Marine invertebrates, part two

Jellyfish and hydrozoans are only one type of animal that gets washed up on the beach during our easterlies. During our explorations last weekend Marcella ran across a colony of goose barnacles that had washed up as well:

They’re attached to an orange substrate that reminds me of a sponge, but I know next to nothing about poriferans, so I can’t get much further with that (I had thought it was an agglomeration of red sponge, Haliclona rubens, but the color is wrong and they’re usually more fingerlike than clumpy).

But there are other, more readily identifiable organisms [...]