INDEX 



Heavy type marks accepted species, their figures and technical descriptions. Italic type shows 

 names, etc., revised. Roman type denotes casual mention of species, etc., and all general matter. A 

 * marks a species foreign to the scope of the monograph, geographically, geologically, or technically. 

 Species are indexed under trivial names, but listed under generic. Species casually mentioned in 

 articles which describe others of the same genus have seldom been indexed. 



aalense, Grammoceras, PL 31, figs. 15, 16, see 

 misera, Cotteswoldia ; PL 32, figs. 1, 2, 

 superba, C. ; PL 32, figs. 3-6, aalense, Pley- 

 dellia; PI. 32, figs. 7, S, subcandida, Cottes- 

 woldia; PL 32, figs. 9, 10, burtonensis, 

 Walkeria ; p. 192, see spp. var. above 



aalense, Grammoceras, 44, 54, 222, 227, 244, 

 cxxxiv, cxxxv, cxxxvii, cxxxix 



aalense, Harpoceras, 37, 176, 192, 197, 253, 255, 

 clxxxii ; analysis of species so named, 193 



aalense type, species of the, xxxv 



aalensis, Ammonites, 12, 28, 37, 54, 62, 127, 178, 

 182, 184, 192, 194, 197, 198, 248, cxli 



cf. aalensis, Ammonites, 259 



Aalensis hemera, vi, xxxv ; strata of, xxxv, ccviii 



aalensis, Ludwigia, 190, 192 



aalensis, Pleydellia, PI. 32, figs. 3-6; p. 192 

 (Grammoceras aalense) ; Suppl., Figs. 112, 

 113, p. clxv ; p. cxxxvii 



aalensis, Pleydellia, hemera, ccv 



aalensis costula, Ammonites, 237, 238 



Aalenian stage, ccv 



Abnormal form, 75; specimen, xcvii ; variation, 

 289 



Abnormalities of septa, 381 



Abnormality, hypostrophic, xcvii 



abnormis, Sonninia, PI. 85, figs. 4-6 ; pp. 377, 387, 

 404 



Absorption of living chamber, 312 



acanthodes, Sonninia, Pis. 58, 59, 60, 63, fig. 1 ; 

 PI. 100, fig. 8 ; pp. 319, 390, 419 ; 301, 317, 318 



Acanthodes-stock, differential characters of, 331 



Acanthopleuroceras, clxix 



Acme, 357 ; and Inferior Oolite, excix : of genetic 



series, cc ; genetic, cc ; morpliogenetic, ccii 

 actaeon, Ammonites, 14 ; Harpoceras, 13 

 acutum, Arieticeras (hemera), ccv ; Grammoceras, 



163 

 acutus, Ammonites, 24 

 Additional species, clxi 

 adicrum, Harpoceras, 346, 347 ; Hainmatoceras, 



13 

 Adult chai-acters of S. zigzag, 272 

 iEgoceras, 14, 129 ; belcheri, intermedium, lias- 



sicum 

 ^goceratidse, 14, 16, 127, 287 

 iEgoceratinae, 14 

 affine, Pelecoceras, 175 

 affinis, Ammonites, 228, 229 

 affinis, Hudlestonia, PI. 38, figs. 1-8 ; p. 228 

 Affinity, criteria of, i 

 Agassiceras ; striaries, miserabile 

 Age of specimen, causing difference in description, 



xciv 

 Ages, ccv 



agria, Strophogyria, Suppl., Fig. 19 in text, p. lxii 

 Alderley, xxviii 



algovianus, Ammonites, 127, 132 

 alsaticum, Harpoceras, 304 

 alternata, Sonninia, PL 76, figs. 7-9; PI. 77, 



figs. 3-5 ; PI. 103, fig. 7 ; pp. 346, 390, 424 

 Alticarina, iv 



Alticarinate, cvi ; (series), cxix 

 Alum-shale, 168, 175, 203 

 Alum Shales, above, and variabilis, ccix 

 Amaltheen, 287 



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