Barnacle Barnacle A barnacle is a type of arthropod constituting the infraclass Cirripedia in the subphylum Crustacea, and is hence related to crabs and lobsters. Barnacles are exclusively marine, and tend to live in shallow and tidal waters, typically in erosive settings. They are sessile (nonmotile) suspension feeders, and have two nektonic (active swimming) larval stages. Around 1,220 barnacle species are currently known. The name "Cirripedia" is Latin, meaning "curl-footed". The study of barnacles is called cirripedology. Barnacles are encrusters, attaching themselves permanently to a hard substrate. The most common, "acorn barnacles" (Sessilia), are sessile, growing their shells directly onto the
Nora Barnacle which gives her first name as "Norah", is dated 22 March. Her father, Thomas Barnacle, a baker in Connemara, was an illiterate man who was 38 years old when she was born. Her mother, Annie Honoria Healy, was 28 and worked as a dressmaker. Between 1886 and 1889, Barnacle's parents sent her to live with her maternal grandmother, Catherine Mortimer Healy. During these years, she began studies at a convent, eventually graduating from a national school in 1891. In 1896, Barnacle completed her schooling and began to work as a porteress and laundress. In the same year, her mother threw