INDEX TO VOL. I. 



Page. 

 ^.MBONYCHiA. — A genus of fossil bivalves. Greek, amhon, the boss of a 



shield, onyx, a claw. • 43 



Ambonychia radi-Sta 44-46 



Atrypa.— A genus of fossil Brachiopods. Name derived from the 

 Greek a, without, and trupa, a hole or perforation. It was 

 supposed that the shells of this genus had no foramen 

 under the beak hence the name. 



Atrypa oongesta ^36 



Atrypa nitida 137 



Atrypa reticularis l^t 



Atrypa neglecta , 138 



Atrypa cuneata • 138 



Atrypa increbescens 207 



Atrypa plena 208 



Atrypa hemiplicata 208 



Anas. — Latin, a duck 146 



Anas obscura. — The black duck , 149 



Anas sponsa. — The wood duck 146 



Anas carolinensis. — The green winged teal 153 



Anas discors. — Blue-winged teal.. 154 



Anas boschas — The mallard ■ • 156 



Audubon, Works of 240 



Argillaceous. — Containing clay, from the Latin Argilla, clay. 



Avicula. — A genus of bivalves. Jlvicula, Latin, a little bird 60 



Avicula emacerata. — A species of the Niagara Group 60 



Alces.— Latin, the Elk. The genus to which the moose,,deer belongs. 60 



Alces AMERICANA. — The moosc deer 6*^ 



AsTARTE Laurentiana 341 



American Geological History 395 



Boulder. — Any loose rounded mass of rock. 



Bear. — Black, Ursus Americanus 100 



Bear. — Grizzly, Ursus ferox 1^^4 



Bear. — Polar or White, Ursus marit'mius 100 



Bear. — The Cinnamon, Ursus Cinnamomum m 



Black Bear 1<^0 



Black Duck 146 



BoBLiNK, or Rice Bird 238 



Boulder Formation 321 



BucciNUM Undatum 342 



Balanus Uddevallenlis 344 



Bison Americanus. — The Butfalo. 346 



