INDEX. 255 



PAGE 



Pterodactyle, flying reptile of the Oolite, figured, . . 138 



Pterozamites, pinnate leaf of, Triassic era, . . . 125 



Pterygotus angiicus, from Lower Old Red, figured, . 95 



Pterygotus, upper Silurian species, figured, . . 89 



Radiata, aspect and apparent functions of, . 60 



Radiolites, cretaceous bivalve, figure of, . . . 146 



Rain-prints, or impressions of ancient showers, ... 94 



Ramsay, Professor, on Permian glaciers, .... 115 



Representative species, what is meant by, ... 50 



Reptiles, carboniferous, lowly nature of, . . . . 110 



Reptiles, gigantic secondary, their functions, . . . 185 



Reptiles of the Old Red, still doubtful, . 99 



Rhizodus, sauroid fish, jaw and dentition of, . . Ill 



Rock-systems of geology, arrangement of, ... 73 



Rotalia, cretaceous foraminiferous organism, . . . 144 

 Rytina, extinct dugong of Kamtschatka, . . . .172 



Sauroid fishes of Carboniferous era, .... 110 



Scaphites, characteristic chalk cephalopod, . . . 147 



Scriptural reconciliations, in utility of, . . . 245 

 Seals, sub-fossil, in pleistocene strata, . . . .167 



Sedimentary, or water-deposited rocks, defined, ... 70 



Sigillarise, gigantic trees of the Carboniferous era, . . 104 



Silurian era, physical and vital characteristics, ... 83 



Silurian flora, scanty and fragmentary, .... 84 



Siphonia, silicified spongiform organ in chalk, . . . 144 



Sivatherium, sub-fossil ruminant of India, . . . 159 



Solitaire, extinct bird of Rodriguez, .... 172 



Species, duration of, in time, ..... 228 



Species representative and identical, .... 50 



Spirifer, carboniferous species, figured, .... 109 



Spirorbes, calcareous tubes of, in coal-measures, . . 106, 108 



Sponges and their function in cretaceous strata, . . . 143 



Star-fish, Silurian, figured, ...... 87 



Stigmaria, roots of the carboniferous sigillaria, . . . 104 



Stone implements of the upper pleistocene, . . . 170 



Stringocephalus, characteristic Devonian shell, figured, . . 94 



Strophomena, Silurian brachiopod, figure of, . . 88 



Stylonurus, crustacean from Forfarshire Old Red, . . 95 



Succession or progression in natural events, . . . 235 



Superposition of strata, key to geological time, ... 70 



Telerpeton, lacertilian reptile from Elgin sandstones, . . 126 



Temperature, internal, its effect on climate, ... . 189 



Terebratula, carboniferous species, figured, . . ] 09 

 Tertiary and post-tertiary strata, defined, . . .153 



Tertiary, its different chronological stages, . . . 157 



