940 



INDEX 



Ascidiacea, 513. 

 Ascidian, 7. 



— embryo of, 506, 507. 



Ascon type (of sponge), 156. 

 Asellus, 243, 331. 

 Asexual reproduction, 61, 62. 

 Aspidochirotae, 310. 

 Aspidocotylea, 223. 

 Aspidogaster, 223. 

 Aspredo, 628. 

 Astacus, 9, 320, 353. 



— development of, 334, 335. 

 Asteracanthion, 292. 

 Asterias, 292, 294, 295, 297. 

 Asterina, 297, 298. 

 Asteroidea, 292, 315. 

 Asthenosoma, 305. 

 Astraea, 197, 205. 

 Astroides, 196. 

 Astronyx, 300. 

 Astropecten, 298. 

 Astrophyton, 300. 

 Astrorhizidre, 144. 

 Astylostemus, 681. 

 Asymmetron, 528. 

 Atavisms or reversions, 107. 

 Atax, 423, 453- 



Ateles, 885. 



Athecae, 689. 



Atlanta, 474. 



Atlantosaurus, 720. 



Atlas vertebra, 786, 787, 787. 



Atrial chamber, 521. 



Atriopore of Amphioxus, 516. 



Attidae 422. 



Attus, 422. 



Atypus, 422. 



Auchenia, 850. 



Auditory capsules of skull, 533. 



— hairs of crayfish, 327. 



— nerve, 545. 



— organs of Insects, 389. 



— ossicles, 550. 



— pit, 548. 



— vesicle, 548. 

 Auerbach's plexus, 174. 

 Aulostoma, 279. 



Aurelia, 171, 184, 185, 186, 205. 



— life-history of, 187, 188. 



— relatives of, 190. 



Auricularia (of Holothuria), 310, 317. 



Australian region, 905. 



Autogamy, 64. 



Autostylic, 635. 



Autotomy in Echinoderms, 290. 



Autozooid, 200. 



Aves (see Birds), 725. 



Axial gradient, 41. 



— skeleton (see Backbone), 532. 



— structures, development of, 84. 

 Axifera, 201. 



Axis-cylinder of nerves, 50. 

 Axis vertebra, 788, 788. 

 Axolotl, 678, 678, 681 ' 

 Aye- Aye, 881. 

 Azygobraachs, 474. 



I Babirusa, 849. 

 Baboons, 885. 

 Backbone, 536. 

 Bacterial symbionts, 391, 461. 

 Bactrites, 485. 

 Baculites, 485, 

 Badger, 873. 

 Balaena, 864. 



— pelvis and hind-limb of, 863. 

 Balaenoidea, 864. 

 Balaenoptera, 864. 



— fore-limb of, 861. 



— vertebra, rib, and sternum of, 865. 

 Balanoglossus, 6, 7, 3i7, 489, 49°, 491, 



492, 573- 



— affinities of, with Annelids, 497. 



— Vertebrate characters of, 7, 496. 

 Balanus, 346, 346. 

 Baleen, 862, 865. 

 Bandicoot, 840. 

 Barbary ape, 885. 

 Barbule, 616. 

 Barnacle, 344, 345- 

 Basal plate of coral, 197. 

 Basitemporal, 726. 

 Bat, skeleton of, 878. 

 Batoidei, 609, 634. 

 Bats, 876. 

 Bat's wing, 877. 

 Bdella, 423. 



Bdellostoma, 565, 577, 579. 579 

 Bears, 873. 

 Beaver, 867. 

 Bee 377. 



— habits of, 377, 382. 



— head and mouth parts of, 378. 



— parasites, 387, 395, 406. 

 Beetles, 384, 406. 

 Belemnites, 485, 488. 

 Belinurus, 429. 

 Belodon, 717. 

 Beroe, 206. 



Bilateral symmetry, 41. 

 Bile, 31. 

 Bilharzia, 223. 



— male and female, 222. 

 Bionomics. See Ecology. 



— Crustacea, 359. 



— Fishes, 630. 



— Insects, 402. 



— MoUusca, 477. 



— Protozoa, 143. 



— Sponges, 164. 

 Bipsdium, 214. 

 Bipinnaria, 317. 

 Bird lice, 384, 407. 

 Birds, 3, 725. 



— and Reptiles, 4, 683, 724. 



— classification of, 3, 768. 



— cloaca of, 748. 



— courtship of, 759. 



— diagrammatic section of embryo within 

 egg, 768. 



of young, 730. 



— diet of, 762. 



— eggs of, 760. 



