INDEX. 



Abilormal articulations, 275. 

 Abortion of phalanges in ungulates, 



353. 

 Acanthodeans, 92. 

 Acanthopterygia, 102, 103, 104, 105, 



loS, 

 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. 

 ySlurodon seevus Leidy, 342. 

 ^thalium, 503. 

 jEtheria, 267. 

 Affections, 517. 



Africa, 73, 88, 115, 163, z68, 462. 

 Agamidae,73. 

 Agassiz, A., 172, 175. 

 AgeltEUs pkaniceus, 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. 14I1 i43j 144i 



297. 341. 354. 520. 

 Amblyrhiza, 352. 

 Amblystoma ti^inum, 58, 59, 200. 

 Amblystomidae, 58, 199. 

 Ameghino, 154, 157. 357. 365. 

 America, 42G. 



Ametabola, 203. 

 Ammocoetes, 204. 

 Ammonitinae, 187, 188, 189, 190 

 Ammonoids, 187, 188, 422. 

 Ammonoidea, 421. 

 Amoeba, 76, 249. 

 Amoebodect mastication, 318. 

 Amphignathodontidae, 71. 

 Amphimixis, 459. 

 Amphioxus, 86, 457. 

 Amphisilidae, 104. 

 Amphiuma, 113, 218. 

 Anabolism, 481. 

 Anacanthini, 105, 106. 

 Anagenesis, S02, 475, 479, 516. 

 Anaplasis, 201. 

 Anaptomorphus, 155. 

 Anaptomorphidae, 154. 

 Anarcestes, 187. 

 Anchitherium, 148, 320, 359. 

 Ancistrodon contortrzx, 22. 

 Ancyloceras, 189. 

 Ancylopoda, 128, 140, 143. 

 Anelytropidae, 123. 

 Anguidae, 123. 

 Annelides, 269. 

 Anniellidae, 123. 

 Anodonta, 261. 

 Anomia, 170, 177. 

 Anotnza glahra.y 265. 

 Anomodontia, 115. 

 Anthropomorpha, 132, 133, 143, I54t 



157, 158, 159, 305. 

 Antichemism, 484. 

 Antiloca^ra americana^ 55. 

 Ants, 462, 500. 

 Anura, 107, no, in, 113. 

 Aphrododiridae, 104. 



