Ort 



284 



OrtJioceras mendax, sp. nov., xv. 374 & 



pi. xiii. 



■ nummularium, xxxiv. 608. 



■ politum, vii. 151, 172 & pi. x. 



pusgillense, sp. nov., xlvii. 527 figs. 



- rachidium, sp. nov., xix. 16. 



> sericeum in Lr. Cambr., xxxvii. Proc. 



67 ; in Upper Tremadoc of Garth, 



xxxvii. Proc. 95 ; in Arenig Group, 



xxxvii. Proc. 114. 



striatum, xii. 381 & pi. vi. 



trigonale, xii. 381 & pi. vi. 



undulostriattim, xv. 375 & pi. xiii. 



vagans, v. 153 & pi. vi. 



• vaginatum, vii. 177 & pi. x. 



• vertebrate, xv. 375 & pi. xiii. 



■ vesiculosum, sp. nov., xix. 15. 



. spp., *(Silur.), fr. Bohemia, x. (Part 2) 



23 figs. ; (China), xii. 378-381 & pi. vi. ; 



(Tremadoc), xxix. 51 & pi. iii. ; (Wardie 



Shales), xxxiv. 21 & pi. ii.; (Stauro- 



cephahis-zone), xlvii. 526. 

 Orthocera s-Limestone (Arenig Group) in 



Sweden, i. 477, 479, iii. 4 et seqq., xxxviii. 



314, 319; in Eussia, i. 482, xxxviii. 



519. 

 Orthoceras-Sl&tes in Nassau, xiii. p. 



lxxxviii. 

 Orthoceratites, *struct. of, ii. (Part 2) 95 ; 



orth. *of Bohemia classified, xxiv. 



(Part 2) 14. 

 Orthoceratite-Flagstones in Ayr, vii. 149. 

 Orthoceratite-Limestone, see Orthoceras- 



Limestone. 

 Orthoclase in Irish granites, chem. anal. 



of, xii. 173, 189, 200 ; in Donegal granite, 



xviii. 410 w. chem. anal.; in pluton. 



rocks of Garahal district, xlviii. 110 ; f r. 



Arendal, cross-hatching in, xxxi. 479 & 



pi. xxiii.; do., in oligoclase fr. Tvede- 



strand, xxxi. 481 & pi. xxiii.; optical 



char, of, xxxi. 484 ; in Missouri granite, 



microsc. struct, of, xlv. 183 figs. ; crystal 



showg. secondary extens. of felspathic 



material, xlvii. 174 fig. See also Felspars. 

 Ortholophus, gen. nov., xliii. 414. 



lineatus, xliii. 413, 415. 



Ortlwmerus JDolloi, gen. & sp. nov., xxxix. 



248, 249, 252 figs. 

 Orthonema pygmceum, sp. nov., xlv. 620 & 



pi. xx. 

 . (?) Youngianum, sp. nov., xlv. 620 & 



pi. xx. 

 Ortlionota grammysioides, sp. nov., xx. 300 



& pi. xvi. 

 . navicula, sp. nov., xxxv. 496 & 



pi. xxiv. 



i sp. (Budleigh Salterton), xxx. 48 & 



pi. vi. 

 Orthopsis indicus, sp. nov., xliii. 153, 



154. 

 Orthopterous insect fr. Coal Measures of 



Scotland, xxxii. 60-65 & pi. ix. 

 Orthojpus primcevus, xxxii. 353 fig. 

 Orthotrix Goldfussi, see Stroplialosia. 

 Orton (Northants), trial-boring for coal 

 at, xl. 491; 'Orton gravel,' x. 344; 

 O. Hall, section nr., x. 345. 



Ortonia conica, var. pseudopunctata nov. r 



• xxxviii. 383 & pi. xv. 



serpuliformis, sp. nov., xxxviii. 384 



& pi. xv. 



Oetjeta, M. de, Geol. of Neighb. of Ma- 

 laga, xxvii. 109-113 & pi. v (ammo- 

 nites), xxviii. 148, 492-494. 



Orwell Valley (Suffolk), section to tribu- 

 tary of R. Deben, xxxiii. 104. 



Osborne & St. Helen's group rejected as a 

 sep. div., xxxvi. 169. 



Osborne Beds of Headon Hill, etc., xxxvii. 

 89 et seqq. ; of Cliff End, xxxvii. 104 ; 

 in I. of W., Clupea vectensis fr., xlv. 

 112-117 & pi. iv. 



Oscarskal Group (Caradoc), xiv. 37, 39. 



Oschatz (Saxony), section, v. 3. 



Oscillation of rivers, xix. 322. 



Oscular surface in PMretrospongia, xxxiii. 

 244 & pi. xi. 



Oslo Group (Llandeilo & Stiper Stones), 

 xiv. 37, 39. 



Osmington (Dorset) Oolite, at & nr. Wey- 

 mouth, iv. 252, xxxiii. 265; list of foss., 

 xxxiii. 266 ; gen. section, xxxiii. pi. xii.; 

 equivs. in Normandy, xxxvii. 549, 550. 



Ostminda regalis, xxvi. 349 & pis. xxiv.- 



XXV. 



Osmundites DowJceri, sp. nov., xxvi. 349- 



353 & pis. xxiv.-xxv. 

 Osmundsberg (Sweden), iii. 10 & pi. i 



(section). 

 Osnabruck ("Westphalia), *Tert. clays at, 



viii. (Part 2) 40. 

 Ossiferous sand (Tert. ?) in Mayence Basin, 



x. 272 ; list of f oss. fr. same, x. 285 ; 



fissures in Devon, Cornwall, & S. Wales, 



in conn. w. rubble-drift, xlviii. 319 et 



seqq. ; sugg. orig. of same, xlviii. 335 ; 



fiss. nr. Ightham, 1. 171-187 figs. ; plants 



& invertebr. in same, 1. 181; vertebr. 



fauna fr. same, 1. 188-210 & pis. x.-xii. 



See also Bone-caves. 

 Ostana (Po Valley), 1. 276. 

 Osteolepis arenatus, xvi. 124. 



brevis, xvi. 124. 



Osteoracliis macrocephalus, gen. & sp, 



nov., xxiv. 500. 

 Osterwald (Hanover), list of Neocom. foss. 



fr., xxvi. 339, 340. 

 Ostracacanthus dilatatus, gen. & sp. nov., 



xxxvi. 64 fig. 

 Ostracion cornutus, comp. w. Ostraca~ 



cantlms, xxxvi. 65, 66. 

 Ostracoda in Upper Boulder Clay nr. 



Chester, xxx. 182; in Calcif. Sandst. 



Series, xxxiv. 4 ; in glac. deposits of W. 



Cheshire & Lanes, list of, xxxiv. 392 ; 



in Arenig Group, xxxvii. Proc. 113 ; in 



Caradoc & Bala Group, xxxvii. Proc. 



136; fr. Boulder Clay at Bridlington, 



xl. 323; fr. Richmond boring, xl.765- 



777 & pi. xxxiv.; of Purbeck format., 



w. notes on Wealden spp., xii. 311-353 & 



pis. viii.-ix. ; Carb.. of Brit. Is., xiii. 



496-514 w. tables & lists ; fr. so-called 



' soapstone ' of Fiji, xliv. 7 ; Pateoz. 



fr. N. America, Wales, & Ireland, xlvi. 



