Inside the carapace, the animal lies on its stomach, with its limbs projecting downwards. Segmentation is usually indistinct, and the body is more or less evenly divided between the head and thorax, with little, if any, abdomen. Adult barnacles have few appendages on their heads, with only a single, vestigial pair of antennae, attached to the cement gland. The eight pairs of thoracic limbs are referred to as "cirre", which are feathery and very long, being used to filter food, such as plankton, from the water and move it towards the mouth.