Gallamite

Gallamites are a sapient spacefaring species with a peculiar appearance. They have transparent skulls, with a brain twice the size of a Trill's or a Bajoran's brain, and toothy smiles.

Appearances

 * Star Trek: Deep Space Nine
 * s02e20, "The Maquis, Part I" (1994)
 * s05e07, "Let He Who Is Without Sin..." (1996)
 * s06e08, "Resurrection" (1997)
 * s07e17, "Penumbra" (1999)