebus and Terror, 51. 
Mullet (Mullus), 622. A Roman luxury, 
623. 
Murzena, 576. 
Pr ponds, a passion with Roman 
patricians, 577: 
Murex erinaceus, 460. 
»,  Aaustellum, 459. 
+» scorpio, 460. 
‘3, tenuispina, 459. 
Murex scorpio and M. erinaceus, M. 
tenuispina and M. haustellum, 458. 
Muschelkalk rocks, 264, 
Mussels, 354. Organisation of, 355. 
Habits, 26. 
Mussels of Aiguillon Bay, 361. 
Mussels, piles covered with spawn of, 359. 
i piles covered with, 360. 
M. vulgaris, 2d, 
Organisation, 303. 
THE OCEAN WORLD. 
Mytilus byssus, 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, 37. 
Noctiluca miliaris, 87. 
Nummutlina perforats, 84. 
Nummulites, 80. 
Nummutites Rouaulti, 81. 
Octopus brevipes and O. horridus, 490. 
Macropus vulgaris, 491. 
Octopus brevipes, 491. 
»,  horridus, 491. 
»»9. macropus, 491. 
», vulgaris, 490. 
Oculina flabelliformis, 178. 
Oculina virginea, 173, 
Olaiis Magnus on the Kraken, 485. 
Oliva erythrostoma, 450. 
»>  @isans,-450. 
3» peruviana, 450. 
>, porphyria, 450. 
Oliva erythrostoma, O. porphyria, O. 
irisans, and O. peruviana, 453. 
Operculina, 85.° 
Ophiocoma Riisei, 271. 
Ophiocoma Ritsei, 271. 
Ophiurade, 269. 
Orbulina universa, 84, 
Organisation of Foraminifera, 79. 
a ‘Infusoria, 91. 
Sponges, 60, 
+ Star-fishes, 254. 
Orthagoriscus mola, 558. 
Ostracion, 561. 
Ostreadz (the Oyster), 372. 
Ovulum cornea 445. 
>»  oviformis, 445. 
»»  wvolva, 445. . 
Oyster (Ostrea), 372. Its organisation, 
A Reproduction, 375. Incubation, 
0. 
Ovsters, group of, 377. 
Ovulum oviformis, O. cornea, O. volva, 
445. 
