INDEX TO PART I. 



Abalone, 136. 



Abdomen of grasshopper, 2. 



Aboral surface of starfish, 331. 



Acrania, 148, 153. 



Actinozoa, 325. 



Adaptation, 15. 



Adelochorda, 148. 



Air bladder of fish, 155, 163. 



Sacs of grasshopper, 5. 

 Of pigeon, 216. 

 Of snake, 201. 



Tube of grasshopper, 5. 

 Albatross, 226. 

 Albumen, 219. 

 Alligator, 206. 



Gar, 177. 

 Alternation of generations, 322. 



In tunicates, 151. 

 Ambulacral plate, 339. 

 Ammonites, 144. 

 Amoeba, 286. 



Dividing, 289. 



Encysted, 289. 

 Amphibia, 181. 

 Amphioxus, 151. 

 Amphipoda, 84. 

 Ampullae, 333. 

 Angle, facial, 282. 

 Animalcule, bell, 294. 



Slipper, 291. 



Wheel, 352, 353. 

 Annulata, 87. 

 Anolis, 197. 

 Ant, 50, 51. 



Ant-eater, 256, 257, 260. 

 Ant lion, 24. 

 Antelope, 273. 

 Antenna of grasshopper, 4. 

 Anthropoidea, 282. 

 Antidote for snake bites, 204. 

 Antlers, 274. 

 Anura, 195. 



Aortic arches of earthworm, 95. 



Aperture of snail shell, 127. 



Apes, 282. 



Aphids, 23, 50. 



Appendix vermiformis, 283. 



Arachnida, 55. 



Arches, aortic, 95. 



Aristotle's lantern, 340. 



Armadillo, 259, 260. 



Arms, oral, of jellyfish, 323, 324. 



Of squid, 139. 

 Arrowfish, 140. 

 Arteries of crayfish, 68. 

 Arthropoda, i, 54, 77, 86. 

 Artificial selection, 218. 

 Artiodactyls, 267, 269. 

 Ascaris, 351. 

 Ascidians, 148, 149. 

 Assimilation in amoeba, 290. 

 Asteroidea, 331, 347. 

 Auks, 225. 

 Aurelia, 323. 

 Automatic action, 289. 

 Aves, 208. 



Badger, 282. 

 Balancers, 32, 36. 

 Balanoglossus, 148. 

 Baleen plates, 265. 

 Barb of feathers, 208. 

 Barbadoes earth, 299. 

 Barbels of catfish, 173. 

 Barbules of feather, 208. 

 Bark lice, 24. 

 Barnacles, 81, 82. 

 Basket fish, 338. 



Star, 338. 

 Bass, 166. 

 Batrachia, 181. 

 Bats, 264, 265. 

 Beach fleas, 84. 

 Beak of pigeon, 214. 



359 



