ccxlviii 



INFERIOR OOLITE AMMONITES 



Retrogression, 308 ; in development, 289 ; charac- 

 ters of, 289 ; the reversal of progression, 290 ; 

 law of, latest acquired characters lost first, 

 294 ; in Zurcheriae, 299 ; illustrated in crassa 

 stock, 348; law of, relating to compression 

 of whorls, 348 



Retrosiphonata, 126 



Reversion, 139; in development, 159 



revirescens, Sonninia, PI. 70, fig. 1 ; PI. 100, fig. 9 ; 

 Figs, in text, 19, p. 389; 45, p. 416; 71. p. 

 443 ; pp. 324, 417 



Reynes, P., vii, viii, ix, cxcvii 



Reynesella, Suppl., p. cix ; inops, juncta, lineata, 

 piodes, rodburgensis 



Reynesella, from Hugia, cxi ; classification, cxcviii 



Reynesia, Suppl., p. ciii ; amoena, benigna, ccela, 

 furcillata, intermedia, laxa, lepida 



Reynesia, classification, cxcviii 



Rhaeboceras, Suppl., p. lxxii ; tolutarium, tortum 



Rhacboceras, from Crickia, Ixxiii ; classification, 

 cxcviii 



rheumatisans, Ammonites, 109, vii, x 



rhodanica, Dumortieria, Suppl., p. clxxix 



rhodanica, Dumortieria, 248 



Rhone basin, xiii ; Grammoceras in, 168 



Rhyncbonella, 47, 165 



Rhynchonellao, 52 



Rhynchonella ringens beds, date of, ccvii 



Ribs, primary, 16 ; secondary, 16 ; and striae = radii, 

 57; v-shaped, 57, 69, 73; changes of, 134; 

 arcuate, 142, 158 ; subarcuate, 158 ; direct, 

 231 ; subdirect, 231 ; reclined, 280 ; falciform, 

 73, 294 ; scythe-shaped, 294 ; sickle-shaped, 

 294 ; undulate, 307 ; duplicated, homologous 

 to spines, 345 



Ribbing, types of, 124 



Richardson, L., lxvi, cxlix, clxx, clxxix cxci 



ringens, Rhynchonella, 8, 9 ; beds, date of, ccvii 



Roadstone, ccix ; date of, ccvi 



Robin Hood's Bay, 175 



Robinswood Hill, clxx 



robustum, Graphoceras, Suppl., PI. 15, figs, 9 11, 

 p. xcv 



robustum, Phymatoceras, xxx 



robustus, Ammonites, vii, x 



Rodborough Hill, 90, 94, 96, 100, ex 



rodburgensis, Reynesella?, Suppl.. PI. 17, figs. 1- 

 3, p. ex 



Roman province, xiv 



Romani, Ammonites, 305, 306 ; Dorsetensia, 307, 



310 

 Rostration, exeix ; increase of, influence on shape 



of radial line, cvi ; progressive decline of, 



lxxx ; degree of, cci 

 Rostrum, projection of, cci 

 rotabilis, Braunsella?, Suppl., PI. 17, figs. 7-9: 



p. cii 

 Rubbly Oolite, 3 

 rubescens, Lytoceras, 165 

 rudidiscites, Hyperlioceras, PI. 18, fig. 1 ; PI. 17, 



figs. 3, 4 ; p. 94 (H. discites) ; Suppl., Fig. 



94, p. clxv ; p. exxiv 

 rudidiscites, Hyperlioceras, ccii 

 rudis, Ludwigella. PI. 15, figs. 11-13 ; PI. A, fig. 



7, p. 103 (Ludwigia rudis) ; Suppl., Fig. 47 



in text, p. lxxxv 

 rudis, Ludwigia, PL 15, figs. 11-13, see rudis, 



Ludwigella; PL 15, figs. 14, IS, subrudis, L. ; 



PI. IS, figs. 16, 17, angulifera, Braunsina ; 



<p. 103, see spp. above 

 rudis, Ludwigia, lxxxv, ci 

 rugosa, Ludwigella, Suppl., PI. 20, figs. 34-36 ; p. 



xc 

 rugosus, (Ecotraustes, PI. 21, figs. 1, 2 ; Suppl., 



Fig. 189, p. exevi ; p. exciv 

 Rursicostate (series Fontannesia), clxxxix 

 Rursiradiate, iii ; group, xxiii 

 Rursiradius, iii 

 Rursi-subflexiracliate, x 

 Rursum, iii 



rustica, Welschia, Suppl., PI. 4, figs. 16-18 ; p. Iii 

 rustica, Dumortieria, PI. 45, figs. 4, 5, 10-12 ; p. 



259 (D. subundidata) ; p. clxxxvi 

 Rutland, 91 



Saddle, siphonal, 217 



Saddles and lobes, 219 



Saemanni, Ammonites, 203, cxlix, cli 



Siemanni, Grammoceras, PL 34, figs. 1, 2, see 



pachu, Pseudogrammoceras ; PL 36, figs. 



6-8, see thrasu, Pseudogrammoceras ; j>. 203, 



see spp. above 

 Saemanni, Grammoceras, cxlv, cli 

 Saemanni, Hildoceras, 203 

 saemanni, Pseudogrammoceras, Suppl., Fig. 145 ; 



p. cxlix 



