1) Class 2) Subclass cirripedia 
• (n. pl.) 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.
Cir`ri·pe'di·a 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 ...
Cirripedia is the Cirrepedes subclass of crustacea. These are the barnacles and acorn shells. They are sedentary animals with a reduced head and abdomen. The most striking appendages are usually the six pairs of biramous thoracic feet, which are used in catching food, being swept through the water after the fashion of a fishing net. They are crusta...
[n] - barnacles
subclass Cirripedia noun barnacles