640 



GENERAL INDEX. 



Ordovician chert-beds of Scotland, 

 Proc. III. 



Origin of the Great Lakes of America ; 

 Dr. Spencer on the, 523 ; of serpen- 

 tine, 324; Southern Drift, 168, 

 Variolitic rocks of Mount Genevre, 

 324. 



Ostracnda, Devonian and Silurian, 7, 

 534. 



Overlap, the Cambrian, 259. 



Oxford, section near, 151. 



Oxford Clay of Huntingdonshire, Orni- 

 thosaurian remains from the, 429 ; 

 Peterborough, Crocodilian jaw from 

 the, 284 ; Peterborough, Pliosaurus 

 from the, 49 ; Wiltshire, Crocodilian 

 jaw from the, 285 ; Sauropterygians 

 from the, 36, 49. 



Oxfordshire, the Westleton Beds in 

 South, 140. 



Paignton, Devonian rocks near, 496. 



Pakefield, section near, 102. 



Palffiolithic Implements, 583, 587. 



Pala'ophycus, 606, 617. 



Palaeozoic burrows, tracks, and other 

 markings, 594 ; Entomostraca, range 

 of some, 2 ; Ostracoda from North 

 America, Wales, and Ireland, 534 ; 

 Radiolarian Chert from Scotland, 

 Proc. 1 1 2. 



Pebidian in Caerbwdy Valley, 244 ; 

 in St. Non's Bay, 244 ; relation of 

 the, to the Cambrian, 243, 253 ; 

 to the Dimetian, 263 ; succession, 

 the, 255. 



Pennsylvania, some glacial deposits in, 

 Proc, 114. 



Peridotite, microscopic sections of, 

 630-632 ; of the South Island, New 

 Zealand, 623, 626. 



Permanence of Ocean-basins, Dr. W. 

 T. Blanford on the, Proc. 59. 



Permian Breccias, Mr. W. S. Gresley 

 on the, Proc. 114. 



Peterborough, Crocodilian jaw from 

 the Oxford Clay of, 284; Plioaau- 

 riis ferox from, 49. 



Phoca Moori, 446. 



Phocanella minor, 4i^l. 



Phymatoderina, 602. 



Pidgeon, Mr. D., on certain Physical 

 Peculiarities exhibited by tlie so- 

 cfilled " Raised Beaches " of Hope's 

 Nose and the Thatcher Rocks, 

 Devon, 438. 



Pitchstones of the Western Isles, 371, 

 379. 



Plan of the Plain of Tortoura, Arme- 

 nia, 33 ; Teversall and Pleasley Col- 

 lieries, showing the Wash-out, 433. 



Planolites, 612. 



Plants, fossil, of the Westleton and 

 Mundesley beds, 115. 



Plateau-gravels of Berks and Surrey, 

 Dr. A Irving on the, 557. 



Localities of Sections of the, 560. 



Pleasley Colliery, Wash-out in, Proe. i, 

 432. 



Pieurocoelus valdensis, 182, 184. 



Pliosaurus ferox, 49, 50. 



Plumbago of Borrow dale, Mr. J. Pos- 

 tlethwaite on the, Proc. 124. 



Polycope sublentlcularis, 550. 



Polvzoa North-Italian, Proc. 123 ; of 

 the Red Chalk, Mr. G. R. Vine on 

 the, 454. 



Porphyry Crags of Treginnis, 257 ; in 

 Grit, section of, 412. 



Porth Clais, the Dimetian in the Allan 

 Valley at, 264. 



Porthlisky JBay, the red quartz-ande- 

 site of, 258 ; the Dimetian in, 263. 



Portland, Cimoliosmoriis from the 

 Purbeck beds of, 47. 



Oolite, structure of the grains of, 



279. 



Postlethwaite, Mr. J., on the Borrow- 

 dale Plumbago, its mode of occur- 

 rence and probable origin, Proc. 124. 



Potsdam Sandstone, concretions in the, 

 609 ; tracks and other markings in 

 the, 599, 609. 



Pre-Cambrian Rocks of the Long- 

 mynd, 386, 413, 



Preglacial Drifts and the Westleton 

 Shingle, 155; Hill-gravels, 162. 



Prestwich J., on the relation of the 

 Westleton Beds, or Pebbly Sands of 

 Suffolk, to those of Norfolk, and on 

 their extension inland, with some 

 Observations on the Period of the 

 Final Elevation and Denudation of 

 ThamesValley, Part. I., 84 ; Part II., 

 120 ; on the relation of the West- 

 leton Shingle to other Preglacial 

 Drifts in the Thames Basin, and on 

 a Southern Drift, with Observations 

 on the Final Elevation and Initial 

 Siibaei'ial Denudation of the Weald, 

 and on the Genesis of the Thames, 

 Part III., 155. 



Primitia Pill inqsii, 547 ; ClarJcei, 535 ; 

 humilis, var. hamilior, 3, 5 ; minuta, 

 3,7 ; Morgani, 3, 5 ; mundula, 551, 

 552, 553 ; mundula, var. cambrica, 

 3, 5 ; ovata ?, 552 ; seminidam, 3, 5 ; 

 sp., 553 ; Ulrichi, 3, 6, 551 ; unicornis, 

 3, 7 ; (?) Walcotli, 543 ; Whitfieldi, 

 3, 9. 



Primitiopsis jpunctulifera, 3, 9, 28, 

 542. 



