INDEX 
Acipenser sturio (illus.), 162. 
Acorn-barnacle (illus.), 97. 
Air-bladder, 155, 
Albatross, 212. 
Alligator mississippiensis (illus.), 
191. 
Alternation of generations, 35, 
Altricial, 208. 
Ameba (illus.), 12; structure and 
habits, 12. 
Ameba-like protozoa, 12. 
Amphibian, development of, 174; 
distribution, 178; anatomy and 
habits, 179. 
Amphibious (amphi, double; dios, 
life), 176. 
Amphioxus (illus.), 157. 
Amphipod (illus.), 106. 
Anatomy (anatemno, to cut up), 
defined, 1. 
Angler (illus.), 169. 
Angle-worm (illus.), 55. 
Anguillula acett (illus.), 538. 
Animals, characteristics of, 2; sim- 
ple and complex, 18. 
Animals and plants compared, 2. 
Annelids, 55. 
Anosia plexippus (illus.), 125. 
Ant, 128; white (illus.), 120. 
Anteater, 231. 
Antedon (illus.), 148. 
Antelope, 239. 
Ant-lion (illus.), 120. 
Apes, 243, 
Arachnida, characteristics of, 188. 
Archeopteryx, 201, 
Argynnis cybele (illus.), 126. 
Ariolimax columbianus (illus.), 81. 
Armadillo, 231. : 
Arthropods, general features of, 
93. 
Ascidian (illus.), 152. 
Asexual reproduction, 31. 
Astertas ocracea (illus.), 141. 
Astrophyton (illus.), 148. 
Auk, 209. 
Axolotl, 183. 
Back-swimmer, 121. 
Balancers, 122. 
Band-worm (illus.), 70. 
Barnacles (illus.), 96. 
Bascanion constrictor (illus.), 187. 
Basket-star (illus.), 141. 
Bass, 166. 
Bat, brown, 284; red, 234. 
Bear, 239. 
Beaver, 232, 
Bees, 288. 
Beetles, 124. 
Bell animalcule (illus.), 16. 
Bilateral symmetry, 44. 
Biology (bios, life; logos, a dis- 
course) defined, 1. 
251 
