INDEX. 



PAOK 



Acanthodes, Lower Old Red species, figured, . . .98 



Acrogens, their aspect and function, .... 41 



Adiantites, gigantic fern from Irish Old Red, figured, . . 93 



J^pyornis, extinct bird of Madagascar, .... 164 

 Agassiz, Professor, quoted, .... 183, 201 



Agassiz, on immortality of animals, quoted, . . . 206 



Agencies, nature of, affecting the globe, . . .71 



Amblypterus, ganoid fish of coal-measures, . . . 110 



Ammonites, oolitic cephalopods, figured, .... 135 

 Amphigens, their aspect and function, .... 40 



Ananchytes, characteristic chalk sea-urchin, figured, . . 145 



Ancyloceras, characteristic chalk cephalopod, . . . 147 



Animal life, its governing conditions in space, ... 48 



Animals, systematic classification of, . . .57 



Annelid burrows, or tracks of marine worms (?), ... 94 



Anoplotherium, restored outline of form, . . . 156 



An tholites, fossil flowers of the Carboniferous, . . . 105 



Archseocidaris, carboniferous, plates and spine of, . . 107 



Archseogosaurus, carboniferous reptile, .... 110 

 Archaeology, interest and importance of, . . . .18 



Articulata, aspect and apparent functions of, . . . 63 



Avicula, oolitic species, figured, . . . . .134 



Barnacles, occurring fossil in oolite, .... 132 



Belemnites, internal shells of fossil cuttle-fishes, . . 135 



Bellerophon, carboniferous gasteropod, figured, . . . 109 



Bellinurus, limuloid carboniferous crustacean, figured, . . 108 



Beryx, fish of cretaceous epoch, figured, .... 148 

 Birds, occurrence of in cretaceous strata, . . . 149 



Birds, supposed first appearance of, . . . .127 



Boreal shells from valley of the Clyde, . . . .167 



Botanical arrangement, principles regulating, ... 33 



