740 



GENEEAL INDEX. 



[xSOV. I906,. 



Oct op I i cat a-subzone in Mendip area, 

 327-28. 



Officers, election of, iii, xxiv. 



Ogygia-marginata beds in W. Caer- 

 inarthenshire, 607, 608. 



Ogygia sp. (Ordovician), 426, 428 & 

 pi. xl. 



Oigh-sgeir (Hebrides), pitchstone iden- 

 tical w. that of Sgurr of Eigg, 

 48. 



Old Eed Sandstone of Lake District, 

 lxxxii ; O. R. S. earth-movements, 

 ibid., Ixxv et seqq. ; O. R. S. denu- 

 dation, ibid., Ixxxi-lxxxii ; O. R. S. 

 of Ludlow district, 197 et seqq., 

 209 et seqq. ; N. & S. types of, 221 ; 

 O. R. S. of Llangynog district, 226, 

 230-32, 247-48. 



Oldham, R. D., on the Constitution 

 of the Interior of the Earth, as 

 revealed by Earthquakes, 456-73 



Oligocene calcareous sandst. in Dun- 

 edin district (N.Z.\ 389-90. 



Omihi (N.Z.), trachytes of, 399, 400. 



Omospira, generic characters of, 552- 

 53. 



orientalis, sp. nov., 553-54 & 



pi. xliii. 



Onibury (Shropshire), Upper Silurian 

 in neighbourhood of, 214-18 w. 

 map & sects. 



Oolitic plant-bearing sandstones of 

 Eigg, 62, 63. 



Ophitic diabase of Tre-hyrn, 244 & 

 pi. xxvi (microscope-sect.) ; of 

 Llanboidy, &c, 601,643. 



Optic axial angle, of biaxial mineral, 

 method of determination, iv. 



Ordovician of Llangynog district, 

 226-30 ; Ordovic. trilobites & grap- 

 tolites fr. Bolivia, 426 et seqq., 431- 

 32 & pi. xl; Ordovic. rocks of W. 

 Caermarthenshire, 597-643 figs. & 

 pi. xlvi (map) ; see also Arenig, 

 $c. 



Orsino & Orsirora Lakes (Switzer- 

 land), origin of, 185-87. 



Orthis Carausii in W. Caermarthen- 

 shire, 605 et seqq. 



Orthis-gvits & O/fo's-niudstones (Are- 

 nig), in W. Caermarthenshire, 605- 

 608. 



Ortbite, see Allanite. 



Orthothetes (Derby a) senilis, var. 

 (?) anomala, 309-10. 



Oscillatory motion of European and 

 African continents contrasted, 85- 

 86. 



Otago Heads (N.Z.), 384, 403, 410, 

 412; sect, at N. O. Head descr. & 



fig., 417-18 ; Otago Peninsula, see 



Dunedin. 

 Otley, J., & his woi'k in the Lake 



District, Ixviii. 

 Ottajano (Italy), 477, 481. 

 Overlap of Clay -with -Flints on to 



Eocene tracts, 147-4S. 

 Overthrust at base of Skiddaw Slates, 



lxxvi, xciv. 

 Oxfordian ammonites, developmental 



stages of. 450-51. 



Pala?ontological notation, suggested. 

 3U5 ; pal. MS. names, suggested 

 mode of quotation, 449. 



Palaeczoic movements in Lake District 

 & their effects, Ixxv-lxxxii ; Palaeo- 

 zoic cherts of Rio Beni, 97 ; see also 

 Arenig, Carboniferous, Qc. 



Pale "Wood, Great Pale, Old Pale 

 (Caermarthen), 640, 641. 



Pandy - bach ( Montgomery ), 665, 

 667. 



Papanui Inlet (N.Z.), 382, 386 ; tin- 

 guaite of. 396 ; Papanui Dolerite, 

 410-11 w. chem. anals., 422. 



Parcau (Caermarthen). 637, 638. 



Paredao Cataract (Rio Madeira), 

 gneiss & black-filmed rocks of, 103- 

 105. 



Paris, E. T., 577. 



Park -Hill Series correlated with 

 Cyatha.ronia-~Beds of Rush, 303. 



Parsons, H. F., exhibits Carb.-Limest. 

 fossils fr. Mendip Hills, vii. 



Passage-Beds, see iSyrivgotkyris-Zone. 



Peach, B. N., 48, 53, 58, 61. 



Peclerneira Cataract (Rio Madeira), 

 gneiss of, 103. 



Peldon (a verv hard, flinty stone), 525. 



Peltura sp. (Upper Cambrian), 425, 

 426-27 & pi. xl. 



Pencilpost (Caermarthen), 606. 



Pendine Conglomerate, correlat. w. 

 Rush Conglomerate, 285, 288. 



Pen-gelli-uchaf (Caermarthen), dia- 

 base N. of, 237, 245 ; Old Red Sand- 

 stone at, 231. 



Pen-Hill pericline (Mendip), & Avoi;- 

 ian exposures, 337, 340, 343, 347, 

 349-50, 352. 



Pen-y-Graig (Montgomery), 669. 



Pen-y-Moelfre (Caermarthen), 226. 

 227, 228, 



Penlan (Caermarthen), 601, 621, 630, 

 631, 637. . 



Pennant (Montgomery), Llandovery, 

 &c. rocks near, (i85-87 at. mop. 



' Pennant Metalliferous Slates,' 648, 

 650. 



