496 REPTILES, AMPHIBIANS AND FISHES 



Amphiumida;, 163. 



Anabantidae, 299. 



Anabas scandens, aerial respiration, 379. 



Anableps, eyes, 397. 



— gestation, 335. 

 Anacanthini, evolution, 258. 

 Anadromous fishes, 297. 

 Anarrhichas lupus, size of eggs, 345. 

 Anchovy, eggs, 343. 



— migrations, 295. 



Ancistrodon contort us, colour of young, 



82. 

 Andrias scheuchzeri, 173. 

 Anelytropidae, absence of limbs, 115. 

 Angler, larva, 345. 



— figs, of larvae, 344. 



— spawn, 343. 

 Anglers, fins, 377. 

 Anguidae, dermal bones, 118. 



— form of body, 113. 



— reproduction, 69. 



— distribution, 41. 



Anguis fragilis, breaking of tail, 151. 



— structure and habits, 113. 

 Aniellidae absence of limbs, 116. 

 Anolis, change of colour, 84. 



— hind feet, 95. 



— carolinensis, fighting of males, 66. 



— sexual characters, 63. 

 Anomalops graeffii, luminous organs, 



420. 

 Anomodonts, horns, 127. 



— origin, 16. 



— temporal arch, 10. 

 Antarctic fishes, 274. 

 Anura, 160, 165. 



— fossil forms, 173. 



— metamorphosis, 211. 

 — ■ neoteny, 217. 



— number of species, 176. 



— recrescence, 229. 

 Aortic arches in reptiles, 13. 

 Aphyonus, blindness, 401. 



— habitat, 290. 

 Apoda, 160, 167. 



— number of species, 176. 



— reproduction, 205. 

 Apodes, abyssal forms, 287. 

 Appendicularians, 479. 



— house, 480. 

 Aquatic reptiles, 34. 

 Arapaima, habitat, 267. 

 Arboreal reptiles, 34. 



— form of body, 92. 

 Archegosaurus, 172. 

 Archiascidia, 480. 

 Arcifera, 166. 

 Arctic fishes, 273. 

 Arctogaea, Amphibia of, 179. 

 Argentina, habitat, 287. 



— use for artificial pearls, 423. 



Argyropelecus, luminous organs, 413. 



— in British area, 414. 

 Arius, mouth gestation, 329. 



— australis, 329. 



Armour dermal, in reptiles, 117. 

 Ascidia mentula, 481. 

 Ascidiacea, 480. 

 Ascidiae Luciae, 482. 

 Ascidians, compound, 481. 



— development and evolution, 487. 



— general characters, 473. 



— food, 475. 



— heart, 477. 



— nervous system, 474, 476 

 — ■ reproductive organs, 477. 



— respiration, 475. 



— Simple, 480. 

 Aspredo, reproduction, 331. 

 Associations of fishes, 300. 



— of reptiles, 61. 

 Astronesthes, habitat, 287. 



— luminous organs, 415, 426. 

 Asymmetron, 463. 

 Atractaspis, oviparity, 68. 

 Atrial cavity, of Ascidians, 475. 



of Lancelets, 460. 



Auditory organ, evolution, 396. 



— fishes, 243. 

 Australasia, reptiles, 41. 

 Australia, amphibia, 178. 



— fishes, 282. 



Australian region, fresh-water fishes, 



269. 

 Autodax lugubris, allantoic gills, 226. 



care of eggs, 201. 



respiration, 226. 



Axolotl, courtship, 198. 



— history, 212, 213, 214. 



— systematic position, 163. 



Bairdiella, voice, 406. 

 Balanoglossus, 489. 

 Batistes, habitat, 272. 



— sound production, 409. 

 Bascanium constrictor, colour at differ- 

 ent ages, 82. 



Basiliscus americanus, sexual charac- 

 ters, 62. 

 Basilisk, crest, 109. 



— terrifying attitude, 150. 

 Batagurs, food, 48. 



Bates, H. W., on caimans, 45. 

 Bateson, on hearing in fishes, 390. 

 Bathylagus, habitat, 287. 

 Bathypterois, 288, 412. 

 Bathysaurus, 288. 

 Batoidei, in fresh water, 263. 

 Batrachia salientia, 165. 

 Bdellostoma, gill-sacs, 442. 



— variation in gills, 446. 

 Beak, horny in reptiles, 136. 



