A species whose skulls are transparent, leaving their unusually large brains visible, best known through Captain Boday, a sometime companion of Jadzia Dax who is never seen.
The Gallamites are a species whose most striking feature is a transparent skull. Their brains, which can be seen through it, are said to be about twice the size of a human brain. No Gallamite appears on screen in Deep Space Nine.
They are first mentioned in The Maquis, Part I, when Jadzia Dax tells a rather startled Kira that she is having dinner with Captain Boday, a Gallamite. Dax, with several lifetimes behind her, sees nothing off-putting in his appearance.
Boday becomes a running joke. Worf's jealousy of him surfaces in Let He Who Is Without Sin..., and Ezri Dax brings him up again in the final season, by which time the captain has become shorthand for Dax's adventurous tastes.