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Porth y Garan, Holy Island (Holyhead Island, Ynys Gybi), Anglesey, North Wales, United Kingdom
latitude: 53.283333 53 17 00 N
longitude: -4.633333 004 38 00 W
Precision of location: Alexandria Digital Library (with NGA GNDB data)
Site Named Here: By name of island, bay, strait, lake, river, or stream, etc., named in source publication
| Monocelis lineata | 1958-1961 | muddy coarse sand with pebbles | occasional at MTL. | |
| Monocelis lineata | 1958-1961 | fine sand with pebbles | occasional at LWN. |