ccl 



INFERIOR OOLITE AMMONITES. 



Sessile, 4.05 



Sevenhampton, lxvi 



Seven Sisters, strata of, ccvii 



Sharpe, S., 48, 52 ; on Northampton Oolite, 47 ; 

 ou Am. Murchisonse, 53 



Shepton Beauchamp, xiv, xix, xx, xxi, xxiv, xxv, 

 xxvi, xxvii, cli 



Shepton Mallet, cxlvi 



Sherborne, 19, 28, 31, 32, 40, 61, 65, 90, 97, 106, 

 108, 120, 121, 275, 292, 305, 307, 309, 1, liv, 

 lviii, lix, lxi, lxxi, lxxvii, lxxi, lxxii, lxxiii, 

 lxxxv, lxxxvi, lxxxvii, lxxxviii, xciv, xcvii, cxc ; 

 Ammonites of disused quarry at, 292 ; exca- 

 vations at, and Mr. Hudleston, 374; strata 

 of, ccvi, ccvii 



Shire, note on, 359 



Sickle-shaped ribs, 294 



sigaloen, Lytoceras, cc 



Sigmoidal ribbing, 124 



Signalberg, 258 



signata, Dumortieria, PI. 42, figs. 6, 7, p. 248 

 (Dum. radians); Suppl., fig, 176, p. cxcvi ; p. 

 clxxix 



similis, Brasilia, PI. 15, figs. 1, 2; PI. A, fig. 13 ; 

 p. 31 (Lioceras decipiens var. simile) ; Suppl., 

 PI. 11, fig. 36 ; p. lxxxii 



Simoceras, 269 ; Dumortieri, scissum 



simplex, Sonninia, PI. 70, figs. 2, 3 ; PI. 103, fig. 

 11 ; pp. 326, 390, 423 



simplex, Sonnivia, PI. 70, Jig. 1, see sp., Sonninia 



simplex, Sonninia, 353, 439 



simplex, Terebratula, found outside Cotteswolds, 8 



simplification, stages of, cxcix 



Simpson, 85, 203 



Simpsoni, Ammonites, 226 



Sinon, Harpoceras, 227 



Sinon, Hudlestonia, PI. 38, figs. 18-16; p. 227 



Siuon, Ludwigia, 227 



Sinon, Pelecoceras, 175 



Siphonal lobe, augmentation of branches of, how 

 caused, 217 



Size, acme of, cc 



Skeleton lobes, table (VIII) of, 443 



Skye, Isle of, lxx 



Slate, 48 



Smith, J. P., cxcix 



Smith, W., 242 



Smooth evolute stage, examples of, 289 



Smooth Sonninia?, 448 



Snowshill Clay, date of, ccvii 



Snuff-Boxes, ccvii 



Sodbury, 163, 173, 209, 251, 252, clxxi; strata of, 

 ccviii ; see Little Sodbury 



Solaris, Ammonites, 241, clxxiv 



Solaris, Dumortieria, clxxiv 



Solid carina, 81, iv ; see carina 



Sollics-Pont, 294 



Somerset, 7, 9, 10, 19, 40, 50, 51, 55, 71, 73, 75, 

 90, 97, 103, 114, 117, 120, 124, 168, 173, 175, 

 208, 214, 220, 251, 257, 266, 275, 281, 305, 

 xiv, xv, xix-xxii, xxiv-xxvii, xlviii, liii, lvii, 

 lx, lxvii, lxxiv, lxxvii, lxxxvi, xcvi, xcvii, cix, 

 cxviii, cxxv, cxxviii, cxliv, cxlviii, cli, clxxii, 

 clxxiv, clxxv, clxxix, clxxxv, cxc, cxciii, cxciv ; 

 not to add shire, 359 ; strata of, ccvi, ccvii, 

 ccviii, ccix 



Sommerseatas, 359 



Sonninia, p. 313 ; Suppl., p. cxciii ; abnormis, 

 acanthodes, alternata, arenata, attrita, 

 boweri, brevispinata, biplicata, buckmanni, 

 camura, contusa, costata, costigera, crassa, 

 crassibullata, crassicostata, crassiformis, 

 crassinuda, crassispinata, cymatera, decora, 

 decorata, densicostata, diversa, dominans, 

 dominata, dominatrix, dominica, dundriensis, 

 duplicata, euromphalica, fissilobata, gibbera, 

 inaequa, insignoides, irregularis, laevigata, 

 loculosa, locuples, magnispinata, marginata, 

 modesta, multicostata, multispinata, mutans, 

 nodata, nuda, omphalica, obtusiformis, ovalis, 

 palmata, papilionacea, parvicostata, paucino- 

 data, plicata, polyacanthus, ptycta, pustu- 

 lit'era, quadrifida, reclinans, reformata, regu- 

 laris, renovata, revirescens, scalpta, semi- 

 spinata, simplex, sowerbyi, sp, spinea, spini- 

 costata, spinifera, spinigera, spinosa, sub- 

 costata, subdecorata, subirregularis, sub- 

 marginata, subsimplex, subspinosa, sub- 

 striata, sulcata, tridactyla, umbilicata, zur- 

 cheri 



Sonninia,, 13, 14, 128, 265, 286, 287, cciii ; descent 

 of, 110; allied to Pleuroceras and Amaltheus, 

 110; from Haugia, 144; a cryptogenetic 

 scries, 314 ; spp. illustrate retrogression, 

 315; horizon of, at Dundry, 316; order of 

 changes in retrogression, 316 ; groups of, 



