Vol. 54.] 



GEHfERAL INDEX. 



659 



Decean trap, origin explained, 13. 



Deep Hard Coal (seam), 164. 



Deep-sea conds., no indie, of, in Cor. 

 Crag, 343 et seqq. ; deep-sea de- 

 posits in Barbados, 540-555 w. 

 map, sects., & lists of foss. 



Denbighshire, Carb. Limest. succes- 

 sion in, 382. See also Olwyd, etc. 



Derbyshire, quartz-rock in Carb. 

 Limest. of, 169-183 & pis. xi-xii 

 (map & microsc. sects.). 



Deroceratan age, 447-448 & table i. 



Deroceratidae, list of genera, 459. 



Des Cloizeaux, a. L. O., obituary of, 

 lii. 



Devitrified obsidian of Herefordshire 

 Beacon area, 557, 559. 



Devon, Eoc. deposits of, 234-238 ; 

 submerged rock- valleys in, 262-268 

 figs., 270-278 ; see also Honiton, 

 Widwortby, etc. 



Diabases of Gatsrand Series, 91. 



Diatomacese in clay of Neyland Pill, 

 252 ; in Cardium-ssind & Scrohicti- 

 laria-claj fr. Heyst, 578, 579- 

 580. 



Biaulax, generic char, of, 19. 



Carterianay 19. 



Oweni, 20. 



• sp., 20. 



Dicellograptus moffatensis, 516. 

 Dicellograptus-skiffer of S weden,correl. 



in part w. EllergiU Beds, 528. 

 Bichogroptus, generic definition modi- 

 fied, 483. 



aranea, ref. to JD. octohraehiatus. 



phylo- 



483. 



— octohraehiatus, 483-484 ; 

 geny of, 538 & table iv. 



— Segdwickii ref. to D. octohraehia- 

 tus, 483. 



separatus, sp. nov., 484-485 fig. 



Dichotomous branching in graptohtes, 



477. 

 Dictyonema, descendants of, table iv 



(536). 

 Bictyoihyris coarctata used as a heme- 



ral designator, table i (facg. 450). 

 Bidymograptus affinis, 503-504 ; phy- 



logeny of, 535 & table iv. 

 arcuatus, phylogeny of, 538 & 



table iv. 

 hifidiis, 



511-512 ; phylogeny of, 

 533. 



caduceus, see gihherulus & Tetra- 



graptus Bigshyi. 

 — extensus, 504 



phylogeny of. 



538. 



— fasciculatus, 507 fig.-508. 

 furcillatus, phylogeny of, 



Bidymograptus gihherulus, 496-499 



figs. ; phylogeny of, 534. 

 gracilis, 506-507 ; phylogeny of, 



535. 

 indentiis, 510; var. nanus, 511 ; 



phylogeny of, 532. 



Nicholsoni, 502 fig.-503; 



logeny of, 535. 



— nitidus, 499-502 figs. 



— patulus, 504-506 figs. ; 

 logeny of, 538. 



V-fractus, 508-509 figs. 



phy. 



phy- 



533 & table iv. 



531, 



var. 

 volucer, 510. 



Diestien period, map showg. W. & S. 

 limits of German Ocean towards 

 commencem. & end of, 316 ; D. age 

 of Berks pebble-gravel, 599. 



Diestien Sands, fauna comp. w. those of 

 Lenham Beds & Cor. Crag, 317-320. 



Differential flow in glaciers, 203 et 

 seqq., 223. 



Biplograptus appendicidatus, 518 fig. 



dentatus, 517. 



cf. teretiusculus, 518. 



Dolerites, of Rotuma I., 10 ; of Cutch, 

 12 ; of Witwatersberg, 91 ; brec- 

 ciated, of Tinker's Hill, 561. 



DoLLO, L., elected For. Corr., i. 



Dolomite in Carb. Limest. nr. Llan- 

 dudno, 383 et seqq. w. chem. anal., 

 398-399 ; dolom.-format. in S. 

 Transvaal, 86-89 w. chem. anal. 



Dolomitization of limest. in S. Wales, 

 etc., 182-183. 



Domes, laccolitic, of Cutch, 12. 



Donald, Miss J., award fr. Murcbison 

 Fund to, xliii ; on AcUsina & other 

 Carb. Gasteropoda, 45-72 &pls. iii-v. 



Dorsal cup in Petalocrinus, 408 ; 

 table of measure m., 430. 



Borycordaites 0) fr. Tereeniging, 93. 



Doveholcs (Derby), limest. w. quartz- 

 cry st., 178. 



Draper, D., presents map of Klerks- 

 doi'p, Potchefstroom, & Krugers- 

 dorp districts, viii. 



Drift, pre-Glacial, etc., in Ty Newydd 

 Caves, 122 et seqq. ; Glacial, in 

 Lambay I., 136, 139 ; ' volcanic,' nr. 

 Mansfield, 167 ; at Little Orme's 

 Head, 396; high-level marine, at 

 Colwyn Bay, 582-584 ; see also 

 Boulder Clay. 



Dromiacea, 18. 



Bromilites BucMandi, 18. 



Lamarckii, 19. 



Drummond, H., obituary of, Ivii. 



Duckmanton Tunnel (Derby), descr. 

 sect. betw. Arkwright's Town Sta- 

 tion and, 163 ; Coal Measures in, 

 1(54 ; sect, at W. end of, 165. 



