INDEX. 



Page. 



Acmsea occidentals 463 



Acta?onina ? subelliptica 463 



Actseon concinnus 463 



subellipticus 463 



Age of the igneous rocks 219 



Agraulus sp.? - 460 



oweni 342 



Agricultural lands 314 



Agricultural resources of the Sioux Keservation 5 



from Cheyenne to Fort Laramie 23 



Akera glans-oryza 437 



Allen. Mr. James, cited 252 



Allen. Mr. John W., cited 252 



Altitudes and positions 551 



Amauropsis paludinaefonuis 431 



Ammonites conradi 464 



cordatus 379 



cordifonnis 37§ 



rar. distans 380 



danse 464 



henry i 461 



nebrascensis 464 



placenta 464 



serrato-earinatus 440 



wyomingensis 440 



Amphibious Creek. [271 478 



[204] 473 



[205] 472,474 



[212] 475 



gold on 235 



Anchnra (Drepanocheilus) nebrascensis 429 



?snblevis 428 



Ancyloceras jenneyi 452 



nebrascense 451 



tricostatum 454 



? rrncum 464 



Andesite 483 



augite 483 



hornblende 483 



Anisomyon alveolus 432 



borealis 436 



patelliformis 435 



suboTatus 433 



Antecedent drainage 216 



Apatite in sanidin 507 



sanidin-trachyte 512 



trachyte 491,519 



Apetalae 536 



Page. 



Aphrodina ? tenuis 462 



Aporrhais biangulata 427 



meeki 426 



nebrascensis 429 



newberryi 425 



sublevata 428 



sublevis 428 



(Drepanocheilus) nebrascensis 429 



(Goniocheilus) eastorensis 427 



Area inornata 359, 405 



shumardi 405 



Archaean formations, correlation of 63 



gold from the 50, 54 



history, summary of 220 



island 214 



of Canada 45 



Castle Creek districl 262 



Rawhide Butte 27 



the Appalachian Mountains . - 47 



BlackHiUs 48 



headwaters of the Xiobrara 28 



Rocky Mountains 48 



subdivisions of the, in the Black 



Hills 41,50,63 



system, the 45 



thickness of the 61 



time, history of 62 



topography of the 48,212 



unconformity in the 62 



Arenicolites, sp. ? 333 



Assays of gold quartz 294 



Astarte evansi 413,417 



?fragilis 363 



inornata 368, 460 



Asterias? dubium 344 



Astronomical work 543 



Avelana concinna 463 



subglobosa 463 



Avicula curta 354 



linguiformis 384 



? fibrosa 386 



nebrascana 385 



(Monotis) temricostata 354 



(Oxytoma) mucronata 357 



Audubon, exploration by 7 



Augite-trachyte. 489 



Axiolite 485 



Bach, Leopold von, cited 7 



557 



