INDEX 



465 



/ 



-y 



Nephronajas ligamentina, 97, 125, 186, 288, 



336, 383. 

 Newberry, 197, 318. 

 New Buffalo, Mich., 12. 15, 19. 

 New England States, 116. 

 Newton Co., Ark., fossils, 210. 

 Niagara Falls, 83, 84, 114, 344. 

 Niagara gorge, 223. 

 Nicholson, 79. 

 Nipissing Great Lakes, 105, 116, 120, 132, 



133, 136, 137, 155, 161. 

 Nipissing stage, 60, 84, 94, 95, 136, 137, 138, 



155, 157, 161, 163. 

 Noah's bone-yard, 272. 

 North Avenue, Chicago, 94. 

 North Clark Street, Chicago, 60. 

 Norton, 230, 231, 250, 288. 

 Norwood Park, Chicago, 69, 106. 

 Noyes Street, Chicago, 63. 

 Nylander, 155, 156. 



Nymphaea advena, 27, 81, 91, 101, 185, 380. 

 Nyssa sylvatica biflora, 204, 211, 381. 



Oak Park, Chicago, 54, 65, 61, 69, 86, 106. 

 Oakton Avenue, Chicago, 46. 

 Obliquaria cornuta, 125. 

 Obliquaria reflexa, 30, 37, 82, 97, 101, 125, 



186, 193, 383. 

 Obovaria circulus, 158, 186, 193, 383. 

 Obovaria ellipsis, 125, 160, 164, 186, 193, 



383. 

 Ochotona palatinus, 208, 214, 397. 

 Oculina robusta, 14. 

 Odocoileus laevicomis, 213, 208, 395. 

 Odocoileus osceola, 374. 

 Odocoileus virginianus, 56, 64, 86, 89, 100, 



153, 154, 191, 274, 283, 300, 311, 315, 341, 



354, 359, 395. 

 , Odocoileus whitneyi, 354, 359, 395. 

 Oecology of Wilmette Bay, 103-105. 

 Ogden Avenue, Chicago, 54, 65. 

 Ogden ditch, Chicago, 54, 65, 66, 73, 85. 

 Old soils of Chicago, 64. 

 Olophrum arcanum, 331, 340, 392. 

 Olophrum celatum, 331, 340, 392. 

 Olophrum dejectum, 331, 340, 393. 

 Olophrum interglaciale, 291, 340, 393. 

 O'Neill, 16. 



Omphalina fuliginosa, 157, 189, 362, 389. 

 Omphalina inornata, 308, 339, 389. 

 Omphalina kopnodes, 362. 



Ontario basin, 74, 86, 93, 113, 114, 116. 



Orchestes avus, 332, 341, 393. 



Oreohelix cooperi, 288. 



Oreohelix iowensis, 252, 254, 255. 282, 287, 



288, 297, 308, 339, 348, 351, 352, 359, 361, 



362, 389. 

 Orr, 251. 



Ortmann, 92, 199, 205, 206, 277, 302. 

 Oryzomys palustris, 374. 

 Oryzopsis asperifolia, 185, 378. 

 Osborn, 207, 218, 283, 271-274. 

 Osmotherium spelaeum, 208, 214, 397 

 Ostracod, 296, 339, 390. 

 Ostrea virginiana, 14, 15, 329, 336, 379. 

 Ottawa valley, 93, 116, 176. 

 Over, W. H., 261. 

 Ovibos moschatus, 132, 173, 191, 316, 341, 



359, 396. 

 Ovibos-Rangifer zone, 372. 

 Owen, D. D., 263, 350. 

 Owen, Luella, 356. 

 Oxycoccus palustris, 332. 

 Oxyporus stiriacus, 331, 340, 392. 

 Oxyria digyna, 170, 185, 380. 

 Ozark Mountains, 199. 



Packard, 177. 



Paisley, 182. 



Palos Park, Chicago, 69. 



Palos Springs, Chicago, 15, 77, 79, 80. 



Paludestrina nickliniana, 99, 140, 187, 385. 



Paludina, 126. 



Paramylodon nebrascensis, 209, 213, 394. 



Paraptera gracilis, 97. 



Patrobus decessus, 331, 340, 391. 



Patrobus frigidus, 331, 340, 391. 



Patrobus gelatus, 331, 340, 391. 



Patrobus henslowi, 291, 340, 391. 



Peale, 315. 



Peat, 393. 



Peattie, 18. 



Peacatonica basin, 295. 



Pecten, 14. 



Pelycictis lobulatus, 208, 214, 397,. 



Peorian soil, Chicago, 65. 



Penhallow, 3, 6, 72, 90, 149, 150, 178, 202, 



279, 292, 330, 334. 

 Pensauken formation, 207. 

 Peorian interval, 118, 167, 219, 252, 263, 293, 



317, 319, 325, 360, 373, 376, 402. 



L*-4 



