646 



GEjS t EEAL index. 



Pebidian of St. David's, 283. 

 Pecten aratus, 497. 



comutus, 498. 



demissus, 498. 



fenestralis, 499. 



gingensis, 498. 



intermittens, 499. 



lasviradiatus, 500. 



puellaris, 500. 



spinicostatus, 500. 



triformis, 500. 



Pegwell Bay, section at, 204. 

 Pemnaeninawr, drifts of, 112. 

 Peronella Metabronnii, 548. 



repens, 548. 



Peyton, John E. H., Esq., on a Weal- 

 den Fern, Oleandridium (Tcenio- 



pteris) Beyrichii, Schenk, new to 



Britain, Proc. 3. 

 Pholadomya bellula, 534. 



■ callcea, 532. 



fortis, 533. 



Newtonii, 533. 



spatiosa, 534. 



Picrite, hornblende, Prof. Bonney on 



boulders of, near the western coast 



of Anglesey, 254. 



■ , analyses of, 256, 257. 



Pinna claviformis, 518. 



dundriensis, 518. 



Pipa dorsigera, shoulder-girdle of, 



Proc. 49. 

 Placopsilina cenomana, 27. 

 Placuna Rupertina, 496. 



■ sagittalis, 497. 



Plan of the disposition of the rocks in 



the Allan valley at Porth-clais, 



277 ; of junction of granite with 



Cambrian strata, Ogof-llesugn, 278 ; 



of Atlantic Docks, Liverpool, 86. 

 Plastron, development of, in a young 



tortoise, 137. 

 Platychonia elegans, b^J. 

 Plectospyris elegans, 545. 



major, 546. 



Plesiosaurus, sterno-coraco -scapular 



mass of, 134; shoulder-girdle of, 



Proc. 46. 

 diduchus, shoulder-girdle of, Proc. 



58. 

 dolichodeirus, shoulder-girdle of, 



Proc. 59. 



■ Manseli, hind limb of, Proc. 52. 



Plicatula Sollasii, 515. 



subserrata, 515. 



Pliosaurus, sterno-coraco-scapular mass 



of, 135 ; shoulder-girdle of, Proc. 



60. 

 portlandicus, hind limb of, Proc. 



54- 

 Polurrian Cove, section in, 10. 



Polypora, 31. 



Porella marsupium, 437. 



Porphyries, quartz-, of the Troad, 

 631. 



Porphyrites, augite-, of the Troad, 

 631. 



Porphyry, quartz-, of St. David's, 

 313. 



Porth-clais, junction of granite with 

 Cambrian strata, 275, 276; section 

 from near Castell to, 268 ; plan of 

 the disposition of the rocks in the 

 Allan valley at, 277. 



Porth-seli, section from, to cliffs near 

 Nun's Chapel, 268. 



Portland Oolite, Mr. B. F. Tomes on 

 Madreporaria from the, of the coun- 

 ties of Wilts, Oxford, Cambridge, 

 and York, 555. 



Poulan-drein, section between Calda 

 Burn and, 369; section on, 369, 

 370. 



Poynton, drifts of, 95. 



Pre-Cambrian rocks of St. David's, 

 Mr. A. G-eikie on the supposed, 

 261. 



Preston, drift-deposits at, 105. 



Psammospkcsra fusca, 26. 



Ptilopora, 31, 37. 



Quartz-conglomerate, Lower Cam- 

 brian, of St. David's, 305. 



Quartz-diorites of the Troad, 631. 



Quartz-felsite, Prof. T. G-. Bonney on 

 the rocks between the, and the Cam- 

 brian series, in the neighbourhood 

 of Bangor, 478. 



Quartz-porphyries of the Troad, 631. 



Quartz-porphyry of St. David's, 313. 



Quartzite of Assynt series, igneous 

 rock of the, 409. 



, seamy, 361 ; annelidian, 361. 



, Upper, non-existent in Assynt, 



367. 



Quidong, Manaro, Australia, geologi- 

 cal sketch of, Proc. 76. 



Beade, T. M., Esq., on the Drift-beds 

 of the North-west of England and 

 North Wales. — Part II. Their 

 nature, stratigraphy, and distribu- 

 tion, 83. 



Reculvers, Mr. J. S. Gardner on the 

 Lower-Eocene section between, and 

 Heme Bay, 197. 



, section from east of Heme Bay 



to near, 201. 



Eeophax helvetica, 27. 



multilocularis, 26. 



scorpiurus, 27. 



Betepora Beaniana, 439. 



