INDEX 



CCXXlll 



Degeneration, lxiv ; of spinicostse into nodicostse, 

 357 ; features of, cxxxi ; and septicarina, cliii, 

 clvii ; of carina, see carina 

 deletum, Pseudographoceras, Suppl., PI. 11, figs. 



22 24, p. xci 

 delicata, (Edania, Suppl., PI. 21, figs. 10-12, p. 



cviii 

 delicata, Walkeria, Suppl., Fig. 122, p. cxl 

 deltafalcatus, Ammonites, 82 

 Deltiradiate (series), cxvii 

 Deltoceras, cxix, see Deltotoceras ; subsectum 

 Deltoid, cxvii 

 Deltoidoceras, Suppl., p. cxvii ; astrictum, ido- 



neum, subdiscoideum 

 Deltoidoceras, from Deltotoceras, cxix ; classifica- 

 tion, cxcviii 

 Deltotoceras, Suppl., p. cxix ; cuneatum, dis- 



coideum, subsectum, triangulare 

 Deltotoceras, classification, cxcviii 

 Denckmann, Dr. A., 83, 85, 87, 146, 153, 169, 

 174, 182, 200, 202, 203, 205, 207, 209, 211, 

 vii, viii, ix, x, xi, xvii, xxvi, xxvii, cxliv, cxlviii ; 

 on Amm. Ssemanni, etc., 206 ; and Denck- 

 niannia, xvii 

 Denckmannia, Suppl., pp. ix, xvii; aspera, bredo- 

 nensis, iserensis, malagma, obtecta, torquata, 

 tumefacta 

 Denckmannia, clxix ; from Haugia, xxii ; classifi- 

 cation, cxcviii 

 densicostata, Sonninia, PI. 88, figs. 8, 9 a, p. 



375 

 Densicostate, iii 

 Densisept, 111, cc 

 Densiseptate, v 

 Depaoceras, Suppl., p. lxxvii ; fallax, formosum, 



hamatum 

 Depaoceras, from Lucya, Paineia, lxxiv ; suggested 

 relationship to carinatitabulate forms, cxiv ; 

 from Deltoidoceras, cxvii ; classification, 

 cxcviii 

 Deposit, no influence on Ammonites, xv 

 Deposits, coastal, 455 ; fossiliferous, 455 ; Ammoni- 



tiferous, 456 ; correlation of, ccvi 

 depressus, Ammonites, 216 

 Deroceras, 129, 295 ; character of spines, 314 ; 



character of tubercles of, iii 

 Descendants of S. zigzag, 272 

 Description, note concerning, xciv 



Descriptions, specific, interpretation of, cciii 



Desori, Ammonites, 97, 98 ; Harpoceras, 97 



desori, Hyperlioceras, PI. 17, figs. 6, 7, p. 97 ; 

 Suppl., Fig. 89 ; Fig. 90, p. clxv ; p. cxxii 



despecta, Fontannesia, PL 47, figs. 6, 7, p. 262 

 (Dumortieria grammoceroides) ; p. cxci 



Deux-Scvres, 172 



Development, laws of, 134 ; omission of inter- 

 mediate stages in, 159 ; of ventral area, 

 changes in, 159 ; reversion, 159 ; omission of 

 dissimilar stage, 224 ; introduction of modifi- 

 cations, 224 ; more rapid earlier inheritance 

 of latest stages, 224 ; elimination of useless 

 stages, 224 ; persistence of embryonic cha- 

 racters, 224 ; stages of, 289 ; renewed pro- 

 gressive, 290; renewed progressive, example 

 of, 334 ; formula? of, 382, 383 ; temporary 

 or arrested, li ; arrested, specimen showing, 

 lxxiv ; comparative (Dumortieria) clxxxiv ; 

 relative, cxcix ; phenomena of, cxcix ; normal, 

 stages of, cci ; cycle of, ccii ; see Hildo- 

 ceratidae 



Developmental variation, 289 



Dew bed, suggested equivalence to Gloucestershire 

 Cephalopod bed, 7 ; date of, ccviii 



Dewalque, see Chapuis & Dewalque 



dii'alensis, Parkinsonia, 272 



Differentiation, formulae of, 382, 383 



digna, Canavarina, Suppl., fig. 127, p, clxvii ; fig. 

 129, p. cxli 



Digue, Ammonites from, 301 



Dimensions, terms for, cxcvii 



dimorphum, Morphoceras, ccii 



diphyes, Dumortieria, PI. 42, figs. 13-15; PI. 43, 

 figs. 5-7, p. 253 (D. radiosa) ; p. clxxx 



Direct ribs, 231 



Discitaj hemera, vi 



Discitae, hemera, strata of, ccvii 



discites, Ammonites, 94, cxxii 



*discites, Hyperlioceras [Foreign], Fig. 87, p. 

 clxv ; Fig. 88, p. cxxii 



discites, Hyperlioceras, PI. 16, figs. 12, 13, see 

 discitiforme, Hyperlioceras; PI. 17, figs. 1,2, 

 liodiscites, H. ; PI. 17, figs. 3, 4, rudidiscites, 

 H. ; PL 17, fig. 5, subleve, H. ; PI. lb', figs. 1, 

 2, rudidiscites, H. ; PI 18, fig. 3, subleve, H. ; 

 PI. IS, figs. 4, 5, lsevis, Darellia ; p. 04, see 

 spp. above 



