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Acad Academy of Natural Amer aperture beak body whorl Calvert Formation Cetotherium Charles county Chesapeake Beach Choptank Formation Coll Collection.—U. S. National Museum Collections.—Maryland Geological Survey Collections.—U. S. National columella Conrad convex Cope Cove Point Creek curved Description Description.—Shell diameter dorsal Dover Bridge Ehrenberg elevated elongate Eocene Flag Pond Fossils Genus Governor Run groove height Johns Hopkins University Jones Wharf Jour left valve Length longitudinal Mary's Formation Mary's River Maryland marylandica Medial Tertiary Meek miles south Miocene Check List Misc Natural Sciences oblique obtuse Occurrence.—Calvert Formation Occurrence.—Choptank Formation Occurrence.—St Pecten Phila Philadelphia Academy Plate Pleiocene Plum Point Proc prominent ribs ridge right valve rounded Scapharca shell slightly Smith south of Chesapeake species specimens spire striae surface suture teeth Thecachampsa thick Trans transverse Turritella U. S. Geol U. S. National Museum umbilicus ventral Wagner Free Inst Whitfield width zocecia Zone