INDEX 



Acipenser sturio (illus.), 162. 



Acorn-barnacle (illus.), 97. 



Air-bladder, 155. 



Albatross, 212. 



Alligator mississippiensis (illus.), 



191. 



Alternation of generations, 35. 

 Altricial, 208. 

 Amoeba (illus.), 12; structure and 



habits, 12. 



Amoeba-like protozoa, 12. 

 Amphibian, development of, 174 ; 



distribution, 178 ; anatomy and 



habits, 179. 

 Amphibious (amphi, double; bios, 



life), 176. 



Amphioxus (illus.), 157. 

 Amphipod (illus.), 106. 

 Anatomy (anatemno, to cut up), 



defined, 1. 

 Angler (illus.), 169. 

 Angle-worm (illus.), 55. 

 Anguillula aceti (illus.), 53. 

 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, 133. 



Arcliceopteryx, 201. 



Argynnis cybele (illus.), 126. 



Ariolimax columbianus (illus.), 81. 



Armadillo, 231. 



Arthropods, general features of, 



93. 



Ascidian (illus.), 152. 

 Asexual reproduction, 31. 

 Aste'rias ocracea (illus.), 141. 

 Astrophyton (illus.), 143. 

 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, 234; red, 234. 

 Bear, 239. 

 Beaver, 232. 

 Bees, 238. 

 Beetles, 124. 



Bell animalcule (illus.), 16. 

 Bilateral symmetry, 44. 

 Biology (bios, life ; logos, a dis- 

 course) defined, 1. 



251 



