Species of sponge with fused spicules forming structures like thorns. Out of the water, this animal disintegrates easily, which requires extreme care in handling.

Species of sponge with fused spicules forming structures like thorns. Out of the water, this animal disintegrates easily, which requires extreme care in handling.

A relatively common sponge in shaded substrates.

Rocky intertidal snail.

A relatively common sponge in shaded substrates.