INDEX. 



Abnormal articulations, 275. 

 Abortion of phalanges in ungulates, 



353. 

 ^canthodeans, 92. 

 Acanthopterygia, 102, X03, 104, 105, 



108, 

 Acceleration, 9, 201. 

 Acquired characters, 10, 399, 401, 402, 



458. 

 Acrania, 87, 94, 95, 193. 

 Acris, 71. 



Actinopterygia, 100, 172. 

 Actinozoa, 82, 83. 

 Adapidae, 155. 

 Adirondacks, 50. 

 ^hirodon stevus Leidy, 342. 

 yEthalium, 503. 

 iEtheria, 267. 

 Affections, 517. 



Africa, 73, 88, 115, 163, 168, 462. 

 Agamidae, 73. 

 Agassiz, A., 172, 175. 

 Agclc€i<s phceniceus, 52, 

 Ageniosus, 103. 

 Aglossa, 63. 

 Agnatha, 99, 195. 

 Alaska, 49, 50. 

 Algae, 75.77- 



Allen, H. Dr., 47, 302, 334, 357. 

 Allen, J. A., 45. 

 Altruism, 517. 

 Amblypoda, 128, 132, 133, 141, 143, 144, 



297. 34i> 354. 520- 

 Amblyrhiza, 352. 



AmUystoiiia ti^rinuin, 58, 59, 200. 

 Amblystomidae, 58, 199. 

 Ameghino, 154, 157, 357, 365. 

 America, 426. 



Ametabola, 203. 

 Ammocoetes, 204. 

 Amnionitinae, 187, 188, 189, iqo 

 Ammonoids, 187, 188, 422. 

 Ammonoidea, 421. 

 Amoeba, 76, 249. 

 Amcebodect mastication, 318. 

 Amphignathodontidae, 71. 

 Amphimixis, 459. 

 Amphioxus, 86, 457. 

 Amphisilidae, 104. 

 Amphiuma, 113, 218. 

 Anabolism, 481. 

 Anacanthini, 105, 106. 

 Anagenesis, 502, 475, 479, 516. 

 Anaplasis, 201. 

 Anaptomorphus, 155. 

 Anaptomorphidae, 154. 

 Anarcestes, 187. 

 Anchitherium, 148, 320, 359. 

 Ancistrodon contortrix, 22. 

 Ancyloceras, 189. 

 Ancylopoda, 128, 140, 143. 

 Anelytropidae, 123. 

 Anguidae, 123. 

 Annelides, 269. 

 Anniellidae, 123. 

 Anodonta, 261. 

 Anomia, 170, 177. 

 Anojiiia glabra, 265. 

 Anomodontia, 115. 

 Anthropomorpha, 132, 133, 143, 154, 



157. 158, 159. 305. 

 Antichemism, 484. 

 Antilocapra americana, 55. 

 Ants, 462, 500. 

 Anura, 107, no, iii, 113. 

 Aphrododiridae, 104. 



