822 



INDEX. 



reproductive process of, 427; hectoco- 



tylus of, 424. 

 Argonautidce, 427. 

 Argulus, 284. 

 Aristotle's Lantern, 198. 

 Ark-shells, 403. 

 Armadillos, 672, 675, 676, 680. 

 Arms of Star-fishes, 203 ; of Ophiuroidea, 



206; of Crinoidea, 208; of Comatula, 



214 ; of Cystoidea, 217 ; of Brachiopoda, 



390; of Cuttle-fishes, 419; of Nautilus, 



431, 432. 



Artemia, 41, 297. 

 Arthrogastra, 324. 

 Arthropoda, 228; characters and divisions 



of, 274. 



Articulata, 274. 



Articulata (Brachiopoda), 393, 394. 

 Artiodactyla, 693, 702. 

 Arvicola, 758. 

 Ascaris, 245, 247. 

 Ascidians, solitary, social, and compound, 



386. 



Ascidioida (see Tunicata). 

 Ascoceras, 434. 

 Asellus, 305. 

 JLsmws, 700. 



Asiphonida (Lamellibranchiata), 403. 

 Aspidophora, 378, 379. 

 Aspidorhynchus, 493. 

 Asplanchna, 251. 

 Ass, 701. 



^Istactts, 307, 308. 

 ^stasia, 100, 101. 

 Asteriadce, 205. 

 Asterinidce, 205. 

 Asterocanthiidce, 205. 

 Asteroid Polypes, 165. 

 Asteroidea, 192; general characters of, 



201 ; families of, 205 ; distribution of, 



in space, 222 ; in time, 223. 

 Asthenosoma, 200, 224. 

 Astomata (Protozoa), 58. 

 Astrcea, 163. 

 Astrceidce, 164. 

 Astrogonium, 224. 

 Astropecten, 202, 223. 

 Astropectinidce, 205. 

 Astrophyton, 206. 

 Astrorhiza, 69. 



Athecata, 114. 



Atherura, 755. 



Atlantidce, 414. 



Atolls, 181, 182. 



Atrial system (Brachiopoda), 391. 



Atrium (Tunicata), 382. 



J.a, 360. 



Auchenia, 712. 



Auk, 602, 603. 



Aulopora, 165. 



.Awrefta, 139, 144. 



Aurelia, 342. 



Auricularia, 219. 



J.wricuZid<#, 415. 



Aurochs, 720. 



Autolytus, 269. 



Autophagi, 589. 



Aves, 458 ; general characters of, 571-592 ; 

 feathers of, 572-574 ; vertebral column 

 of, 574 ; beak of, 576 ; pectoral arch and 

 fore-limb of, 578 e seg. ; hind-limb of, 



581 et seq. ; foot of, 583 ; digestive sys- 

 tem of, 583-586 ; respiratory system of, 

 586 ; circulatory system of, 586, 588 ; 

 nervous system and organs of sense of, 

 589, 590; reproductive system of, 588; 

 migrations of, 591 ; divisions of, 594- 

 595 ; orders of, 595-636 ; distribution of, 

 in time, 592; literature, 636. 



Avicularia, 374, 375, 377. 



Aviculidce, 403. 



Avocet, 608. 



Axinella, 84. 



Axolotl, 515, 516, 517. 



Aye-aye, 773. 



Azorica, 90. 



Baboon, 778, 779. 



Babyroussa, 706. 



Bacteria, 10, 44, 45, 47. 



Bactrites, 436. 



Baculites, 434, 436, 437. 



Badger, 742. 



Balcena, 685, 686, 687. 



Balcenidce, 685, 686, 692. 



Balcenoptera, 688. 



Balancers, 335, 354. 



Balanidce, 288, 289, 290, 291 ; distribution 

 of, in time, 313. 



Balanoglossus, 241. 



Balanus, 287, 290, 291. 



Balatro, 249. 



Balearica, 610. 



Baleen, 685, 686, 687. 



Balistidce, 488. 



Banded Ant-eater, 667, 668. 



Bandicoot, 665, 666. 



Banxring, 770. 



Barbadoes Earth, 80. 



Barbel, 485. 



Barbets, 620, 622. 



Barnacles, 287, 288, 290. 



Barrier-reefs, 181, 182. 



Bascanion, 543. 



Basiliscus, 550. 



Bassaris, 741. 



Bathybius, 62. 



Bathycrinus, 213, 222. 



Bathyergus, 757. 



Batides, 598, 599. 



Batrachia, 518. 



Bats, 761 et seq. 



Beaked Rays, 500. 



Bear, 739, 740, 751. 



Bear-animalcules, 320. 



Bearded Vulture, 632. 



Beaver, 756. 



Bed-bug, 349. 



Bee-eaters, 628, 629. 



Bees, parthenogenesis of, 40 ; communi- 

 ties of, 33. 



Belemnites, structure of, 492, 430. 



Belemnitidce, 429, 437. 



Belinurus, 314. 



Bellerophina, 416. 



Bellerophon, 416. 



Belodon, 558. 



Beluga, 493. 



Benturong, 746. 



Berardius, 691. 



Beroe, 179, 180. 



Beroidce, 179, 180. 



Bighorn Sheep, 720. 



