We are fortunate that the little goby posed for us on this keyhole limpet. These limpets include seaweeds and colonial tunicates in their diet. Coastal Indians used the shells of these and other limpets as wampum. Subclass Prosobranchia.
This bryozoan is a well known fouling organism on boats and in harbors. The zooids entrap organic particles with their extended lophophores; they brood ova in their translucent, globular ovicells.
These skittish little worms will instantaneously retract their gill plumes into a calcareous tube following a shadow or other disturbance. The funnel-shaped operculum then blocks the tube's entrance. Gill plumes about 10 mm. Depth 10m.