Hello Pall, The localities I mentioned in my reply to Steven can be divided into two groups - those north of, and those south of Cape Cod. The last three I listed are on the south shore of Cape Cod. I wouldn't expect the species at these locations to be very similar to the species in Iceland. The south shore of the Cape has very different fauna from the north shore, even though at places they are only 10 to 15 miles apart. The south shore is warmed by the Gulf Stream, which flows northward from the Caribbean. Several of the species found there range southward all the way to Florida or beyond - yet they do not range 15 miles north to the other shore of the Cape. This makes Cape Cod a particularly interesting place to collect. By driving a few miles you can go from rocky, rockweed-covered, surf-washed shores with water temperature of 45 degrees, to shallow, sandy beaches with grass and sea lettuce, and water temperature of 65 degrees. The other places I mentioned are all north of Cape Cod. These are cold water habitats. What sets Manomet apart from the others in this group is the extremely rocky nature of the intertidal area. The beach here is composed largely of boulders, with intermittent tidal pools. The other northern localities I mentioned are more sandy or muddy than rocky. I haven't seen the shoreline of Iceland, but if your collecting areas are largely rocky, with rockweeds like Fucus and Ascophyllum, that would account for the similarity between your fauna and that of Manomet point. Regards, Paul M.