Mussel-shell river, 69, 77. 
Myalina, 
Mylognathus, 101. 
ilide, 81. 
Néitil, 50, 66, 69, 81. 
ecera, 
N ebraska, ooustusians about, 11. 
Newberry, Dr., 123. 
Neuwied, Prince of, 2. 
Nice, 130. 
Nicollet, report of, 2 
gece on Pseudo Yoledis Phe- 
nom 75. 
mas sandhills of, 15. 
Norwood, Dr., 38. 
Norwood, Dr., in regard to Permian 
beds in fitiscis, 59. 
North Platte, 15. 
Nucleus of mountain ranges, 117. 
Nucula, 90. 
Nuculide, 91. 
Obolus, 23, 37. 
O’Fallon’s creek, 97. 
Ogden ferry, 51. 
Old Woman’s branch, 19, 20. 
Omadi, 10. 
Omaha City, 10. 
Omaha Mission, 9. 
Opening creek, 80. 
Oregon, 131. 
Oreodon, 14, 106. 
Oreodon Culbertsoni, 14. 
Orthisina, 40. 
Osawkee, 42. 
Ostrea, 91, 103. 
Ostreade, 91, 108. 
Ostrea congesta, 10, 91. 
Otoe Village, 6. 
Owen, Dr. D. D., 3. 
Pacific Railroad reports, 37. 
Pacific coast, 115. 
Puleocherus, 106. 
VOL. XI1.—28 
OF THE UPPER MISSOURI. 
Papillion creek, 6. 
Parahippus, 106. 
Patent Office report, 131. 
Pawnee Village, 11. 
Pebbles, water-worn, 31. 
Pectunculus, 10, 90. 
Pentacrinus, 25, 123. 
Permian, 33, 34, 38, 55. 
Permian fossils, reference to, 53. 
Pholodomya, 87. 
Physa, 102. 
Pierre’s hole, 119. 
Pillsbury, Mr., 48. 
Pike’s Peak, 118. 
Pinau’s spring, fresh-water shells 
of, 14 
Pinna, 45. 
Planarian worms, trails of, 25. 
Planorbis, 3, 102 
Plastic clay, with fish remains and 
other fossils, 21. 
Platte Valley, 5. 
Platte, Lower, 7. 
Platte river, 5. 
North Platte, 118. 
Platte country, 4. 
Pleurophorus, 50. 
Pleurotoma, 84. 
Pleurotomaria, 22, 66. 
Pliocene, 13, 105. 
Pebrotherium, 106. 
Polygyra, 102. 
Popo Agie, 119. 
Porcupine river, 77. 
Post Pliocene eile 11, 15. 
Post Pliocene, 12, 104. 
Potsdam sandstone, 16, 26. 
Potsdam sandstone, conglomerate 
character, 26. 
Potamomya, 103. 
Powder river, 116. 
Procamelus, 106. 
Productus, 5, 6, 16, 62. 
Promontory Point, 37. 
Protohippus, 107. 
Protomeryzx, 106. 
217 
Prout, Dr. H. A., 3. 
Pseudobuccinum, 84. 
Pseudelurus, 107. 
Pterophyllum, 123. 
Ptychoceras, 83. 
Pyrula, 
Quaking Asp river, 77. 
Quaternary deposits, 42, 107. 
Quartz, white, 35. 
Quensted, Prof., 68. 
Radiata, 91. 
Rawhide Butte creek, 15. 
Raynolds, Captain Wm. F., 114. 
Red arenaceous beds, 117. 
Red buttes, 118. 
Remains, vertebrate, in superficial 
deposits, pliocene, 13, 110. 
Remains, mammalian and chelo- 
nian, 3, 104, 106, 107. 
Republican river, 58. 
Retzia Mormoni, 16, 64. 
Rhinoceros, 106. 
Rhynconella uta, 16, 63. 
Richardson, Sir John, 36, 99. 
Ridges of elevation, Black Hills, 21. 
River terraces, 112, 113. 
Rocks, trappean, 34. 
Rocks, granite, stratified, azoic, and 
Russia, fossils fren, 388. 
Sabal lamononis, 130. 
Sage creek, 4, 29. 
Saline valet, analysis of, 76. 
Sandstone, gray, 25. 
Sandstone, micaceous, 6. 
Sandstone, ferruginous, 8. 
Sandstone et 16. 
Sandstone, red, No. 1, 9. 
Sandstone, Potsdam, of Black Hills, 
rf 
Sandstone, white, 25. 
Sandstone Potsdam, 25. 
- Sandhills, notice of, 15. 
Santa Fe road, 39. 
Sarpy, P. A., trading post, 5. 
Saskachewan, 36. 
Saurian bones, 28. 
