INDEX. 



AcantJiccephala, 114 ; general cliarac- 



tersof, 121. 

 Acanthometra, 34. 

 Acanthophis, 2*^8. 

 Acanihiipteri, 243. 

 Acarina, 153. 

 Acarus. 153. 



.^cc^/m^a (Mollusca), 200. 

 Achetidie, 171. 

 Acipmiscr, 244. 

 j4c)j3e7is^r/dce, 245. 

 Acorn-shells, 14S, 149. 

 Acridiidm, 171. 

 Actinia, 84, 85. 

 Actiniidm, 85. 

 .^ ctinaphrys, 36. 

 Actinozoa. 5^^; general characters of, S3; 



orders of, 85. 

 A'ljutant, 296. 

 yl':<rnii(la\ 60. 

 yElnrus, 347. 

 yE'iiifreri, 71. 

 Agouti, 350. 



Air-receptacles of Birds, 286. 

 Alces. 338. 

 ^^cidte, 295. 

 Alcyonaria, 85; geneial characters of, 



90, et seq. 

 Alcyoniuin, 91. 

 Alligator, 272,273. 

 Allopora, 82. 

 Alpaca, 337. 

 Ambhj stoma, 251, 252. 

 Ainbulacral system oi Echinia, 101. 

 j4?/i€iya, 271. 



Anietabniic Insects, 165, 168. 

 Ammo7iile8, 216. 

 Anweha, 2<\ 25, 28. 

 AhKrhra, 25, 28. 

 Amphibia, 227 ; general characters of, 



249, et seq. 

 AmphidisL'S, 48. 

 AmphivxKs, 237, 238. 

 Amphipoda, 143. 

 Anacanthini, 243. 

 Anaconda, 269. 

 Analogy, 9, 10. 

 Anarthropoda, 112. 

 ylna(//ice, 295. 

 A ncintrodon, 267. 

 AnguiUula, 123. 

 Anguis, 270. 



Animals and Plants, differences between, 



2, ff seq-. 

 Annelida^ 112 ; general characters of, 



128 : typical segiiieiit of, i6. ; divisions 



of, 13 It. 

 Annulosa, 112 ; general characters of, i&. 

 An'jinodontia, 277. 

 A noitiura, 141. 

 Annplurn, IGS. 

 --4?ioitr«, 253. 

 -In-^ertftCEj 295. 

 Ant-eaters, 324, 326, S27. 

 A7itcd-»i, 106, 107. 

 Antelopes, 339. 

 Antennre, 140, 160. 

 Anthropoid Ajies, 353. 

 Antilocapra, 339. 

 Ant-lion, 173. 

 Ants, 179. 

 Apes. 355, 358. 

 Aphanipiera, 174. 

 Aphides, 170. 

 Aphis-lion, 173. 

 Aphrodite, 135. 

 Apidce, 179. 



Aplacental Mammals, 317. 

 Aptera, 168. 

 Apteryx, 283, 291. 292. 

 Aquiferous System (Sponges), 45. 

 Arachnactis, 86. 

 Arachnida, 113 ; general characters, 151 ; 



orders' of, 153. 

 Araneiila, 155. 

 Arclufoptrrtjx, 306. 

 Ardeii, 297. 

 ^7-rfetdce, 296. 

 Arenicola, 134. 

 Argonauta, 211, 212, 213. 

 Armadillos, 325, 326, 327. 

 Arms of Brachiopoda, 194 ; of Cephalo- 

 poda, 209, 211, 212, 214. 

 Artrmia, 147. 

 Arthropoda, 113; general characters of, 



136. 

 Arfii'itlafa, 186. 

 Artio.laclyla, 331, 333. 

 jArfir/s, 123. 

 Aseidinn Mollnscs, IPl ; solitary, social, 



and compound, 193. 

 As-cHiij^, 143. 

 AsinuK, 333. 

 Ass, 333. 



