INDEX. 



Absence of certain animals in fossiliferous 



deposits, how accounted for, 27-39. 

 Aeanthocladia, 196, 529. 

 Acanthodes, 830. 

 Acanthodidce, 322-330. 

 Aeanthopteri, 318. 

 Acanthotrpongia, 68. 

 Acanthotehon, 177. 

 Acanthoteuthis, 295. 

 Acarida, 182. 

 Acasta, 152. 

 Acaste, 170. 

 Acer, 502. 



Acerotherium, 425, 426. 

 ^IcAatina, 266. 

 ^cicuto, 268. 

 Aciculidce, 268. 

 Acidaspidas, 171. 

 ^cidapis, 171. 

 Acipenser, 322, 333. 

 Acmata, 259. 

 Acorn-shells, 150. 

 Acrodont Lizards, 362. 

 Acrodus, 335, 337, 339, 340, 410. 

 Acrogens, 473 ; age of, 476. 

 Aerotepis, 530. 

 Acrosalenia, 110. 

 Acrostiehites, 497, 533. 

 ylcroura, 117. 

 Acteonella, 261. 



6, 87. 



Actinocrinus, 121, 126. 

 Actinogpongia, 637. 

 ^ictinozoa, 73; characters, 85; distribu- 



tion in time, 86. 

 Adductor muscles of Lamellibranchiata, 



218. 



jEchmodvs, 324. 

 J'Mina, 169. 

 Jfpiorni*, 390, 394. 

 , T4. 



Age of Acrogens, 476; of Oymnosperms, 

 476; of Angiosperms, 476. 



tM, 162, 163, 167, 168. 

 Alceg, 435. 



Alcyonaria, 73; characters of, 101; dis- 

 tribution of, in time, 101. 

 Alcyonium, 101. 

 Alethopteris. 482, 486, 494. 

 Alqas, 473, 477. 

 Alligator, 366, 36T. 



Alnus, 500. 



Alum-schists, of Sweden, 510. 



Amber, insects preserved in, 186. 



Amblypterus, 323, 534. 



Amblyrhynchug, 365. 



Ambonychia, 223, 224. 



Ambulacral ossiclesof Star-nshes, 112, 113. 



Amia, 323. 



Amiadas, 322, 323, 327. 



Ammonites, 289; sections of, 290. 



Ammonitidce, 279, 280, 281; characters 



of, 286; shell of, 279, 286. 

 Amcebea, 59. 

 Amphibia, 305; characters of, 346 ; orders 



of, 347 ; distribution of, iu time, 347. 

 Arnphitcelia (Crocodilia), 366,367. 

 Amphicyon, 450. 

 Amphidetus, 109. 

 Amphihelia, 96. 

 Amphileites, 405, 410. 

 Amphion, 170. 

 Amphipoda. 176. 

 Amphusbcena, 361. 

 Amphigponqia, 69. 

 Amphistegtna, 63. 

 ^mp/uUeriww, 405, 410, 411. 

 Ainphitrag-ulus, 434. 



, 526. 



Ampullaria, 245, 255. 

 , 167, 169. 

 . 537. 



Ananchytes, 109. 

 Ananchytidce, 109. 

 ^TiartAropodo, 136. 

 -dnattfa, 153, 155. 

 ^Tiatma, 888,98ft. 

 ^?iatinuto, 218, 238. 

 /1/ic/iitAerium, 428 

 Aneyloeerat, 291. 292. 



t, 268. 

 , 347, 348. 

 Angelina, 161, 167, 169. 

 Angiosperms 473. 

 ^,j7i>,361. 



Animal Kingdom, divisions of, 44-52. 

 Anisopus, 533. 

 Annelida, 136 : characters of, 136 ; distri- 



bution of, in time, 137. 

 Annvlaria, 478, 482, 483, 494. 

 Annuloida, 103. 

 Annulftsa, 29, 47 ; characters of, 136 ; dis- 



tribution of, in time, 136. 



