INDEX. 



A star (*) 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. 



Aa (lava-stream), 287§*, 288, 289 



Aaleiiian, 790 



Aar Glacier, 237, 243, 251 ; investi- 

 gations by Hugi and Agassiz, 243 



Abies, 859 



Abietites dubius, 839 ; Linkii, 834 



Abrasion, 131, 159, 168, 202, 804, 

 805, 806, 941 ; assorts in propor- 

 tion to hardness, 169 ; see also 

 Glacial abrasion, Scratches 



Abrolhos Islands, 867 



Abyssal depths of the ocean, 229 



Abyssinia. 26 (plateau), 33, 34, 177 



Acacia, 921 



Acadian area of Carboniferous and 

 Subcarboniferous, 635 



— period. See Cambrian, Middle 



— protaxis, 444 



— Range, 389, 391, 732 



— Triassic area, 740, 741 



— trough, 461, 467, 536, 537, 541, 

 543, 558, 633, 708, 715, 732, 743 



— upturning, 736 

 Acalephs, 430§ 

 Acanthaspis armata, 588* 

 Acantherpestes, 701 ; major, 691 

 Acanthoceras LyeUi, 865; mammil- 



lare, 855, 865; Mantelli, 866; 



Ehotomagense, 866 

 Acanthodes, 620 ; affinis, 620* ; pris- 



cus, 620 

 Acanthodians, 416 

 Acanthopholis horridus, 863 

 Acanthotelson Eveni, 691 ; Stimp- 



soni, 678*, 691 

 Acephals, 424§ 

 Aceratherium, 926 

 Acervularia, 625 ; pentagona, 592 

 Achaenodon, 918 

 Achyrodon, 789* 

 Acid. See Boracic acid ; Carbonic ; 



Humus ; Organic ; Sulphuric 

 Acidaspis, 513, 515, 520, 521, 561, 



567, 568, 579, 586, 591, 599 ; Bar- 



randu, 565* ; Brightii, 565*, 567 ; 



callicera, 587*, 591 ; coronata, 567 ; 



hamata, 567 ; Jamesii, 520 ; Rom- 



ingeri, 587* 599 ; tuberculata, 561, 



562*, 578, 579 

 Acipenser, 928 



Acleistoceras, 591, 602 



Aclis robusta, 690 



Aconcagua, 296 



Acrocrinus, 690 



Acrodus, 772 (first), 783 ; minimus, 



416* 774 ; nobilis, 416* 

 Acrogens, 435§ 



Acrolepis, 705 ; Sedgwickii, 707 

 Acrotheie, 481 ; Matthewi, 475* 

 Acrotreta, 520 ; gemma, 471*, 516, 



573 ; subconica, 673 

 Actinia, 429*, 431§, 516 

 Actinoceras, 501, 546, 549, 567 ; 



Bigsbyi, 506, 508*, 514; crebri- 



septum, 516, 524 ; verum, 866 

 Actinoconchus planosulcatus, 646 

 Actinocrinus, 520, 567, 597, 646, 



690 ; proboscidialis, 640*, 646 ; 



simplex, 567 ; tenuistriatus, 625 

 Actinocyclus Ehrenbergii, 894* 

 Actinoids, 4:31§, 525 

 Actinolite, 67*§ 

 Actinolyte, 89§ 

 Actinopteria, 621 

 Actinoptychus senarius, 437*, 894* ; 



undulatus, 894* 

 Adams, Mt., 296 

 Adapisorex, 925 

 Adelsberg cave, 207 

 Adipocere, 143, 154 

 Adirondack Mts. and region, 85, 



204, 884, 442; Arctic plants on 



summits of, 945 

 Adjutants, 923 

 Admete viridula, 984 

 Admiralty Islands, 38, 39 

 Adobe, 195§ 

 Adocus agilis, 850 ; beatus, 850 ; 



punctatus, 850 

 Adriatic Sea, 41, 212 

 ^chmina, 562 

 ^glea, 703 

 -lEglina, 521 ; grandis, 520 ; mira- 



bilis, 520 

 ^goceras capricornus, 781* ; Jame- 



soni, 790 ; planorbis, 790 

 ^gyrite, 85 

 ^lurodon, 919 

 ^on, 406§, 407 

 ^pyornis, 54, 1014, 1019 



1039 



Afghanistan, 920 



Africa, 17, 21, 22, 23, 26 (plateaus), 

 30, 31, 33*. 51, 165, 297, 894, 395, 

 406, 435, 674, 737 ; volcanoes in 

 the Bight of Benin, 296; coral 

 reefs of eastern coast, 145 



— , Carbonic rocks in, 632, 693 ; Up- 

 per Silurian, 563 ; Triassic, 632, 

 741 ; Jurassic, 873 ; Cretaceous, 

 857, 859, 878. See further South 

 Africa 



Agalmatolite, 68§ 



Agalmatoiyte, 84§ 



Agaricus, 688 



Agassizocrinus, 690 



Agassizodus, 692 ; variabilis, 680* 



Agathaumas, 828, 847; sylvestris, 

 847, 856 



Age of the Earth, 1023 



Agelacrinites, 516 



Agelacrinus Billingsi, 514 



Agnostus, 473, 475, 481, 482, 486, 

 500, 516, 520, 521 ; Acadicus, 

 476* ; interstrictus, 476* ; Kje- 

 rulfl, 482 ; nobilis, 473* ; Rex, 

 481*, 482 



Agnotozoic, 445, 447 



Agoniatites, 599 



Agriochcerus, 918 



Agriomeryx, 918 



Agui Range, 365 



Alabaster, 69§ 



Alachua clays, 891 



Alaska, 23, 234 (snow-line), 297, 582. 

 948 (fiords) 



— , Triassic in, 747; Cretaceous. 

 818, 820, 834, 868, 872 (climate); 

 Tertiary, 892, 893, 939 ; Glacial, 

 945, 948 



"Albatross," 60, 230 



Albemarle Sound, 224* 



Albert Mine, N.B., 639 



Albertia, 770 



Albertite, 662 



Albian group, 815, 858, 859, 865 



Albirupean group, 819 



Albite, 64^, 82, 83 



Alca impennis, 1014 



Alces Americanus, 1002 



Alcyonaria, 4S1§ 



