INDEX. 



Note.— An asterisk (*) after the number of a page indicates that there is a reference on the 

 page to a figure of the species or object mentioned; and a section-mark ($) implies that the 

 page contains a definition, explanation, or characteristic of the word or object mentioned. 



Acalephs, 158,$ 162. 



range of, in time, 400. 

 Acanthoteuthis, 451. 



antiquus, 460.* 

 Accipenseroids, 280.$ 

 Acephals, 155, 157.$ 



range of, in time, 401. 

 Acid-spring, 248. 

 Acrodonts, 346.$ 

 Acrodus minimus, 277.* 



nobilis, 277.* 

 Acrostichites oblongus, 420. 

 Acrogens, 166.$ 

 Acrotreta, 184. 

 Actinia, 148,* 163.$ 

 Actinoid Polyps, 163.$ 

 Actinolite, 60.$ 



rock, 78.$ 

 Actinocrinus Christyi, 312* 



longirostris, 161,* 312* 



proboscidialis, 312.* 



tenuiradiatus, 209. 



unicornis, 312.* 

 Actinocyclus bioctonarius, 



512* 

 Actinoptychus biternarius, 

 512* 



senarius, 166,* 512.* 

 Adelomys, 529. 

 Adirondack iron-mines, 141. 

 iEchmodus, 455.* 

 .Eglea, 358. 

 ^Epiornis, 580. 

 iEtkophyllum speciosum, 434. 



stipulare, 434. 

 Africa, Cretaceous in, 481. 



system in reliefs of, 27.* 

 Agalmatolite, 61.$ 

 Agassiz on criteria of rank 

 among animals, 592. 



on Ganoid teeth, 280. 



on glaciers, 670, 752. 



on fishes, 278, 423. 



on synthetic types, 393. 

 Agate, 55.$ 

 Age of Fishes, 265. 



of Mammals, 505. 



of Man, 573. 



of Man, reality of, 583. 



of Mollusks, 167 



of Reptiles, 414. 

 Ages, names of, 130. 



subdivision into, 116.$ 

 Agnostus Amencanus. 193. 



Agnostus Canadensis, 193. 



lobatus, 215* 



Rex, 194* 

 Agriochoerns, U. Missouri, 519. 

 Air-breathers in Devonian, 



296. 

 Aix, fishes of, 529. 

 Alabama, Carboniferous in,322. 



Clinton in, 234. 



coal in, 323. 



Cretaceous in, 470. 



Hudson in, 218. 



Millstone grit in, 322. 



Subcarboniferous in, 307. 



Tertiary in, 508. 

 Albert coal, 309. 

 Albian group, 480. 

 Albite, 56.$ 

 Alca impennis, 580. 

 Alcyouium, 162.$ 

 Alcyonoid Polyps, 163.$ 

 Alethopteris, 338, 355. 



Lonchitidis, 340,* 342. 



marginata, 342. 



Serlii, 339. 

 Aleutian Islands, 36. 

 Algte, 165, 167,$ 748. 



in Hamilton beds, 283. 



only plants of Potsdam 

 Period, 178. 

 Alleghany epoch. 309. 

 Allorisma Minnehaha, 371. 



subcuneata, 348.* 

 Alluvial formations, origin of, 



644. 

 Alluvium, 74.$ 

 Alps, elevation of, 533. 

 Aluminium, 52.$ 

 Alum shale, 74.g 

 Amber, 69.$ 

 Amauropsis paludinseformis, 



479. 

 Amblyrhynchus, 499. 

 Ambonychia bellistriata, 213.* 



radiata, 221* 

 Ambulacral pieces, 159.$ 

 America and Europe,di fference 



in progress of, 394. 

 America, mean height of, 15. 



submerged eastern border 

 of, 385. 



system in reliefs of, 24.* 



the forest continent, 394. 



trends of land of, 37. 



American character of Miocene 



plants of Europe, 525. 

 Amethyst, 55.$ 

 Amia, 280.$ 

 Amianthus, 61.$ 

 Ammonites, 156, 450, 472, 496. 



Altenensis, 465. 



bifrons, 464. 



biplex, 446, 465. 



bisulcatus, 454* 464. 



Bogotensis, 487. 



Braikenridgii, 464. 



Bucklandi, 464. 



bullatus, 464. 



Callovianus, 465. 



catenatus, 464. 



complexus, 479. 



concavus, 446. 



Conybeari, 464. 



cordatus, 460. 



cordiformis, 446.* 



coronatus, 465. 



decipiens, 465. 



Delawarensis, 479. 



Didayanus, 487. 



Discus, 464. 



Dumasianus, 487. 



galeatus, 487. 



giganteus, 465. 



heterophyllus, 464. 



Humphrej r sianus, 460,* 

 464. 



Jason, 460,* 465. 



Lewesiensis, 482. 



lobatus, 479. 



margaritatus, 454, 464. 



McClintocki, 446. 



Nodotianus, 454,* 464. 



percarinatus, 478, 487- 



Placenta, 477,* 479. 



plicatilis, 465. 



prselonga, 487. 



radians, 464. 



refractus, 460. 



rotundus, 465. 



serpenthms, 464. 



simplex, 487. 



spinatus, 464. 



striatulus, 460, 464. 



Tethys, 487. 



Texanus, 478. 



tornatus, 435.* 



Vandecki, 487. 



vespertinus, 478, 479, 487. 

 773 



