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Could also be the mermaid's purse of a skate.
Not a problem
Yes, it is a lugworm castSo the lugworm is not there, but they created this as they were ingesting then digesting the sand. It's very interesting, you should read up on it :)
íslenska sauðkindin is simply "Icelandic sheep" in Icelandic. This is not the scientific name, just a common name. Otis aries is the scientific name, as it is a domestic sheep.
Before I made it I was trying to see if there was, makes sense now why I couldn't find anything! Thank you, will move them all over.
I think it is a species of Comb Jelly (Ctenophora), though it is hard to tell which one.
Amazing find! Absolutely incredible.I believe it is a green crab (Carcinus maenas) in one of its first benthic instars.
Looking at your third picture of its abdomen, this is a male green crab, due to the triangular shape (females are more rounded to allow them to hold their eggs).
Scientific name: Zalophus californianus
Scientific name: Odocoileus virginianus