| site | site # (info) | collection date | kind | depth | substrate | salin | comments | reference | |
|---|---|---|---|---|---|---|---|---|---|
| A | estuaries around Norfolk, Virginia, USA | 1884 | 1948 or earlier | shallow | brackish | from collection records ranging 1931 thru 1948. | Ferguson FF, Jones ER (1949): 436, 438 | ||
| B | Saint Vaast la Hougue (St. Vaast-la-Hougue), France | 1203 | 1913 or earlier | type locality | Atlantic Ocean. | Graff Lvon (1913): 56 | |||
| C | Saint Vaast la Hougue (St. Vaast-la-Hougue), France | 1203 | 1863 or earlier | default type | Claparede E (1863): from Ferguson 1954 (citation)- p. 141 |