INDEX. 



Absence of certain animals in fossilifer- 

 ous deposits, liow accounted for, i. 56. 



Acanthocladia, i. 422. 



Acanthodes, ii. 146. 



Acanthodidce, ii. 134, 145. 



Acanthomeira, i. 130. 



Acantliopholis, ii. 231. 



Acanthopteri, ii. 127. 



Acanthotelson, i. 389. 



Acanthoteuthis, ii. 90, 95. 



Acarida, i. 399. 



Acasta, i. 337. 



Acaste, i. 369. 



Acer, ii. 473. 



Acerotherium, ii. 324, 325, 327. 



Acervidaria, i. 214, 215. 



Achatina, ii. 43. 



Acicula, ii. 46. 



Aciculidce, ii. 6, 46. 



Acidaspidce, i. 372. 



Acidaspis, i. 355, 371, 372. 



Acijjenser, ii. 132, 133, 151. 



^cmcca, ii. 34. 



Acorn-.shells, i. 335, 



Acrocidaris, i. 231. 



Acroeulia, ii. 33. 



Acrodont Lizards, ii. 201. 



Acrodus, ii. 157, 160, 161. 



Acrogens, ii. 439. 



Acrosalenia, i. 233. 



Acrostichites, ii. 466. 



Acrotreta, i. 460. 



Acroura, i. 258, 259. 



Acteonella, ii. 36. 



^c^eowiwa, ii. 36. 



Actinacis, i. 197. 



Actinia, i. 177. 



Actinocrinidie, i. 277. 



Actinocrinus, i. 264, 277, 278. 



Actinodonta, i. 487. 



Actinometra, i. 265. 



Actino7nma, i. 130, 131. 



Actinostoma, i. 421. 



.4c<M^o^oa, i. 152 ; characters, i. 153 ; 

 distribution in time, i. 176. 



Adacna, i. 497. 



Adapis, ii. 417. 



jEchmina, i. 346. 



jEchmodus, ii. 136, 137. 



JSglijia, i. 353, 356, 376. 



^glinidce, i. 376. 



jEgoceras, ii. 82. 



jEpiornis, ii. 258. 



^quoridce, i. 154. 



Aganides, ii. 76. 



Agaricocrinus, i. 278. 



Agassizocrinus, i. 284. 



Agathaumas, ii. 2.38. 



Agelacrinidoe, i. 252. 



Agelacrinus, i. 252, 253, 254. 



Agnopterus, ii. 260. 



Agnostidce, i, 363, 379. 



Agnostus, i. 354, 355, 360, 365, 379, 380. 



Agriochcerus, ii. 353. 



^Zces, ii. 361. 



AUyonaria, i. 153 ; characters of, i. 218 ; 



distribution of, in time, i. 219. 

 Alcyonidce, i. 219. 

 Alcyonium, i. 219. 

 ^^erfo, i. 426, 431. 

 Alethopteris, ii. 446, 452, 453, 463. 

 Aletornis, ii. 262. 

 ^^^rcB, ii. 430, 431, 440, 443. 

 Alligator, ii. 209, 210. 

 Allomys, ii. 411. 

 Allopora, i. 173. 

 AUorisma, i. 508, 509. 

 Alnus, ii. 469. 

 Alveolar ia, i. 434. 

 Alveolina, i. 110. 

 Alveolites, i. 200, 201. 

 ^Zi;eo;;ora, i. 197, 198, 199. 

 AjiiaWieus, ii. 82. 

 .4»ftaMra, ii. 15. 

 Amber, ii. 434. 

 Aiiih]iij)lcni,s, ii. 135. 



yl /;//,///,■///;.(», ii. 408. 



Aiiiblijrliyiichus, ii. 208. 



Ambonychia, i. 478. 



Amia, ii. 135. 



Amiadce, ii. 134, 142. 



Ammonites, ii. 59, 75, 77-83; sections 

 of, ii. 79, 82. 



Ammo7iitidce, ii. 58, 59 ; characters of, 

 ii. 73; shell of, ii. 62, 74; develop- 

 ment of, ii. 65. 



Amosbea, i. 98. 



Amphechinus, ii. 415. 



Amphibia, characters of, ii. 173 ; orders 



. of, ii. 174-185. 



