214 
ON THE GEOLOGY AND NATURAL HISTORY 
Academy, Pa., 2, 4. 
Academy of Sciences, St. Louis, 38. 
Acanthocladia, 61. 
Acepliala, 79. 
Acer fossil, 98. 
Acirsa, 84. 
Acroloxus, 103. 
Actcon, 86. 
Agricultural resoui’ces of Kansas, 59. 
“ “ Nebraska, 79. 
Agriochccrus , 106. 
uElurodon, 107. 
Albany Institute, 38. 
Allorisma terminalis, 5. 
Alluvium, 111. 
Amauropsis , 84. 
Ammonitidce, 81. 
Ammonites , 2, 22, 23, 81, 82. 
Amphicyon , 107. 
Anatinidai, 87. 
Anchitherium, 106. 
Ancyloceras, 82. 
Ancylus , 103. 
Anisomyon, 85. 
Annelida , 81. 
Anomiadce, 91. 
Anomia, 91. 
A plexus, 102. 
Aporrhaidce, 85. 
Aporrhais, 85. 
Aptychus, 83. 
Area, 90. 
Archceocidaris, 40, 42. 
Arcidce , 90. 
Arkansas, 117. 
Arragonite, 75. 
Articulata, 81. 
Ashgrove Spring, 15. 
Asia, 130. 
Astartidce, 89. 
As/orrte, 89. 
Atlantic, 119. 
Audubon, Mr., 3. 
Avellana, 86. 
Avicula, 89. 
Aviculidce, 89. 
Axmce, 90. 
Axznws, 50. 
Azoic rocks, 18, 19, 35, 120, 131. 
Aztec Mountains, 37. 
INDE X. 
Baculitcs, 2, 21, 83. 
Bad Lands, 8. 
Bad Lands on the Niobrara, 14. 
Baird, Prof. S. F., 138. 
Ba/cevellia, 50. 
Baptist Mission, 45. 
Barometrical profiles, 115. 
Basaltic rocks, 24, 28, 35, 120, 
131. 
Basaltic columns, 35. 
Bates’s fork, 127. 
Bear creek, 29. 
Bear’s Paw, 34, 120. 
Bear Peak, 28. 
Beaver creek, 11. 
Beech, fossil leaves of, 3. 
Belemnitella, 69, 81. 
Belemnitidce, 81. 
Bellevue to the mouth of Elkhorn, 5. 
Bellerophon, 22. 
Belt Mountains, 119. 
Big Blue river, 49. 
Big Horn river, 4, 119. 
Big Sioux river, 1,9. 
Big Stranger creek, 41. 
Bijoux Hills, 33. 
Bituminous clays of No. 4, 76. 
Black Hills, valley of, 25, 116. 
Blackbird Hill, 9. 
Blackbird Mission, 8. 
Black Mink, Putorius nigrescens, 
138. 
Blue limestone, flexibility of, 24. 
Bottom prairie, 108, 111. 
Bos Americanus; limits; decreasing 
in number, 150; number of in¬ 
dividuals killed annually, 151. 
Boulder, granite, 6. 
Box Elder creek, 127. 
Bracbiopoda, 62. 
Bryozoa, 61. 
Bucardia , 88. 
Buccinidce, 84. 
Buccinum, 84. 
Buck, Yon, 2. 
Buffalo mound, 45, 47. 
Bulla, 86. 
Bullidce, 86. 
Bulimus, 102. 
Busycon Bairdi, 80. 
Butte aux Gres, 80. 
Canada, 36. 
Cache la Poudre creek, 120. 
Calamus river, section of Pliocene 
strata, 12. 
Cam's, 107. 
Cannon-ball river, 77. 
Capulus, 85. 
Caprinella, 79, 91. 
Carboniferous, ft, 6, 15, 16, 17, 27, 
35, 38, 121, 129, 132. 
Cardium, 88. 
Card id ae, 88. 
Castor, 107. 
Catalogue of Cretaceous fossils, 81. 
Catalogue of Tertiary fossils, 101. 
Catalogues; Carboniferous fossils, 
61; Cretaceous fossils, 81; Ter¬ 
tiary species, 101, 106; Minerals 
and geological specimens, 131; 
Mammals, 138; Birds, 151. 
Central Bluffs, 8. 
Cephalopoda, 79, 80. 
Cerithiopsis, 84. 
Cerithiopsidce, 84. 
Cerithiadce, 101. 
Cerithium, 101. 
Cervus, 113, 106. 
Cetacean, Vertebrae of, 78. 
Chalcedony, seams of, 30. 
Chalk bluff, 71. 
Chalk, 2. 
Chamcvrops humilis and palmetto, 
130. 
Chapman’s creek, 58. 
Cherry creek, 21. 
China, 130. 
Chcetetes, 41. 
Chccropotamus, 106. 
Chonetes, 5, 6, 54, 63. 
Chugwater creek, 120. 
“ Citadel,” 125. 
Cladodus occidentals, 52. 
Climatology of the West during the 
Tertiary Period, 130, 131. 
Coal mine, Kansas, 44. 
Coal Measures, upper, 5. 
Coal in Southeastern Nebraska, 6, 
11 . 
Coast range, 131. 
