I'm pretty certain this is a tunicate, since I can make out the siphons :) Ascidia nigra is a good ID, as the distribution fits the location! They're hard to ID when they're out of the water like this, haha :D Great spot!
The tunicate suggestion by Stavros is a good one too. I'll try to bring it to the attention of one on the marine biologists on the rangers team. I'm very much out of my comfort zone here!
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