INDEX. 



Acalepha, 148, 160, 164. 

 Achromatin, 21. 

 Acorn-shells, 188. 

 Acrania, 240. 

 Acraspeda, 165. 

 Actinozoa, 142. 

 Afferent nerves, 84. 

 Aleyonaria, 155, 157. 

 Alimentary canal, xiii, 36, 46. 

 Allantoidea, 267. 

 Alternation of generations 



(plants), xiii, 151. 

 Alternation of generations 



(animals), xiii, 150. 

 Ambulacral system, 173. 

 Ambulacral tubes, 169. 

 Ammocoetes, 262. 

 Amniota, 267. 

 Amoeba, see index of generic 



names. 

 Amoebiform cells, Xiii, 23, 



145. 

 Amphibia, 39, 73, 74, 239, 247, 



263-265. 

 Amphicoelous, or biconcave 



vertebree, 270. 

 Amphioxus, see index of ge- 

 neric names. 

 Amphioxus, development of, 



241. 

 Amphipoda, 189. 

 Anallantoidea, 267. 

 Analogue, xiii. 

 Anamniota, 267. 

 Anatoiny, xiii. 



Animalculse, xiii. 



Animals, characters which 



distinguish them from 



plants, l'-15. 

 Animal life, chemistry of, 



7-10. 

 " Animal magnetism," 106. 

 Annelida, 178, 182. 

 Anterior, 81. 

 Antherozoids of plants, 6, 12, 



13. 

 Ant-lion, 203. 

 Ants, 208. 

 Ants, vrhite, 203. 

 Anura, 265, 266. 

 Anus, 72, 168, 231, 241i 

 Aphides, 203, 206. 

 Apoda, 265. 

 Appendages, xiii, 83. 

 Aptera, 203. 

 Arachnida, 186, 193. 

 Archaic types, 88. 

 Archenteron, xiv, 40, 70. 

 Aristotle, 293. 

 Arms of Brachiopoda, 232. 

 Arteries, 45. 

 Arthrocostraca, 189. 

 Ai-thropoda,.118, 186. 

 Articulata, 117. 

 Artiodactyla, 283. 

 Artificial selection, 51. 

 Ascidians, 77, 234, 237, 239, 



241. 

 Asexual reproduction, 68, 69> 

 Asiphonia, 212, 217. 



341 



