INDEX. 
591 
Ophiolepis leckenbyi, Scarborough, 166 
,, murravi, Staithes, 166 
Ophiura milleri, 68, 69 
Ophiuridce, 65 
Ophiuroidea, 166 
Lias, 110, 304 
Oppel, A., 84 
Ord, J. W., 69 
Ordnance Survey, 40 
Maps, 80 
Ore and Stone Mining, 426 
„ Cleveland, 208, 399 
Deposits, Treatise on, 186 
„ Supplies, Iron, 388 
Ores, Distribution of, 113, 176 
„ Iron, 114, 123, 131, 141, 198, 258 
,, „ Analyses, 84 
„ Historv, 224 
,, Lead, .131, 178 
,, Metallic, 405 
,, Rare Elements in, 295 
„ Treatise, 263 
„ Zinc, 131 
Organic Remains, Index of, 426 
Oxford Clay, 62 
Organisation of Brachiopoda, 108 
Coal Plants, 127, 156, 
166, 172, 181, 254 
Fossil Plants, 208, 227, 
236, 260, 269, 279, 
290 
Orgreave Collierv, 467 
Map, 487 
Origin of Arctic Plants, 301 
Boulders, 275 
British Fauna, 381 
„ Flora, 316, 381 
Building Stones, 450 
Cambridge Boulders, 415 
Carboniferous Terraces, 148 
,, Caves, 410 
Chalk Dales, 199 
,, Gravel, 185 
Chellow Dean, 430 
Chert, 205 
Chlorine in Waters, 331 
,, Clay Ironstone, 131 
Cleveland Ironstone, 86, 384 
Moors, 390 
Coal, 193, 332, 392 
„ -balls, 405 
,, Concretions, 348 
Coums, 139 
Gravels around Hull, 307, 317 
,, " Gypsum, 395 
Humber, Mud, 171, 307 
Ironstone, 344 
Jet, 117, 337, 346, 384, 404 
,, Kingston-upon-Hull, 420 
" „ Knolls, 397 
,, Lake Basins, 145 
I Origin of Medicinal Springs, 395 
Millstone Grit, 90, 450, 460 
Minerals, 467 
Moorlands, 450 
Mountain Ranges, 199 
Pennine Peat Moors, 364 
' Rock Basins,' 110 
Rosedale Ironstone, 344 
,, Sandstones, 161 
Scenery, 118 
Sheffield Flood, 102 
Small Pits on Moors, 298 
Stratified Rocks, 165 
Surface Features, 296 
Trias, 377, 388, 393 
Valleys, 126, 391 
,, Yorkshire Lakes, 471 
Ormsby, Map, 492 
Ornament of Trigonia, 441 
Orthacanthus, 162 
Orthoceras, Millstone Grit, 132, 160 
Orthoceras pennatum, 132 
Osaxn, E., 45, 64 
Oscillations in Sea Level, 336 
Osmondthorpe, Map, 484 
I Osmotherlev, 412 
Map, 485 
Ossett, 407 
Boring, Map, 488 
Ossiferous Caverns, 304 
Osteology of Elephas, 157, 167 
Ostracanthus dilatatus, 102 
Ostracoda, Carboniferous, 159, 190, 197 
251, 276, 286 
Liassic, 266 
Rhaetic, 266 
Ostreida, Cretacious, 465 
Oswald, S., 185 
Otley, 328, 238, 427 
,, Chevin, 256 
„ Map, 478, 483, 484, 498 
,, Millstone Grit, 434 
Oughtibridge, Map, 502 
Oulton, 252, 253 
„ Park, 117 
Ouse Bridge, 66 
,, Valley, Alluvium, 155 
,, Work of,' 316, 317 
Outbursts of Gas, 124, 126 
,, ,, Barnsley, 161 
New Oaks, 147 
Outfall of Humber, 119 
Rivers, 290 
Output of Coal, 301 
Metals, 303 
Minerals, 322 
Outram, B., 24 
Ovenden Naturalists' Society, 143, 181 
' Overflow Channel,' Newton Dale, 
383 
Overflow Valley, Sugden End, 446 
