|   | 
site | 
site # (info) | 
collection date | 
kind | 
depth | 
substrate | 
salin | 
comments | 
reference | 
| A | 
Sylt Island (North Frisian Islands), North Sea | 
313
  map | 1972-1975 | 
  | 
  | 
  | 
  | 
semi-exposed beach slope, clean sand flat | 
Faubel A (1977): 68-69, Table 1 | 
| B | 
Sandy beach on eastern shore of Sylt.  Litoralstation (old littoral station), Biological Institute Helgoland, Biologische Anstalt Helgoland (BAH), List, Sylt | 
323
  map | May 1972 | 
  | 
eulittoral, littoral | 
sandy beach (middlelotic), sandy beach slope, sandy beach slopes and wadden areas, wadden areas | 
  | 
Sand beach, 3 specimens (chains of animals) | 
Faubel A (1974): 3, 28 | 
| C | 
Bakeman Beach, (Bakeman's Beach, Bakeman Cove), Cape Rosier, Maine, USA | 
347
  map | Jul 23, 2003 | 
  | 
tidal | 
sand and coarse sand, rocks and shells | 
  | 
shallow, subtidal, coarse sand with silt | 
: Hooge (unpublished) | 
| D | 
south harbor, Altes Dock, Helgoland Island, Germany | 
689
  map | Apr 1963 | 
type locality | 
3 m | 
coarse sand, gravel mix | 
  | 
  | 
Dorjes J (1968): 297; also biogeography and ecology on this and other German Bay species in (citation)- 78-115. | 
| E | 
West flatt (Westwatt, Westwattes), Helgoland Island, Germany | 
664
  map | Apr 1963 | 
  | 
  | 
gravel sediment | 
  | 
rock gully (felsrinnen) | 
Dorjes J (1968): 297; also biogeography and ecology on this and other German Bay species in (citation)- 78-115. | 
| F | 
near Tonne Helgoland III, Skitt-Gatt (Skittgatt channel), Helgoland Island, Germany | 
696
  map | Apr 1963 | 
  | 
5 m | 
chalk, gravel mix | 
  | 
  | 
Dorjes J (1968): 297; also biogeography and ecology on this and other German Bay species in (citation)- 78-115. | 
| G | 
north east wall (Nordostmauer), Helgoland Island, Germany | 
608
  map | Aug 1963 | 
  | 
5 m | 
fine sand | 
  | 
  | 
Dorjes J (1968): 297; also biogeography and ecology on this and other German Bay species in (citation)- 78-115. | 
| H | 
Seal Harbor, Maine, USA | 
1271
  map | Sep 2000 | 
  | 
subtidal | 
medium grained sediment | 
  | 
sexually mature specimens | 
Hooge MD, Tyler S (2003): 34 | 
| I | 
Seal Harbor, Maine, USA | 
1271
  map | spring, summer 1999 | 
  | 
subtidal | 
medium grained sediment | 
  | 
sexually immature specimens | 
Hooge MD, Tyler S (2003): 34 | 
| J | 
Reid State Park, Maine USA | 
320
  map | spring, summer 1999 | 
  | 
  | 
  | 
  | 
sexually immature specimens | 
Hooge MD, Tyler S (2003): 34 | 
| K | 
south harbor, Altes Dock, Helgoland Island, Germany | 
689
  map | Apr 16, 1963 | 
type locality | 
3 m | 
coarse gravel sand mixture | 
  | 
  | 
Dorjes J (1966): 187 | 
| L | 
Felsrinnen of West flatt (Westwatt, Westwattes), Helgoland Island, Germany | 
686
  map | Apr 25, 1963 | 
  | 
3 m | 
gravel sedimen | 
  | 
  | 
Dorjes J (1966): 187 | 
| M | 
near Tonne Helgoland III, Skitt-Gatt (Skittgatt channel), Helgoland Island, Germany | 
696
  map | Apr 28, 1963 | 
  | 
5 m | 
lime chalk powder | 
  | 
  | 
Dorjes J (1966): 187 | 
| N | 
north east wall (Nordostmauer), Helgoland Island, Germany | 
608
  map | Aug 17, 1963 | 
  | 
5 m | 
fine sand | 
  | 
  | 
Dorjes J (1966): 187 | 
| O | 
Station 2, south Grindöy (Grindoy, Store Grindoya), sand beach areas of Tromsø (Tromso), Norway | 
3233
  map | Aug-Sep 1969 | 
  | 
  | 
  | 
  | 
  | 
Schmidt P (1972): 24 |