Abstract
A new species of coral-inhabiting barnacle, Trevathana paulayi, is described from Guam, the southernmost of the Mariana Islands. This new species is distinguished from Trevathana dentata (Darwin), formerly called Savignium dentatum, by the color of the wall, the lack of an occludent ledge on the scutum, and the shape of the tergum. The definition of the genus Trevathana is emended to accommodate this new species and also to include Savignium orientale Ren.
