INDEX 



Abdominal ribs, in Belodonts, 20. 

 Ablepharus, 44. 



— eyelid, 116. 

 Abyssal Ascidians, 481. 



— fishes, 285. 



blindness, 401. 



food, 293. 



luminous organs, 411. 



— region, 269. 

 Acanthodians, 252. 

 Acanthopterygii, evolution, 259. 



— luminous organs, 418. 

 Acanthuridas, habitat, 271. 

 Acipcnser, migrations, 298. 



— huso, habitat, 265. 



— sturio, habitat, 265. 



Acquired characters, in flat-fishes, 367. 

 Acrosaunis, 25. 



Actinopterygians, evolution, 256. 

 Adaptations, evolution in fishes, 439. 

 Aestivation, Amphibia, 182. 



— fishes, 299. 



— reptiles, 43. 

 Aetosaurus, 106. 



— dermal armour, 120. 

 Afferent arteries, dog-fish, 242. 

 Africa, fresh-water fishes, 268. 

 Agamidae, distribution, 41. 

 Aglossa, 166. 



Aglypha, 144. 



Air-bladder, as vocal organ, 407. 



— connection with auditory organ, 393. 



— development, 385. 



— evolution, 260, 381. 



— gases, 389. 



— hydrostatic function, 387. 



— origin, 385. 

 Aistopoda, 174. 

 Albacore, 279, 285. 

 Alburnus lucidus, guanin, 423. 

 Alcock, on blind abyssal fishes, 402. 



— on Minous incrmis, 301. 

 Alepocephalidae, habitat, 286. 



— luminous organs, 416. 

 Alepocephalus affinis, luminosity, 416. 

 Aleposomus socialis, 416. 



Allantoic gills, Amphibia, 227. 

 Allantois, absence in Amphibia, 158. 



— evolution, 227. 



Allantois, reptiles, 13. 

 Alligator, courtship, 66. 



— dermal armour, ii.j, 



— distribution, 39. 



— growth, 55. 



Alternation of generations, in Salps, 



483- 

 Alytes obstetricans, reproduction and 



fig., 192. 

 Amblycephalidaj, distribution, 43. 

 Amblyopsis spelaea, 398. 

 Amblyrhynchus, 36. 



— cristatus, 33. 



— food, 142. 



Ambly stoma altamirani, metamor- 

 phosis, 218. 



— opacum, absence of lungs, 225. 



— tigrinum, relation to axolotl, 213. 

 Amblystomatinas, 163. 



Ameiva, change of colour, 85. 



— colour, 76. 



Amia, air-bladder, 383. 



— blood-vessels of air-bladder, 386. 



— evolution, 258. 



— larva, 342. 



— nest, 321, fig., 322. 



— sexual characters, 309. 

 Amiurus nigrilabris, 401. 

 Ammocoetes, 452. 



— affinities, 454. 



Amnion, absence in Amphibia, 158. 



— evolution, 227. 



— in reptiles, 13. 

 Amphichelyidae, period of, 28. 

 Amphignathodon, reproduction, 196. 

 Amphioxus, 457. 



— affinities, 463. 



— development, 470. 



— locomotion, 460 



— response to stimuli, 466. 



— systematic position, 463. 

 Amphipnous, air-breathing organ, 381. 

 Amphiprion percula, association with 



anemone, 300. 

 Amphisbaenidas, distribution, 41. 



— structure and habits, 114. 

 Amphisile, attitude, 377. 

 Amphiuma, eggs, 203. 



— means, 163. 



495 



