612 



INDEX. 



Ichthyodorulites, 361, 372, 379. 



Ichthyomorpha, 384. 



Ichthyophthira, 198, 199. 



Ichthyopsida, 338. 



Ichthyopterygia, 397; characters of, 416. 



Ichthyosauria, 416. 



Ichthyosaurus, 416, 417. 



Iguana, 408, 412. 



Iguanidce, 412. 



Iguanodon, 421, 422. 



Ilyanthidce, 113. 



Ilyanthus, 113. 



Imago, 239, 240. 



Imperforata (Foraminifera), 51, 54. 



Implacentalia (Mammalia), 484. 



Individuality, general definition of, 25, 77 ; 

 in Sponges, 65. 



Infundibulum, of Cephalopoda, 299, 300. 



Infusoria, spontaneous generation of, 35, 

 36 ; characters of, 66 ; divisions of, 66 ; 

 affinities of, 72 ; Ciliated, 66 ; Suctorial, 

 71 ; Flagellate, 71 ; compared with Eo- 

 tifera, 176. 



Inia, 511. 



Innocua (Ophidia), 406. 



Inoceramus, 284. 



Inoperculata, 294, 296. 



Insecta, 191, 233 ; general characters of, 

 233-241 ; organs of the mouth of, 235 ; 

 wings of, 234 ; digestive system of, 236 ; 

 tracheae of, 238 ; circulation of, 237 ; 

 metamorphoses of, 239; parthenogene- 

 sis of, 30, 31 ; sexes of, 240 ; orders of, 

 241 ; distribution of, in time, 252. 



Insectivora, 484, 488; general characters 

 of, 549; families of, 550; distribution of, 

 in time, 568. 



Insessores, 443 ; characters of, 458 ; sec- 

 tions of, 460. 



Integro-pallialia, 282, 283, 284. 



Invertebrata, general characters of, 324, 

 325. 



Ischiodus, 372, 380. 



Isis, 116, 122. 



Isocardia, 285. 



Isopoda, 198; characters of, 212; distri- 

 bution of, in time, 220. 



lulus, 232. 



Ixodes, 226. 



JAGUAR, 541. 



Jelly-fishes, urticating powers of, 76 ; na- 

 ture of, 97, 98 ; former classification of, 

 95, 96. 



Jerboa, 545. 



KANGAROO, 493. 

 Kangaroo-rat, 493, 494. 

 Kellia, 285. 

 Keratode, 60. 

 Keratosa (Sponges), 63. 

 King-crabs, 209, 210, 222. 

 Kinkajou, 535, 536. 

 Koninckia, 274. 

 Koninckiadce, 274. 



LABIUM, of Lobster, 197 ; of Arachnida, 



222; of Insecta, 236. 

 Labrum, of Lobster, 197 ; of Trilobita, 



208 ; of Scorpion, 222 ; of Insecta, 235, 



236. 

 Labyrinthodontia, 391, 392. 



Lacerta, 411. 



Lacertidce, 411. 



Lacertilia, 387, 397 ; general characters of, 

 408, 409 ; families of, 409-413 ; distribu- 

 tion of, in time, 413. 



Lcemodipoda, 198; characters of, 211, 212. 



Lagena, 52. 



Lagopus, 454. 



Lamellibranchiata, 253, 254 ; general 

 characters of, 278-283; shell of, 279; 

 digestive system of, 280; circulatory 

 system of, 281 ; mantle of, 280 ; bran- 

 chiae of, 281 ; reproduction of, 282 ; 

 muscles of, 282; habits of, 283; divi- 

 sions of, 283 ; families of, 284, 285 ; dis- 

 tribution of, in time, 312. 



Lamellirostres, 446. 



Lamprey, 350, 355, 356, 357. 



Lamp-shells, 271. 



Lancelet, 334, 336, 341 ; anatomy of, 353- 

 355. 



Land-salamanders, 387. 



Laniidce, 461. 



Laomedea, 88. 



Laridce, 445. 



Lark, 460, 461. 



Larva, of Echinodermata, 136, 137; of 

 Echinoidea, 138 ; of Asteroidea, 146 ; 

 of Ophiuroidea, 147 ; of Crinoidea, 149 ; 

 of Holothuroidea, 153 ; of Tceniada, 161, 

 162,163; ofTrematoda,164; ofNemer- 

 tida, 167 ; of Acanthocephala, 168 ; of 

 Ichthyophthira, 199; of Cirripedia, 201 ; 

 of Brachyura, 217 ; of Limulus, 211; of 

 Myriapoda, 231 ; of Insecta, 239, 240 ; 

 of Tunicata, 269 ; of Brachiopoda, 273 ; 

 of Lamellibranchiata, 282; of Gastero- 

 poda, 289. 



Leech, 181. 



Lemuridce, 553. 



Leopard, 541. 



Lepadidce, 198, 200 ; characters of, 202 ; 

 distribution of, in time, 220. 



Lepas, 201. 



Lepidoganoidei, 367, 378. 



Lepidoptera, 247 ; mouth of, 236 ; charac- 

 ters of, 247. 



Lepidosiren, 351,352,356; characters of, 

 375-377. 



Lepidosteus, 342, 365, 367. 



Lepidota, 384 (see Dipnoi). 



Lepisma, 242. 



Leporidce, 543. 



Leptcena, 274. 



Leptocardia, 353 (see Pharyngobranchii). 



Lepus, 543. 



Lernoea, 34, 199. 



Libellulidee, 244. 



Lieberkuhnla, 50. 



Ligula, 236. 



Limacidce, 294, 296. 



Limacina, 298. 



Limacinidce, 298. 



Limax, 256, 296. 



Limnadia, 207. 



Limncea, 296, 313. 



Limnceidce, 294, 296. 



Limnoria, 213. 



Limulus, 209, 210, 211, 220. 



Lingua (Insects), 236. 



Lingual Ribbon (Mollusca), 287. 



Linguatulina, 225. 



