INDEX 



705 



Appendicular skeleton, 495. 



Appendicularia, 393, 



Appendix, vermiform, 638. 



Apseudes, 296, 297. 



Aptera, 337-338- 



Apteria, 578. 



Apterygiformes, 589, 598; Apteryx, 589, 

 598. 



Arachnida, 275, 276, 371-385. 



Araneida, 371-377. 



Arbacia, 190. 



Area, 262. 



Arcella, 39. 



Arch, gill, 437 ; hyoid, 437; visceral, 437. 



Archaean era, 697. 



Archaoptcryx, 592, 593, 617, 694, 695. 



Archaornithes, 575, 588, 593. 



Archenteron, 88, 89. 



Archiannelida, 215, 232-233. 



Archigetes, 165, 166. 



Archipterygium, 446. 



Arctiida, 353. 



^Ittfca, 602 ; Ardeida, 590, 602. 



Argonauta, 268, 269. 



Argulus, 294. 



Aristotle's lantern, 203, 204. 



Armadillium, 297, 301. 



Armadillo, 643, 660, 661. 



Aromochelys, 535, 541. 



Artemia, 292, 293, 300. 



Arteries, 485, 486 (see circulatory system). 



Arthrobranchiae, 284. 



Arthropoda, 3, 24, 274-385; classifica- 

 tion, 275. 



Artiodactyla, 644, 667-671. 



Ascaridtz, 173; Ascaris, 169, 170-173. 



Ascidiacea, 390, 39!-393- 



Ascon, 99, 100. 



Asettus, 296, 297. 



Aspidiotus, 346, 347. 



Aspidobranchia, 258. 



Ass, 644, 671, 684, 701. 



Assimilation, 31. 



Astacus, 276, 284. 



Asterias, 189, 190 (see starfish). 



Asteroidea, 189, 198, 213. 



Astragalus, 497. 



Astrangia, 137. 



Astropecten, 189. 



Astrophyton, 189, 201. 



^star, 606. 



Asymmetry, 252. 



, 644, 664. 

 Atheca, 535. 

 Atoll, 138, 139. 

 Atractaspis, 539. 

 Atriopore, of ^4 mphioxus, 394, 395 ; 



Tunicata, 391. 

 Atrium, 391, 397. 



4/to, 369; 4K/#, 377; .4tfMs, 376. 

 Attraction-sphere, 12, 13. 

 Auditory capsule, 416, 419; ossicle, 635, 



640. 



Auk, 590, 607, 609. 

 Aurelia, 129, 130. 



Auricle, 406 (see circulatory system). 

 Auricularia, 211. 

 Aurochs, 684. 

 Aurophore, 126. 

 Autodax, 517. 

 Autolytus, 235, 236. 

 Autotomy, 198, 201, 290. 

 Aves, 401, 575-631, 694 (see bird). 

 Avicularia, 184. 

 Avocet, 607. 

 Axolotl, 516, 523. 

 Aye- Ayes, 662. 



Baboon, 644. 



Badger, 655. 



Balcenida, 675. 



Balanoglossida, 386, 387; Balanoglossus, 



214, 399, 693. 

 Balantidium, 71. 

 Balanns, 294, 295, 300. 

 Balcena, 645, 675, 676 ; Balcenoptera, 645, 



675, 676. 



Bandicoot, 642, 649. 

 Barnacle, 300. 

 Basal disk, 109, no, 134. 

 Basepterygium, 436, 437. 

 Basilarchia, 352. 

 Basilingual plate, 494. 

 Basipodite, 280. 



Bass, 444, 465, 466, 467, 475, 476. 

 Bats, 642, 643, 650, 651. 

 Bdellostoma, 414, 420. 

 Bdelloura, 156. 



Beak, of pigeon, 576; of turtle, 529, 530. 

 Bears, 652, 654-655. 

 Beaver, 643, 658, 659. 

 Bees, 364, 366, 367. 

 Beetles, 337, 347, 360-364. 

 Behavior, of Ameba, 33; crayfish, 290; 



2 z 



