Cirripedia
Cirripedia , noun, plural
[New Latin, from Latin cirrus curl + pes, pedis, foot.]
(Zoology) An order of Crustacea including the barnacles. When adult, they have a calcareous shell composed of several pieces. From the opening of the shell the animal throws out a group of curved legs, looking like a delicate curl, whence the name of the group. See Anatifa.