Fel 



142 



Archaean age, fr. flanks of Herefordshire 

 Beacon, xliv. 740-744 & pi. xvii. ; fels. 

 in Leicester breccias, xlv. 26 ; of Long- 

 mynd Series, xlvii. 110; non-schorlaceous, 

 in Triass. breccias of S. Devon, xlvi. 73 ; 

 schorlaceous do., ibid., xlvi. 75 ; ' South- 

 ern,' in N.W. Caernarvon, xlvii. 332, 

 1. 579 et seqq. ; & assoc. melaphyres of 

 Caradoc, xlvii. 534-544 & pi. xix. ; no- 

 dular, of Lough Guitane, xlviii. Proc. 76, 

 98, 99 ; fels. betw. Bethesda & Llanllyfni, 

 xlix. 441 ; distrib. of, in Cambr. Series, 

 xlix. 464; of Sourton Tors, 1. 343. 



Felsitic dj'kes of St. David's, xlvi. 260 w. 

 chem. anal. ; do. in gabbro of Druim an 

 Eidhne, 1. 226; matter, microcryst. & 

 cryptocryst., xxxv. 334 et seqq. ; tuffs 

 of St. David's, chem. anal., xxxix. 297 ; 

 rocks ibid., char, of, xl. 303. 



Felsitic Series (pre-Cambr.) of Caernarvon, 

 xxxv. 686. 



Felso-spherulites in quartz-porphyries of 

 St. David's, xxxix. 315. 



Felspars, glass-cavs. in, xiv. 476, 482 & 

 pis. xviii.-xix.; import, in classif. of rocks, 

 xv. p. xxxv. 



Felspars, *Tschermak's researches on, xxi. 

 (Part 2) 18-20 ; var. in Malvern syenite, 

 xxi. 85 w. chem. anal. ; in Brit. Carb. 

 dolerites, xxx. 533 & pi. xxxiii. 



Felspars, peculiarities in microsc. struct, 

 of, xxxi. 479-488 & pis. xxiii.-xxiv. ; 

 altered, spherul. struct, of. xxxiv. 484 & 

 pi. xxi. ; pseudomorphs after, xxxvi. 

 Proc. 51; ragged crystals in Yellowst. 

 obsidian, xxxvii. 392 fig. ; crystals pene- 

 tratg. inclus. in granite, xxxviii. 216, 

 217 figs. ; large do. in Cocktield & Arma- 

 thwaite dyke, xl. 216; small do. ibid., 

 xl. 218 ; in Hett dyke, xl. 229 ; in High 

 Green dykes, xl. 241 ; in Acklington 

 dyke, xl. 243 ; in Gr. Whin Sill, xl. 

 645 w. chem. anal. 



Felspars in gabbro of Hebrides, xli. 362; 

 changes undergone by same at gr. depths, 

 xli. 375 ; in andesites of Breidden Hills, 

 xli. 540, 541 figs. ; in Beinn More gabbro, 

 chem. anal.of,xlii. 64; in basalt, corroded 

 & bent, xliii. 498 & pi. xxi. ; contact- 

 metamorph. unfavour. to format, of, xliv. 

 18 ; in Mullaghderg granite, cleavages 

 of, xliv. 550 fig. ; porphyritic, growth 

 after consolid. & weatherg. of an igneous 

 rock, xlv. 178 ; changes in comp. of outer 

 zones durg. growth, xlv. 179 ; modif. by 

 microgr. struct., xlv. 252. 253 figs. ; 

 zoned, in aug.-andesites, xlvi. 376; of 

 Shap granite, descr., xlvii. 278, 282 w. 

 chem. anal. ; in N.E. Forfar rocks, xlix. 

 336, 343; secondary, format, of, xlix. 

 366; in Derby lavas', 1. 622. 



' Felspar-porphyries ' in Tweed Valley, iv. 

 196 et seqq. ; in Cawsand Bay, x. 361 ; 

 of Carrick, xxii. 520. 



Felspar-porphyrites in Essex drift, xliii. 

 354. 



Felspathic rocks, metamorphic, of Carrick, 

 xxii. 516; -quartz-veins in Malvern Hills, 



chem. anal, of, xxiii. 362 ; trisilicated 

 felsp. veins ibid., xxiii. 362 ; -hornbl.- 

 rocks ibid., chem. anal, of, xxiii. 363; 

 ashes betw. Ulleswater & Keswick, xxv'. 

 599 et seqq. ; boulders of Wales, posit, 

 relat. to drift-deposits, xxx. 712 ; grits 

 or quartzites in Leicester breccias, xlv. 

 25 ; 'traps ' of Devon, xlviii. 496-507. 



Felstones, finely cryst., of Carrick, xxii. 

 525 ; bedded, of Herefordshire Beacon & 

 N. of same, chem. anal., xxiii. 358, 361 ; 

 (?) in N. Devon, xxiii. 603 ; in Caratal 

 goldfield, xxv. 336, 345 ; in Lake 

 District, xxv. 436 et seqq. ; veins of, in 

 Eigg, xxvii. 299 ; Tertiary, in Hebrides, 

 etc., w. chem. anal., xxx. 236, 263. 



Felstones of Aran & Arenig, xxxi. 399 ; 

 S.E. dispers. of boulders fr. same, xxxv. 

 444; of Snowdon, xxxi. 401; of Cumber- 

 land, xxxi. 409; dispers. of boulders fr. 

 same, xxxv. 439 ; feist. -like ashes, etc., 

 in Lake District, xxxi. 593 et seqq. & 

 pi. xxxi. ; dykes of Mt. Sorrel, etc., 

 „ xxxiv. 221; (listing, fr. felspathic grits, 

 etc., xxxv. 338 ; of Y Glyder Fawr, perlit. 

 & spherulit. struct., xxxv. 508-510 fig. ; 

 of Wrekin chain, xxxv. 646 et seqq. ; 

 assoc. w. O. R. S. in N. Ireland, xxxvi. 

 529, 530; of Pont-y-Gromlech, xxxvii. 

 405 et seqq. w. microsc. section. 



Felstones, nr. Newport-Fife, xlii. 420 ; in 

 Seringapatam district, xliv. 647, 648, 

 652 ; spec, use of term, xlv. 197 ; 

 nodular, of Lleyn, xlv. 247-269 figs. ; 

 feist, of Western Is. re-named propylites, 

 xlvi. 341, 342 ; (?) Arenig, in Moelwyn 

 district, xlvii. 375. 



Felstone-porphyry betw. Ennerdale & But 

 termere, xxv. 437; of Carrock Fell, xxv. 

 438 ; age of same, xxv. 439 ; of Scur of 

 Eigg, xxvii. 304. 



Feltwell St. Nicholas (Suffolk), section 

 descr., xliii. 555. 



Fenella sp. (Tertiary), xxxv. 87. 



Fenestella, gen. char, of, xxxvii. 179, xxxix. 

 31 ; groups successively sep. from, xxxix. 

 31. 



antiqua, xxxvi. 244. 



(?) arctica, xxxiv. 618, xxxv. 279, 



283. 



crassa, xxxv. 280, xxxvii. 186. 



dudleyensis, sp. nov., xxxvi. 248. 



fossula, xxviii. 332 & pi. xxv. 



halkinensis, sp. nov., xxxvii. 187, 



189. 



intermedia, sp. nov., xxxvi. 250 & 



pi. xi. 



lineata, sp. nov., xxxvi. 249 &pl. xi. 



■ megastoma, sp. nov., xix. 5 & pi. ii. 



membranacea, xxx. 685 & pis. xli.— 



xlii. ; xxxv. 281, xxxvii. 181, 189. 



Milleri, xxxvi. 246. 



multiporata, xxx. 684 & pi. xliii. 



nodulosa, xxx. 686 & pi. xliii. ; xxxv. 



280; xxxvii. 183, 189. 



patula, xxxvi. 247. 



plebeia (?), xxx. pi. xli.; xxxv. 278 



xxxvii. 179, 189; xxxix. 595. 



