NEW YORK STATE MUSEUM 



Nairn, 53, 54. 



Naples, 17, 20, 21. 58, 63, 70, 72. 

 Naples shale, 17, 57, 58, 156. 

 Neoceratodus, 88, 89, 93, 94, 95, 100, 104, 

 105, 106, 108, 109, no, 115, 121, 132, 

 133, 149. 158; dentition of Dinichthys 

 and, 96-97 ; dentition of Mylostoma 

 and, 97-99. 

 forsteri, 132. 

 New Albany beds, 18, 133. 

 New Brunswick, 28. 

 New Bufifalo, la., 160. 

 Newberry, John Strong, cited, 7, 51, 52, 60, 

 63. 68, 75, 76, 78, 79, 82, 85, 87, 90, 91, 

 99, loi, 102, 103, 105, 109, III, 113, 115, 

 117, 119, 125, 138, 141, 143, 147, 149, 157, 

 162, 163, 169. 

 Niagara beds, 12, 59, 73. 

 Nictaux Falls, N. S., 13. 

 North Evans, 17. 

 North Liberty, la., 74, 161, 162. 

 North Walton, 74. 

 Norwood, cited, 100, 102. 

 Nova Scotia, 13. 



Oesel, 40. 



Oestophorus, 157. 



Old Red sandstone, 26, 29, 159, 164, 166, 



171, 177, 189; upper, 53. 

 Olean, 88. 



Olean conglomerate, 21, yy. 

 Onchus, 73. 



sp., 12. 



clintoni, 12, y^. 



pennsylvanicus, 12, 73. 



rectus, 22. 74. 

 Oneonta beds, 17, 132, 133, 139. 

 Onondaga fish fauna, origin, 191. 

 Onondaga group, 30. 

 Onondaga limestone, 9, 13, 14, 70, 79, 84, 



85, 112, 113, 115, 118, 169, 187, 188. 

 Onychodontidae, 23, 168-69. 



Onychodus, 164, 168, 169, 193. 



sp., 16, 196. 



hopkinsi, 169, 197, 200, 212. 



ortoni, 19. 



sigmoides, 14, 16, 168, 169, 196, 200. 

 Oracanthus, 78. 



abbreviatus, 79. 



fragilis, 79. 



granulatus, 79. 

 Oran, 15, 169. 

 Oriskany sandstone, 13. 

 Orodus, 75. 



elegantulus, 18. 

 Osteolepis, 167. 

 Osteostraci, 23, 27, 28, 31. 

 Ostracoderms, 90, 180. 

 Ostracophori, 23, 24-54, 90, 95, in, 148, 



179, 180. 

 Owen, cited, 100, 102, 164. 

 Oxford, 17, 133, 139. 



Paired fins, ol Cladoselache, 56; dawn of, 



180-81 ; as paddles, 181-82. 

 Palaeaspis americana, 12. 



bitruncata, 29. 



elliptica, 29. 



sericea, 29. 

 Palaeomylus, 66, 67, 73, 149, 193. 



crassus, 13. 



frangens, 13. 



greenei, 15, 153. 

 Palaeoniscidae, 23, 170, 171-72. 

 Palaeoniscus ? antiquus, 18, 171. 



Pdevonicus, 17, 171. 



? reticulatus, 18, 171. 

 Palenville, 139. 

 Paleoniscid fishes, 165. 

 Palaeaspis, 27, 28. 



americana, 29-30. 

 Pander, C. H., cited, 36, 40, 114, 157, 



164. 

 Parker, cited, 158. 



