U.S. Geological Survey: Science for a Changing World - USGS visual identifier and link to main Web site at http://www.usgs.gov/

Mollusks common in the Choptank Formation. For a more detailed explanation, contact Lauck Ward at lwward@vmnh.net.

PLATE 6.
[Mollusks common in the Choptank Formation]


FIGURE 1. Stewartia anodonta (Say, 1824).
    Right valve of specimen (USNM 405221) from Drumcliff (Jones
    Wharf), on the Patuxent River, St. Marys County, Md. (USGS
    Locality 26557); length 46.2 mm, height 49.0 mm.
  2. Lucinoma contracta (Say, 1824).
    Right valve of specimen (USNM 405225) from Calvert Beach, on the
    Chesapeake Bay, Calvert County, Md.; length 37.8 mm, height 34.0
    mm.
  3. Timothynus subvexa (Conrad, 1838).
    Right valve of specimen (USNM 405227) from Calvert Beach, on the
    Chesapeake Bay, Calvert County, Md.; length 35.6 mm, height 32.1
    mm.
  4. Astarte thisphila Glenn, 1904.
    Left valve of holotype specimen (USNM 405239) from Drumcliff
    (Jones Wharf), on the Patuxent River, St. Marys County, Md.
    (USGS Locality 26557); length 27.0 mm, height 25.3 mm.
  5. Isognomon (Hippochaeta) sp.
    Left valve of nearly complete specimen (USNM 405192) from Long
    Beach, on the Chesapeake Bay, Calvert County, Md.; length 105.0
    mm.
  6, 7. Ecphora meganae Ward and Gilinsky, 1988.
    6. Apertural view of holotype (USNM 405320) from Drumcliff (Jones
    Wharf), on the Patuxent River, St. Marys County, Md. (USGS
    Locality 26557); height 64.6 m.
    7. Posterior view of the same specimen.
  8. Turritella p.
    Apertural view of specimen (USNM 405306) from Drumcliff (Jones
    Wharf), on the Patuxent River, St. Marys County, Md. (USGS
    Locality 26557); height 21.4 mm.
  9. Scaphella virginiana Dall, 1890.
    Apertural view of neotype (USNM 405342) from Drumcliff (Jones
    Wharf), on the Patuxent River, St. Marys County, Md. (USGS
    Locality 26557); height 74 mm.

U.S. Department of the Interior, U.S. Geological Survey
URL: https:// pubsdata.usgs.gov /pubs/circ/2004/1264/html/trip9/plate6.html
For more information, contact Lauck Ward.
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