| site | site # (info) | collection date | kind | depth | substrate | salin | comments | reference | |
|---|---|---|---|---|---|---|---|---|---|
| A | Manomet Beach, Monomet, Massachusetts, USA | 1827 | late 1960 s | type locality | spotty distribution, occurs in abundance where the dominant sand particle size is between 0.5 and 1.0 mm. | Riser NW (1981): 143 | |||
| B | Plum Island, Massachusetts, USA | 1824 | late 1960 s | spotty distribution, occurs in abundance where the dominant sand particle size is between 0.5 and 1.0 mm. | Riser NW (1981): 143 |