10 



&Ex\EEAL INDEX. 



[Nov. 1906, 



Dentalium liassicum, 581-82 & pi. xlv. 



limatulum, 582 fig. 



: minimum, 582-84 & pi. xlv. 



oblong um, sp. no v., 585 & pi. xlv. 



parvulum, sp. nov., 585-87 & 



pi. xlv. 



subovatum, sp. nov., 587-88 & 



pi. xlv. 



subquadratum, sp. nov., 588-89 



& pi. xlv. 



subtrigonale, sp. nov., 589 & 



pi. xlv. 



■ Terquemi, sp. nov., 589-90. 



trigonale, 590-94 & pi. xlv. 



Denudation, Devonian, of Lake-Dis- 

 trict rocks, lxxxi-lxxxii ; enormous 

 extent of denudat. in Inner Hebri- 

 des, 65-66, 68 ; denudat. of Coal- 

 Measures in Cannock-Chase area, 

 523 et seqq. w. map ; denud. within 

 do. on Northumbrian coast, 546. 



Depression of outskirts of Lake Dis- 

 trict, cxxiii. 



Derwentwater, sect. fr. head of, along 

 Seathwaite branch of Borrowdale, 

 facing cxviii. 



Devonian tectonic phenomena in Lake 

 District, lxxx et seqq. ; Dev. sandst., 

 glaciated, on Carden Moor, 27-28 ; 

 Dev. of Bolivia, trilobites from, 

 426 et seqq., 432 ; see echo Old Eed 

 Sandstone. 



Dewalque, Gr. J. Gr., obituary of, lv- 



lvi. 

 Diabases of Llangynog district, 235- 

 36, 237, 244-45, 246 & pi. xxvi 

 (microscope-sect.), 248; in S.W. 

 Caerinarthenshire, 601, 643. 

 Dibley, Gr. E., exhibits Ptyckodus- 

 teeth, iii, exxxiii ; exhibits dental 

 bone of Coniosaurus crassidens, 

 exxix ; exhibits quartz-erratic fr. 

 Chalk, exxxiii. 

 Dibunopky Hum-Zone at Rush, 279, 

 290-94 figs.; faunal lists from, 

 297-99 ; correlation, 302-304 ; D.- 

 Zone in Mendip area, 325, 335-36 ; 

 list of exposures, 351-53 ; correlat. 

 w. D.-Z. in Bristol area, 357-58; 

 D.-Z. of Ebbor Rocks, 363-64. 

 Dicranograptus-Beds of W. Caermar- 

 thenshire, 626-33 w. lists of foss. 



Clingani, confused w.B. rectus (?) , 



643. 

 Dictyograptus-Beds of W. Caermar- 

 thenshire, 607-608. 

 Didymograptus affinis (1), 431. 



bifidus fr. Bolivia, 431, 432 ; D.- 



bifidus Beds of Llangynog district, 

 229-30; do. of W. Caermarthen- 

 shire, 613-19 w. lists of foss. 



Didymograptus extensus, zone of, in 



W. Caermarthenshire, 604." 

 Murchisoni Beds of W. Caer- 

 marthenshire, 619-24 w. lists of 

 loss. 

 cf. Nicholsoni, fr. Bolivia, 431. 



Differential weathering determining 

 lakes, 185-87, 188, 190. 



Differentiation, magmatic, originating 

 Buttermere & Ennerdale grano- 

 phyre & modificats. thereof, 268; 

 insufficient to account for origin 

 of Dunedin (JST.Z.) rocks, 417, 419. 



Dimensional variation (in corals), a 

 function of environment, 313. 



Dimorphograptus Swanstoni, zone of, 

 in Tarannon area, 686-87. 



Diorite (?) of Esperanza Cataract, 

 96-97 ; augitic, of Dunedin (N.Z.), 

 394, 



Diplograptus sp., fr. Bolivia, 431. 



Diphyoids, table of strata in wh. they 

 occur, 439 ; stratigraph. sequence 

 of, 440; development of, 437 et 

 seqq. & pi. xli ; lobation of, sug- 

 gested explanation, 455. 



Dislocations, pre-Glacial, in Chalk of 

 Moen, 484 et seqq. 



Dolerites of Eigg, 41, 42, 45 et seqq. ; 

 of Esperanza Cataract, 96-97; of 

 Buttermere & Ennerdale district, 

 263, 265-66, 267-68 ; of Dunedin 

 district (N.Z.), 410-11 w. chem. 

 anals. 



Dolfach (Montgomery), 669. 



Dolgadfan(Montgomery), Llandovery, 

 &c. rocks near, 681-85 w. map 

 (p. 680) ; sect, to Talerddig across 

 Newydd Eynyddog, pi. xlviii. 



Dolgadfan Group, 682-83, 684 et seqq. 



Dol^au Mudstones of Tarannon R., 

 655-57, 666-69, 673-74, 676, 695. 



Dolgoch (Montgomery), 665, 666. 



Dollo, L., elected For. Memb., v. 



Dolomite, originating in part fr. cal- 

 careous algai, 711 ; outcrops of, 

 & Ticino lakes, 168 et seqq. 



Dolwilym (Caermarthen), 643. 



Dome, formation of, in Lake District, 

 Ixviii et seqq., lxxx-xcv figs. 



Donald, Miss Jane, see Longstaff, 

 Mrs. Gr. B. 



Doncaster (Yorks), earthquake of 

 April 23rd, 1905, 5-12 & pi. ii 

 (map). 



Donors to Library, &c, lists of, xiv- 

 xix. 



Downton Bone-Bed, 209, 210. 



Downton Castle (Shropshire), sects, 

 fig. & descr., 207-10 ; D. C. inlier, 

 sects, fig. & descr., 210-14. 



