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north flat (Nordwatt), Helgoland Island, Germany
latitude: 54.200001
longitude: 7.895833
Precision of location: Gauged from chart or map
Site Named Here: By name of island, bay, strait, lake, river, or stream, etc., named in source publication
| Philactinoposthia helgolandica | Oct 1964 | shell | museum specimen number: SMF 3331-34 | |
| Postmecynostomum pictum | Aug 1963 | shell | detritus rich | |
| Proschizorhynchus helgolandicus | 1938 or earlier | fine sand | au N.E. de la dune, sable quarrtzeux fin assez pur, jusq'a environ 1.5 m au-dessous du niveau des basses mers. |