INDEX 



555 



Meleagrina margaritifera, 280. 



Membrane, branchiostegal, 396 ; nic- 

 titating, 435 ; tympanic, 408, 435 ; 

 undulating, 50. 



Menopoma, 433. 



Merostomata, 260. 



Mesentery, 115, 347, 507. 



Mesoglaea, 94. 



Mesopodium, 290. 



Metacarpus, 342. 



Metacrinus interruptus, 177. 



Metagenesis, 98. 



Metameres, 189. 



Metamorphosis, of Crustacea, 235 ; of 

 frog, 429 ; of insects, 251 ; retro- 

 grade, of ascidians, 320. 



Metapleure, 323. 



Metapodium, 290. 



Metatarsal bones, 504. 



Metatarsus, 342. 



Metatheria, 525. 



Metazoa, 19, 59. 



Metridium marginatum, 117. 



Mice, 526. 



Micraesthetes, 282. 



Microgamete, 44. 



Micronucleus, 45. 



Miliola, 22. 



Milk, pigeon's, 483. 



Mill, gastric, of crawfish, 220. 



Millepora, 104. 



Mite, 260; itch, 260. 



Mole, 526, 542. 



Molar teeth, 505. 



Mollusca, 264; characters of, 364; 

 naked, 291, 296. 



Molluscoidea, 184. 



Monkey, 543. 



Monocystis agilis, 55, 56. 



Monotremata, 525. 



Monosiga, 39. 



Mordacia, 365. 



Morphology, 4. 



Mound-maker bird, 491. 



Mouth, 92; of fishes, 368, 374; of 

 fluke-worms, 130 ; of frog, 408, 417. 



Mud-fish, 405. 



Multicilia, 49. 



Muscle, adductor, of bivalve shells, 



268, 271. 

 Muscle, of birds, 472; of vertebrates, 



342. 

 Mussel, fresh water, 265, 270, 273, 



274 ; brain of, 276 ; nervous system 



of, 276 ; sea, 279. 

 Mustelus anarcticus, 366 ; canis, 366 ; 



vulgaris, 366. 

 Mya arenaria, 279. 

 Myomeres, 342. 

 Myriapoda, 239. 

 Myrmecophaga, 531. 

 Mytilus edulis, 279. 

 Myxine, 360; glutinosa, 362, 364. 

 Myxospongiae, 86. 



Nacre of shell, 269. 



Naked molluscs, 291, 296. 



Name, generic, 2 ; specific, 2. 



Nares, 347, 417, 425, 505; of mam- 

 mals, 496. 



Nauplius, 233. 



Nautilus pompilius, 298, 300, 306, 309. 



Nectocalyces, 105. 



Necturus, 433. 



Nematelminthes, 149. 



Nematocysts, 52, 95, 96. 



Nematoda, 149. 



Nematodes, 154. 



Nemertean worms, 145. 



Nemertinea, 145. 



Nephridia, of Amphioxus, 327; of 

 annelids, 196; of leech, 207, 208; 

 of molluscs, 275, 283, 295, 308. 



Nephridiopores, 203. 



Nephrostomes of frog, 427. 



Nereis dumerilii, 189, 192, 194; 

 virens, 189. 



Nerve cord of Amphioxus, 328. 



Nerve-pentagon, 162. 



Nerves, 71 ; auditory, 356; cranial, 

 356; cerebral, 356; hypoglossal, 

 425 ; olfactory, 356, 381 ; optic, 356, 

 381,517; peripheral, 355. 



Nervous system, of annelids, 195; of 



