Annual Report of the Board of Regents of the Smithsonian Institution, Volume 11

age of bronze age of stone America Ammonites ancient animal appear Archæology arms beaks beam birds bivalves body bones called coast collections colored Cowries crawl creatures cretaceous cuttles Denmark edge eggs Eocene eyes Family feet flattened foot fossil fringed furnished Gasteropods genera genus gills Haüy Heteropods hinge hole horny inches Indian instruments iron islands Kattegat Kjoekkenmoedding known lacustrine Lake layer lens less ligament Limpets living magnetic mantle memoir microscope mollusks Moosseedorf mouth Muricide museum natural history nearly North notch object observations oolitic operculum outer lip Periwinkles pillar plaits plates points present Prof Pteropods regions resembles retractile road rocks round scarcely Sea-hares shape shell shore side siphuncle skin Smithsonian Institution snails sometimes species specimens spiral spire surface Switzerland teeth temperature tentacles thin tion tooth tribe tropical tube United valves West whirls