396 
PN oo 
Acadian Group, 79. 
Acer, 308. 
Acervularia, 119, 173. 
Acidaspis, 123. 
Acorn-shells, 267. 
Acroculia, 128. 
Acrodus, 214, 242, 275; nobilis, 242. 
Acrotreta, 110. 
Acroura, 120. 
Actinocrinus, 175. 
LEeglina, 108. 
Aipiornis, 348. 
Agnostus, 85-87, 108 ; rez, 85. 
Alces malchis, 354. 
Alecto, 108. 
Alethopteris, 136, 165, 196. 
Alge (see Sea-weeds). 
Alligators, 218, 297. 
Alnus, 262. 
Amblypterus, 188; 
Ambonychia, 111. 
Ammonites, 187, 212-214, 237-239, 272; 
Humphresianus, 238 ; bifrons, 238, 
Ammonitide, 239, 272, 285, 294. 
Amphibia, 189; of the ‘Carboniferous, 
189-191; of the Permian, 200; of the 
Trias, 215-217; of the Jurassic, 242; of 
the Miocene, 313. 
Amphicyon, 322. 
Amphilestes, 253. 
Amphispongia, 118. 
Amphistegina, 311. 
Amphitherium, 253 255; Prevostii, 254. 
Amphitragulus, 317. 
Amplexus, 173; coralloides, 174. 
Ampyx, 108. 
Ananchytes, 266. 
Anchitherium, 301, 302. 
Ancyloceras, 272, 273; 
273. 
Ancylotherium Pentelici, 315. 
Andrias Scheuchzeri, 313, 314. 
Angiosperms, 261, 262. 
Animal Kingdom, divisions of, 375-378. 
Anisopus, 206. 
Annelida, of the Cambrian period, 82, 
83; of the Lower Silurian, 107; of the 
Upper Silurian, 122, 123; of the De- 
vonian, 143, 144; of the Carboniferous, 
178. 
Annularia, 137, 196, 207. 
macropterus,. 188. 
Matheronianus, 
Anomodontia, 220. 
Anoplotheride, 302. 
Anoplotherium, 302, 303 ; commune, 303. 
Ant-eaters, 299, 315, 349, "350, Dass 
Antelopes, 317. 
Anthracosaurus Russelli,. 190. 
Anthrapalemon gracilis, 180. 
Antilocapra, 318. 
Antilope quadricornis, 318. 
Antwerp Crag, 325. 
Apes, 323. 
Apiocrinus, 231. 
Apteryx, 346, 348. 
Aqueous rocks, 15. 
Arachnida of the Coal- -measures, 181. 
Aralo-Caspian Beds, 326. 
Araucaria, 262. 
Araucarioxylon, 170. 
Arca, 198 ; antiqua, 199. 
Archeocidaris, 178. 
Archeeocyathus, 82. 
en yx, 252, 281; macrura, 252, 
25 
Archeospherine, 75. 
Archimedes, 184; Wortheni, 183. 
Archiulus, 182. 
Arctic regions, Miocene flora of, 310. 
Arctocyon, 304. 
Arenaceous rocks, 20. . 
Arenicolites, 83 ; didymus, 88. 
Arenig rocks, 92, 94. 
Argillaceous rocks, 20. 
Armadillos, 299, 351, 353. 
Artiodactyle Ungulates, 300, 317. 
Asaphus, 108; tyrannus, 107, 108. 
A scoceras, 130. 
A spidella, 76. 
Aspidura loricata, 210. 
Astarte borealis, 338. 
A sterophyllites, 137, 196. 
Asterosteus, 152. 
Astreide, 231. 
Astreospongia, 118, 139. 
Astylospongia, 98 ; preemorsa, 98. 
Athyris, 110, 127, 147, 198 ; subtilita, 185. 
Atlantic Ooze, 22, 23. 
Atrypa, 127; congesta, 127; hemisphee- 
ried, 127; reticularis, 147, 148. 
Auger-shells, 293. 
Aurochs, 356. 
Aves (see Birds). 
