of the Jurassic; of the Miocene.
_Amphicyon_.
_Amphilestes_.
_Amphispongia_.
_Amphistegina_.
_Amphitherium; Prevostii_.
_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_.
"Avicula contorta Beds".
_Aviculidoe_.
_Aviculopecten_.
_Axophyllum_.
Aymestry Limestone.
Azoic rocks.

_Baculites; anceps_.
Bagshot and Bracklesham Beds.
_Bakewellia_.
_Baloena_.
Bala Group.
Bala Limestone.
_Balanidoe_.
_Banksia_.
Barbadoes Earth.
Barnacles.
Bath Oolite.
Bats.
Bears.
Beaver.
Beetles.
_Belemnitella mucronata_.
_Beleminites; canaliculatus_.
_Belemnitidoe_.
_Belemnoteuthis_.
_Belinurus_.
_Bellerophon; Argo_.
_Belodon; Carolinensis_.
_Belosepia_.
_Beloteuthis subcostata_.
Bembridge Beds.
_Beryx; Lewesiensis_.
_Beyrichia; complicata_.
Bird's-eye Limestone.
Birds, of the Trias; of the Jurassic; of the Cretaceous; of
the Eocene; of the Post-Pliocene.
_Bison priscus_.
Bituminous Schists of Caithness.
Bivalves (_see_ Lamellibranchiata).
Black-lead (_see_ Graphite).
Black-River Limestone.
_Blastoidea_; of the Devonian; of the Carboniferous.
_Boidoe_.
Bolderberg Beds.
Bone-bed, of the Upper Ludlow; of the Trias.
Bony Fishes (