Republication of Conrad's Fossils of the Medial Tertiary of the United States

Acad Amphidesma angulated apex Arca Astarte basal margin beaks body whorl Busycon cardinal teeth Cardium Choptank river City Point coast compressed concave concentric Conr Conrad convex convex-depressed cordate crenate Cytherea disk dorsal margin elevated Eocene EXPLANATION OF PLATE Figure flattened Foss fosset fossil Fusiform Fusus genus grooves hinge impressed lines inequilateral inferior valve inner margin James river lateral teeth lines of growth Locality longitudinal Lower Tertiary Lucina lunule Mactra margin obliquely margin profoundly Mary's river Maryland Marylandica Medial Tertiary middle Miocene narrow Neuse river Newbern North Carolina Nucula numerous Observations obsolete obtuse occurs ovate Patuxent river Pecten Pectunculus Plate 45 posterior extremity posterior margin posterior side posterior slope profound recent species rectilinear ribs right valve sand Scapharca Silliman's Journ specimen striæ suborbicular subovate Tellina Tertiary formations thick tooth transverse umbo umbonial slope undulations Upper Tertiary Venus Virg Virginia wrinkles Yorktown