From the Hubble Deep Field catalog recently presented by Driver et al., we derive the local (0.3<z<0.5) bivariate brightness distribution of field galaxies within a 326 Mpc3 volume-limited sample. The sample contains 47 galaxies which uniformly sample the underlying galaxy population within the specified redshift, magnitude, and surface brightness limits (0.3<z<0.5, -21.3<MB<-13.7 mag, 18.0<µB<...