_Amphitragulus_.
_Amplexus; coralloides_.
_Ampyx_.
_Anachytes_.
_Anchitherium_.
_Ancyloceras; Matheronianus_.
_Ancylotherium Pentelici_.
_Andrias Scheuchzeri_.
_Angiosperms_.
Animal Kingdom, divisions of.
_Anisopus_.
_Annelida_, of the Cambrian period; of the Lower Silurian; of the
Upper Silurian; of the Devonian; of the Carboniferous.
_Annularia_.
_Anomodontia_.
_Anoplotheridoe_.
_Anoplotherium; commune_.
Ant-eaters.
Antelopes.
_Anthracosaurus Russelli_.
_Anthrapaloemon gracilis_.
_Antilocapra_.
_Antilope quadricornis_.
Antwerp Crag.
Apes.
_Apiocrinus_.
_Apteryx_.
Aqueous rocks.
_Arachnida_ of the Coal-measures.
Aralo-Caspian Beds.
_Araucaria_.
_Araucarioxylon_.
_Arca; antiqua_.
_Archoeocidaris_.
_Archoeocyathus_.
_Archoeopteryx; macrura_.
_Archoeospoerinoe_.
_Archimedes; Wortheni_.
_Archiulus_.
Arctic regions, Miocene flora of.
_Arctocyon_.
Arenaceous rocks.
_Arenicolites; didymus_.
Arenig rocks.
Argillaceous rocks.
Armadillos.
_Artiodactyle Ungulates_.
_Asaphus; tyrannus_.
_Ascoceras_.
_Aspidella_.
_Aspidura loricata_.
_Astarte borealis_.
_Asterophyllites_.
_Asterosteus_.
_Astroeidoe_.
_Astroeospongia_.
_Astylospongia; proemorsa_.
_Athyris; subtilita_.
Atlantic Ooze.
_Atrypa; congesta; hemispoerica; reticularis_.
Auger-shells.
Aurochs.
Aves (_see_ Birds).
_Avicula; cantorta; socialis_.
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