Amphipod comensual on an anemone, possibly Anthopleura balli (Cocks). Under a large stone on the lower shore.
No identification made yet.
No interactions present.
Amphipods are difficult enough to identify when looking down a microscope because, to follow the keys, most of the anatomical features that need to be examined are very small; some of these are best viewed after micro-dissection.
While some of the larger animals can be identified to family with a good macro image I'm afraid this isn't one. There is a large eye,the antennae seem to be similar in length and there is a well developed gnathopod so it might be a gammarid but I can't see the critical features that would confirm.
An interactive, on-line key to amphipod families that uses the Intkey program can be found at
Lat/Lng: 50.5443, -4.982
OS grid ref: SW888758