|  | site | site # (info) | collection date | kind | depth | substrate | salin | comments | reference | 
| A | Wrightsville Beach, Wrightsville, North Carolina, USA | 1281 
  map | 1975 or earlier |  | intertidal | sand and mud |  | Numerous specimens.  From sand and mud flats.  paratypes AMNH 819, 820 from Wrightsville Beach, North Carolina, USA. | Crezee M (1975): 775 | 
| B | estuary of the White Oak River, opposite Swansboro (Swannsborough, New Town, Bogie, Bogue, Weeks Point, The Wharf), North Carolina, USA | 1282 
  map | 1975 or earlier | type locality | intertidal | sand and mud |  | Numerous specimens.  From sand and mud flats.  Holotype AMNH 815, paratypes AMNH 816-818 from estuary of the White Oak River opposite Swansboro.  Usually found beneath the surface two centimeters of sediment. | Crezee M (1975): 775 | 
| C | western end, Bogue Bank, North Carolina, USA | 1283 
  map | 1975 or earlier |  | intertidal | sand and mud |  | Numerous specimens.  From sand and mud flats.  Usually found beneath the surface two centimeters of sediment. | Crezee M (1975): 775 | 
| D | Radio Island, near Beaufort, North Carolina, USA | 1284 
  map | 1975 or earlier |  | intertidal | sand and mud |  | from two locations on Radio Island.  Numerous specimens.  From sand and mud flats.  Usually found beneath the surface two centimeters of sediment. | Crezee M (1975): 775 |