INDEX 



529 



Hybrid, 10. 



Hydatina, 127. 



Hydra, 497. 



Hydractima, 64. 



Hydra viridis, co ; //. vulgaris, 66. 



Hydridae, 65, 451. 



Hydromedusae, 67. 



Hydrophyllium, 70, 71. 



] [ydrotheca, 63. 



1 l\<lrozoa, 61. 



1 lyenas, 402. 



pickeringii, 306. 



I lylidas, 306. 

 Hymenoptera, 221, 226, 227, 424. 



I I void, of frog, 300. 

 Hyperammina elongata, 450. 

 I [ypotricha, 47. 



1 [yracoidea, 385. 

 HyraA syriacus, 377, 385. 

 Hystrieomorpha, 390. 

 Hystrix cristata, 391. 



Ibises, 342. 



Ichneumon, 403. 



Ichneumon flies, 222. 



Ichthiopsida, 311. 



Ichthyopterygia, 426. 



Ichthyornis victor, 430, 431. 



Ichthyornithae, 429, 431. 



Ichthyosaurus communis, 426. 



Idyia roseola, 82. 



[guana, 314. 



Iguanodon lernissartensis, 310, 311, 427. 



Ilio-ischiatic foramen, of fowl, 331. 



Ilium, of fowl, 331 ; of frog, 300, 301 ; of 



Mammalia, 358,359; of pigeon, 333. 

 Imago, 196. 

 Imitation, 492. 



Immutability of species, 501, 505. 

 Impennes, 341, 452. 

 Incomplete metamorphosis, in insects, 



196. 

 Incubation of birds' eggs, 335. 

 Indian antelope, 384. 

 Indian elephant, 385, 454. 

 Indian rhinoceros, 379. 

 Indigo snake, 318. 

 Infundibular cartilage, 252. 

 Infusoria, 44. 



Ingestion, definition of, 21. 

 Inheritance of variations, 477. 

 Ink sac, of Cephalopoda, 252; of Dibran- 



chiata, 255. 

 Insecta, 192, 420, 451, 452. 

 Insectivora, 392, 435. 

 Instinct, definition of, 483; examples of, 



483, 484; origin of, 485. 

 Instinctive actions, 483. 

 Insulation of germ-cells, 476. 



Intelligence, 486, 4R7 ; in ants, 4S8 ; in 



wasps, 488 ; of cells, 482. 

 Interambulacral ossicles, 102. 

 Interambulacral plates, 98. 

 Interfemoral m 394. 



Interorbital septum, ol pigeon, 333. 

 Intervertebral ligaments, 358. 

 Introvert, 143. 

 Invertebrata, 270. 

 Irish elk, 440. 

 Irregular distribution, 455. 



hium, ot fowl, 331; of frog, 301; of 



Mammalia, 358, 359. 

 Isinglass, 285. 

 Island faunae, 454, 456. 

 Isolation, 468 ; of germ-cells, 476. 

 Isopoda, 161, 450, 451. 

 Isoptera, 226, 227. 

 Isospores, 31, 32. 

 Itch mite, 184, 185. 

 lulus tcrrestris, 191. 



Jackal, 401. 

 Jackass hares, 392. 

 lack rabbits, 392. 

 Jaguar, 404. 

 Janssen, 498. 



355- 

 Jellyfishes, see Medusae; fossils of, 417. 

 Jerboas, 389. 

 Jointed worms, 134. 

 Jugular plate, 285. 

 Jugular vein, of lamprey, 273. 

 Jumping hare, 389. 

 Jumping shrews, 393. 

 Jungle fowls, 350. 

 Jurassic period, 13, 443. 



Kallima par ale da, 464. 



Kangaroos, 367. 



Kant, 503. 



Katabolism, definition of, 22. 



Katydid, 202. 



Keel, of sternum, of fowl, 331. 



Keyhole limpets, 234, 236. 



Kidney, of pigeon, 333; of Mammalia, 



361. 

 Killers, 374. 

 Kingbirds, 354. 

 King crab, 173, 424. 

 Kingfishers, 348. 

 King of termites, 200, 201. 

 King penguin, 341. 

 King salmon, 291. 

 King vulture, 345. 

 Kingdom Animalia, 9. 

 Kites, 346. 



Kitten, play of, 489,490. 

 Kiwis, 340. 



2 M 



