INDEX. 



821 



ters of, 509 ; development of, ib. 



respiratory organs of, 510 ; orders of, 



513-524 ; distribution of, in time, 524. 

 Amphicoelia (Crocodilia), 558. 

 Amphidiscs, 90. 

 Amphilestes, 653. 

 Amphimoschus, 722. 

 Amphinomidce, 267. 

 Amphwxus, 474, 477, 478. 

 Amphipneusta, 515. 

 Amphipoda, 283, 302; characters of, 303; 



heart of, 303. 

 Amphisbcena, 545, 547. 

 A mphisbcenidce, 547. 

 Amphitherium, 653, 669. 

 Amphitragulus, 722. 

 Amphiuma, 512, 515, 517. 

 Amplexus, 175. 

 Ampullaria, 408, 416. 

 Anacanthini, 486. 

 Anaconda, 543. 

 Anallaritoidea, 458. 

 Analogy, 23. 

 Anamniota, 458. 

 Anarthropoda, 228, 254. 

 Anas, 606. 

 Anatidce, 605. 

 Anatinidce, 404. 

 Anchitherium, 701, 702. 

 Ancyloceras, 434, 435, 436. 

 Ancylotherium, 678. 

 Ancylus, 416. 

 -AridrMis, 517. 

 Androphores, 135. 

 Anelasma, 286. 

 Angelina, 298. 

 Angler, 488. 

 AnguiUula, 247. 

 Anguillulidce, 247. 

 Anguis, 545, 548. 

 Ani, 620. 

 Animals and Plants, differences between, 



13. 



Anisonema, 100. 

 Annelida, 228; characters of, 257; pseu- 



dohsemal system of, 258 ; orders of, 259 ; 



phosphorescence of, 101 ; urticating cells 



of, 108. 



Annulata (see Annelida'). 

 Annuloida, 190, 227. 



Annulosa, characters and divisions of, 227. 

 Anomia, 403. 

 Anomodontia, 530, 563. 

 Anomura, 307, 309. 

 Anoplotheridce, 707, 722. 

 Anoplotherium, 707. 

 Anoplura, 345. 

 Anoura, characters of, 518; development 



of, 520, 521 ; families of, 521, 522. 

 Anser, 606. 

 Anserince, 605, 606. 

 Ant-eaters, 672, 676, 677. 

 Antedon, 213, 215, 216. 

 Antelopes, 718. 

 Antennae, of Lobster, 281, 308 ; ofRhizoce- 



phala, 285, 286 ; of Cirripedes, 287, 289 ; 



of Cladocera, 295 ; of Xiphosura, 300 ; 



of Arachnida, 316 ; of Myriapoda, 329 ; 



of Pauropus, 329, 331 ; of Insecta, 334. 

 Antennularia, 124. 

 Antennules of Lobster, 281, 308. 

 Anthelia, 167. 



Anthropoid Apes, 779. 



A ntkropoides, 610. 



Anthus, 627. 



Antilocapra, 718, 719. 



Antilopidce, 718, 722. 



Antipathes, 158. 



Antipathidce, 157, 158, 180. 



Antlia, 337. 



Ant-lion, 351. 



Antrostomus, 629. 



Ants, 357, 358; communities of, 359; slave- 



making instincts of, 360 ; relations with 



plant-lice, 360. 

 Apateon, 525. 

 Apatornis, 636. 

 Apes, 779. 

 Aphanapteryx, 612. 

 Aphaniptera, 353. 

 Aphides, 348 ; alleged parthenogenesis of, 



39. 



Aphis, 347. 

 Aphis-lion, 351. 

 Aphrocallistes, 90. 

 Aphrodite, 268, 270. 

 .4j?M&E, 358. 

 Apiocrinidce, 212. 

 Apiocrinus, 208, 223. 

 ^>is, 358. 



Aplacental Mammals, 654, 656. 

 Aplysiadce, 412. 

 ^oda (Cirripedia), 283, 292; (Amphi- 



bia'), 513; (Fishes), 485, 486. 

 Apodemata, 279. 

 Aporosa (Corals), 164. 

 Appendicularia, 383, 387. 



Aptenodytes, 602. 



Aptera, 341, 344. 



Apterygidce, 596, 598. 



Apteryx, 590, 595, 596, 597, 598. 



^ws, 41, 296, 297. 



Aquiferous system (see Water - vascular 



system). 



Arachnactis, 155, 156, 180. 

 Arachnida, 274, 275; characters of, 314; 



somite of, 315 ; organs of the mouth of, 



316; respiratory process of, 318 ; distri- 



bution of, in time, 327. 

 Araince, 621. 

 Araneida, characters of, 325; webs of, 



326 ; distribution of, in time, 327. 

 Arcadce, 399, 403. 

 Arcella, 65. 

 Arcellina, 65, 66, 72. 

 Archceocidaris, 200, 224. 

 Archceopteryx, 575, 593, 594, 633, 634. 

 Archegosaurus, 524. 

 Architarbus, 327. 

 Architeuthis, 435. 

 Archiulidce, 332. 

 Archiulus, 332. 

 Arctictis, 746. 

 Arctisca, 320. 

 Arctocebus, 774. 

 Arctoidea, 739. 

 Arctomys, 760. 

 Arctonyx, 742. 

 Arctopitheci, 776. 

 ^irdm, 610. 

 Ardeidce, 610. 

 -drem'coZa, 270. 

 Argonauta, 419, 423 ; shell of, 425, 426 ; 



