Aga 



Agaricia agaricites, xix. 437. 



undata, xix. 437. 



Agassiz, L. J. R., obituary of, xxx. 

 p. xxxvii. 



Agate, in calcareous grit of Yorks coast, 

 vii. 1 et seqq. ; *struct. of, ix. (Part 2) 

 23; pebbles of, eroded, fr. Sudan, xliv. 

 368-370 ; nodules of, in Lleyn felsites, 

 tbeir orig., xlv. 257 ; examples of same, 

 xlv. 259. 



Agate-melaphyres in Queensland, xxviii. 

 315, 316. 



Agate-quarries of Oberstein, iv. 209-216. 



Age, geological, its importance in classif. 

 of igneous rocks denied, xli. Broc. 74 et 

 seqq. 



Agelacrinites TcasTcasTciensis comp. w. Le- 

 pidodiscus Bebouri, xxxv. 749. 



Agelacrinitidse, stratigr. distrib. etc., of, 

 xxxv. 750. 



Agglomerates, volcanic, in Bradgate Park, 

 xxxiii. 764 ; of Benscliff, xxxiii. 765 ; of 

 Markfteld, etc., xxxiii. 770 et seqq. ; 

 in Charnwood Forest generally, xxxiv. 

 202, 203; microsc. struct, of fragm. 

 in same, xxxvi. 347, xlvii. 95 ; slaty, 

 in Central Cornwall, xxxiv. 476 ; Ter- 

 tiary, in Hebrides, xxx. 239 ; the same, 

 incl. Secondary rocks, xxxiv. 666, 667 ; 

 of Portbdinllevn , xxxvii. 49 ; of Clegyr 

 Hill, xxxix. 285, xl. 523. 



Agglomerates, Arenig. in Moelwyn dis- 

 trict, xlvii. 375 ; nr. Scarlet Point, xlvii. 

 436, 437 ; in Lr. O. R. S. of Brit. Is., 

 xlviii. Proc. 78. 



Aggregation, result of contact-action, xlv. 

 496. 



Agnana (Italy), coal at, xii. p. xciii. 



Agnostus Barrandei, xxviii. 176 & pi. v. 



cambriensis, sp. nov., xxvii. 400 & 



pi. xvi. 



Davidis, xxviii. 174 & pi. v. 



dux, sp. nov., xxxiii. 665 & pi. xxiv. 



JEskriggei, sp. nov., xxviii. 175 & 



pi. v. 



Jiirundo, xxxi. 176 & pi. x. 



Morel, xxii. 487 figs. 



princeps, xx. 237 & pi. xiii. 



scarabceoides, xxviii. 175 & pi. v. 



scutalis, xxviii. 175 & pi. v. 



Agrilium Cyllabacus, sp. nov., x. pi. xvi. 



Cyllarus, sp. nov., x. pi. xvi. 



■ Stomphax, sp. nov., x. pi. xvi. 



Strombus, sp. nov., x. pi. xvi. 



Agrionidium Aetna, sp. nov., x. pi. xviii. 



Agrosaurus Ilacgillivrayi, gen. & sp. nov., 

 xlvii. 164-165 figs. 



Aguacate Mts. (Costa Rica), gold & silver- 

 mines, etc. in, xxxviii. 330 et seqq. ; 

 dir. of lodes in same, xxxviii. 331 fig. ; 

 junct. of augite-andesite & 'country 

 rock ' nr. San Rafael tunnel, xxxviii. 

 332 fig. 



Ahrien system (~ Devon. P), ix. 24. 



Ai kin, A., obituary of, xi. p. xli. 



Ailsh, Locb (Sutherland), section descr., 

 xvii. 99 fig. ; ' Lr. Silur.' success, of, xvii. 



198 ; promontory, section in, xxxix. 

 153 ; limest. of, sep. fr. dolomite 

 of Assynt Series, xxxix. 386 et seqq. ; 

 igneous rocks of, xxxix. 409, 420. 

 Ailurus, range of, in space & time, xliv. 

 230. 



anglicus, sp. nov., xliv. 228-231 & 



pi. x. ; xlvi. 451 & pi. xviii. 



fulgens, comp. w. Ail. anglicus, 



xliv. 228, 229 & pi. x. ; xlvi. 452 & 

 pi. xviii. 



Ain Mousa (Arabia Petraea), desert at,xxv. 



18 ; rocks betw. Wadi Amara and, xxv. 



20; section showg. superf. deposits, 



xxv. pi. i. 

 Air-bubbles, dir. of, in vole, dvkes, xxxii. 



484, 486. 

 Airdrie (Dumbarton), Tellina-bed below 



Till nr., vi. 386; Tellina calcarea- 



bed at Cbappel Hall, xxi. 219-221; 



blackband ironst., xix. 56 ; Anthraco- 



saurus fr. same, xix. 56. 

 Aire River (Yorks), gravels along valley, 



xxv. 61 et seqq. ; maps of, xxv. 61, 62 ; 



sections nr. Bingle}', xxv. pi. iv. ; drift 



in basin of, xxviii. 383 et seqq. 

 Aitken, J., Unequal Distrib. of Drift 



on Opp. Sides of Pennine Chain, etc., 



xxxii. 184-190. 

 Aitkin, Mt. (Victoria), basalt, etc. of, 



xiv. 227. 

 Aix-la - Chapelle (Germany), *geol. of 



district, vii. (Part 2) 109-111; *Cret. 



sands of, x. (Part 2) 19 ; *Cret. thallo- 



phytes of, xiii. (Part 2) 36. 

 Akabah (N.W. Arabia), granites, etc. of, 



xxxi. 13 ; rocks betw. Tib. plateau and, 



xxxi. 24 ; Gulf of, section to Jordan 



Valley, facg. xxxi. 12. 

 ' Akerites,' 1. 32. 

 Alabama, coalfields of, ii. 278-282; Eoc. 



of, ii. 407-409; so-called Nummul. 



Limest. of, iv. 10-16. 

 Alabaster in Tuscany, i. 280 et seqq., xvi. 



484 ; fr. Egypt, iv. 332 ; nr. Madian, 



xxxi. 7. 

 Alabaster series in Arabia Petraea, xxv. 



21. 

 Alajuela (Costa Rica), San Jose, & Car- 



tago, section showg. ancient lakes, 



xxxviii. 333. 

 Alameda Sands at Gibraltar, xxxiv. 526. 

 Alaria Beaugrandi, xxxvi. 229. 



coronata, sp. nov., xxiii. 152 & 



pi. vii. 



fusiformis, sp. nov., xxiii. 542 & 



pi. xiv. 



rudis, sp. nov., xxiii. 542 & pi. xiv. 



Alaska, Coal Measures on coast & is. 



of, xi. 519; mammoth-remains in, 1. 



1-9. 

 Alauda arvensis, 1. 191 & pi. x. 

 Albania, *geol. of, xx. (Part 2) 22. 

 Albania (Griqualand West), Ilesosaurus 



tenuidens fr., xlviii. 591. 

 Albano (Italy), microsc. struct, of leucite- 



basalt of, xxxi. 398. 



