|  | site | site # (info) | collection date | kind | depth | substrate | salin | comments | reference | 
| A | North Sea (Nordsee) | 29 
  map |  |  | 6-11 m | fine sand to clay |  |  | Bush LF (1981): | 
| B | Romo (Roem, Rom, Römö, Rømø) Island, (North Frisian Islands), Denmark, North Sea | 322 
  map | 1972-1975 |  |  | mud, sand |  | sublittoral | Faubel A (1977): 68-69, Table 1 | 
| C | north east wall (Nordostmauer), Helgoland Island, Germany | 608 
  map | Aug 1963 | type locality | 5 m | fine sand |  | Museum specimen number: SMF 2906-2910 | Dorjes J (1968): 130; also biogeography and ecology on this and other German Bay species in (citation)- 78-115. | 
| D | harbor entrance, Helgoland Island, Germany | 611 
  map | Apr 1963 |  | 6 m | clay mud |  |  | Dorjes J (1968): 130; also biogeography and ecology on this and other German Bay species in (citation)- 78-115. | 
| E | Tonne Dune (Duene) east #2, Helgoland Island, Germany | 612 
  map | Apr 1963 |  | 11 m | fine sand |  |  | Dorjes J (1968): 130; also biogeography and ecology on this and other German Bay species in (citation)- 78-115. | 
| F | Harbor entrance, ships  road, Helgoland Island, Germany | 613 
  map | Apr 1963 |  | 6 m | gravel sand mix |  |  | Dorjes J (1968): 130; also biogeography and ecology on this and other German Bay species in (citation)- 78-115. | 
| G | western part of Sylt Island | 614 
  map | Sep 1963 |  | 20 | fine sand |  |  | Dorjes J (1968): 130; also biogeography and ecology on this and other German Bay species in (citation)- 78-115. | 
| H | western part of Sylt Island | 615 
  map | Sep 1963 |  | 15 | fine sand and detritus |  |  | Dorjes J (1968): 130; also biogeography and ecology on this and other German Bay species in (citation)- 78-115. | 
| I | Reede, Helgoland Island, Germany | 656 
  map | Apr 1963 |  | 6 m | grave sand mix |  |  | Dorjes J (1968): 130; also biogeography and ecology on this and other German Bay species in (citation)- 78-115. |