Abstract

Turritella calvertensis, n. sp., T. calvertensis marylandica, n. subsp., T. calvertensis plumpointensis, n. subsp., and T. indenta chesapeakensis n. subsp., are described from the Calvert formation of the Chesapeake Bay region, Maryland; Turritella variabilis chancellorensis, n. subsp. and Cerastoderma chancellorensis, n. sp., from the St. Mary's formation at St. Mary's City, Maryland.

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