694 INDEX. 



Hydroida, characters and divisions of, 

 91 ; reproduction of, 94, 97 ; distin- 

 guished from Polyzoa, 298, 299. 



Hydroid Zoophites (see Hydroida). 



Hydrophidce, 459. 



Hydrophilidce, 276. 



Hydrophyllia, 105, 107. 



Hydrorhiza, 91. 



Hydrosoma, 89. 



Hydrotheca, 93, 98. 



Hydrozoa, 86, 88, 89, 90 ; characters of, 

 88; terminology of, ib. ', divisions of, 

 90 ; reproductio'n of, 94, 97 ; Oceanic, 

 103 ; distribution of, in space and time, 

 123. 



Hyla, 432, 439. 



flylobates, 636. 



Hymenocaris, 253. 



Ilymenoptera, 275, 287, 238. 



Hyoid arch (Fishes), 390, 391. 



Hyopotamus, 645. 



Hyperodapedon, 467. 



Hyperoodon, 579. 



Hypochthon, 435. 



Hyponome, 175. 



Hypostome, of Trilobites, 238. 



Hypsiprymnus, 559, 561. 



Hyracoidea, 553 ; general characters of, 

 599. 



Hyrax, 553, 599. 



Uystr.cidce, 619. 



Hystrix, 619. 



lanthina, 310. 



Ibis, 510, 



Ichneumon (Insecta), 288. 



Ichthyodorulites, 409, 420, 430. 



Ickthyomorpha, 435. 



Ichtht/ophthira, 225, 227. 



Ichthyopsida, 384. 



Ichthyopterygia. 448 ; characters of, 471, 

 472. 



Ichthyornis, 535. 



Ichthyosauria, 471. 



Ichthyosaurus, 472, 473. 



Idothea, 245. 



Iguana, 461, 465, 473. 



Iguanidce, 465. 



Iguanodon, 478. 



Ilyanthidce, 129. 



Ilyanthus, 129. 



Imago, 274. 



Imperforata (Foraminifera), 59, 63. 



Implacentalia (Mammalia), 550. 



Individuality, general definition of, 23 ; 

 in Sponges, 76. 



Infundibulum, of Cephalopoda, 345. 



Infusoria, spontaneous generation of, 3?, 

 39 ; characters of, 76 ; divisions of, 7" ; 

 affinities of, 84 ; Ciliated, 77 ; Suctorh^ 

 1 2 ; Flagellate, 83 ; compared with 

 Rotifera, 202. 



Jnia, 579. 



Innocua (Ophidia), 458. 



Inoceramus, 327. 



Inoperculata, 338, 341. 



Insecta, 218 ; general characters of, 267, 

 et seq. ; organs of the mouth of, 270 ; 

 wings of, 270; digestive system of, 

 271; tracheae of, 272; circulation of, 

 273 ; metamorphoses of, 274 ; partheno- 

 genesis of, 32, et sey. ; sexes of, 275 ; or- 



ders of, 257, et seq. ; distribution of, in 

 time, 292. 



Insectivora, 550 ; 554 ; general characters 

 or, 626 ; families of, 627 ; distribution 

 of, in time, 648. 



Insessores, 501 ; characters of, 522 ; sec- 

 tions of, 523. 



Integro-pallialia, 324, 326, 327. 



Jnuus, 635. 



Invertebrata, general characters of, 370, 

 371. 



Ischiodus, 421, 430. 



/*'*, 132, 139. 



Isocardia, 328. 



Isopoda, 226 ; characters of, 244 ; develop- 

 ment of, 245 ; distribution of, in time, 

 254. 



lulidce, 266. 



lulus, 266. 



Ixodes, 260. 



Ixodidce, 260. 



JAGUAR, 616. 



Jelly-fishes, urticating powers of, 11^ ; 



nature of, 112 ; former classification of, 



110. 



Jerboa, 621. . 

 Jer-falcon, 488. 

 Jumping Hare, 621. 

 Jumping Mouse, 626. 



KANGAROO, 557, 559, 560. 

 Kangaroo-rat, 559, 561. 

 Kellia, 328. 

 Keratode, 70. 

 Keratosa (Sponges), 74. 

 King-crabs, 240, 241. 

 Kinkajou, 609. 

 Koala, 560. 

 Xoninckia, 316. 

 Koninckiadiv, 316. 



LABIUM, of Lobster, 224 ; of Arachnida, 

 255 ; of Insecta, 270, 271. 



Labrum, of Lobster, 224 ; of Trilobites, 

 238; of Scorpion, 255; of Insecta, 270. 



Labyrinthodontia, 442, 443. 



Lacerta, 461. 



Lacertidce, 464. 



Lacertilia, 433. 448 ; general characters 

 of, 4tiO ; families of, 462 ; distribution 

 of, in time, 466. 



La'/modipoda, 226 ; characters of, 243. 



Lagena, 61. 



Lagomys, 619. 



Lagopus, 516. 



Lamellibranchiata, 293, 295 ; general 

 characters of, 320 ; shell of, 3^1 ; -di- 

 gestive system of, 323 ; circulatory 

 system of, 32 1 ; mantle of, 323 ; bran- 

 c'hia? of, 324 ; reproduction of, S25 ; 

 muscles of, ib. ; habits of, 326 ; divi- 

 sions of, ib. ; families of, 327, et seq. ; 

 distribution of, in time, 359. 



Lamellirostres, 505. 



Lamprey, 396, 402, 403, 404. 



Lamp-shells, 312. 



Lancelet, 372, 380, 3S2, 393, 397, 400 ; 

 anatomy of, 400, 401. 



Land-salamanders, 438. 



Laniidv, 526. 



Laomedea, 103. 



