The Collaborative International Dictionary
goose barnacle
Lepas \Le"pas\ (l[=e]"p[a^]s), n. [L., a limpet, fr. Gr. lepa`s.] (Zo["o]l.) Any one of various species of Lepas, a genus of pedunculated barnacles found attached to floating timber, bottoms of ships, Gulf weed, etc.; -- called also goose barnacle. See Barnacle.
WordNet
goose barnacle
n. stalked barnacle that attaches to ship bottoms or floating timbers [syn: gooseneck barnacle, Lepas fascicularis]
Wikipedia
Goose barnacle
Goose barnacles (order Pedunculata), also called stalked barnacles or gooseneck barnacles, are filter-feeding crustaceans that live attached to hard surfaces of rocks and flotsam in the ocean intertidal zone.