INDEX. 
Abranchiata, 181. 
Acanthocephala, 19, 117 ; general charac- 
ters of, 1238. 
Acanthometra, 41, 58, 
Acanthophis, 268, 
Acanthoptert, 242, 
Acarina, 151. 
Acarus, 20, 152. 
Acephala (Mollusca), 197. 
Achetina, 21, 167. 
Acineta, 53. 
Acorn-Shells, 20, 147. 
Acrydium, 168. 
Actinia, 55, 92. 
Actinide, 18, 19. 
Actinozoa, 18,57; general characters of 
90 ; orders of, 92. ? 
Adelarthrosomata, 20. 
Adjutant, 294. 
Agapornis, 299. 
Agontt, 337. 
Atlurus, 834, 
Air-receptacles of Birds, 285, 
Alcedinide, 24. 
Alces, 327. 
Alcide, 21. 
Alcyonaria, 18, ¢2; general characters 
of, 97. 
Alcyonium, 18, 97. 
Alge, 4. 
Alligator, 23, 271, 272. 
Alpaca, 327. 
Amblystoma, 250, 
Ambulacral system of Zchinus, 107. 
Ameiva, 270, 
Ametabolic Insects, 162, 165. 
Ammonites, 213. 
Ameba, 17, 31, 52; vacuoles of, 32; 
nucleus of, 83; reproduction of, 70. 
Amebea, 30, 32. 
Amphibia, 23, 215, 225 ; general charac- 
ters of, 217, eb seq. 
Amphidises, 45. 
Amphioxus, 22, 236, 237. 
Amphipoda, 20, 148. 
Ampullaria, 198, 
Anacanthini, 241. 
Anaconda, 267. 
Analogy, 14. 
Anarthropoda, 19, 128, 129. ° 
Anatine, 23, 291. 
Angelina, 145. 
Anguillula, 19, 124, 125. 
Anguis, 269. . 
Animals and Plants, differences between, 
3, eb Seq. 
. 
Annelida, 19, 129; general characters 
of, 130; typical segment of, 76 ; divi- 
sions of, 131. 
Annuloida, 15, 18; characters and 
divisions of, 163; tabular view of, 
177. 
Annulosa, 15,19 ; general characters of, 
128 ; tabular view of, 177. 
Anomodontia, 28, 260. 
Anomura, 141, 
Anoplura, 20, 165. 
Anoura, 23, 248, 252, et seq. 
Anserine, 23, 291. 
Ant-eaters, 24, 812, 317, 319. 
Antelopes, 25, 323, 328, 329. 
Antenze, 139, 161. 
Anthropoid, Apes, 344, 
Antilope, 329. 
Antipathes, 102, 
Ant-lion, 163. 
Ants, 21, 173. 
Apes, 342, 
Aphaniptera, 21, 170. 
Aphides, 21, 166. 
Aphis-lion, 167. 
Aphrodite, 10, 1385. 
Apide, 21, 175. 
Aplacental Mammals, 318. 
Aptera, 162. 
Apteryx, 24, 288, 294, 295, 296. 
Apus, 148. 
Aquiferous System (Sponges), 44. 
Aquilina, 34. 
Arachnactis, 92, 93. 
Arachnida, 20, 157 ; general characters, 
149 ; orders of, 151. ~ 
Araneida, 20, 183. 
Archcopteryx, 24, 290, 304. 
Archomys, 338, 
Ardea, 298. 
Ardeide, <3, 294. 
Arenicola, 19, 135.4 
Argonauta, 22, 205, 209, 210. 
Armadillos, 24, 312, 817, 318. 
Arms of Brachiopods, 191; of Cepha- 
lopoda, 206, 208, 2u9, 210, ¥11. 
Arrow-worm, 19. 
Artemia, 20. 
Arthropoda, 19, 129 ; general characters 
of, 136. 
Articulata, 136. 
Artiod ctyla, 323, 824. 
Ascaris, 19, 124. 
Ascidian Molluscs, 21, 188; solitary, 
social, and compound, 189. 19. 
Ascidiotda, 188. 
