INDEX. 



AcRODUs, a genus of fossil sharks, i. 

 288. 



Actinocrinites, 30-dactylus, Miller's 

 restoration of, i. 429. 



Adapis, character and place of, i. 82. 



Agassiz, his recognition of the scales of 

 fishes in coprolites, i. 191 ; on causes 

 of the death of fishes, i. 122 ; on ori- 

 gin of cololites, i. 200 ; on Claris tur- 

 tle, i. 257 ; his classification of fishes, 

 i. 268; documents consigned to him 

 by Cuvier, i. 267 ; his new orders of 

 fishes, i. 269, 270 ; geological re- 

 sults established by, i. 272, 273; 

 his new arrangement of Monte Bolca 

 fishes, i, 285 ; his discovery of be- 

 lemnites with ink bags, i. 374 ; on 

 the bilateral structure of radiated 

 animals, i. 415. 



Agnostus, a genus of trilobites, i. 391. 



Aichstadt, pterodactyles found at, i. 

 221. 



Aix, fossil fishes of, i. 285. 



Allan, Mr., his paper on Antrim be- 

 lemnites, i. 377. 



Amber, fossil resin from lignite, i. 520. 



Amblypterus, fossil genus of fishes, i. 

 278. 



Ammonites, formed by cephalopodous 

 niollusks, i. 333 ; characteristic of 

 different formations, i. 333 ; geolo- 

 gical distribution of, i. 334 ; geogra- 

 phical ditto, i. 335 ; extent and num- 

 ber of species, i. 334 ; size of, i. 334 ; 

 sub-genera of, i. 334 ; shell com- 

 posed of three parts, i, 336 ; exter- 

 nal shells, i. 337, 338 ; outer cham- 

 ber contained the animal, i. 337 — 

 339 ; double functions of shell, i. 

 338 ; contrivances to strengthen 

 shells, i.339 — 344; ribs, architectu- 

 ral disposition of, i. 341 ; transverse 

 plates,useoftheir foliated edges, i.344 

 — 349 ; compound internal arches, i. 

 349 ; siphuncle, organ of hydraulic 

 adjustment, i. 350, 351 ; siphuncle, 

 occasional state of preservation, i. 

 351, 352 ; siphuncle, placed diffe- 

 rently from that of nautili, i. 353 ; 

 siphuncle. Dr. Front's analysis of, 

 i. 352 ; air chambers, more complex 

 in ammonites than in nautili, i. 350 ; 



ammonites, how difl^erent from nau- 

 tili, 353 ; Von Buch's theory of, i. 

 352 ; uses of lobes and saddles in, 

 i. 354 ; concluding observations upon, 

 i. 355 — 357  probable place of heart 

 in, ii. 68. 



Anarrhicas, palatal teeth of, i. 281. 



Animals, final cause of their creation, 

 i. 101 ; lower classes of, predomi- 

 nate in earlier strata, i. 115 ; extinct 

 races, how connected with existing 

 species, i. 581 ; causes of their sud- 

 den destruction, i. 122 ; small num- 

 beradapted for domestication, i. 100 ; 

 terrestrial, how buried in strata of 

 fresh water and marine formation, i. 

 128. 



Animal enjoyment, one great object of 

 creation, i. 293, 301. 



Animal kingdom, four great divisions of, 

 coeval, i. 61 ; early relations of, i. 87. 



Animal life, extent of upon our globe, 

 i. 102 ; progressive stages of, i. 115; 

 remains of in secondary strata, i. 72. 



Animal remains, most instructive evi- 

 dences in geology,!. 128 ; preserved 

 chiefly by agency of water, i. 126. 



Annelidans, fossil remains of, i. 387. 



Anning, Miss, her discovery of ink bag 

 within horny sheath of belemnite, i. 

 374 ; her discoveries at Lyme Regis, 

 passim; her observations on connec- 

 tion of lignite with pentacrinites near 

 Lyme, i. 437 ; herdiscovery of fossil 

 pens and ink bags of Loligo, i. 304. 



Anoplotherium, character and place of, 

 i. 81. 



Anstice, Mr. W., his discovery of in- 

 sects in coal formation, i. 405 ; me- 

 galichthys, &c. found in Coalbrook 

 Dale, by, ii. 43. 



Ant eater, humerus like that of mega- 

 therium, i. 154. 



Anthracotherium, character and place 

 of, i. 82. 



Apiocrinites, or pear encrinite. Miller's 

 restoration of, i. 428. 



Arachnidans, two great families of, 

 found fossil, i. 405. 



Arago, M., on expenditure of rain 

 water, i. 557 ; on Artesian wells iu 

 France, i. 564. 



