710 AND EX. 
Idotea, nervous system of, 286, | Lanyrinraict, 457 
290 Labyrinthodon, 482, 483 
Idyia roseola, 93 Labyrinthodontia, 482 
Iguana, 504 Lacertilia, 501, 517 
Iguanodon, 515 Lachnosterna fusca, 352 
Individuality, 656 Lactophrys trigonus, 462 
Ineducabilia, 582 . Leelaps, 515 
Infusoria, 31, 40 Lagopus leucurus, 546, 546 
Inheritance, law of, 11 Lamellibranchiata, 222 
Insectivora, 587,' 629 ; classification of, 236 
Insects, anatomy of, 308 Lampreys, 409 
brain of, 317 Lamp shells, 146 
characters of, 307, 344 Lancelet, 406 
classification of, 365 Larva of Echinoderms, 178, 187, 
. digestion in, 316 192, 194, 202 
~ ears of, 825 Hydrozoa, 83 
eye of, 325 Insects, 828 
embryology of, 329 Worms, 171 
locomotion in, 327 Lasso-cells in Aurelia, 67 
metamorphosis of, 308 Hydra, 53 
parthenogenesis in, 333 Infusoria, 37 
polymorphism in, 348 Polyps, 76, 81 
respiration of, 323 Sponges, 48 
senses of, 326 Worms, 101 
useful, 334 Lateral line of fishes, 442 
Instinct, nature of, 680 Leaf insect, 657 
Isopoda, 285 Leech, 164 
Isurus punctatus, 420 Lemnisci, 123 
Ixodes albipictus, 341 Lemur, 618 
bovis, 341 Lepas fascicularis, 273 
Lepidoptera, 357, 367 
Jaccuus, 620 Lepidosiren paradoxa, 480 
Jaws, 631 Lepidosteus, development of, 482 
Jelly-fish, 62 osseus, 431 
Julus, 336 platystomus, 432 
spatula, 482 
Kanearoo, 575, 577% Lepidurus Couesii, 282 
Katydid, 676 Lepomonera, 22 
Killer-whale, 595 Leptocardii, 406, 408 
King-bird, 552 Leptocephalus, 446 
King-crab, 297 Leptodiscus medusoides, 34 
Kinglet, 555 Leptoplana, 102 
Kiwi-kiwi, 538 Leptosynapta Girardii, 216 
Kogia Floweri, 594 Leptychaster, 196 
