A close-up of the Sea mat Membranipora membranacea taken with my olloclip macrolens for the iPhone. This Bryozoan forms colonies on flat seaweeds. Each rectangular chamber (cuticle) houses an individual zooid. Each zoid feeds on plankton using a lophophore, a group of ciliated tentacles. Zoids differentiate into specialized types, for feeding, cleaning the colony surface or as brood chambers for embryos.
A close-up of the Hairy sea mat Electra pilosa, a species very common under rocks: